Marine depositional signatures of the Aptian Oceanic Anoxic Events in the Eastern Tethys, Lower Indus Basin, Pakistan

doi:10.1080/08120099.2021.1959399

IVPP-IR > 中科院古脊椎所（2000年以后）

	Marine depositional signatures of the Aptian Oceanic Anoxic Events in the Eastern Tethys, Lower Indus Basin, Pakistan
	Khan, S.1; Kroon, D.2; Wadood, B.3,4; Ahmad, S.1; Zhou, X.5
	2021-08-12
发表期刊	AUSTRALIAN JOURNAL OF EARTH SCIENCES
ISSN	0812-0099
页码	17
通讯作者	Khan, S.()
摘要	The depositional signatures of the Cretaceous OAE1a and OAE1b intervals in the Parh Formation, Lower Indus Basin, Pakistan, Eastern Tethys, have been studied to better constrain the Aptian-Albian ocean-climate system. Based on the microfacies attributes, an outer ramp to deep basin is suggested for the deposition of Parh Formation. The quasi-periodic occurrences of radiolarian-rich microfacies and the cyclicity between the outer ramp and deep basin settings throughout the section suggest eutrophication in this part of the Eastern Tethys influenced by Milankovitch cycles. The clastic influx during OAE1a and OAE1b intervals indicate the role of continental runoff in the eutrophication of the basin. The overall negative covariance between radiolarian-rich microfacies and clastic input suggests that upwelling was a major driver of nutrient enrichment rather than continental runoff. The organic enrichment along with pyrite framboids and lack of burrows suggest that dysoxic-anoxic bottom water conditions were common throughout the Aptian and not just in the OAE1a and OAE1b intervals. The poor ventilation of the sea floor was a result of restricted circulation and may have triggered sustained anoxia during Aptian in this part of the Eastern Tethys. Bottom-water currents recharged coarser clastics to the deeper part of the basin during OAE1a and OAE1b intervals. However, the effects of deep ventilated oxic water during the events were reduced by persistent ocean anoxia. Furthermore, the dominance of carbonate sediments throughout the Aptian-lower Albian succession suggests relatively alkaline oceans in this part of Eastern Tethys. A pronounced sea-level rise, as suggested elsewhere was not observed during OAE1a and OAE1b intervals in this part of the Tethys.
关键词	microfacies eutrophication anoxic Tethys Milankovitch cycle upwelling productivity
DOI	10.1080/08120099.2021.1959399
关键词[WOS]	CARBONATE PLATFORM ; CRETACEOUS CLIMATE ; MOUNTAIN BELTS ; OAE 1B ; MICROFACIES ; RAMP ; STRATIGRAPHY ; EVOLUTION ; SECTION ; FACIES
收录类别	SCI
语种	英语
资助项目	Strategic Pilot Science and Technology Projects of the Chinese Academy of Sciences[XDB26000000]
项目资助者	Strategic Pilot Science and Technology Projects of the Chinese Academy of Sciences
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000684484000001
出版者	TAYLOR & FRANCIS LTD
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/18188
专题	中科院古脊椎所（2000年以后）
通讯作者	Khan, S.
作者单位	1.Univ Peshawar, Dept Geol, Peshawar, Pakistan 2.Univ Edinburgh, Grant Inst, Dept Geol & Geophys, Edinburgh, Midlothian, Scotland 3.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian, Peoples R China 4.Univ Swabi, Dept Geol, Swabi, Pakistan 5.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Khan, S.,Kroon, D.,Wadood, B.,et al. Marine depositional signatures of the Aptian Oceanic Anoxic Events in the Eastern Tethys, Lower Indus Basin, Pakistan[J]. AUSTRALIAN JOURNAL OF EARTH SCIENCES,2021:17.
APA	Khan, S.,Kroon, D.,Wadood, B.,Ahmad, S.,&Zhou, X..(2021).Marine depositional signatures of the Aptian Oceanic Anoxic Events in the Eastern Tethys, Lower Indus Basin, Pakistan.AUSTRALIAN JOURNAL OF EARTH SCIENCES,17.
MLA	Khan, S.,et al."Marine depositional signatures of the Aptian Oceanic Anoxic Events in the Eastern Tethys, Lower Indus Basin, Pakistan".AUSTRALIAN JOURNAL OF EARTH SCIENCES (2021):17.