| 祁漫塔格韧性剪切带中绢云母40Ar-39Ar定年及地质意义 |
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| 引用本文： | 郭通珍,谈生祥,常革红,丁玉进,张志青.祁漫塔格韧性剪切带中绢云母40Ar-39Ar定年及地质意义[J].西北地质,2012,45(1):94-101. |
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| 作者姓名： | 郭通珍 谈生祥 常革红 丁玉进 张志青 |
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| 作者单位： | 1. 青海省地质调查院,青海省青藏高原北部地质过程与矿产资源重点实验室,青海西宁810012
2. 青海省国土资源厅,青海西宁,810001 |
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| 基金项目： | 中国地质调查局项目“青海1∶5万乌兰乌珠尔—祁漫塔格地区八幅区域地质调查”(1212010610312) |
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| 摘 要： | 祁漫塔格韧性剪切带是祁漫塔格蛇绿混杂岩带与北昆仑岩浆弧的区域主构造边界,对剪切带内花岗质糜棱岩中绢云母40Ar-39 Ar法年龄测定,获得了(271.1±2.2) Ma的坪年龄,相应的36Ar/40 Ar-39 Ar/40 Ar反等时线年龄为(270.5±3.7)Ma (MSWD=2.7),39Ar/36 Ar-40 Ar/35 Ar正等时线年龄为(270.9±4.7) Ma (MSWD=0.22);坪年龄(271.1±2.2) Ma接近于绢云母矿物的形成年龄,也代表了祁漫塔格韧性剪切带的形成年龄.通过韧性剪切变形带内运动学特征的研究,表明剪切带具有右旋斜冲的性质.祁漫塔格韧性剪切带的形成与古特提斯洋的俯冲作用有关,是古特提斯洋向北俯冲造山过程的远程效应.
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| 关 键 词： | 祁漫塔格韧性剪切带 花岗质糜棱岩 绢云母 40Ar-39Ar年龄 |
40Ar-39Ar Dating of the Muscovite in the Sericite of the Qimantage Ductile Shear Zone and Its Geological Significance |
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| GUO Tong-zhen
,
TAN Sheng-xiang
,
CHANG Ge-houg
,
DING Yu-jin
,
ZHANG Zhi-qing.40Ar-39Ar Dating of the Muscovite in the Sericite of the Qimantage Ductile Shear Zone and Its Geological Significance[J].Northwestern Geology,2012,45(1):94-101. |
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| Authors: | GUO Tong-zhen TAN Sheng-xiang CHANG Ge-houg DING Yu-jin ZHANG Zhi-qing |
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| Institution: | 1(1.Qinghai Institute of Geological Survey/Qinghai Province Key Laboratory of Geological Processes and Mineral Resources of Northern Qinghai-Tibetan Plateau,Xining 810012,China;2.Qinghai Province Department of Land and Resources,Xining 810001,China) |
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| Abstract: | Qimantage ductile shear zone is the main tectonic boundary of Qimantage ophiolite belt and North Kunlun magmatic arc,we determine granitic mylonite in shear zone with sericite 40Ar-39Ar methods.Plateau age is 271.1±2.2Ma,36Ar/40Ar-39Ar/40Ar reverse-isochron curve age is 270.5±3.7 Ma（MSWD=2.7）,and 39Ar/36Ar-40Ar/36Ar isochron age is 270.9±4.7Ma（MSWD=0.22）.Plateau age 271.1±2.2Ma close to the age of mineral formation of sericite,it represents the formation age of Qimantage ductile shear zone.Through the ductile shear zone within the kinematic characteristics,dextral shear zone has the nature of Oblique filling.The formation of Qimantage ductile shear zone related Paleo-Tethys Ocean Subduction,is the remote effects of the process of Paleo-Tethys Ocean Northward subduction orogeny. |
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| Keywords: | Qimantage ductile shear zone granitic mylonite sericite 40Ar-39Ar age |
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