| 滇西龙陵地区三叠纪蚌东花岗岩体LA-ICP-MS锆石U-Pb年龄、地球化学特征及其构造意义 |
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| 引用本文： | 王晓林,李维科,黄亮,宋冬虎,晏海宝,卢晓萍.滇西龙陵地区三叠纪蚌东花岗岩体LA-ICP-MS锆石U-Pb年龄、地球化学特征及其构造意义[J].地质通报,2018,37(11):2071-2078. |
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| 作者姓名： | 王晓林 李维科 黄亮 宋冬虎 晏海宝 卢晓萍 |
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| 作者单位： | 云南省地质调查院, 云南 昆明 650216,云南省地质调查院, 云南 昆明 650216,云南省地质调查院, 云南 昆明 650216,云南省地质调查院, 云南 昆明 650216,云南省地质调查院, 云南 昆明 650216,云南省地质调查院, 云南 昆明 650216 |
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| 基金项目： | 中国地质调查局项目《云南省镇康县芦子园勘查区乌木寨、玉明珠等6幅区域地质矿产调查项目》（编号：12120113048900）、《云南1∶5万归州、宝丰、漕涧、功果街幅区域地质调查》（编号：1212010000150007-26）、《云南区域地质调查片区总结与服务产品开发》（编号：DD20160345-02）和云南省科技领军人才培养计划项目《西南“三江”叠合成矿作用与成矿预测》（编号：2013HA001） |
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| 摘 要： | 保山地块是滇西特提斯多岛洋的重要组成部分,属滇-缅-马-泰微大陆的北端。出露于保山地块西部的蚌东花岗岩体的LA-ICP-MS锆石U-Pb年龄为228.3±1.7Ma,记录了特提斯洋关闭后的弧-陆碰撞过程。该岩体以正长花岗岩为主,岩石具有高硅、富碱、低镁、低钙、富铬、富镍的特点;在B-A图解上显示了堇青石过铝花岗岩的演化特征;总体上表现为富集大离子亲石元素、亏损高强场元素的特点,可划归后碰撞-后造山花岗岩。但是,该岩体远离昌宁-孟连主特提斯弧-陆碰撞带,可能是主造山过程晚期,滇-缅-马-泰微大陆内部各微小陆块相互作用导致地幔岩石圈发生拆沉作用的产物,或是昌宁-孟连洋盆闭合过程中俯冲板块的拖拽在后缘的岩石圈伸展作用的产物。
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| 关 键 词： | 滇西地区 保山地块 蚌东花岗岩体 三叠纪 LA-ICP-MS锆石U-Pb年龄 特提斯 构造意义 |
| 收稿时间： | 2018/3/20 0:00:00 |
| 修稿时间： | 2018/5/2 0:00:00 |
LA-ICP-MS zircon U-Pb age, geochemical characteristics and tectonic implications of the Bangdong granite intrusions in Longling area, western Yunnan Province |
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| WANG Xiaolin,LI Weike,HUANG Liang,SONG Donghu,YAN Haibao and LU Xiaoping.LA-ICP-MS zircon U-Pb age, geochemical characteristics and tectonic implications of the Bangdong granite intrusions in Longling area, western Yunnan Province[J].Geologcal Bulletin OF China,2018,37(11):2071-2078. |
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| Authors: | WANG Xiaolin LI Weike HUANG Liang SONG Donghu YAN Haibao and LU Xiaoping |
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| Institution: | Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China,Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China,Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China,Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China,Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China and Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China |
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| Abstract: | Located at the northern end of the Yunnan-Myanmar-Malaysia-Thailand microcontinent, the Baoshan block is an important part of multi-island ocean in Paleozoic Tethys of western Yunnan. Bangdong granite intrusion, which is located in western Baoshan block and has LA-ICP-MS zircon U-Pb weighted average age of 228.3±1.7Ma, recorded the process of arc-land collision after the closure of Tethys. The intrusion consists of main orthogranite, with rich silicon and alkali, poor magnesium and calcium as well as rich chromium and nickel, showing evolution tendency of cordierite per-aluminous granite in B-A diagram. On the whole it is enriched in LILE (large ionic lithophile elements) and depleted in HFSE (high field strong elements), thus can be classified as postcollision or post-orogenic granite. Nevertheless, Bangdong granite intrusions, which stay away from Changning-Menglian Tethys main arc-land collision belts, resulted from the mantle lithosphere delamination by micro-block interaction in Yunnan-MyanmarMalaysia-Thailand microcontinent. And it probably resulted from the lithosphere extension at the trailing edge by subduction plate dragging during the closure of Changning-Menglian Tethys. |
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| Keywords: | western Yunnan Province Baoshan block Bangdong granite intrusions Triassic LA-ICP-MS zircon U-Pb age Tethys tectonic implication |
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