Sedimentary successions and onset of the Mesozoic Qiangtang rift basin (northern Tibet), Southwest China: Insights on the Paleo- and Meso-Tethys evolution

Wang, Zhongwei; Wang, Jian; Fu, Xiugen; Feng, Xinglei; Armstrong‐Altrin, John S.; Zhan, Wangzhong; Wan, Youli; Song, Chao; Ma, Lingling; Shen, Lijun

doi:10.1016/j.marpetgeo.2019.01.017

Cited by 21 publications

(16 citation statements)

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“…According to the palaeogeography of the basin (Fu et al, 2016; Wang et al, 2019), it was dominated by thin and high‐energy open platform shoal facies and foreslope of platform facies in the early stage of Buqu Formation (Xiong et al, 2009). In contrast, it was characterized by platform marginal shoal facies due to the southward progradation of the bright crystal oolitic limestone and vertical aggradation in the middle‐late stage of Buqu Formation.…”

Section: Resultsmentioning

confidence: 99%

“…The evolution of the Mesozoic Qiangtangrift Basin(T 3 ‐K 1 ) has experienced several stages. Volcanic‐volcanoclastic rocks of the Upper Triassic Nadi Kangri Formationmark the onset of the Mesozoic Qiangtang Rift Basin (Fu et al, 2010; Wang et al, 2019; Zeng et al, 2016). Three WNW‐trending rift troughs controlled the evolution of the Qiangtang rift basin during the Early–Middle Jurassic (Tan, Zhang, Wang, Si, & Ma, 2016; Wang et al, 2019).…”

Section: Resultsmentioning

confidence: 99%

“…River and delta facies developed along the margin of the basin, whereas tidal flat‐lagoon facies (mudstone and shale) were deposited in the middle of the basin (Figure 4b; Fu et al, 2016). These data indicate that the Qiangtang Basin experienced a large‐scale regression from the Buqu Formation to the Xiali Formation (Wang et al, 2004, 2019). Fossils such as bivalves, brachiopods, and ammonites found in the Xiali Formation (Bai, 1989; Chen, Yi, Hu, Zhong, & Shi, 2005; Zeng, Jian, Ming, Fu, & Wu, 2012), indicated a late Middle Jurassic (Callovian) age (Figure 2).…”

Section: Geological Settingmentioning

confidence: 98%

“…The opening of the Meso‐Tethys sea‐way marked the beginning of the Mesozoic marine sedimentary evolution in the Qiangtang Basin (Wang et al, 2004). The Mesozoic Qiangtang Basin, was a superimposed basin from the Late Triassic to Early Cretaceous, and developed from a foreland basin to a rift basin, then to a passive continental marginal basin, and finally into an active continental marginal basin through shrinking and vanishing (Wang et al, 2004, 2019). It extends more than 1,200 km from the east to the west with a maximum width of 500 km and a maximum thickness of 11 km.…”

Section: Geological Settingmentioning

confidence: 99%

“…The stratigraphy in the Qiangtang Basin displays a lithology alternating between carbonate rocks and clastic rocks, which is similar to that in the Western Tethys. It is known that there are demise events of carbonate platforms in the Qiangtang Basin that happened during the Middle–Late Jurassic (Wang et al, 2004, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Demise of the Middle Jurassic carbonate platform: Responses to sea‐level fall in the Qiangtang Basin, Eastern Tethys

Gao

et al. 2020

Geological Journal

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Many studies have been focused on the development of carbonate platforms, however, the controlling factors of their evolution are still unclear. The QTKT1 well, drilled in 2016 by the Chengdu Center of the China Geological Survey at the Northern Qiangtang Depression, has allowed further studies of Jurassic environments and resources in the Eastern Tethys. In this study, we investigate variations in spectral gamma‐ray logs and CaCO3 content and perform a cyclostratigraphic analysis in the Xiali mudstones and Buqu limestones and Xiali mudstone to analyse causes for the demise of the Middle Jurassic carbonate platform in the Qiangtang Basin. The concentrations of Th, K, U, and Th/U and Th/K ratios increase suddenly from the Buqu Formation to the Xiali Formation, suggesting increased terrigenous input and/or decreased carbonate production rates. Cyclostratigraphic analysis detects the existence of astronomical cycles and an abrupt change in sediment accumulation rates within the target intervals. Combined with sedimentary facies analysis, our research suggests that the demise of the Middle Jurassic carbonate platform may have been caused by terrigenous detrital inputs into the Qiangtang Basin. High‐frequency sea‐level fluctuations increased terrestrial inputs and carbonate production rates at the orbital scale. The regression happened before the facies change and controlled terrestrial inputs at a larger scale, which resulted in the demise of the carbonate platforms. Contrary to the Western Tethys, a regression took place from the Bathonian to Callovian ages in the Qiangtang Basin, Eastern Tethys, which increased the exposure levels. The large exposure led to significant erosion, accelerated detrital input from the land to the Northern Qiangtang Depression, reduced carbonate production as well as resulted in the demise of the Buqu carbonate platform. The relative sea‐level fall is mainly the result of the regional tectonism during this period.

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Section: Resultsmentioning

confidence: 99%