| 赣南东坑盆地早侏罗世侵入岩的锆石SHRIMP测年——兼论赣南粤北地区成岩后期构造热事件 |
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| 引用本文： | 余心起,吴淦国,狄永军,邱骏挺,周翔.赣南东坑盆地早侏罗世侵入岩的锆石SHRIMP测年——兼论赣南粤北地区成岩后期构造热事件[J].岩石学报,2010,26(12):3469-3484. |
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| 作者姓名： | 余心起 吴淦国 狄永军 邱骏挺 周翔 |
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| 作者单位： | 中国地质大学地质过程与矿产资源国家重点实验室,北京,100083 |
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| 基金项目： | 本文受国家自然科学基金项目(40772134)资助. |
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| 摘 要： | 在确定粤北霞岚杂岩形成于早侏罗世的基础上,本文报道了赣南东坑盆地含湖杂岩和临江盆地玄武岩的SHRIMP锆石U-Pb年龄。含湖杂岩由正长岩、花岗闪长岩和辉长辉绿岩组成,SHRIMP锆石U-Pb年龄值花岗闪长岩193±2Ma,混有正长岩的辉长辉绿岩196±1Ma,属于早侏罗世产物。野外可见花岗闪长岩中正长岩包体与基性岩包体共存、以及基性成分渗入正长岩包体中的现象,可能表明存在多次结晶作用。含湖以东约8km处的花岗斑岩186±3Ma。临江盆地的玄武岩则有2570Ma、1730Ma、800Ma、430Ma、190Ma等多期多组捕获锆石的年龄,最迟为早侏罗世,但不能与含湖杂岩构成燕山早期的双峰式火成岩组合。多组~195Ma的火成岩表明,早侏罗世中国东南部岩浆活动间歇期可能时间不长,即印支期的挤压在早侏罗世已经转向伸展垮塌,或者即将开始从特提斯构造域向太平洋构造域的转换。对赣南东坑盆地含湖杂岩和粤北霞岚杂岩钾长石的40Ar/39Ar测年结果为132~137Ma之间,表明中国东南部受到太平洋板块俯冲带后退引起的后缘扩张和动力学背景从挤压到拉张的构造转换事件影响,及由此所引发的大面积火成岩对早期火成岩成岩后期构造热事件扰动。这一认识可以促进对赣南粤北地区早侏罗世构造属性及其后续构造演化的深入研究。
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| 关 键 词： | SHRIMP年龄 40Ar/39Ar测年 早侏罗世 岩浆活动 构造热事件 赣南粤北地区 |
| 收稿时间： | 2009/6/17 0:00:00 |
| 修稿时间： | 5/8/2010 12:00:00 AM |
SHRIMP zircon U-Pb dating of the Early Jurassic magmatic rocks in Dongkeng basin, South Jiangxi Province, and the later tectono-thermal events in southern Jiangxi and northern Guangdong provinces. |
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| YU XinQi,WU GanGuo,DI YongJun,QIU JunTing and ZHOU Xiang.SHRIMP zircon U-Pb dating of the Early Jurassic magmatic rocks in Dongkeng basin, South Jiangxi Province, and the later tectono-thermal events in southern Jiangxi and northern Guangdong provinces.[J].Acta Petrologica Sinica,2010,26(12):3469-3484. |
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| Authors: | YU XinQi WU GanGuo DI YongJun QIU JunTing and ZHOU Xiang |
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| Institution: | State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China |
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| Abstract: | |
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| Keywords: | SHRIMP zircon U-Pb ages 40Ar/39Ar dating Early Jurassic Magmatism Tectono-magmatic events southern Jiangxi and northern Guangdong areas |
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