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all geography including DSDP/ODP Sites and Legs
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Asia
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Oman (1)
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Atlantic Ocean
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Caledonides (5)
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Prince Edward Island (2)
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Ontario
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Norumbega fault zone (3)
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Oxford County Maine (2)
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Penobscot Bay (2)
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Sagadahoc County Maine (3)
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Maryland (1)
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Franklin County Massachusetts (3)
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Suffolk County Massachusetts
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New England (36)
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Susquehanna River (1)
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Texas
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Virginia (1)
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White Mountains (3)
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mineral deposits, genesis (13)
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elements, isotopes
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carbon
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C-13/C-12 (7)
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C-14 (2)
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chemical ratios (1)
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hydrogen
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deuterium (1)
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isotope ratios (27)
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isotopes
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radioactive isotopes
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C-14 (2)
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Pb-206/Pb-204 (6)
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Pb-208/Pb-204 (5)
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stable isotopes
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Hf-177/Hf-176 (1)
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Nd-144/Nd-143 (14)
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O-18/O-16 (10)
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Pb-206/Pb-204 (6)
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Pb-207/Pb-204 (4)
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Pb-207/Pb-206 (1)
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Pb-208/Pb-204 (5)
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S-34/S-32 (2)
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Sm-147/Nd-144 (6)
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Sr-87/Sr-86 (7)
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metals
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actinides
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uranium (1)
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alkali metals
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potassium (1)
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rubidium (1)
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alkaline earth metals
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barium (1)
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strontium
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Sr-87/Sr-86 (7)
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aluminum (1)
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hafnium
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Hf-177/Hf-176 (1)
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iron (2)
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lead
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Pb-206/Pb-204 (6)
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Pb-207/Pb-204 (4)
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Pb-207/Pb-206 (1)
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Pb-208/Pb-204 (5)
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niobium (1)
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platinum group (1)
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precious metals (1)
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rare earths
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lanthanum (1)
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neodymium
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Nd-144/Nd-143 (14)
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Sm-147/Nd-144 (6)
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samarium
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Sm-147/Nd-144 (6)
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titanium (3)
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zirconium (1)
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oxygen
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O-18/O-16 (10)
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phosphorus (1)
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sulfur
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S-34/S-32 (2)
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fossils
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bacteria (1)
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Chordata
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Vertebrata
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Tetrapoda (1)
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Graptolithina
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Graptoloidea (2)
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Invertebrata
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Archaeocyatha (1)
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Arthropoda
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Trilobitomorpha
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Trilobita (4)
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Brachiopoda (2)
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Mollusca (1)
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microfossils
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Chitinozoa (2)
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Conodonta (4)
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palynomorphs
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Chitinozoa (2)
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Plantae (1)
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thallophytes (1)
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tracks (1)
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geochronology methods
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(U-Th)/He (2)
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Ar/Ar (28)
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fission-track dating (4)
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K/Ar (3)
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paleomagnetism (13)
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Pb/Pb (4)
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Pb/Th (2)
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Rb/Sr (5)
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Re/Os (1)
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Sm/Nd (3)
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thermochronology (4)
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U/Pb (66)
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U/Th/Pb (1)
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geologic age
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Cenozoic
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Quaternary
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Holocene
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upper Holocene (1)
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Pleistocene
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upper Pleistocene
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Weichselian
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upper Weichselian
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Younger Dryas (1)
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Wisconsinan (1)
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-
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upper Quaternary (1)
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Dalradian (2)
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Mesozoic
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Cretaceous
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Upper Cretaceous (1)
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Jurassic (4)
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Triassic
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Upper Triassic (2)
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upper Mesozoic (1)
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Paleozoic
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Cambrian
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Acadian (2)
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Lower Cambrian
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Pinney Hollow Formation (1)
