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Analogous diagenetic conditions of dark enclave and its host granite derived by magma mixing: Evidence for a post-mixing magmatic process
Sun, Sai-Jun1,2,3,4; Zhang, Rong-Qing5; Cong, Ya-Nan6; Zhang, Li-Peng1,2; Sun, Wei-Dong1,2,3,4; Li, Cong-Ying1,3; Ding, Xing7
2020-03-01
Source PublicationLITHOS
ISSN0024-4937
Volume356Pages:12
Corresponding AuthorDing, Xing(xding@gig.ac.cn)
AbstractMafic 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.
KeywordMafic microgranular enclaves (MMEs) Minerals P-T-fO(2)-H2O Subduction traces Magma mixing
DOI10.1016/j.lithos.2020.105373
Indexed BySCI
Language英语
Funding ProjectNational 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 Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000520941500010
PublisherELSEVIER
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/166985
Collection深海极端环境与生命过程研究中心
Corresponding AuthorDing, Xing
Affiliation1.Chinese Acad Sci, Ctr Deep Sea Res, Ctr Ocean Megasci, Inst Oceanol, Qingdao 266071, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China
3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Nanjing Univ, State Key Lab Mineral Deposits Res, Sch Earth Sci & Engn, Nanjing 210023, Peoples R China
6.Inner Mongolia Minerals Expt Res Inst, Hohhot 010000, Peoples R China
7.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
First Author AffilicationCenter for Ocean Mega-Science, Chinese Academy of Sciences
Recommended Citation
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.
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