Daxing＇anling （大兴安岭） area is one of the regions that Phanerozoic granites are extremely developed in NW China. At present, the Hercynian granitoid research lags behind the Mesozoic granitoid research. In this a...Daxing＇anling （大兴安岭） area is one of the regions that Phanerozoic granites are extremely developed in NW China. At present, the Hercynian granitoid research lags behind the Mesozoic granitoid research. In this article, we have taken systematic petrochemistry and geochronology researches on the Hercynian granitoids in Daitongshan （代铜山） copper deposit and Lamahanshan （喇嘛罕山） silver poly- metallic deposit, which were located at southern section of Daxing＇anling metallogenic belt. Zircon SHRIMP U-Pb dating results show that, the granite aplites in Daitongshan and the gneissic granites inLamahanshan were formed at （265±5）-（268±9） Ma and （252±2）-（252.6±3.4） Ma, respectively, which were both the products of late Herynian tectonic-magmatic events. Samples from Lama- hanshan are characterized by high SiO2 （69.72 wt.%-74.65 wt.%）, high potassium （3.53 wt.%-4.55 wt.%） and low P205 （0.03 wt.%0.12 wt.%）, aluminum saturation index （A/CNK） range from 0.95 to 0.98, Rb, Nd and K are en- riched, whereas the elements such as Nb, Ta, P and Ti are depleted, which belong to I-type grani- toids. Characteristics of samples from Daitong- shan are similar to H-type granitoids. The magmasource may be mostly originated from the lithospheric mantle component which were transformated or affected by the subduction components, and its formation may be closely related with the subduction and orogenesis of the Paleo-Asian Ocean.展开更多
大兴安岭中南段有色金属成矿带位于天山-兴蒙造山带东部贺根山断裂与西拉沐伦河断裂之间,是兴蒙造山带的重要组成部分(刘建明等,2001)。大地构造位置处于古亚洲洋成矿域与环太平洋成矿域的叠加部位(Zeng et al.,2013,2015)。复杂的区域...大兴安岭中南段有色金属成矿带位于天山-兴蒙造山带东部贺根山断裂与西拉沐伦河断裂之间,是兴蒙造山带的重要组成部分(刘建明等,2001)。大地构造位置处于古亚洲洋成矿域与环太平洋成矿域的叠加部位(Zeng et al.,2013,2015)。复杂的区域构造、岩浆演化历史形成了该区丰富和颇具特色的矿产资源,特别是银铅锌矿床(张德全等,1994;Zeng et al.,2011;Ouyang et al.,2014)。展开更多
基金supported by the China Geological Survey(Nos.1212011085260,12120113093600)the Basic Project of Central Public Research Institutes(No.K1314)the Important Mineral Resource Potential Evaluation of Inner Mongolia and Regional Metallogenic Regularity Research Project(No.2006-02-YS01)
文摘Daxing＇anling （大兴安岭） area is one of the regions that Phanerozoic granites are extremely developed in NW China. At present, the Hercynian granitoid research lags behind the Mesozoic granitoid research. In this article, we have taken systematic petrochemistry and geochronology researches on the Hercynian granitoids in Daitongshan （代铜山） copper deposit and Lamahanshan （喇嘛罕山） silver poly- metallic deposit, which were located at southern section of Daxing＇anling metallogenic belt. Zircon SHRIMP U-Pb dating results show that, the granite aplites in Daitongshan and the gneissic granites inLamahanshan were formed at （265±5）-（268±9） Ma and （252±2）-（252.6±3.4） Ma, respectively, which were both the products of late Herynian tectonic-magmatic events. Samples from Lama- hanshan are characterized by high SiO2 （69.72 wt.%-74.65 wt.%）, high potassium （3.53 wt.%-4.55 wt.%） and low P205 （0.03 wt.%0.12 wt.%）, aluminum saturation index （A/CNK） range from 0.95 to 0.98, Rb, Nd and K are en- riched, whereas the elements such as Nb, Ta, P and Ti are depleted, which belong to I-type grani- toids. Characteristics of samples from Daitong- shan are similar to H-type granitoids. The magmasource may be mostly originated from the lithospheric mantle component which were transformated or affected by the subduction components, and its formation may be closely related with the subduction and orogenesis of the Paleo-Asian Ocean.
文摘大兴安岭中南段有色金属成矿带位于天山-兴蒙造山带东部贺根山断裂与西拉沐伦河断裂之间,是兴蒙造山带的重要组成部分(刘建明等,2001)。大地构造位置处于古亚洲洋成矿域与环太平洋成矿域的叠加部位(Zeng et al.,2013,2015)。复杂的区域构造、岩浆演化历史形成了该区丰富和颇具特色的矿产资源,特别是银铅锌矿床(张德全等,1994;Zeng et al.,2011;Ouyang et al.,2014)。
