Recognizing crystal accumulation in plutonic system: Evidence from mafic microgranular enclaves in Early Silurian Qingshan granodiorite, North Qilian Orogenic Belt, NW China

doi:10.1016/j.lithos.2024.107518

	Recognizing crystal accumulation in plutonic system: Evidence from mafic microgranular enclaves in Early Silurian Qingshan granodiorite, North Qilian Orogenic Belt, NW China
	Yan, Maoqiang 1,2; Li, Guomeng 3,4; Shi, Wenjie 2; Huizenga, Jan Marten 5,6,7,8; Turlin, Francois 9; Xu, Chongwen 2; Moritz, Robert 9; Wei, Junhao 2
	2024-03-01
发表期刊	LITHOS
ISSN	0024-4937
卷号	468 页码:20
通讯作者	Shi, Wenjie([email protected]) ; Wei, Junhao([email protected])
摘要	Granitoids are the primary constituents of the continental crust; recognizing and quantifying the effects of crystal accumulation in evolved magmas is a challenging task. Here we present whole-rock chemical, Sr-Nd isotopic, zircon U-Pb geochronological, and Hf isotopic data as well as EPMA and in-situ LA-ICP-MS analyses of amphiboles from Qingshan granodiorite and mafic microgranular enclaves (MMEs) from the North Qilian Orogenic Belt (NQOB). The MMEs and granodiorite have identical crystallisation ages (ca. 434 Ma), the same mineral assemblage, but different mineral modal proportions as the MMEs comprise more amphibole. The MMEs and granodiorite have indistinguishable and depleted zircon Hf (epsilon Hf (t) values of 6.1-8.3, and 6.4-9.1, respectively) and whole-rock Sr-Nd isotopic compositions, i.e. (87Sr/86Sr)i values of 0.70514-0.70913 and 0.70207-0.70552, respectively; and epsilon Nd(t) values of 0.27-2.23 and 0.21-2.39, respectively. The occurrence of idiomorphic amphibole grains, low MREEs and HREEs concentration, low Mg# values of equilibrium melts (AEMs), and decreasing Zr/Hf ratios indicate that Qingshan MMEs represent cumulates formed at a thermal boundary layer between the ascending conduits and the wall rocks. The Qingshan granodiorite was formed by partial melting of subducted oceanic crust with crustal materials during southward subduction of the North Qilian Ocean, followed by further amphibole-dominated fractionation by compaction without crystal deformation. We propose a model of southward subduction with the back-arc basin for the tectonic evolution of the western NQOB. Both the subduction- and collision-related granitoids of the NQOB have played a vital role in continental crust growth.
关键词	Amphibole Crystal accumulation Cumulate Mafic magmatic enclaves (MMEs) North Qilian Orogenic Belt Continental crust growth
DOI	10.1016/j.lithos.2024.107518
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[41772071]
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
WOS类目	Geochemistry & Geophysics ; Mineralogy
WOS记录号	WOS:001174550600001
出版者	ELSEVIER
WOS关键词	CONTINENTAL-CRUST GROWTH ; AMPHIBOLE FRACTIONATION ; SUBDUCTION INITIATION ; FELSIC MAGMATISM ; INTRUSIVE ROCKS ; ARC MAGMATISM ; GANGDESE ARC ; PETROGENESIS ; GRANITES ; GEOCHEMISTRY
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/184972
专题	深海极端环境与生命过程研究中心
通讯作者	Shi, Wenjie; Wei, Junhao
作者单位	1.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Peoples R China 2.China Univ Geosci, Sch Earth Resources, Wuhan 430074, Peoples R China 3.Jiangxi Explorat Breakthrough Technol Ctr, Nanchang 330052, Jiangxi, Peoples R China 4.Jiangxi Bur Geol, Geol Brigade 1, Nanchang 330052, Jiangxi, Peoples R China 5.Norwegian Univ Life Sci, Fac Environm Sci, POB 5003, NO-1432 As, Norway 6.Norwegian Univ Life Sci, Nat Resource Management, POB 5003, NO-1432 As, Norway 7.James Cook Univ, Coll Sci & Engn, Econ Geol Res Ctr EGRU, Townsville, Qld 4811, Australia 8.Univ Johannesburg, Dept Geol, POB 524, ZA-2006 Auckland Pk, South Africa 9.Univ Geneva, Dept Earth Sci, CH-1205 Geneva, Switzerland
第一作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Yan, Maoqiang,Li, Guomeng,Shi, Wenjie,et al. Recognizing crystal accumulation in plutonic system: Evidence from mafic microgranular enclaves in Early Silurian Qingshan granodiorite, North Qilian Orogenic Belt, NW China[J]. LITHOS,2024,468:20.
APA	Yan, Maoqiang.,Li, Guomeng.,Shi, Wenjie.,Huizenga, Jan Marten.,Turlin, Francois.,...&Wei, Junhao.(2024).Recognizing crystal accumulation in plutonic system: Evidence from mafic microgranular enclaves in Early Silurian Qingshan granodiorite, North Qilian Orogenic Belt, NW China.LITHOS,468,20.
MLA	Yan, Maoqiang,et al."Recognizing crystal accumulation in plutonic system: Evidence from mafic microgranular enclaves in Early Silurian Qingshan granodiorite, North Qilian Orogenic Belt, NW China".LITHOS 468(2024):20.