Zircon U-Pb age of the monzogranite from the middle segment of the Qaidam Mountain composite granite on the south margin of the Qilian Mountain
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摘要: 文章对祁连地块南缘柴达木山复式岩体中部的似斑状二长花岗岩以及二长花岗岩进行了详细的岩石学、地球化学及锆石U-Pb年代学研究,结果表明似斑状二长花岗岩为富钾弱过铝质S型花岗岩,是杂砂岩在温度约820℃,压力0.8~0.9Gpa的条件下,经黑云母脱水引发部分熔融形成,形成于同碰撞环境,时代为(456.2±3)Ma;二长花岗岩为富钾准铝质S型花岗岩,是砂泥质沉积岩在温度约750℃,压力<0.8Gpa的条件下,经白云母脱水引发部分熔融形成,形成于伸展背景下,时代为(437.2±1.5)Ma。结合前人的研究成果,认为柴达木山复式岩体是一个挤压到伸展等多种构造体制下形成的岩体。Abstract: Based on integrated studies of petrography, geochemical and geochronology of the porphyritic monzogranite and monzogranite from the middle segment of the Qaidam Mountain composite granite, the authors hold that the porphyritic monzogranite is a K-rich peraluminous S-type granite formed by the biotite partial melting of greywacke under the condition of higher pressure (0.8-0.9 Gpa) and temperature (about 820℃), and resulted from continent-continent collision in (456.2±3) Ma; The monzogranite is a K- rich metaluminous S- type granite, which was formed by the muscovite partial melting of meta politicarenaceous sedimentary rocks under the condition of lower pressure (<0.8 Gpa) and temperature (about 750℃), and was formed in an extension geological setting in (437.2 ± 1.5) Ma. Combined with the results of previous studies, the authors consider that the Qaidam Mountain composite granite was formed in a complex plate tectonic system which transformed from contraction to extension.
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Keywords:
- Qilian massif /
- North Qaidam /
- Qaidam Mountain /
- LA-ICP-MS U-Pb dating
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