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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Limpopo Belt (1)
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North Africa
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Algeria
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Great Kabylia (1)
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Maghreb (1)
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Morocco
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Tunisia (1)
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Southern Africa
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Namibia
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South Africa
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Zimbabwe (1)
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Antarctica
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Asia
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United Arab Emirates
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Far East
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China
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Atlantic Ocean
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Atlantic Ocean Islands
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Western Europe
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Pacific Ocean
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West Pacific
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Roberts Mountains (1)
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Argentina
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Brazil
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Colombia
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United States
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Alabama (2)
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Arkansas
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Ohio
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Texas
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commodities
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elements, isotopes
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hydrogen
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isotope ratios (11)
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isotopes
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stable isotopes
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Ar-40/Ar-39 (1)
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C-13/C-12 (4)
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D/H (1)
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Nd-144/Nd-143 (1)
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O-18/O-16 (2)
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Os-188/Os-187 (1)
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Rb-87/Sr-86 (1)
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S-34/S-32 (1)
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large-ion lithophile elements (1)
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Lu/Hf (1)
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metals
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actinides
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uranium
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U-238/Pb-206 (1)
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alkali metals
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rubidium
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Rb-87/Sr-86 (1)
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alkaline earth metals
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strontium
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Rb-87/Sr-86 (1)
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Sr-87/Sr-86 (3)
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lead
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U-238/Pb-206 (1)
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platinum group
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osmium
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Os-188/Os-187 (1)
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rare earths
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neodymium
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Nd-144/Nd-143 (1)
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Sm-147/Nd-144 (1)
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samarium
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Sm-147/Nd-144 (1)
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yttrium (1)
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rhenium (1)
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noble gases
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argon
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Ar-40/Ar-39 (1)
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oxygen
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O-18/O-16 (2)
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sulfur
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S-34/S-32 (1)
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fossils
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burrows (1)
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Chordata
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Vertebrata
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Pisces
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Osteichthyes
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Tetrapoda
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Mammalia
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Theria
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Pinnipedia (1)
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Perissodactyla (1)
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Reptilia
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Diapsida
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Archosauria
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Graptolithina (3)
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Invertebrata
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Podocopida
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Brachiopoda
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Articulata
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Echinodermata
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Mollusca
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Cephalopoda
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Goniatitida
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Gastropoda
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Porifera
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Protista
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Rotaliina
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Rotalipora (2)
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Radiolaria (3)
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Thecamoeba (1)
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Metazoa (1)
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microfossils
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Chitinozoa (2)
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palynomorphs
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Plantae
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geochronology methods
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Ar/Ar (7)
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geologic age
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Cenozoic
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upper Quaternary
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Tertiary
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upper Paleocene (1)
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Mesozoic
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Cretaceous
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lower Aptian (1)
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Middle Cretaceous (2)
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Arab Formation (2)
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Triassic
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Permian-Triassic boundary (1)
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Middle Triassic
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Doig Formation (2)
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Montney Formation (2)
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Paleozoic
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Acatlan Complex (1)
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Upper Cambrian (2)
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-
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Upper Mississippian
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Meramecian (2)
-
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Pennsylvanian
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Upper Carboniferous (1)
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Devonian
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Lower Devonian (5)
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Middle Devonian
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Detroit River Group (1)
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Onondaga Limestone (1)
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Upper Devonian
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Hanson Creek Formation (1)
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lower Paleozoic (1)
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Ordovician
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Lower Ordovician
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Kope Formation (3)
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Vinini Formation (1)
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Permian
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Americus Limestone Member (1)
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Upper Permian
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Lopingian
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Permian-Triassic boundary (1)
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Silurian
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Lower Silurian
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Llandovery (2)
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upper Precambrian
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Tapley Hill Formation (1)
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igneous rocks
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igneous rocks
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kimberlite (1)
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volcanic rocks
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pyroclastics
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ophiolite (3)
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metamorphic rocks
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eclogite (1)
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metasomatic rocks
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Primary terms
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Invertebrata
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Trilobitomorpha
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Brachiopoda
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Mollusca
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Goniatitida
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Gastropoda
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Porifera
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Protista
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Mesozoic
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Jurassic
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Triassic
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Montney Formation (2)
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metals
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lead
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North America
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Ocean Drilling Program
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Pacific Ocean
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Paleozoic
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Upper Carboniferous (1)
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Devonian
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Hanson Creek Formation (1)
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Vinini Formation (1)
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Permian
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Americus Limestone Member (1)
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Permian-Triassic boundary (1)
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Silurian
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Llandovery (2)
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diachronism
Discussion of Searle, ‘Tectonic evolution of the Caledonian orogeny in Scotland: a review based on the timing of magmatism, metamorphism and deformation’
Syn-rift Cretaceous deformation in the Agly Variscan Massif (Eastern Pyrenees, France)
ABSTRACT The supercontinent of Pangea formed through the diachronous collision of Laurussia and Gondwana during the late Paleozoic. While magmatism associated with its formation is well documented in the Variscan orogeny of Europe and Alleghanian orogeny of the United States, little is known about the Sonora orogeny of northern Mexico. This paper reports geochronology (U-Pb zircon), whole-rock geochemistry, and Lu-Hf zircon isotope data on basement cores from the western Gulf of Mexico, which were used to develop a tectonomagmatic model for pre- to post-Pangea amalgamation. Our results suggest the existence of three distinct phases of magmatism, produced during different stages of continental assembly and disassembly. The first phase consists of Early Permian (294–274 Ma; n = 3) granitoids with geochemical signatures indicative of a continental arc tectonic setting. This phase formed on the margins of Gondwana during the closure of the Rheic Ocean, prior to the final amalgamation of Pangea. It likely represents a lateral analogue of late Carboniferous–Early Permian granitoids that intrude the Acatlán and Oaxacan Complexes. The second phase of magmatism includes Late Permian–Early Triassic (263–243 Ma; n = 13) granitoids with suprasubduction geochemical affinities. However, Lu-Hf isotope data indicate that these granitoids formed from crustal anatexis, with ε Hf values and two-step Hf depleted mantle model ages (T DM[Hf] ) comparable to the Oaxaquia continental crust into which they intrude. This phase of magmatism is likely related to coeval granitoids in the Oaxaca area and Chiapas Massif. We interpret it to reflect late- to postcollisional magmatism along the margin of Gondwana following the assembly of Pangea. Finally, the third phase of magmatism includes Early–Middle Jurassic (189–164 Ma; n = 2) mafic porphyries, which could be related to the synchronous suprasubduction magmatism associated with the Nazas arc. Overall, our results are consistent with Pangea assembly through diachronous collision of Laurussia and Gondwana during subduction of the Rheic Ocean. They suggest that postorogenic magmatism in the western termination of the Rheic suture occurred under the influence of a Panthalassan subduction zone, before opening of the Gulf of Mexico.
A Lower Devonian age for the Corvock Granite and its significance for the structural history of South Mayo and the Laurentian margin of western Ireland
Petrogenesis of Early Paleozoic high Sr/Y intrusive rocks from the North Qilian orogen: Implication for diachronous continental collision
Composite and diachronous stratigraphic surfaces in low-gradient, transitional settings: The J-3 “unconformity” and the Curtis Formation, east-central Utah, U.S.A.
ABSTRACT Facies analysis utilizing a conodont biostratigraphic framework is a powerful tool for evaluating genetic relationships of Osagean–basal Meramecian strata within the Ozark region (Arkansas–Missouri–Oklahoma) of the southern midcontinent. This investigation builds upon previous work cited herein, and suggests that some lithostratigraphic divisions, although useful in differentia