Geologic and chronostratigraphic overview of the Upper Triassic and Jurassic successions of the Junggar Basin, NW China
| Autor: | Jingeng Sha, Yanan Fang, Jinhui Cheng, Yaqiong Wang, Sha Li, Xiaoju Yang, Jiahao Li, Haichun Zhang |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Geological Society, London, Special Publications. 538 |
| ISSN: | 2041-4927 0305-8719 |
| DOI: | 10.1144/sp538-2022-106 |
| Popis: | The vast, widely-exposed terrestrial (lacustrine to fluvial) Upper Triassic-Jurassic (except Tithonian), successions of the Junggar Basin, not only record most of the stratigraphic boundaries of the Upper Triassic and Jurassic, including the Triassic-Jurassic boundary (TJB), Hettangian-Sinemurian, Sinemurian-Pliensbachian, Pliensbachian-Toarcian, Lower-Middle Jurassic, Middle-Upper Jurassic, Oxfordian-Kimmeridgian boundaries, but also record a range of the geologic, organic, palaeogeographic, palaeoclimatic events, known to have happened globally in the Late Triassic and Jurassic. The TJB is placed in the stratigraphic interval of the First Occurrence (FO) of Retitriletes austroclavatidites and Callialasporites dampieri and the Last Occurrence (LO) of Lunatisporites rhaeticus . The end-Triassic mass extinction (ETE) is characterized by the disappearance of most of the sporomorph and macro-plant taxa. The ETE occurred before the FO of the sporomorph Cerebropollenites thiergartii , and ended after it when life began to revive. The Junggar Basin was situated at a high latitude during the Late Triassic-Early Jurassic Pliensbachian ‘hothouse’ and ‘greenhouse’ periods. The Late Triassic-Middle Jurassic Bajocian was humid and warm, and rich in coal swamps, except the Toarcian, which yields little coal because it was relatively warmer and drier. It became arid from the early Late Jurassic Oxfordian. |
| Databáze: | OpenAIRE |
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