نتایج جستجو برای: upper permian
تعداد نتایج: 207735 فیلتر نتایج به سال:
Coalsack Bluff was the first discovery site in Antarctica for the latest Permian to earliest Triassic reptile Lystrosaurus. This together with discovery of Permian Glossopteris leaves during the heroic age of Antarctic exploration, indicated not only that Antarctica was part of Gondwanaland, but also that Antarctic rocks recorded faunas from the greatest of all mass extinctions at the Permian–T...
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In this paper, factors controlling natural gas accumulation in the southern margin of Junggar Basin were mainly discussed by a comparison with generation and Kuqa Depression Tarim Basin. The are located on north south sides Tianshan Mountains respectively, they share similar sedimentary stratigraphy tectonic evolution history. recent several decades, many large fields have been found Basin, but...
The end-Permian mass extinction was the most severe biotic crisis in Earth’s history. In its direct aftermath, microbial communities were abundant on shallow-marine shelves around Tethys. They colonized space left vacant after dramatic decline of skeletal metazoans. presence sponges and sponge bioherms has largely gone unnoticed due to sponges’ size cryptic method preservation. addition dominat...
Thermochemical sulfate reduction (TSR) commonly occurred in the dolostone reservoirs of Upper Permian Changxing Formation (P3c) Yuanba (YB) gas field, Sichuan Basin, yet controversy remains regarding source required for TSR. To trace sulfate, sulfur and strontium isotopic compositions were measured three diagenetic celestite (SrSO4) samples found P3c YB field. In addition, Carbonate-associated ...
The NE Hungarian Darnó Hill is geologically complex; it is composed of an accretionary mélange complex, which contains Permian, Triassic and Jurassic sedimentary and magmatic blocks. The succession can easily be correlated with the NW Dinarides, using evidences of the different evolutionary stages of the Neotethyan Ocean (rifting, marginal basin opening, closure). Several ore indications are kn...
Abdominal scales of a juvenile specimen of Australerpeton cosgriffi Barberena 1998 are made of primary compact bone rich in osteocyte lacunae; vascular canals and primary osteons are rare with no sign of remodelling of the tissue by resorption and redeposition. In contrast, the abdominal scales of an adult of the same species shows extensive reworking of the bone tissue. The scale grows by appo...
High-resolution carbon isotope measurements of multiple stratigraphic sections in south China demonstrate that the pronounced carbon isotopic excursion at the Permian-Triassic boundary was not an isolated event but the first in a series of large fluctuations that continued throughout the Early Triassic before ending abruptly early in the Middle Triassic. The unusual behavior of the carbon cycle...
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