Analogous diagenetic conditions of dark enclave and its host granite derived by magma mixing: Evidence for a post-mixing magmatic process

doi:10.1016/j.lithos.2020.105373

CORC > 海洋研究所 > 中国科学院海洋研究所 > 深海极端环境与生命过程研究中心

	Analogous diagenetic conditions of dark enclave and its host granite derived by magma mixing: Evidence for a post-mixing magmatic process
	Sun, Sai-Jun 1,2,3,4; Zhang, Rong-Qing 7; Cong, Ya-Nan 6; Zhang, Li-Peng 3,4; Sun, Wei-Dong 1,2,3,4; Li, Cong-Ying 2,4; Ding, Xing 5
刊名	LITHOS
	2020-03-01
卷号	356 页码:12
关键词	Mafic microgranular enclaves (MMEs) Minerals P-T-fO(2)-H2O Subduction traces Magma mixing
ISSN号	0024-4937
DOI	10.1016/j.lithos.2020.105373
通讯作者	Ding, Xing(xding@gig.ac.cn)
英文摘要	Mafic microgranular enclaves (MMEs) are commonly formed during magma mixing and usually record contrasting physicochemical diagenetic characteristics relative to their host rocks. We present a finding that some MMEs from the Cretaceous Qianjia pluton, which is believed to be the product of magma mixing, exhibit diagenetic conditions analogous to those of their host granites. Integrated calculations based on in situ compositions of minerals (e.g., zircon, titanite, amphibole, feldspar, and apatite) from the Qianjia monzonitic MMEs and their host granites indicate that they exhibit similar diagenetic temperatures (700-800 degrees C) and pressures (0.20-028 GPa), but discrepant oxygen fugacity and water activity. The MMEs have higher oxygen fugacity and water activity, as well as lower Th/U ratios, compared to the host granites, suggesting more oxidized and H2O-rich circumstances. Besides, high F concentrations and F/Cl ratios in apatites from both the MMEs and host granites and their parent magma indicate a relatively F-rich magma source that was probably derived by F-bearing mineral dehydration during plate subduction. Similar physicochemical diagenetic conditions between the MMEs and their host granites seemingly reveal their cognate features; however, slight differences in the oxygen fugacity, water activity, and chemistry of certain minerals (e.g., apatite and titanite) provide clues on magma mixing. We therefore propose that the MMEs involved might have been derived from local heterogeneous hybrid melts or by early crystallization during a post-mixing process. In this case, information about the magma mixing has been almost eliminated due to the geochemical re-equilibration. Therefore, in the case of magma-mixing derived intrusions, the MMEs could be formed not only during magma mixing but also during a post-mixing stage, in which certain minerals most likely preserved a few geochemical characteristics of magma mixing. (C) 2020 Elsevier B.V. All rights reserved.
资助项目	National Natural Science Foundation of China[41903005] ; National Key R&D Program of China[2016YFC0600408] ; China Postdoctoral Science of Foundation[2019M662458] ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB18020102]
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000520941500010
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/166984]
专题	海洋研究所_深海极端环境与生命过程研究中心
通讯作者	Ding, Xing
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China 4.Chinese Acad Sci, Ctr Deep Sea Res, Ctr Ocean Megasci, Inst Oceanol, Qingdao 266071, Peoples R China 5.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 6.Inner Mongolia Minerals Expt Res Inst, Hohhot 010000, Peoples R China 7.Nanjing Univ, State Key Lab Mineral Deposits Res, Sch Earth Sci & Engn, Nanjing 210023, Peoples R China
推荐引用方式 GB/T 7714	Sun, Sai-Jun,Zhang, Rong-Qing,Cong, Ya-Nan,et al. Analogous diagenetic conditions of dark enclave and its host granite derived by magma mixing: Evidence for a post-mixing magmatic process[J]. LITHOS,2020,356:12.
APA	Sun, Sai-Jun.,Zhang, Rong-Qing.,Cong, Ya-Nan.,Zhang, Li-Peng.,Sun, Wei-Dong.,...&Ding, Xing.(2020).Analogous diagenetic conditions of dark enclave and its host granite derived by magma mixing: Evidence for a post-mixing magmatic process.LITHOS,356,12.
MLA	Sun, Sai-Jun,et al."Analogous diagenetic conditions of dark enclave and its host granite derived by magma mixing: Evidence for a post-mixing magmatic process".LITHOS 356(2020):12.