| 赣南燕山早期双峰式火山—侵入杂岩的Rb—Sr同位素定年及意义 |
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| 引用本文： | 陈培荣,孔兴功,王银喜,倪琦生,章邦桐,凌洪飞.赣南燕山早期双峰式火山—侵入杂岩的Rb—Sr同位素定年及意义[J].高校地质学报,1999,5(4):378-383. |
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| 作者姓名： | 陈培荣 孔兴功 王银喜 倪琦生 章邦桐 凌洪飞 |
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| 作者单位： | [1]南京大学成矿作用国家重点实验室 [2]南京大学现代分析中心 |
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| 基金项目： | 国家自然科学基金!( 4 9772 110 )，核业总公司华东地质局资助项目 |
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| 摘 要： | 通常认为中国东南大陆中生代时地壳裂解作用发生在燕山晚期。对赣南地区广泛分布的双峰式火山岩和Ａ型花岗岩进行了Ｒｂ－Ｓｒ同位素定年研究，确定基性端元玄武岩的Ｒｂ－Ｓｒ等时线年龄为１７０－１８０Ｍａ，酸性端员流纹岩和Ａ型花岗岩的Ｒｂ－Ｓｒ等时线年龄为１６０－１８０Ｍａ，表明它们形成于中侏罗世早期。由此提出东南太陆中生代时最早的裂解作用应该始于燕山早期。
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| 关 键 词： | 双峰式火成岩 Rb-Sr等时线年龄 燕山早期裂解 赣南 |
| 收稿时间： | 1999-12-20 |
| 修稿时间： | 1999-12-20 |
Rb-Sr ISOTOPIC DATING AND SIGNIFICANCE OF EARLY YANSHANIAN BIMODAL VOLCANIC-INTRUSIVE COMPLEX FROM SOUTH JIANGXI PROVINCE |
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| Chen Peirong,Kong Xinggong,Wang Yinxi,Ni Qisheng,Zhang Bangtong,Ling Hongfei.Rb-Sr ISOTOPIC DATING AND SIGNIFICANCE OF EARLY YANSHANIAN BIMODAL VOLCANIC-INTRUSIVE COMPLEX FROM SOUTH JIANGXI PROVINCE[J].Geological Journal of China Universities,1999,5(4):378-383. |
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| Authors: | Chen Peirong Kong Xinggong Wang Yinxi Ni Qisheng Zhang Bangtong Ling Hongfei |
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| Institution: | 1. State Key Laboratory for Mineral Deposits Research, Nanjing University; 2. Center of Modern Analysis, Nanjing University, Nanjing 210093 |
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| Abstract: | There are many granite bodies and bimodal volcanic sedimentary basins near the Pacific coast in Zhejiang and Fujian Provinces. The Rb-Sr isochron ages of the A type granites and bimodal volcanic rocks range from 90 to 110 Ma. Therefore, it is commonly thought that the Southeast China Continent broke up during late Yanshanian period (Cretaceous). However, there also widely exist bimodal volcanic sedimentary basins and A type granite bodies in south Jiangxi Province. These bimodal rocks are regionally similar to those observed in northeast Guangdong and southwest Fujian Provinces. They generally form an EW trending bimodal volcanic rock belt, extending for more than 200 km. The Rb-Sr isotopic dating on the bimodal volcanic rocks and A type granites show that the Rb-Sr isochron ages of basalts range from 173Ma to 179Ma, rhyolites and A type granites are 165Ma and 176Ma respectively. It is suggested that the rifting took place twice during the Mesozoic era in Southeast China Continent and the earliest rifting occurred in the early Yanshanian period (Jurassic). |
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| Keywords: | bimodal igneous complex Rb-Sr isochron dating early Yanshanian rifting south Jiangxi province |
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