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| 安徽铜陵新屋里岩体黑云母、斜长石40Ar-39Ar年龄及其地质意义 | |
| 引用本文： | 王永磊,裴荣富,王浩琳,瞿泓滢,李进文.安徽铜陵新屋里岩体黑云母、斜长石40Ar-39Ar年龄及其地质意义[J].高校地质学报,2012,18(1):150-157. |
| 作者姓名： | 王永磊 裴荣富 王浩琳 瞿泓滢 李进文 |
| 作者单位： | 1. 中国地质科学院 矿产资源研究所，国土资源部 成矿作用与资源评价重点开放实验室，北京 100037；; 2. 内生金属矿床成矿机制研究国家重点实验室（南京大学），南京 210093 |
| 摘 要： | 通过对凤凰山铜矿床新屋里岩体的黑云母、斜长石单矿物进行阶段加热法40Ar-39Ar 定年，获得石英二长闪长岩中黑 云母及斜长石坪年龄分别为（152.1±1.7）Ma 和（135±1）Ma，花岗闪长岩中黑云母及斜长石坪年龄分别为（143.8±0.9） Ma 和（140.4±0.9）Ma，反映了长江中下游地区燕山期岩浆活动的一个重要阶段。石英二长闪长岩中黑云母的40Ar-39Ar年 龄显著高于前人的锆石U-Pb 年龄，可能为含过剩Ar 的结果。结合已知年龄资料，作出新屋里岩体不同单元的冷却曲线， 显示新屋里岩体在晚侏罗世的冷却速率很大，暗示当时处于一种伸展的构造背景之下，其形成可能与中国东部中生代晚期 的岩石圈减薄事件有关。 |
| 关 键 词： | 新屋里岩体 Ar-Ar 冷却曲线 安徽铜陵 凤凰山铜矿床 |
| 修稿时间： | 2011-10-09 |
40Ar-39Ar Plateau Ages of Biotite and Plagioclase from Xinwuli Granitoids in Tongling Area,Anhui Province and its Geological Significance |
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| Wang Yonglei,Pei Rongfu,Wang Haolin,Qu Hongying,Li Jinwen.40Ar-39Ar Plateau Ages of Biotite and Plagioclase from Xinwuli Granitoids in Tongling Area,Anhui Province and its Geological Significance[J].Geological Journal of China Universities,2012,18(1):150-157. | |
| Authors: | Wang Yonglei Pei Rongfu Wang Haolin Qu Hongying Li Jinwen |
| Institution: | 1. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological; Sciences, Beijing 100037; 2. State Key Laboratory for Mineral Deposits Research (Nanjing University), Nanjing 210093, China |
| Abstract: | Biotite and plagioclase samples from the quartz monzodiorite of Xinwuli granitoids yield 40Ar-39Ar plateau ages of 152.1±1.7 and 135±1 Ma. Samples from the granodiorite give 40Ar-39Ar plateau ages of 143.8±0.9 Ma and 140.4±0.9 Ma. The similar ages suggest an important stage of Yanshanian magmatic activity in the Middle and Lower Yangtze regions. The 40Ar-39Ar age of biotite from quartz monzodiorite is older than the previous zircon U-Pb isotopic ages, which is probably due to excess argon. Together with the age data of Xinwuli granitoids， we obtain the cooling curves of the granodiorite and quartz monzodiorite. The cooling curves show that the cooling rates of Xinwuli granitoids have been fast since the Late Jurassic, indicating an extensional tectonism. The formation of Xinwuli granitoids may be related to the Late Mesozoic lithosphere thinning in Eastern China. |
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