The Upper Triassic deposits of the west Bangong-Nujiang suture zone and their paleogeographic implications

Abstract The Bangong-Nujiang Suture Zone (BNSZ) of Tibet (Xizang) has been interpreted to represent a relic of the Bangong-Nujiang Ocean. However, the existence of this ocean during Triassic time remains a point of contention. A sedimentary succession spanning the Upper Permian through Triassic desc...

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Autores principales:	Guichun Wu, Zhansheng Ji, Gary G. Lash, Jianxin Yao
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/86db20a6b4594d9e8c07424adc5a6593
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spelling	oai:doaj.org-article:86db20a6b4594d9e8c07424adc5a65932021-12-02T17:37:35ZThe Upper Triassic deposits of the west Bangong-Nujiang suture zone and their paleogeographic implications10.1038/s41598-021-98257-52045-2322https://doaj.org/article/86db20a6b4594d9e8c07424adc5a65932021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-98257-5https://doaj.org/toc/2045-2322Abstract The Bangong-Nujiang Suture Zone (BNSZ) of Tibet (Xizang) has been interpreted to represent a relic of the Bangong-Nujiang Ocean. However, the existence of this ocean during Triassic time remains a point of contention. A sedimentary succession spanning the Upper Permian through Triassic described from the central BNSZ suggests that the Lhasa and South Qiangtang terranes were contiguous thus negating the existence of a terrane-separating ocean during Triassic time. However, the apparent lack of Triassic deposits in the west BNSZ has called into question the existence of Triassic deposits in the central region of the BNSZ. Our biostratigraphic work in the Wuga Formation of the Gaize area has yielded abundant Norian conodonts thus confirming the existence of Upper Triassic deposits in the west BNSZ. The clastic deposits of the Wuga Formation are herein interpreted to be of Rhaetian age. Moreover, intercalated limestone and chert are termed the Dongnale Formation of Norian age. The Norian to Rhaetian succession can be correlated with strata of the central BNSZ as well as with deposits of the Lhasa Terrane and the South Qiangtang Terrane. Similar stratigraphies among these regions through the Late Triassic suggests a shared depositional setting and that the BNSZ was not an ocean in Norian and Rhaetian time.Guichun WuZhansheng JiGary G. LashJianxin YaoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Guichun Wu Zhansheng Ji Gary G. Lash Jianxin Yao The Upper Triassic deposits of the west Bangong-Nujiang suture zone and their paleogeographic implications
description	Abstract The Bangong-Nujiang Suture Zone (BNSZ) of Tibet (Xizang) has been interpreted to represent a relic of the Bangong-Nujiang Ocean. However, the existence of this ocean during Triassic time remains a point of contention. A sedimentary succession spanning the Upper Permian through Triassic described from the central BNSZ suggests that the Lhasa and South Qiangtang terranes were contiguous thus negating the existence of a terrane-separating ocean during Triassic time. However, the apparent lack of Triassic deposits in the west BNSZ has called into question the existence of Triassic deposits in the central region of the BNSZ. Our biostratigraphic work in the Wuga Formation of the Gaize area has yielded abundant Norian conodonts thus confirming the existence of Upper Triassic deposits in the west BNSZ. The clastic deposits of the Wuga Formation are herein interpreted to be of Rhaetian age. Moreover, intercalated limestone and chert are termed the Dongnale Formation of Norian age. The Norian to Rhaetian succession can be correlated with strata of the central BNSZ as well as with deposits of the Lhasa Terrane and the South Qiangtang Terrane. Similar stratigraphies among these regions through the Late Triassic suggests a shared depositional setting and that the BNSZ was not an ocean in Norian and Rhaetian time.
format	article
author	Guichun Wu Zhansheng Ji Gary G. Lash Jianxin Yao
author_facet	Guichun Wu Zhansheng Ji Gary G. Lash Jianxin Yao
author_sort	Guichun Wu
title	The Upper Triassic deposits of the west Bangong-Nujiang suture zone and their paleogeographic implications
title_short	The Upper Triassic deposits of the west Bangong-Nujiang suture zone and their paleogeographic implications
title_full	The Upper Triassic deposits of the west Bangong-Nujiang suture zone and their paleogeographic implications
title_fullStr	The Upper Triassic deposits of the west Bangong-Nujiang suture zone and their paleogeographic implications
title_full_unstemmed	The Upper Triassic deposits of the west Bangong-Nujiang suture zone and their paleogeographic implications
title_sort	upper triassic deposits of the west bangong-nujiang suture zone and their paleogeographic implications
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/86db20a6b4594d9e8c07424adc5a6593
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The Upper Triassic deposits of the west Bangong-Nujiang suture zone and their paleogeographic implications

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