西藏则学地区古特提斯残留洋盆沉积充填及源区构造背景

周江羽; 魏启荣; 王健; 许欢; 赵闪; 吉雪峰; 欧波; 王旭东; 陈泰一

doi:10.3799/dqkx.2018.551

Volume 43 Issue 6

Jun. 2018

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Article Navigation > Earth Science > 2018 > 43(6): 2116-2132

Zhou Jiangyu, Wei Qirong, Wang Jian, Xu Huan, Zhao Shan, Ji Xuefeng, Ou Bo, Wang Xudong, Chen Taiyi, 2018. Depositional Filling and Tectonic Settings of Provenance of Paleotethys Remnant Oceanic Basin in Zexue District, Tibet, China. Earth Science, 43(6): 2116-2132. doi: 10.3799/dqkx.2018.551

Citation:

Zhou Jiangyu, Wei Qirong, Wang Jian, Xu Huan, Zhao Shan, Ji Xuefeng, Ou Bo, Wang Xudong, Chen Taiyi, 2018. Depositional Filling and Tectonic Settings of Provenance of Paleotethys Remnant Oceanic Basin in Zexue District, Tibet, China. Earth Science, 43(6): 2116-2132. doi: 10.3799/dqkx.2018.551

Citation:

Zhou Jiangyu, Wei Qirong, Wang Jian, Xu Huan, Zhao Shan, Ji Xuefeng, Ou Bo, Wang Xudong, Chen Taiyi, 2018. Depositional Filling and Tectonic Settings of Provenance of Paleotethys Remnant Oceanic Basin in Zexue District, Tibet, China. Earth Science, 43(6): 2116-2132. doi: 10.3799/dqkx.2018.551

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Depositional Filling and Tectonic Settings of Provenance of Paleotethys Remnant Oceanic Basin in Zexue District, Tibet, China

doi: 10.3799/dqkx.2018.551

1.
Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China
2.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2018-02-01
Publish Date: 2018-06-15

Abstract

Abstract

The study of the sedimentology and tectonic settings of the Paleotethys remnant oceanic basins is of great significance to reveal the formation, evolution, and its regularity of ore formation of the Tibetan plateau. The paleotethys remnant oceanic basin in Zexue district is located in the Lhasa block in south Gangdese zone. Based on the data such as field measured profiles, typical outcrops, rock sections, biostratigraphy and depo-geochemistry, we conducted the study on deep-water basin stratigraphy, sedimentology, sedimentary evolution and provenance tectonic settings of the Late Paleozoic paleotethys remnant oceanic basin. Current research indicates that the Late Paleozoic strata developed in the study area are mainly composed of pebbled fine clastic rocks and sandstone, which include pebbled-siltstone, mudstone and sandstone. The sand body is dominated by sheetlike and lenticular form, rich sedimentary structure, and the obvious Late Paleozoic sporo-pollen combination. The remnant oceanic basin experienced the evolutionary phases of sedimentary filling, which from continental slope-, deepwater basin-, continental shelf delta-, littoral-shallow basin-, coastal delta, to bay basin. The clastic sediment geochemical composition and their ratios of the main elements have characteristic of the lower Fe₂O₃+MgO (5.1%-10.0%), TiO₂ (0.44%-0.84%), Al₂O₃/SiO₂ (0.12-0.26), and higher K₂O/Na₂O. The results of the composition of trace and rare elements show higher ∑REE, LREE, La/Yb, (Gd/Yb)_N, (La/Yb)_N ratio, and weak Eu negative anomaly. It suggests that the provenance area has the characteristics of active continental margin and the continental island arc. It is concluded that the tectonic-sedimentary background of the Late Paleozoic in study area was in the continental margin rifting in extension background, intensive tectonic-magmatic activities and uplift, and the characteristic of more stable inheritance evolution. Sedimentary filling and evolution of the basin recorded the gradual regression process and the closure of the remnant oceanic basins in the Paleotethys.
- sedimentary evolution,
- geochemistry,
- deep-water basin,
- Paleotethys,
- petroleum geology,
- Tibet,
- tectonics

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