西藏南羌塘盆地中三叠世座倾错组放射虫动物群及其地层学意义

李亚; 纪占胜; 武桂春; 姚建新; 王玉净

doi:10.3799/dqkx.2018.292

Volume 43 Issue 11

Nov. 2018

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Li Ya, Ji Zhansheng, Wu Guichun, Yao Jianxin, Wang Yujing, 2018. Radiolarian Fauna from Middle Triassic of Zuoqingcuo Formation, Southern Qiangtang Basin, Xizang, China, and Its Stratigraphic Significance. Earth Science, 43(11): 3932-3946. doi: 10.3799/dqkx.2018.292

Citation:

Li Ya, Ji Zhansheng, Wu Guichun, Yao Jianxin, Wang Yujing, 2018. Radiolarian Fauna from Middle Triassic of Zuoqingcuo Formation, Southern Qiangtang Basin, Xizang, China, and Its Stratigraphic Significance. Earth Science, 43(11): 3932-3946. doi: 10.3799/dqkx.2018.292

Citation:

Li Ya, Ji Zhansheng, Wu Guichun, Yao Jianxin, Wang Yujing, 2018. Radiolarian Fauna from Middle Triassic of Zuoqingcuo Formation, Southern Qiangtang Basin, Xizang, China, and Its Stratigraphic Significance. Earth Science, 43(11): 3932-3946. doi: 10.3799/dqkx.2018.292

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Radiolarian Fauna from Middle Triassic of Zuoqingcuo Formation, Southern Qiangtang Basin, Xizang, China, and Its Stratigraphic Significance

doi: 10.3799/dqkx.2018.292

Li Ya^{1,2
,},
Ji Zhansheng^{3
,
,},
Wu Guichun¹,
Yao Jianxin¹,
Wang Yujing²

1.
Key Laboratory of Stratigraphy and Paleontology, Ministry of Land and Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
2.
Key Laboratory of Economic Stratigraphy and Palaeogeography, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China
3.
Chinese Academy of Geological Sciences, Beijing 100037, China

Received Date: 2018-04-17
Publish Date: 2018-11-15

Abstract

Abstract

Previous studies indicate that there are Middle Triassic strata in the southern Qiangtang basin, which has not been confirmed due to the lack of solid evidence of paleontological fossils. Here two new sections in Zuoqingcuo, Jimu Town, Gaize County, Tibet, were investigated. It is found that the sections belong to the Upper Triassic Riganpeicuo Formation according to the 1:250 000 Regional Geological Survey Report of Dinggu Area. 33 species in 18 genera of fossil radiolarians from the specimens of siliceous rocks were totally obtained and identified. The main components of the radiolarians are Cryptostephanidium longispinosum (Sashida), Eptingium manfredi Dumitrica, Falcispongus falciformis Dumitrica, Hindeosphaera spinulosa (Nakaseko et Nishimura), Muelleritortis firmum (Gorican), Oertlispongus inaequispinosus Dumitrica, Kozur et Mostler, Paroertlispongus chinensis (Feng), Paroertlispongus hermi (Lahm), Paroertlispongus weddigei Lahm, Paurinella aequispinosa Kozur et Mostler, Pseudostylosphaera coccostyla (Rüst), Pseudostylosphaera compacta (Nakaseko et Nishimura), Pseudostylosphaera gracilis Kozur et Mostler, Pseudostylosphaera japonica (Nakaseko et Nishimura), Pseudostylosphaera nazarovi (Kozur et Mostler), Pseudostylosphaera tenue Nakaseko et Nishimura), Triassocampe imitata Bragin, Triassospongosphaera triassica (Kozur et Mostler). The radiolarian assemblage indicates an age of the late Anisian-early Ladinian of Middle Triassic for the two sections. Based on the previous research and the present data, the Triassic strata in the southern Qiangtang basin are divided into (1) the Lower Triassic Zishisang Formation, indicating carbonate deposition in a stable shallow marine environment, (2) the Middle Triassic Zuoqingcuo Formation, a new formation, indicating clasolite to silicolite deposition in a deep-water (bathyal-abyssal) environment, (3) the Upper Triassic Riganpeicuo Formation and the Upper Triassic-Lower Jurassic Samenxiong Formation. Our results provide stratigraphic and paleontological evidences to understand the features and contents of the Middle Triassic in the southern Qiangtang area, and also further confirm that the Middle Triassic of the southern Qiangtang basin was not an erosional or uplift area, but a bathyal-abyssal depositional area.
- Tibet,
- Qiangtang basin,
- Middle Triassic,
- radiolarian,
- Zuoqingcuo Formation,
- stratigraphy

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References(57)

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Radiolarian Fauna from Middle Triassic of Zuoqingcuo Formation, Southern Qiangtang Basin, Xizang, China, and Its Stratigraphic Significance

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