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| Triassic geology | |
|---|---|
| Name | Triassic |
| Period | Triassic |
| Time start | 251.902 |
| Time end | 201.36 |
| Color | #ff7f50 |
| Caption | Triassic-aged strata and fossils |
Triassic geology The Triassic Period saw profound changes in Pangea, widespread mass extinction aftermath, and the reorganization of Earth's biosphere and lithosphere. Stratigraphic subdivisions and global correlations were established through work by institutions such as the International Commission on Stratigraphy and researchers from the United States Geological Survey, British Geological Survey, and Geological Survey of Canada. Key regional studies in the Germanic Basin, Newark Basin, Karoo Basin, Gondwana, and Tethys Ocean underpin modern chronostratigraphic frameworks.
Triassic chronostratigraphy is anchored by type sections like the Hettangian-equivalent sequences and global standards ratified by the International Commission on Stratigraphy, with subdivisions defined as the Lower Triassic, Middle Triassic, and Upper Triassic. Biostratigraphic markers include occurrences of index taxa tied to formations such as the Sinemurian-age successions and the Rhaetian stage exposures in the Alps, British Isles, and Marlborough Region. Magnetostratigraphy correlated by teams at the University of Cambridge, ETH Zurich, and California Institute of Technology enables links between the Newark Supergroup basins of North America, the Karoo Basin of South Africa, and the Sydney Basin in Australia.
Triassic tectonics reflect rifting and incipient breakup of Pangea with orogenic reactivation along margins such as the Variscan Belt, Alleghenian orogeny, and Gondwanide Orogeny. Plate reconstructions by groups at the Smithsonian Institution, Netherlands Organisation for Scientific Research, and Max Planck Society connect rift basins like the Central Atlantic Magmatic Province margins, the Tethyan realm, and the evolving Pacific Plate margin architecture. Continental collision zones influenced sediment routing into basins such as the Neuquén Basin, Lachlan Fold Belt, and Andean foreland basins, documented in papers from the Geological Society of America, European Geosciences Union, and American Geophysical Union conferences.
Triassic sedimentation includes continental redbeds, evaporites, fluvial conglomerates, and shallow-marine limestones preserved in the Newark Basin, Germanic Basin, Zechstein Sea, and Tethys Ocean margins. Studies by researchers at the University of Oxford, University of California, Berkeley, and Chinese Academy of Sciences show facies transitions between the Karoo Basin fluvial systems, the Monegros Basin coastal shelves, and the Weddell Sea-adjacent deposits in Antarctica. Sequence stratigraphy tied to global sea-level curves by teams from the University of Texas at Austin and National Oceanography Centre refines correlations between continental rift sequences and passive margin successions in the North Sea and Mediterranean Basin.
Triassic magmatism is exemplified by emplacement of the Central Atlantic Magmatic Province, which is linked to flood basalts studied by the Geological Survey of Brazil, Geological Survey of India, and Instituto Geológico y Minero de España. Intrusive events and alkaline volcanism in the Siberian Traps-prelude contexts, as analyzed by teams at the Russian Academy of Sciences, the University of Edinburgh, and GFZ German Research Centre for Geosciences, influenced climate and basin geochemistry. Geochronology using U–Pb dating methods by laboratories at Lamont–Doherty Earth Observatory and University of Melbourne constrain eruption timings and the synchroneity of magmatic provinces across the Pangean margin.
Triassic paleoclimate reconstructions integrate data from the Greenhouse Earth intervals, monsoonal regimes over Pangea, and high-latitude evidence from Antarctica and the Svalbard archipelago. Isotope geochemistry work by the Max Planck Institute for Chemistry, Pennsylvania State University, and Maine Geological Survey uses oxygen and carbon isotopes to track carbon cycle perturbations, while paleobotanical assemblages documented by the Royal Botanic Gardens, Kew and Smithsonian Institution inform terrestrial humidity gradients. Eustatic sea-level curves published in reports from the Intergovernmental Oceanographic Commission and International Association of Sedimentologists reconcile transgressive–regressive cycles recorded in the Peri-Tethys shelves and the Western Interior Seaway precursors.
Post-extinction recovery during the Triassic is traced through vertebrate, invertebrate, and plant assemblages cataloged in collections at the Natural History Museum, London, American Museum of Natural History, and Museo Geológico José Bonaparte. Fossil Lagerstätten such as the Müntschemier, Ischigualasto Formation, and Guanling Formation yield early dinosaurs, synapsids, and marine reptiles whose taxonomic work appears in journals affiliated with the Paleontological Society, Royal Society and Chinese Academy of Sciences. Biogeographic patterns linking faunas across Laurasia and Gondwana were modeled by teams at the University of Chicago, Monash University, and Instituto de Geología (UNAM).
Triassic sequences host hydrocarbon reservoirs in the North Sea, Gulf of Mexico-adjacent rift basins, and the Neuquén Basin exploited by companies such as Shell plc, BP, and Chevron Corporation. Evaporite deposits mined for potash and salts in the Zechstein Formation and Permian–Triassic basins support industries documented by the International Potash Institute and US Bureau of Land Management. Mineralization associated with Triassic magmatism yields resources in the Kola Peninsula, Saxony tin–tungsten provinces, and orogenic gold in the Andes, with exploration guided by standards from the Society of Economic Geologists and International Council on Mining and Metals.
Category:Geologic periods Category:Mesozoic Era