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Gabbroic xenoliths and glomerocrysts in the post-collisional trachyandestic rocks from Tengchong, SE Tibet: Implications for the magma chamber processes

文献类型：期刊论文

作者Cheng ZhiHui1,4; Yang ZhiJun1,4; Zhao WenBin3; Zhang MaoLiang2; Lei Ming3; Ma Lin3; Li JuJing3
刊名ACTA PETROLOGICA SINICA
出版日期2020
卷号36期号:7页码:2127-2148
关键词Post-collisional trachyandesites Gabbroic xenoliths Glomerocrysts P-T estimation Magmatic plumbing system SE Tibet
ISSN号1000-0569
DOI10.18654/1000-0569/2020.07.14
英文摘要Post-collisional high -K calc-alkaline magmatic activities (8Ma to present) with eruption of basalts, basaltic andesites, trachyandesites and dacites are extensively distributed in the Tengchong volcanic field, SE Tibet. Plenty of gabbroic xenoliths and glomerocrysts were entrained by the Late Pleistocene (0. 3 similar to 0. 4Ma) trachyandesites. There are two types of gabbroic xenoliths: Type I xenoliths (2 similar to 4cm in size) are in open structures and consist of plagioclase (50% similar to 60%), clinopyroxene (20% similar to 30%) and orthopyroxene (5% similar to 10%) with interstitial glass; Type II xenoliths (2 similar to 12cm in size) contain plagioclase ( 40% similar to 50%), clinopyroxene (30% similar to 40%) and Fe-Ti oxide (5% similar to 10%) with interstitial orthopyroxene and glass. The glomerocrysts (2 similar to 5mm in size) are also in open structures, and they are composed of plagioclase ( 40% similar to 60%), clinopyroxene (20% similar to 30%) and orthopyroxene (5% similar to 10%) with interstitial glass. The gabbroic xenoliths and glomerocrysts display similar mineral assemblage (plagioclase + clinopyroxene + orthopyroxene) with phenocrysts of the host lava. The clinopyroxenes from xenoliths, glomerocrysts and phenocrysts show similar trace element patterns. Furthermore, gabbroic xenoliths display similar whole -rock Sr, Nd and Pb isotopes to the host lava. We interpret these to indicate a genetic link between xenoliths (plus glomerocrysts) and the trachyandesitic magma, suggesting that the gabbroic xenoliths and glomerocrysts belong to the magmatic system in the Tengchong volcanic field. Results of P-T estimation indicate that the glomerocrysts and gabbroic xenoliths appear to have crystallized at the upper environment of the trachyandesitic magma reservoir. The glomerocrysts and gabbroic xenoliths with open structures contain residual interstitial glass, suggestting that they are fragments of partially solidified crystal mush: the glomerocrysts and Type I xenoliths which are in equilibrium with the melt appear to have crystallized from the host trachyandesitic melts; Type II xenoliths may have crystallized from a more evolved magma based on the lower Mg# of the clinopyroxene. The crystal mush may have been disaggregated by the rapid ascending trachyandesitic magma and carried to the surface as glomerocrysts and gabbroic xenoliths. Recharge by mafic magmas in magma reservoir may be the main trigger for eruption.
WOS关键词CENOZOIC VOLCANIC-ROCKS ; DEEP CARBON-CYCLE ; YUNNAN PROVINCE ; WESTERN YUNNAN ; MANTLE SOURCE ; CLINOPYROXENE PHENOCRYSTS ; ULTRAPOTASSIC MAGMATISM ; PETROGENETIC PROCESSES ; ISOTOPIC CONSTRAINTS ; ZONED CLINOPYROXENE
WOS研究方向Geology
语种英语
WOS记录号WOS:000596477200014
出版者SCIENCE PRESS
源URL[http://ir.iggcas.ac.cn/handle/132A11/99857]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者Cheng ZhiHui
作者单位1.Sun Yat Sen Univ, Sch Earth Sci & Engn, Guangzhou 510275, Peoples R China
2.Tianjin Univ, Inst Surface Earth Syst Sci, Tianjin 300072, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
4.Guangdong Prov Key Lab Geol Proc & Mineral Resour, Guangzhou 510275, Peoples R China
推荐引用方式
GB/T 7714		 Cheng ZhiHui,Yang ZhiJun,Zhao WenBin,et al. Gabbroic xenoliths and glomerocrysts in the post-collisional trachyandestic rocks from Tengchong, SE Tibet: Implications for the magma chamber processes[J]. ACTA PETROLOGICA SINICA,2020,36(7):2127-2148.
APA Cheng ZhiHui.,Yang ZhiJun.,Zhao WenBin.,Zhang MaoLiang.,Lei Ming.,...&Li JuJing.(2020).Gabbroic xenoliths and glomerocrysts in the post-collisional trachyandestic rocks from Tengchong, SE Tibet: Implications for the magma chamber processes.ACTA PETROLOGICA SINICA,36(7),2127-2148.
MLA Cheng ZhiHui,et al."Gabbroic xenoliths and glomerocrysts in the post-collisional trachyandestic rocks from Tengchong, SE Tibet: Implications for the magma chamber processes".ACTA PETROLOGICA SINICA 36.7(2020):2127-2148.

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来源：地质与地球物理研究所

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