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NARROW
GeoRef Subject
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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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Invertebrata
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geologic age
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Cenozoic
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Mesozoic
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upper Mesozoic (1)
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Paleozoic
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Carboniferous
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Cow Head Group (1)
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Onondaga Limestone (2)
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Upper Devonian (6)
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Ellis Bay Formation (1)
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lower Paleozoic (16)
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middle Paleozoic (4)
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Ordovician
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Lower Ordovician
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Meguma Group (3)
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Tetagouche Group (6)
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Upper Ordovician
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Wild Bight Group (1)
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Permian (35)
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Sauk Sequence (2)
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Middle Silurian
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Rochester Formation (1)
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Perry Mountain Formation (1)
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Tippecanoe Sequence (1)
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upper Paleozoic (8)
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Phanerozoic (1)
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Precambrian
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upper Precambrian
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Neoproterozoic
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Ediacaran (4)
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Paleoproterozoic (1)
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igneous rocks
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plutonic rocks
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plagiogranite (2)
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gabbros
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norite (2)
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granites
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A-type granites (3)
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felsite (2)
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monzogranite (1)
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granodiorites (3)
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volcanic rocks
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basalts
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mid-ocean ridge basalts (1)
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tholeiite (4)
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pyroclastics
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tuff (4)
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rhyodacites (1)
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ophiolite (14)
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metamorphic rocks
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K-bentonite (1)
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metabentonite (5)
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metamorphic rocks
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amphibolites (1)
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gneisses
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granite gneiss (4)
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paragneiss (2)
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granulites (2)
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hornfels (1)
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marbles
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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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metaplutonic rocks (2)
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metasedimentary rocks
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metasomatic rocks
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greisen (1)
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serpentinite (1)
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metavolcanic rocks (12)
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mylonites (9)
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schists
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blueschist (4)
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ophiolite (14)
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turbidite (7)
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minerals
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halides
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fluorides
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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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phosphates
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apatite (5)
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monazite (9)
-
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silicates
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chain silicates
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amphibole group
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clinoamphibole
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hornblende (9)
-
-
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pyroxene group (2)
-
-
framework silicates
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feldspar group
-
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
-
quartz (1)
-
-
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orthosilicates
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nesosilicates
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garnet group
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almandine (1)
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kyanite (1)
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olivine group
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olivine (1)
-
-
titanite group
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titanite (4)
-
-
zircon group
-
zircon (52)
-
-
-
-
sheet silicates
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chlorite group
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chlorite (2)
-
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clay minerals
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smectite (1)
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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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phlogopite (1)
-
-
-
-
sulfates (1)
-
sulfides
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galena (2)
-
sphalerite (1)
-
-
-
Primary terms
-
absolute age (90)
-
Asia
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Arabian Peninsula
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Oman (1)
-
-
-
Atlantic Ocean
-
North Atlantic
-
Bay of Fundy (2)
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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)
-
-
-
Atlantic region (3)
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bacteria (1)
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barite deposits (3)
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bibliography (2)
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biogeography (3)
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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 (18)
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Maritime Provinces
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New Brunswick
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Miramichi Bay (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)
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Cobequid Fault (2)
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Cobequid Highlands (2)
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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)
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Meguma Terrane (15)
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Newfoundland and Labrador
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Avalon Peninsula (4)
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-
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Ontario
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Quebec
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Beauce County Quebec (2)
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Charlevoix (1)
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Gaspe Peninsula (29)
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Kamouraska County Quebec (2)
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Levis County Quebec (1)
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L'Islet County Quebec (1)
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Monteregian Hills (3)
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Quebec City Quebec (2)
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Saint Lawrence Estuary (1)
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Sherbrooke County Quebec (1)
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Thetford Mines (3)
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Elzevir Terrane (1)
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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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Caribbean region
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Northern Appalachians
Newly recognized blueschist-facies metamorphism (glaucophane-omphacite-garnet), Belvidere Mountain Complex, northern Appalachians
Petrogenesis of arsenic and platinum-group minerals from a partially serpentinized dunite in East Dover, Vermont, USA
Discussion of “The northern Appalachian terrane wreck model”
Reply to the discussion by van Staal et al. on “The northern Appalachian terrane wreck model”
The northern Appalachian terrane wreck model
Paleozoic evolution of crustal thickness and elevation in the northern Appalachian orogen, USA
Age and tectonic setting of Neoproterozoic granitoid rocks, Antigonish Highlands, Nova Scotia, Canada: implications for Avalonia in the northern Appalachian orogen
Detrital zircon populations of the eastern Laurentian margin in the Appalachians
Zircon and monazite geochronology in the Palmer zone of transpression, south-central New England, USA: Constraints on timing of deformation, high-grade metamorphism, and lithospheric foundering during late Paleozoic oblique collision in the Northern Appalachian orogen
A Laurentian margin subduction perspective: Geodynamic constraints from phase equilibria modeling of barroisite greenstones, northern USA Appalachians
Late Ottawan orogenic collapse of the Adirondacks in the Grenville province of New York State (USA): Integrated petrologic, geochronologic, and structural analysis of the Diana Complex in the southern Carthage-Colton mylonite zone
Earthquake Magnitude and Lg Q Variations between the Grenville and Northern Appalachian Geologic Provinces of Eastern Canada
Derivation of the Early Carboniferous Wedgeport pluton by crystal fractionation of a mafic parental magma: a rare case of an A-type granite within the Meguma terrane (Nova Scotia, Canada)
New U–Pb age constraints on the geological history of the Ganderian Bras d’Or terrane, Cape Breton Island, Nova Scotia
Platform drowning leading to cool-water carbonate deposition: evolution of a Late Ordovician (Turinian–Chatfieldian) mixed-sediment platform within the Taconic orogen (Long Point Group, Newfoundland Appalachians)
Seismic evidence for a recently formed mantle upwelling beneath New England
ABSTRACT The Berkshire massif in western Massachusetts is one of several external basement massifs in the New England Appalachians. The Day Mountain thrust is a segment of the western frontal thrust of the Berkshire massif that carried Mesoproterozoic basement gneisses and unconformably overlying cover rocks of the Neoproterozoic (?) Dalton Formation and Cambrian Cheshire Quartzite over the Cambrian to Ordovician Stockbridge Formation. The basal unit of the Dalton Formation is a distinctive deformed quartz-pebble conglomerate. We made 27 strain estimates at 18 locations using the deformed conglomerate to investigate the strain field in the Day Mountain thrust sheet and test the plane-strain model of thrust emplacement. Although the strain ellipsoids vary from prolate to oblate shapes over distances as small as 200 m, and the orientations of the principal directions of strain range widely, a remarkably simple strain pattern, broadly consistent with simple shear, emerges when the strain data are plotted on contoured stereograms. The preferred orientation of the maximum elongation direction plunges gently and approximately coincides with the west-northwest transport direction of the thrust sheet, the preferred orientation of the intermediate principal strain axis is nearly horizontal and perpendicular to the transport direction, and the preferred orientation of the short axis plunges steeply. Most of the strain ellipsoids fall in the prolate field, which is indicative of constrictive flow, especially in the northern part of the thrust sheet. We suggest that the steep gradients in three-dimensional strain type were caused by flow of the more ductile conglomerate over an irregular surface of relatively rigid basement rocks, which were little affected by Paleozoic deformation. The constrictive flow conditions that dominate the strain field in the northern part of the thrust sheet may reflect the irregular paleotopography of the unconformity surface and/or a lateral ramp oriented at an oblique angle to the transport direction that impeded west-northwest–directed thrusting.