Identifying Crystal Accumulation in Granitoids through Amphibole Composition and In Situ Zircon O Isotopes in North Qilian Orogen

doi:10.1093/petrology/egab096

CORC > 海洋研究所 > 中国科学院海洋研究所

	Identifying Crystal Accumulation in Granitoids through Amphibole Composition and In Situ Zircon O Isotopes in North Qilian Orogen
	Chen, Shuo 1,4,5; Niu, Yaoling 2,3,5; Wang, Xiaohong 1,4,5; Xue, Qiqi 1; Sun, Wenli 6
刊名	JOURNAL OF PETROLOGY
	2021-12-01
卷号	62 期号:12 页码:18
关键词	amphibole zircon oxygen isotope cumulate granitoids mafic magmatic enclaves (MME)
ISSN号	0022-3530
DOI	10.1093/petrology/egab096
通讯作者	Chen, Shuo(shuochen@qdio.ac.cn)
英文摘要	Granitoids are the main constituents of the continental crust, and an understanding of their petrogenesis is key to the origin and evolution of continents. Whether crystal fractionation is the dominant way to generate evolved magmas has long been debated, mostly because such processes would produce large volumes of complementary cumulates, which remains elusive. Mafic magmatic enclaves (MMEs) are ubiquitous in granitoids and their presence was initially recognized as cumulates. However, because many MMEs lack obvious evidence of accumulation, such as the classic cumulate textures and modal layering, the cumulate origin of MMEs has been abandoned and the model of magma mixing between mafic and felsic magmas has become popular. In this study, we conduct a combined study of amphibole composition and in situ O isotopes in zircons on three suites of orogenic granitoids with MMEs from the North Qilian Orogenic Belt (NQOB). We find that the MMEs and their host granodiorites show overlapping zircon delta O-18 values, affirming that they share the same parental magmas. The amphibole compositions indicate that amphiboles from the MMEs are not in equilibrium with a melt whose composition was that of the bulk-rock. These new data, together with the published bulk-rock data, suggest that the MMEs in our study have clear cumulate signatures and are thus of cumulate origin. Our study provides evidence for crystal accumulation in granitoids in the NQOB. This new understanding calls for re-examination on the petrogenesis of some intermediate magmatic rocks (granitoid/andesite) in discussing models of continental crustal growth.
资助项目	National Natural Science Foundation (NSFC)[41906050] ; National Natural Science Foundation (NSFC)[41630968] ; National Natural Science Foundation (NSFC)[91958215] ; China Postdoctoral Science Foundation[2019 M652496] ; NSFC-Shandong Joint Fund for Marine Science Research Centers[U1606401] ; Youth Innovation Promotion Association, Chinese Academy of Sciences[2021206] ; 111 project[B18048]
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000745055500017
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/177732]
专题	中国科学院海洋研究所
通讯作者	Chen, Shuo
作者单位	1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.China Univ Geosci, Beijing 100083, Peoples R China 3.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England 4.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China 5.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China 6.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Chen, Shuo,Niu, Yaoling,Wang, Xiaohong,et al. Identifying Crystal Accumulation in Granitoids through Amphibole Composition and In Situ Zircon O Isotopes in North Qilian Orogen[J]. JOURNAL OF PETROLOGY,2021,62(12):18.
APA	Chen, Shuo,Niu, Yaoling,Wang, Xiaohong,Xue, Qiqi,&Sun, Wenli.(2021).Identifying Crystal Accumulation in Granitoids through Amphibole Composition and In Situ Zircon O Isotopes in North Qilian Orogen.JOURNAL OF PETROLOGY,62(12),18.
MLA	Chen, Shuo,et al."Identifying Crystal Accumulation in Granitoids through Amphibole Composition and In Situ Zircon O Isotopes in North Qilian Orogen".JOURNAL OF PETROLOGY 62.12(2021):18.