| 桂中都安钾镁煌斑岩金云母~(40)Ar/~(39)Ar年龄及其构造意义 |
| |
| 引用本文： | 王新宇,吴祥珂,何川,时毓,刘希军,付伟,王酉臣.桂中都安钾镁煌斑岩金云母~(40)Ar/~(39)Ar年龄及其构造意义[J].地质通报,2019,38(4):680-688. |
| |
| 作者姓名： | 王新宇 吴祥珂 何川 时毓 刘希军 付伟 王酉臣 |
| |
| 作者单位： | 广西地质矿产勘查开发局, 广西 南宁 530023,广西地质调查院, 广西 南宁 530023,东华理工大学地球科学学院, 江西 南昌 330013,桂林理工大学地球科学学院, 广西 桂林 541006,桂林理工大学地球科学学院, 广西 桂林 541006,桂林理工大学地球科学学院, 广西 桂林 541006,桂林理工大学地球科学学院, 广西 桂林 541006 |
| |
| 基金项目： | 中国地质调查局项目《广西金刚石成矿条件及选区评价》（编号：1212011220514）、广西自然科学基金杰出青年科学基金《岩石地球化学》（编号：2018GXNSFFA281009）和广西科技基地和人才专项（编号：桂科AD17129052） |
| |
| 摘 要： | 右江褶皱带地处扬子陆块和华夏陆块的结合部位,区内广泛发育以基性-超基性岩墙群和超酸性岩脉为主的燕山晚期双峰式岩浆活动。对桂中都安地区的金云钾镁煌斑岩脉进行了金云母~(40)Ar/~(39)Ar法测年,斑晶和基质金云母样品均给出了较一致的坪年龄,分别为93.6±0.6Ma和92.9±0.6Ma,相应的等时线年龄分别为93.4±0.9Ma和92.7±0.8Ma,上述年龄代表了岩脉的侵位年龄。结合区内报道的同期年代学资料,进一步证明右江褶皱带及其周缘晚白垩世双峰式岩浆活动响应了华南地区燕山晚期的构造转换事件及随后大规模的岩石圈伸展减薄。
|
| 关 键 词： | 钾镁煌斑岩 金云母40Ar-39Ar年龄 燕山晚期 岩石圈伸展减薄 华南 |
| 收稿时间： | 2018/5/10 0:00:00 |
| 修稿时间： | 2018/10/16 0:00:00 |
Phlogopite 40Ar/39Ar dating of the lamproite veins in Du'an County, central Guangxi and its tectonic significance |
| |
| WANG Xinyu,WU Xiangke,HE Chuan,SHI Yu,LIU Xijun,FU Wei and WANG Youchen.Phlogopite 40Ar/39Ar dating of the lamproite veins in Du'an County, central Guangxi and its tectonic significance[J].Geologcal Bulletin OF China,2019,38(4):680-688. |
| |
| Authors: | WANG Xinyu WU Xiangke HE Chuan SHI Yu LIU Xijun FU Wei and WANG Youchen |
| |
| Institution: | Guangxi Bureau of Geology & Mineral Prospecting & Exploitation, Nanning 530023, Guangxi, China,Guangxi Geological Survey, Nanning 530023, Guangxi, China,School of Earth Sciences, East China University of Technology, Nanchang 330013, Jiangxi, China,Faculty of Earth Sciences, Guilin University of Technology, Guilin 541006, Guangxi, China,Faculty of Earth Sciences, Guilin University of Technology, Guilin 541006, Guangxi, China,Faculty of Earth Sciences, Guilin University of Technology, Guilin 541006, Guangxi, China and Faculty of Earth Sciences, Guilin University of Technology, Guilin 541006, Guangxi, China |
| |
| Abstract: | The Youjiang Fold Belt is located in the connection region between Yangtze Block and Cathaysia Block. It is characterized by Late Yanshanian bimodal magmatic activities and consists of basic-ultrabasic dyke swarms and ultra-acid rock veins. In this study, the phlogopite 40Ar/39Ar dating of phenocryst and matrix from phlogopite lamproite veins, which are located in the Du'' an County of central Guangxi, yielded two plateau ages of 93.6±0.6Ma, 92.9±0.6Ma and two isochron ages of 93.4±0.9Ma, 92.7±0.8Ma, respectively. These ages are interpreted as the emplacement age for phlogopite lamproite veins. The new results obtained by the authors in junction with the coeval magmatic events further reveal that the voluminous Late Cretaceous bimodal magmatic activities occurred in the Youjiang Fold Belt as well as its peripheral regions in response to the Late Yanshanian tectonic transition and subsequent lithospheric thinning and extension in South China. |
| |
| Keywords: | lamproite phlogopite 40Ar/39Ar age Late Yanshanian lithospheric thinning and extension South China |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《地质通报》浏览原始摘要信息 |
| 点击此处可从《地质通报》下载免费的PDF全文 |
|
