| Forceful Emplacement of Granitic Plutons in an Extensional Tectonic Setting:Syn-kinematic Plutons in the Yagan-Onch Hayrhan Metamorphic Core Complex |
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| 作者姓名： | WANG Tao ZHENG Yadong LI Tianbing GAO Yongjun and MA Mingbo |
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| 作者单位： | WANG Tao，ZHENG Yadong，LI Tianbing，GAO Yongjun and MA Mingbo Department of Geology，Peking University，Beijing 100871，Geological Survey of Ningxia Hui Autonomous Region，Yinchuan 750021 |
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| 摘 要： | It is generally considered that granitic plutons are forcefully emplaced in a compressional setting and permissively emplaced in an extensional setting. This paper, however, shows that syn-kinematic (extensional) elliptic granitic plutons in the Yagan-Onch Hayrhan metamorphic core complex (MCC) have relatively strong forceful emplacement, which are indicated by (1) concentric distribution of the rock units, (2) a strain pattern with strong strains on the margins and low strains at the centre of a pluton, and particularly (3) syn-emplacement shortening of the host rocks within the aureole. The strain analysis for the host rocks shows that the host-rock ductile shortening, i.e. forceful emplacement, provides about 16-24% of the emplacement space for the present plutons. All these suggest that forceful emplacement occurs not only in a compressional tectonic setting, but also in an extensional setting. This study further demonstrates the significance of the multiple emplacement of granitic plutons and provi
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Forceful Emplacement of Granitic Plutons in an Extensional Tectonic Setting: Syn-kinematic Plutons in the Yagan-Onch HayrhanMetamorphic Core Complex |
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| Authors: | WANG Tao ZHENG Yadong LI Tianbing GAO Yongjun and MA Mingbo |
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| Institution: | WANG Tao,ZHENG Yadong,LI Tianbing,GAO Yongjun and MA Mingbo Department of Geology,Peking University,Beijing,Geological Survey of Ningxia Hui Autonomous Region,Yinchuan |
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| Abstract: | It is generally considered that granitic plutons are forcefully emplaced in a compressional setting and permissively emplaced in an extensional setting. This paper, however, shows that syn-kinematic (extensional) elliptic granitic plutons in the Yagan-Onch Hayrhan metamorphic core complex (MCC) have relatively strong forceful emplacement, which are indicated by (1) concentric distribution of the rock units, (2) a strain pattern with strong strains on the margins and low strains at the centre of a pluton, and particularly (3) syn-emplacement shortening of the host rocks within the aureole. The strain analysis for the host rocks shows that the host-rock ductile shortening, i.e. forceful emplacement, provides about 16-24% of the emplacement space for the present plutons. All these suggest that forceful emplacement occurs not only in a compressional tectonic setting, but also in an extensional setting. This study further demonstrates the significance of the multiple emplacement of granitic plutons and provides new information about the causality between granitic magmatism and the formation of the MCC and its dynamics. |
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| Keywords: | granitic pluton forceful emplacement extension Yagan-Onch Hayrhan |
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