Cite this paper:
JIANG Zuzhou, SUN Zhilei, LIU Zhaoqing, CAO Hong, GENG Wei, XU Haixia, WANG Lisheng, WANG Libo. Rare-earth element geochemistry reveals the provenance of sediments on the southwestern margin of the Challenger Deep[J]. HaiyangYuHuZhao, 2019, 37(3): 998-1009

Rare-earth element geochemistry reveals the provenance of sediments on the southwestern margin of the Challenger Deep

JIANG Zuzhou1,2,3, SUN Zhilei2,3, LIU Zhaoqing4, CAO Hong2,3, GENG Wei2,3, XU Haixia5, WANG Lisheng6, WANG Libo2,3
1 School of Geosciences, China University of Petroleum, Qingdao 266580, China;
2 Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;
3 Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266071, China;
4 China Three Gorges New Energy Corp., Beijing 100053, China;
5 Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China;
6 Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Abstract:
The hadal zone represents one of the last great frontiers in modern marine science, and deciphering the provenance of sediment that is supplied to these trench settings remains a largely unanswered question. Here, we examine the mineralogical and geochemical composition of a sediment core (core CD-1) that was recovered from the southwestern margin of the Challenger Deep within the Mariana Trench. Major element abundances and rare-earth element patterns from these sediments require inputs from both terrigenous dust and locally sourced volcanic debris. We exploit a two-endmember mixing model to demonstrate that locally sourced volcanic material dominates the sediment supply to the Challenger Deep (averaging~72%). The remainder, however, is supplied by aeolian dust (averaging~28%), which is consistent with adjacent studies that utilized Sr-Nd isotopic data. Building on a growing database, we strengthen our understanding of Asian aeolian dust input into the northwestern Pacific, which ultimately improves our appreciation of sedimentation in, and around, the hadal zone.
Key words:    Challenger Deep|sediment|rare-earth elements|provenance|Asian aeolian dust   
Received: 2018-03-05   Revised: 2018-04-24
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Articles by JIANG Zuzhou
Articles by SUN Zhilei
Articles by LIU Zhaoqing
Articles by CAO Hong
Articles by GENG Wei
Articles by XU Haixia
Articles by WANG Lisheng
Articles by WANG Libo
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