气候变化领域集成服务门户(CCPortal): Initiation of modern-style subduction in the Neoarchean: From plume to subduction with frequent slab break-off

CCPortal

DOI	10.1130/B35522.1
	Initiation of modern-style subduction in the Neoarchean: From plume to subduction with frequent slab break-off
	Li D.; Chen Y.; Xue G.; Kang H.; Yu Y.; Geng J.; Zhang Y.; Li T.
发表日期	2020
ISSN	167606
起始页码	2119
结束页码	2134
卷号	132 期号:2021-09-10
英文摘要	Fundamental geodynamic changes from vertical tectonics to lateral subduction occurred during the Neoarchean, yet detailed processes related to this transition and initiation of modern-style subduction remain enigmatic. Successive Neoarchean magmatic rocks including both plume-derived komatiites and subduction-related supracrustal and intrusive rocks appeared and preserved key information on the late Archean geodynamic changes in the Western Shandong Province granite-greenstone belt (WSP), North China Craton. In this study, whole-rock geochemical and Sm-Nd isotopic data and zircon U-Pb and Lu-Hf isotopes are reported for early Neoarchean supracrustal and intrusive rocks for the WSP. Temporally, the early Neoarchean magmatic movements in the WSP can be subdivided into two stages, including the early stage (2.77-2.69 Ga) and the late stage (2.69-2.60 Ga). Spatially, from southwest to northeast, intrusive rocks with similar ages define three belts (A, B, and C). Early stage tholeiitic and enriched meta-basalts were plume-related, representing oceanic crust opening from a pre-early Neoarchean continent. Slab subduction at least initiated at ca. 2.74 Ga and generated various Neoarchean tonalite-trondhjemite-granodiorites, quartz diorites, and arc-related volcanic rocks and mafic intrusions. Episodic emergence of meta-basaltic rocks and/or mafic intrusions with depleted eHf(t) values and low (La/Yb)N ratios indicates frequent slab break-offs during ca. 2.70-2.68 Ga, 2.66-2.64 Ga, and 2.62-2.60 Ga due to a relatively hotter mantle and regional heating by mantle plume. Secular geochemical changes of mafic and felsic rocks in this study outline roles of slab subduction in contributions of cooling the mantle, secular mantle refertilization, and crustal growth. © 2019 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/184722
作者单位	School of Earth Science and Resources, China University of Geosciences, Beijing, 100083, China; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Chinese Academy of Geological Sciences, Beijing, 100037, China; Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, 100094, China; Tianjin Center of Geological Survey, China Geological Survey, Tianjin, 300170, China
推荐引用方式 GB/T 7714	Li D.,Chen Y.,Xue G.,et al. Initiation of modern-style subduction in the Neoarchean: From plume to subduction with frequent slab break-off[J],2020,132(2021-09-10).
APA	Li D..,Chen Y..,Xue G..,Kang H..,Yu Y..,...&Li T..(2020).Initiation of modern-style subduction in the Neoarchean: From plume to subduction with frequent slab break-off.Bulletin of the Geological Society of America,132(2021-09-10).
MLA	Li D.,et al."Initiation of modern-style subduction in the Neoarchean: From plume to subduction with frequent slab break-off".Bulletin of the Geological Society of America 132.2021-09-10(2020).