气候变化领域集成服务门户(CCPortal): Can climatic signals be discerned in a deep-water sink?: An answer from the Pearl River source-to-sink sediment-routing system

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DOI	10.1130/B31578.1
	Can climatic signals be discerned in a deep-water sink?: An answer from the Pearl River source-to-sink sediment-routing system
	Gong C.; Blum M.D.; Wang Y.; Lin C.; Xu Q.
发表日期	2018
ISSN	167606
起始页码	661
结束页码	677
卷号	130 期号:2021-03-04
英文摘要	Using integrated two- and three-dimensional seismic and shallow borehole data from the Pearl River source-to-sink system, this study demonstrates that submarine fan deposition records climatic signals of Asian monsoons and the mid-Pleistocene climate transition, but with a lag time of 100 k.y., providing new tools to predict the past climate and important insights in source-tosink context. Specifically, cooler and drier climates during weakened monsoons from marine oxygen isotope stages (MIS) 20 to 12 (814-478 ka), with reduced global ice volumes, led to decreased overall sediment supply and reduced amplitudes of sea-level change, which, in turn, decreased crossshelf transit distances and gave rise to much sandier prograding intraslope fans. Warmer and wetter strengthened monsoons from MIS 12 to 1 (478 ka to recent), with larger global ice volumes and corresponding amplitudes of sea-level change, in contrast, led to increased overall sediment supply but served to increase cross-shelf transit distances, resulting in much muddier retrograding intraslope fans. Climatic changes in source areas, coupled with global climate and sea-level changes, therefore modulated the lithological characteristics of terminal sinks in the Pearl River source-to-sink system. High-frequency (43 k.y.) and low-amplitude sea-level changes (mean value of sea level = -55.8 m, with the standard deviation of ±24.2 m) during the mid-Pleistocene climate transition caused shorelines to more frequently reside proximal enough to the shelf edge to deliver coarse sediments to deep-water areas, leading to higher sediment delivery rates (Rs) of 5-15 km/m.y. and larger prograding intraslope submarine fans. Lower-frequency (100 k.y.) and higheramplitude sea-level fluctuations (mean value of sea level = -62.7 m, with the standard deviation of ±33.2 m) after the mid-Pleistocene climate transition, in contrast, prevented shorelines from staying close enough to the shelf edge to continuously deliver coarse sediments to deep water, resulting in lower Rs of 4-8 km/m.y. and smaller retrograding intraslope submarine fans. Climatically controlled eustatic fluctuations, thus, determined sediment delivery rates and volumes of the terminus of source-to-sink systems. © 2017 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185074
作者单位	State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, Beijing, 102249, China; College of Geosciences, China University of Petroleum (Beijing), Beijing, 102249, China; Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX 78712, United States; Department of Geology, University of Kansas, Lawrence, KS 66045, United States; Ocean College, Zhejiang University, Hangzhou, Zhejiang, 310058, China; School of Ocean Sciences, China University of Geosciences, Beijing, 100083, China; China National Offshore Oil Corporation (CNOOC) Research Center, Beijing, 100027, China
推荐引用方式 GB/T 7714	Gong C.,Blum M.D.,Wang Y.,et al. Can climatic signals be discerned in a deep-water sink?: An answer from the Pearl River source-to-sink sediment-routing system[J],2018,130(2021-03-04).
APA	Gong C.,Blum M.D.,Wang Y.,Lin C.,&Xu Q..(2018).Can climatic signals be discerned in a deep-water sink?: An answer from the Pearl River source-to-sink sediment-routing system.Bulletin of the Geological Society of America,130(2021-03-04).
MLA	Gong C.,et al."Can climatic signals be discerned in a deep-water sink?: An answer from the Pearl River source-to-sink sediment-routing system".Bulletin of the Geological Society of America 130.2021-03-04(2018).