| 新疆阿尔泰萨尔朔克金多金属矿区岩浆活动—剪切变形时限——锆石U-Pb和绢云母~(40)Ar/~(39)Ar测年证据 |
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| 引用本文： | 杨成栋,杨富全,吴玉峰.新疆阿尔泰萨尔朔克金多金属矿区岩浆活动—剪切变形时限——锆石U-Pb和绢云母~(40)Ar/~(39)Ar测年证据[J].地质论评,2016,62(3):631-648. |
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| 作者姓名： | 杨成栋 杨富全 吴玉峰 |
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| 作者单位： | 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实验室，北京，100037;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实验室，北京，100037;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实验室，北京，100037 |
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| 基金项目： | 本文为国家自然科学基金资助项目（编号：41272103）和“十二五”国家科技支撑计划项目（编号：2011BAB06B03 02）的成果。 |
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| 摘 要： | 萨尔朔克金多金属矿位于新疆阿尔泰南缘阿舍勒盆地,矿体赋存于沿火山通道充填的潜火山岩(流纹斑岩)中,矿化类型较为多样,主要呈浸染状、脉状和细脉状产出,矿床的形成与潜火山热液密切相关。该矿区外围广泛发育无明显矿化的流纹斑岩,且普遍发育韧性剪切变形现象,流纹斑岩和韧性剪切变形的时限都不明确,严重制约着外围找矿勘查工作的进展。本文在详细的野外地质调查和室内镜下鉴定的基础上,应用LA-ICP-MS锆石U-Pb和绢云母~(40)Ar/~(39)Ar测年方法对外围的流纹斑岩和韧性剪切带中的糜棱岩进行了年代学研究。获得无明显矿化的流纹斑岩的年龄为371.3±1.2 Ma,结合课题组对矿化流纹斑岩的年代学研究成果,表明流纹斑岩形成于382~371 Ma之间,但主成矿作用只发生在中泥盆世晚期,371 Ma可能代表了阿舍勒组最晚期岩浆侵入活动事件,但没有伴随矿化作用。绢云母在糜棱岩中沿剪切面理分布,属于韧性剪切变形的新生矿物,其坪年龄为254.4±1.8 Ma,与等时线年龄(254.0±3.7 Ma)在误差范围内一致,代表了新生绢云母的形成年龄,暗示该韧性剪切带形成时间为晚二叠世末期,为额尔齐斯区域大规模剪切—走滑活动之后的局部剪切活动;该韧性剪切作用只对矿化进行了改造,并没有富集成矿。
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| 关 键 词： | 锆石U-Pb定年 绢云母40Ar/39Ar测年 阿舍勒盆地 萨尔朔克 新疆 |
| 收稿时间： | 2015/5/24 0:00:00 |
| 修稿时间： | 4/8/2016 12:00:00 AM |
Timing of Magmatic Activity-Shearing Deformation from the Sarsuk Polymetallic Gold Deposit on the Southern Margin of Altay, Xinjiang:Constraints from Zircon U Pb and Sericite 40Ar/39Ar Datings |
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| YANG Chengdong,YANG Fuquan and WU Yufeng.Timing of Magmatic Activity-Shearing Deformation from the Sarsuk Polymetallic Gold Deposit on the Southern Margin of Altay, Xinjiang:Constraints from Zircon U Pb and Sericite 40Ar/39Ar Datings[J].Geological Review,2016,62(3):631-648. |
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| Authors: | YANG Chengdong YANG Fuquan and WU Yufeng |
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| Institution: | Key Laboratory of Metallogeny and Mineral Assessment, Ministry of Land and Resources, Institute of
Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037, China;Key Laboratory of Metallogeny and Mineral Assessment, Ministry of Land and Resources, Institute of
Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037, China;Key Laboratory of Metallogeny and Mineral Assessment, Ministry of Land and Resources, Institute of
Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037, China |
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| Abstract: | The Sarsuk polymetallic gold deposit is located at the Ashele Basin on the southern margin of Chinese Altay. The orebodies of the deposit are hosted by rhyolite porphyry which is a subvolcanic intrusion within a volcanic conduit. A major breakthrough of exploration was made in recent years, but received little research yet. The timing of mineralization was limited to the latest Middle Devonian (382 Ma). But the ages of barren rhyolite porphyry and subsequent ductile deformation remain elusive, which restricts the progress of peripheral prospecting work. Based on detailed field work and microscopic investigation, we carried out geochronological studies of one rhyolite porphyry sample in the periphery and one mylonite sample in deformation |
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| Keywords: | U-Pb zircon dating 40Ar/39Ar dating of sericite Ashele Basin Sarsuk |
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