| 大兴安岭多宝山晚三叠世双峰式侵入岩年代学及地球动力学背景 |
| |
| 引用本文： | 刘宝山,程招勋,钱程,张春鹏,钟辉,韩仁萍.大兴安岭多宝山晚三叠世双峰式侵入岩年代学及地球动力学背景[J].地球科学,2021,46(7):2311-2328. |
| |
| 作者姓名： | 刘宝山 程招勋 钱程 张春鹏 钟辉 韩仁萍 |
| |
| 作者单位： | 中国地质调查局沈阳地质调查中心,辽宁沈阳 110034;黑龙江省自然资源调查院,黑龙江哈尔滨 150036 |
| |
| 基金项目： | 国家重点研发计划项目“典型矿集区三维地质结构与矿体定位”2017YFC0601305中国地质调查局地质调查项目DD20190156黑龙江省1∶5万矿调成果综合研究及找矿靶区优选项目GY[2018]003 |
| |
| 摘 要： | 多宝山矿区发现有侵位于晚奥陶世花岗闪长岩的角闪辉长岩和英云闪长岩，二者具有双峰式侵入岩的特征，在详细的野外地质调查基础上，对多宝山双峰式侵入岩进行了岩石学、年代学、地球化学方面的研究，并初步探讨其构造意义.角闪辉长岩的LA-ICP-MS锆石U-Pb年龄为224.3±1.7 Ma，英云闪长岩为226.3±2.3 Ma，两者形成于同一构造岩浆作用事件；侵入岩的SiO2含量呈双峰式，稀土、微量元素特征表明它们具有岛弧岩浆特征，二者具有相同的岩石圈地幔源区，其源区可能受到了俯冲流体交代作用的影响.结合区域构造背景，认为其形成与鄂霍茨克洋壳俯冲有关，产于活动大陆边缘环境，它们可能是受地壳混染的OIB型玄武质岩浆在地壳中部的一个“双扩散”岩浆房通过结晶分异形成的.
|
| 关 键 词： | 双峰式侵入岩 晚三叠世 岛弧 大兴安岭 多宝山 构造地质 |
| 收稿时间： | 2020-07-20 |
Geochronology and Geodynamic Background Study of the Late Triassic Bimodal Pattern Intrusive Rock in Da Hinggan Mountains Duobaoshan Area |
| |
| Liu Baoshan,Cheng Zhaoxun,Qian Cheng,Zhang Chunpeng,Zhong Hui,Han Renping.Geochronology and Geodynamic Background Study of the Late Triassic Bimodal Pattern Intrusive Rock in Da Hinggan Mountains Duobaoshan Area[J].Earth Science-Journal of China University of Geosciences,2021,46(7):2311-2328. |
| |
| Authors: | Liu Baoshan Cheng Zhaoxun Qian Cheng Zhang Chunpeng Zhong Hui Han Renping |
| |
| Abstract: | Hornblende gabbro and tonalite which emplaced in Late Ordovician granodiorite were found in Duobaoshan mining area, possessed the characteristics of bimodal pattern intrusive rock.On the basis of detailed field geological survey, we reaserched the petrology, geochronology and geochemistry characteristics of bimodal pattern intrusive rock, and discuss their tectonic significance. The LA-ICP-MS zircon U-Pb ages of hornblende gabbro is 224.3±1.7 Ma, the LA-ICP-MS zircon U-Pb ages of tonalite is 226.3±2.3 Ma, they were both formed by the same tectonic magmatism.The SiO2 content of intrusive rock is bimodal, their rare earth elements and microelements indicates the characteristics of island arc magma.They have the same mantle source, which influenced by the subduction metasomatic alteration of fluids. Based on analysis of the regional tectonic background, its formation is related to the Okhotsk subduction. The gabbro and tonalite which formed in the active continental margin environment, were interpreted to be formed through assimilation of OIB-type basaltic magma followed by fractional crystallization in a.double diffusive'magma chamber at the middle crust level. |
| |
| Keywords: | |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《地球科学》浏览原始摘要信息 |
| 点击此处可从《地球科学》下载免费的PDF全文 |
|
