| 新疆且末阿尔金断裂南缘斜长片麻岩锆石U-Pb测年及其地质意义 |
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| 引用本文： | 宋卫卫,黄建华,王焕志,张峰,陈传浩,张中欣.新疆且末阿尔金断裂南缘斜长片麻岩锆石U-Pb测年及其地质意义[J].山东国土资源,2020,36(2):12-16. |
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| 作者姓名： | 宋卫卫 黄建华 王焕志 张峰 陈传浩 张中欣 |
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| 作者单位： | 中化地质矿山总局山东地质勘查院,烟台市自然资源和规划局,中化地质矿山总局山东地质勘查院,中化地质矿山总局山东地质勘查院,中化地质矿山总局山东地质勘查院,中化地质矿山总局山东地质勘查院 |
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| 基金项目： | 新疆维吾尔自治区地质勘查基金项目管理中心项目,新疆且末县米特河一带1∶5万四幅区域地质矿产调查(K16-1-LQ14)。 |
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| 摘 要： | 在阿尔金地块南缘构造混杂岩带中,新发现了多个规模较大的斜长片麻岩块体。运用LA-ICP-MS锆石U-Pb定年分析方法,对阿尔金地块南缘且末大石门地区构造混杂岩带中的斜长片麻岩进行了年代学测定,并初步探讨其地质意义。30个锆石颗粒的28个有效测点,测出的年龄明显分为2个区间:①(1784±41)^(2150±34)Ma之间,加权平均值为(2130±27)Ma(MSWD=0.21,1σ);②(2324±32)^(2684±51)Ma之间,加权平均值为(2520±23)Ma(MSWD=0.06,1σ)。根据该次年龄测试结果和区域调查资料表明,阿尔金地块南缘且末大石门地区,在古元古代存在一期构造-热事件,该期事件与吕梁运动的时限相吻合。
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| 关 键 词： | 混杂岩带 锆石U-Pb定年 斜长片麻岩 且末地区 阿尔金群 新疆 |
Zircon UPb Dating and Its Geological Significance of Plagioclase Gneiss in the South Margin of Altun Fault in Qiemo County in Xinjiang Uygur Autonomous Region |
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| SONG Weiwei,HUANG Jianhu,WANG Huanzhi,ZHANG Feng,CHEN Chuanhao and ZHANG Zhongxin.Zircon UPb Dating and Its Geological Significance of Plagioclase Gneiss in the South Margin of Altun Fault in Qiemo County in Xinjiang Uygur Autonomous Region[J].Land and Resources in SHANDONG Province,2020,36(2):12-16. |
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| Authors: | SONG Weiwei HUANG Jianhu WANG Huanzhi ZHANG Feng CHEN Chuanhao and ZHANG Zhongxin |
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| Institution: | (Shandong Geological Exploration Institute of Sinochem Bureau of Geology and Mines,Shandong Ji'nan 250013,China;Yantai Natural Resources and Planning Bureau,Shandong Yantai 264003,China) |
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| Abstract: | In the structural melange belt in the south margin of Altun,several large-scale plagioclase gneiss blocks have been found.By using LAICP-MS zircon U-Pb dating method,the chronology of plagioclase gneiss in the tectonic melange belt in the south margin of Altun and Dashimen area has been determined,and its geological significance has been discussed preliminarily.28 effective sites of 30 zircon grains can be divided into two distinct intervals:one is between(1784±41)2150±34Ma,and the weighted average value is(2130±27)Ma(MSWD=0.21,1σ),the other is between(2324±32)2684±51Ma,and the weighted average value is(2520±23)Ma(MSWD=0.06,1σ).According to regional geological data,plagioclase gneiss blocks are derived from the Altun group.According to the results of this age test and regional survey data,there is a tectonic thermal event in Paleoproterozoic in the south margin of Altun and the last Dashimen area,which is agreement with the time limit of Lvliang movement. |
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| Keywords: | Melange belt zircon U Pb dating plagioclase gneiss Altun group Qiemo county Xinjiang Uygur Autonomous Region |
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