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Middle Cambrian (1)
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Upper Cambrian
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Goldenville Formation (1)
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Steptoean (2)
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-
-
Carboniferous
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Lower Carboniferous
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Dinantian (1)
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Mississippian
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Middle Mississippian
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Visean (1)
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Namurian (1)
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Pennsylvanian
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Pittsburgh Coal (1)
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Upper Carboniferous (3)
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Casco Bay Group (1)
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Cow Head Group (1)
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Devonian
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Lower Devonian
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Emsian (3)
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Littleton Formation (1)
-
-
Middle Devonian
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Eifelian (1)
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Onondaga Limestone (2)
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Tioga Bentonite (1)
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-
Upper Devonian (8)
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-
Ellis Bay Formation (1)
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Helderberg Group (1)
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Horton Group (2)
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lower Paleozoic (17)
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Matapedia Group (1)
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middle Paleozoic (4)
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Ordovician
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Buchans Group (1)
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Lower Ordovician
-
Arenigian (5)
-
Beekmantown Group (3)
-
Tremadocian
-
Halifax Formation (1)
-
-
-
Meguma Group (3)
-
Middle Ordovician
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Ammonoosuc Volcanics (1)
-
Cloridorme Formation (1)
-
Darriwilian (2)
-
Llanvirnian (2)
-
Table Head Group (1)
-
-
Tetagouche Group (6)
-
Upper Ordovician
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Ashgillian (1)
-
Katian (1)
-
Sandbian (1)
-
-
Wild Bight Group (1)
-
-
Permian (37)
-
Rangeley Formation (1)
-
Sauk Sequence (2)
-
Silurian
-
Lower Silurian
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Wenlock (1)
-
-
Middle Silurian
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Rochester Formation (1)
-
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Perry Mountain Formation (1)
-
Upper Silurian (6)
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Tippecanoe Sequence (1)
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upper Paleozoic (10)
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Phanerozoic (1)
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Precambrian
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Adirondack Anorthosite (1)
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Archean (3)
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Baltimore Gneiss (1)
-
upper Precambrian
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Proterozoic
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Dedham Granodiorite (2)
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Mesoproterozoic
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Fordham Gneiss (1)
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Neoproterozoic
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Ediacaran (4)
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Moine Supergroup (2)
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Paleoproterozoic (1)
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igneous rocks
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igneous rocks
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plutonic rocks
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anorthosite (1)
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diabase (4)
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plagiogranite (2)
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gabbros
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norite (2)
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troctolite (1)
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granites
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adamellite (1)
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aplite (1)
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A-type granites (3)
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felsite (2)
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I-type granites (1)
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leucogranite (1)
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monzogranite (1)
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rapakivi (1)
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two-mica granite (1)
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granodiorites (4)
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lamprophyres (1)
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pegmatite (4)
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syenites (3)
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ultramafics
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chromitite (1)
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peridotites
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dunite (1)
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harzburgite (1)
-
-
-
-
volcanic rocks
-
andesites
-
boninite (2)
-
-
basalts
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mid-ocean ridge basalts (1)
-
tholeiite (4)
-
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basanite (1)
-
pyroclastics
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ignimbrite (1)
-
tuff (4)
-
-
rhyodacites (1)
-
rhyolites (8)
-
-
-
ophiolite (14)
-
-
metamorphic rocks
-
K-bentonite (1)
-
metabentonite (5)
-
metamorphic rocks
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amphibolites (1)
-
gneisses
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biotite gneiss (1)
-
granite gneiss (4)
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orthogneiss (1)
-
paragneiss (2)
-
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granulites (2)
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hornfels (1)
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marbles
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ophicalcite (1)
-
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metaigneous rocks
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meta-andesite (1)
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metabasalt (2)
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metagabbro (1)
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metatuff (1)
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serpentinite (1)
-
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metaplutonic rocks (2)
-
metasedimentary rocks
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metaconglomerate (2)
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metapelite (1)
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paragneiss (2)
-
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metasomatic rocks
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greisen (1)
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serpentinite (1)
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skarn (1)
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metavolcanic rocks (13)
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migmatites (4)
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mylonites (9)
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phyllites (2)
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phyllonites (1)
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quartzites (2)
-
schists
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blueschist (4)
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greenstone (2)
-
-
-
ophiolite (14)
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turbidite (7)
-
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minerals
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arsenides (1)
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carbonates (1)
-
halides
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fluorides
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fluorite (1)
-
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K-bentonite (1)
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metabentonite (5)
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minerals (2)
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oxides
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magnetite (1)
-
-
phosphates
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apatite (5)
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monazite (12)
-
-
silicates
-
