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Magma chamber-related transition from magmatic to solid-state fabrics within the Late Triassic granitic Dushan pluton (North China)

文献类型：期刊论文

作者Qiu, Huabiao1,2,3,4; Lin, Wei1,2; Chen, Yan3; Faure, Michel3; Meng, Lingtong1,2; Ren, Zhiheng1,2; Zeng, Jipei1,2; Hou, Quanlin1
刊名GEOPHYSICAL JOURNAL INTERNATIONAL
出版日期2021-11-01
卷号227期号:2页码:759-775
ISSN号0956-540X
关键词Magnetic fabrics and anisotropy Magnetic mineralogy and petrology Microstructures Magma chamber processes Pluton emplacement
DOI10.1093/gji/ggab252
英文摘要Penetrative petro-fabrics in plutons, particularly late-stage solid-state fabrics, are usually considered to record regional tectonism. However, these fabrics are fundamentally ambiguous to correlate with magma-chamber processes or regional tectonics. Understanding the processes of fabric formation requires a proper understanding of pluton formation and emplacement mechanism. In this paper, we provide a case study of a transition from magma chamber-related magmatic to solid-state fabrics within the Late Triassic granitic Dushan pluton (North China) based on a multidisciplinary investigation of its emplacement mechanism, including structural geology, isotope chronology, anisotropy of magnetic susceptibility data measurement and gravity modelling. The Dushan pluton varies in a southwest direction from a megascopically isotropic monzogranite in the northeast to an arc-shaped gneissic monzogranite with locally mylonitic zones along the southwest margin. The compatible outward dipping mesoscopic and magnetic susceptibility foliations define a dome-like roof with an NE-SW long axis. Considering the absence of similar penetrative fabrics in the country rocks, a continuum of magma chamber-related fabric variations within the pluton, from magmatic to solid-state conditions, probably formed during pluton emplacement. Gravity modelling suggests that the Dushan pluton has an NE-SW trending tongue-like shape with a northeast positioned root. We propose a model in which the Dushan pluton was emplaced through a northeast feeder zone, beginning probably as a sill then evolving by inflation via several magma batches. Later magma batches inflated the country rocks to form the final pluton. Magma inflation deformed the former semi-solid magma, forming a curved gneissic to mylonitic foliation along the southwest margin of the pluton. Several multidisciplinary studies show that the North China Craton experienced a Late Triassic regional crustal extension attending the Dushan pluton emplacement. Both mesoscopic and magnetic susceptibility fabrics of the pluton could be more related to magmatic process rather than regional tectonics, implying that such fabrics within plutons need to be used with caution for inferring regional tectonics.
WOS关键词MAGNETIC-SUSCEPTIBILITY ; ANISOTROPY ; AMS ; PETROGENESIS ; EMPLACEMENT ; MASSIF ; CRATON ; SHAPE ; DEFORMATION ; TECTONICS
资助项目National Key Research and Development Program of China[2016YFC0600102] ; National Natural Science Foundation of China[91855212] ; National Natural Science Foundation of China[91755205] ; LABEX VOLTAIRE[ANR-10-LABX-100-01] ; EQUIPEX PLANEX[ANR-11-EQPX-0036]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者OXFORD UNIV PRESS
WOS记录号WOS:000684120300003
资助机构National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; LABEX VOLTAIRE ; LABEX VOLTAIRE ; EQUIPEX PLANEX ; EQUIPEX PLANEX ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; LABEX VOLTAIRE ; LABEX VOLTAIRE ; EQUIPEX PLANEX ; EQUIPEX PLANEX ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; LABEX VOLTAIRE ; LABEX VOLTAIRE ; EQUIPEX PLANEX ; EQUIPEX PLANEX ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; LABEX VOLTAIRE ; LABEX VOLTAIRE ; EQUIPEX PLANEX ; EQUIPEX PLANEX
源URL[http://ir.iggcas.ac.cn/handle/132A11/101902]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Lin, Wei
作者单位1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
3.Univ Orleans, CNRS, BRGM, ISTO,UMR 7327, F-45071 Orleans, France
4.SINOPEC, Petr Explorat & Prod Res Inst, Beijing 100083, Peoples R China
推荐引用方式
GB/T 7714		 Qiu, Huabiao,Lin, Wei,Chen, Yan,et al. Magma chamber-related transition from magmatic to solid-state fabrics within the Late Triassic granitic Dushan pluton (North China)[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2021,227(2):759-775.
APA Qiu, Huabiao.,Lin, Wei.,Chen, Yan.,Faure, Michel.,Meng, Lingtong.,...&Hou, Quanlin.(2021).Magma chamber-related transition from magmatic to solid-state fabrics within the Late Triassic granitic Dushan pluton (North China).GEOPHYSICAL JOURNAL INTERNATIONAL,227(2),759-775.
MLA Qiu, Huabiao,et al."Magma chamber-related transition from magmatic to solid-state fabrics within the Late Triassic granitic Dushan pluton (North China)".GEOPHYSICAL JOURNAL INTERNATIONAL 227.2(2021):759-775.

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来源：地质与地球物理研究所

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