气候变化领域集成服务门户(CCPortal): Tracing material contributions from Saint Helena plume to the South Mid-Atlantic ridge system

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DOI	10.1016/j.epsl.2021.117130
	Tracing material contributions from Saint Helena plume to the South Mid-Atlantic ridge system
	Zhang H.; Yan Q.; Li C.; Shi X.; Yang Y.; Wang G.; Hua Q.; Zhu Z.; Zhang H.; Zhao R.
发表日期	2021
ISSN	0012821X
卷号	572
英文摘要	Ridge-hotspot interaction plays a significant role during the whole geological evolution history of Atlantic Ocean. Whether the ongoing spreading south Mid-Atlantic ridge (SMAR) is affected by those mantle plumes gradually migrating away from the ridge or not, need to be further explored. Here we investigate the chemical components of basalts from the SMAR 13.2°S–24.2°S segments, which contain the Saint Helena plume-like chemical traces that have enriched incompatible element ratios (e.g., K2O/TiO2, Nb/Zr, (La/Sm)N) and higher 87Sr/86Sr, 206Pb/204Pb and lower 143Nd/144Nd and 176Hf/177Hf relative to those plume-free SMAR MORBs. These, combining with geophysical data and off-axis seamounts data, show that the spatial scope of Saint Helena hotspot influence on SMAR system is bounded by the Cardno fracture zone (∼14.2°S) to the north and the Trinidade fracture zone (∼20.8°S) to the south. Furthermore, this study infers possible flow directions of the Saint Helena hotspot materials from Cardno seamount toward the SMAR system, and the ends of these flows directions are at the SMAR 14.2°S–20.8°S segments, where the basalts have stronger Saint Helena plume-related geochemical signals, and the ridge axes keep shallower axis depth and lower mantle Bouguer gravity anomaly relative to the other segments. Finally, we develop a sketch-like model to depict material flow styles from Saint Helena plume to the actively spreading SMAR regions along a sloping rheologically boundary layer at the lithospheric bottom. © 2021 Elsevier B.V.
关键词	mantle plume mantle sources ridge-hotspot interaction south MAR
英文关键词	Basalt; Boundary layers; Structural geology; Thermal plumes; Evolution history; Flow direction; Fracture zone; Geological evolution; Hot spot; Mantle plume; Mantle source; Mid Atlantic Ridge; Ridge-hotspot interaction; South MAR; Submarine geology
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203370
作者单位	Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, MNR, Qingdao, Shandong 266061, China; Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong 266061, China; National Deep Sea Center, MNR, Qingdao, 266061, China; Chengdu University of Technology, Chengdu, 610059, China; College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
推荐引用方式 GB/T 7714	Zhang H.,Yan Q.,Li C.,et al. Tracing material contributions from Saint Helena plume to the South Mid-Atlantic ridge system[J],2021,572.
APA	Zhang H..,Yan Q..,Li C..,Shi X..,Yang Y..,...&Zhao R..(2021).Tracing material contributions from Saint Helena plume to the South Mid-Atlantic ridge system.Earth and Planetary Science Letters,572.
MLA	Zhang H.,et al."Tracing material contributions from Saint Helena plume to the South Mid-Atlantic ridge system".Earth and Planetary Science Letters 572(2021).