chain silicates
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amphibole group
-
clinoamphibole
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hornblende (10)
-
-
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pyroxene group (2)
-
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framework silicates
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feldspar group
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alkali feldspar
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K-feldspar (1)
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orthoclase (1)
-
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plagioclase
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albite (1)
-
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silica minerals
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quartz (1)
-
-
-
orthosilicates
-
nesosilicates
-
garnet group
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almandine (1)
-
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kyanite (1)
-
olivine group
-
olivine (1)
-
-
titanite group
-
titanite (4)
-
-
zircon group
-
zircon (59)
-
-
-
-
sheet silicates
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chlorite group
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chlorite (2)
-
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clay minerals
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illite (2)
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mica group
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annite (1)
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biotite (8)
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glauconite (1)
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muscovite (16)
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-
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sulfates (1)
-
sulfides
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galena (2)
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sphalerite (1)
-
-
-
Primary terms
-
absolute age (98)
-
Asia
-
Arabian Peninsula
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Oman (1)
-
-
-
Atlantic Ocean
-
North Atlantic
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Bay of Fundy (2)
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Gulf of Maine (1)
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Gulf of Saint Lawrence (10)
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Northwest Atlantic (2)
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Sable Island Bank (1)
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Scotian Shelf (1)
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-
-
Atlantic region (4)
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bacteria (1)
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barite deposits (3)
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bibliography (2)
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biogeography (4)
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biography (1)
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bitumens (1)
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Canada
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Eastern Canada
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Gander Zone (19)
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Maritime Provinces
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New Brunswick
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Gloucester County New Brunswick
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Miramichi Bay (1)
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Saint George Batholith (1)
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York County New Brunswick (1)
-
-
Nova Scotia
-
Antigonish County Nova Scotia
-
Antigonish Nova Scotia (2)
-
-
Cape Breton Island
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Cape Breton Highlands (3)
-
-
Cobequid Fault (2)
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Cobequid Highlands (3)
-
Cumberland County Nova Scotia (1)
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Digby County Nova Scotia (1)
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Minas Basin (1)
-
-
Prince Edward Island (2)
-
-
Meguma Terrane (20)
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Newfoundland and Labrador
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Labrador (1)
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Newfoundland
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Avalon Peninsula (4)
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Baie Verte Peninsula (3)
-
Burin Peninsula (2)
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Burlington Peninsula (1)
-
Humber Arm Allochthon (11)
-
New World Island (1)
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Northern Appalachians
Geochemistry, U-Pb geochronology and Nd-Hf isotopes of leucocratic dykes in the Cape Spencer area, southern New Brunswick, Canada: insights into the Alleghanian orogeny in the northern Appalachians Open Access
Crustal melting recorded by dykes along the gold-bearing Melanson Brook Fault, northern New Brunswick Appalachians Available to Purchase
Late Devonian syntaxis in the Northern Appalachian orogen Available to Purchase
Abstract The pre-accretionary shapes of cratonic margins form successions of promontories and re-entrants inherited from the rifting of supercontinents. In accretionary orogens, the extent of deformation related to a collision with a continent characterized by an irregular margin is obfuscated through the partitioning of deformation along pre-existing structures. In the Northern Appalachians, the extent of the deformation related to the oblique collision of the Meguma terrane with the composite Laurentian margin is disputed. Herein, we use a framework based on modern collisional settings to investigate the Late Devonian to Mississippian deformation inboard of the Avalonia–Meguma boundary and evaluate the regional tectonic setting. We combine published shear zone kinematic interpretations, deformation ages and regional 40 Ar/ 39 Ar cooling ages with structural interpretation of aeromagnetic and gravimetric depth slices covering the Northern Appalachians. We find that the deformation related to the collision of the Meguma terrane, attributed to the Neoacadian orogeny, has a larger structural footprint than previously documented. While this deformation is partitioned in multiple structures in the Canadian Appalachians, northern New England is characterized by rapid crustal deformation, high palaeoelevation and fast erosional exhumation, similar to modern syntaxis structures.
Late Devonian shear-zone reactivation in the Canadian Appalachian orogen Open Access
Abstract Oblique accretion zones often display transpressive, strike-slip and transtensive structures of different orientations with respect to the convergence axis. The Late Devonian oblique collision of Meguma within the Canadian Appalachian orogen is often characterized as transpressive. However, the simultaneous opening of the Maritimes Basin indicates that the orogenesis also partitioned into an extensional component. In this context, few of the shear zones reactivated during this time period have been characterized while accounting for the possibility of strain partitioning. To do so, we characterize the kinematics and timing of deformation of the Eastern Highlands Shear Zone (EHSZ) and the Coinneach Brook Shear Zone (CBSZ) on Cape Breton Island, Nova Scotia, using a combination of U–Pb geochronology (zircon, monazite, xenotime and apatite) and 40 Ar/ 39 Ar geochronology in situ and step-heating experiments (amphibole, muscovite and biotite). Results show that the Silurian EHSZ was reactivated at c. 385–367 Ma and the CBSZ was formed at c. 395–369 Ma, both yielding oblique kinematics. Together, these structures accommodated the rapid exhumation of the Cape Breton Highlands during the docking of the Meguma terrane. This study thus highlights the heterogeneous distribution of transtensive and transpressive deformation during the Neoacadian Orogeny.
Late Paleozoic igneous rocks at Clarke Head, Nova Scotia: magmatism at an arc to back-arc transition Available to Purchase
Abstract This study re-examines a reported mylonitic ‘metabasic granulite’ block in a megabreccia that is the most outboard igneous rock outcrop in the Avalon terrane, near the Meguma–Avalon terrane boundary in the northern Appalachians. The block of foliated gabbro is one of several igneous rock blocks in a largely dissolved salt wall and in style of deformation, mineralogy, lithogeochemistry and Sm/Nd isotopes resembles foliated and locally mylonitized late Devonian–early Carboniferous gabbro plutons along the Cobequid Shear Zone to the north. Garnet porphyroclasts in the foliated gabbro are exceptional, with a distinctive composition of Alm 55 Pyr 25 Grs 13 And 4 Sps 3 . Inclusions of pyroxene, andesine and ilmenite, lack of zoning and corroded rims suggest the garnets are antecrysts. Elsewhere in the world, garnets of similar composition in arc-related andesites are interpreted to be from disintegration of comagmatic cumulate material at 0.8–1.0 GPa under hydrous conditions. The Clarke Head foliated gabbro has two mafic components, one resembling arc-related hydrous magma and the other with tholeiitic back-arc character, similar to coeval rocks in the Cobequid Highlands. The gabbro is a product of complex mixing in crustal magma chambers and rapid rise of magma containing lower crustal antecrysts along strike-slip faults.