Late Ordovician beachrock as a far-field indicator for glacial meltwater pulse

doi:10.3176/earth.2023.13

	Late Ordovician beachrock as a far-field indicator for glacial meltwater pulse
	Li, Qijian 1; Na, Lin 1; Yu, Shenyang 2; Lehnert, Oliver 3; Munneck, Axel 4; Li, Yue 1
刊名	ESTONIAN JOURNAL OF EARTH SCIENCES
	2023
卷号	72 期号:1 页码:1
关键词	glaciation palaeokarst Katian Tarim Block northwestern China
ISSN号	1736-4728
DOI	10.3176/earth.2023.13
通讯作者	Li, Qijian(qijianli@hotmail.com)
英文摘要	Understanding ancient climate changes is hampered by the inability to disentangle trends in continental ice volume from records of relative sea-level change. As a unique coastal deposit in tropical and subtropical regions, beachrock has been proved to be reliable for constraining the glacial meltwater signal and thus the total volume of land-based ice in Quaternary. However, beachrock is rarely recognized in the fossil record due to (a) the two-dimensional distribution of beach deposits, as opposed, for example, to extended platform sediments, and (b) the fact that specific environmental conditions are required in order to lithify sediments directly on the beach. By combining the stratigraphic architecture with petrography of characteristic carbonate cements, we demonstrate the first known occurrence of Ordovician beachrock in the Tarim Block, northwestern China. According to biostratigraphic data, a middle Katian (Upper Ordovician) palaeokarst surface is capped by carbonate conglomerate beachrock and this is suggesting a significant relative sea-level rise in late Katian. The beachrock can be correlated with widespread subaerial exposure surfaces and a pronounced stratigraphic gap within the Katian in north -western Tarim. We suggest that the beachrock 'fingerprinted' a strong melt-water pulse in high latitudes after a short-lived Katian glaciation, which has not received much attention in scientific papers so far.
WOS研究方向	Geology
语种	英语
出版者	ESTONIAN ACAD PUBLISHERS
WOS记录号	WOS:001019621500002
内容类型	期刊论文
源URL	[http://ir.nigpas.ac.cn/handle/332004/42596]
专题	中国科学院南京地质古生物研究所
通讯作者	Li, Qijian
作者单位	1.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, East Beijing Rd 39, Nanjing 210008, Peoples R China 2.Qufu Normal Univ, Sch Geog & Tourism, Yantai North Rd 80, Rizhao 276826, Peoples R China 3.Friedrich Alexander Univ Erlangen Nuremberg, Geozentrum Nordbayern, Crustal Dynam, Schlossgarten 5, D-91054 Erlangen, Germany 4.Friedrich Alexander Univ Erlangen Nuremberg, Geozentrum Nordbayern, Palaeo Environm, Loewenichstr 28, D-91054 Erlangen, Germany
推荐引用方式 GB/T 7714	Li, Qijian,Na, Lin,Yu, Shenyang,et al. Late Ordovician beachrock as a far-field indicator for glacial meltwater pulse[J]. ESTONIAN JOURNAL OF EARTH SCIENCES,2023,72(1):1.
APA	Li, Qijian,Na, Lin,Yu, Shenyang,Lehnert, Oliver,Munneck, Axel,&Li, Yue.(2023).Late Ordovician beachrock as a far-field indicator for glacial meltwater pulse.ESTONIAN JOURNAL OF EARTH SCIENCES,72(1),1.
MLA	Li, Qijian,et al."Late Ordovician beachrock as a far-field indicator for glacial meltwater pulse".ESTONIAN JOURNAL OF EARTH SCIENCES 72.1(2023):1.