内蒙古阿拉善左旗巴音诺尔公花岗岩体TIMS锆石U-Pb年龄
Times zircon U-Pb age of Bayinnuoergong granite pluton of Alxa Block, Inner Mongolia
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摘要: 内蒙古自治区阿拉善东南部的巴音诺尔公花岗岩体,地处华北陆块西北缘,霍尔森-查干楚鲁构造带以南的雅布赖-巴音诺尔公构造带内。岩体整体上受NEE向构造控制,主要由中-细粒黑云母花岗岩和中-粗粒似斑状黑云母花岗岩2种岩石类型组成。采用TIMS锆石U-Pb定年法,测得巴音诺尔公岩体不同位置中-细粒黑云母花岗岩和中-粗粒似斑状黑云母花岗岩样品年龄分别为304.7±2.8Ma和289.0±3.8Ma,属于晚石炭世-早二叠世。结合前人资料,提出巴音诺尔公岩体至少存在2期岩浆活动,分别为晚石炭世(304Ma)和早二叠世(289~272Ma)。Abstract: The Bayinnuoergong granite pluton in the southeast of Alxa Block is located to the northwest of North China Craton and distrbuted in Yabula-Bayinnuoergong tectonic belt in the south of Huoershen-Chaganchulu tectonic belt, controlled generally by NEE-trending structure. It consists of medium to fine grained biotite granite and medium to coarse porphyritic biotite granite. Re-searchers have done some research on the ages of the Bayinnuoergong granite, which provides a favorable condition for analyzing and discussing whether the Bayinnuoergong intrusion formed in multiperiodic magmatic activities. TIMS U-Pb dating of zircons from the Bayinnuoergong medium to fine grained biotite granite and medium to coarse porphyritic biotite granite yielded two ages of 304.7±2.8Ma and 289.0±3.8Ma, respectively, indicating that the pluton should be the Late Carboniferous-Early Permain intrusion. Combined with the previous research in the study area, it is held that there are at least two magmatic activities in this area, which oc-curred in Late Carboniferous (304Ma) and Early Permian (289~272Ma).
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Key words:
- Alxa /
- Bayinnuoergong /
- Late Carboniferous-Early Permian /
- TIMS zircon U-Pb dating
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