|
|||||
|
|
| 云南马厂箐岩体中深源包体特征及其锆石LA-ICP-MSU-Pb年龄 | |
| 引用本文： | 郭晓东,葛良胜,王梁,王治华,史小翠.云南马厂箐岩体中深源包体特征及其锆石LA-ICP-MSU-Pb年龄[J].岩石学报,2012,28(5):1413-1424. |
| 作者姓名： | 郭晓东 葛良胜 王梁 王治华 史小翠 |
| 作者单位： | 1. 中国地质科学院地质研究所,北京100037;武警黄金地质研究所,廊坊065000 2. 武警黄金地质研究所,廊坊065000;中国地质大学地球科学与资源学院,北京100083 3. 武警黄金地质研究所,廊坊,065000 |
| 基金项目： | 本文受973国家重点基础研究发展计划(2009CB421008)和武警黄金指挥部专项基金(WHY11-08)联合资助. |
| 摘 要： | 马厂箐岩体属于滇西富碱侵入岩的重要组成部分,在马厂箐岩体中发现了镁铁质暗色深源包体,这对于研究滇西富碱侵入岩带的起源、演化、成岩成矿作用以及区域地球动力学机制具有重要意义。本文基于对深源包体地质特征研究,通过开展LA-ICPMSU-Pb锆石定年,得到花岗斑岩中镁铁质深源包体锆石U-Pb加权平均年龄为35.13±0.23Ma(MSWD=0.64),与其寄主岩花岗斑岩年龄(35.0±0.2Ma)和(似)斑状花岗岩年龄(33.78±0.21Ma)较为一致,结合深源包体及其寄主岩锆石的Th/U比值及Ti温度计特征,证明了包体的岩浆混合成因。分析认为:马厂箐富碱侵入岩体为壳源岩浆与幔源岩浆混合作用的产物;包体与其寄主岩具有相同或相似的岩浆演化过程;35Ma左右存在幔源岩浆的底侵注入,幔源岩浆的注入混合可能是这套岩浆成矿的关键。 |
| 关 键 词： | 深源包体 锆石U-Pb年龄 壳-幔岩浆混合 马厂箐岩体 云南 |
| 收稿时间： | 5/1/2011 12:00:00 AM |
| 修稿时间： | 7/6/2011 12:00:00 AM |
Characteristics of deep-derived enclave and its zircon LA-ICP-MS U-Pb age of Machangqing complex, Yunnan Province |
|
| GUO XiaoDong,GE LiangSheng,WANG Liang,WANG ZhiHua and SHI XiaoCui.Characteristics of deep-derived enclave and its zircon LA-ICP-MS U-Pb age of Machangqing complex, Yunnan Province[J].Acta Petrologica Sinica,2012,28(5):1413-1424. | |
| Authors: | GUO XiaoDong GE LiangSheng WANG Liang WANG ZhiHua and SHI XiaoCui |
| Institution: | Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Gold Geology Institute of CAPF, Langfang 06500, China;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Gold Geology Institute of CAPF, Langfang 06500, China;Gold Geology Institute of CAPF, Langfang 06500, China;School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China;Gold Geology Institute of CAPF, Langfang 06500, China;Gold Geology Institute of CAPF, Langfang 06500, China |
| Abstract: | Machangqing complex is an important part of alkali-rich porphyry belt in western Yunnan. The deep-derived mafic enclaves that found in Machangqing complex are significant for studying the origin and evolution of alkali-rich porphyry, ore-forming process, and regional geodynamics. According to the geological features of the enclaves, the author analyzed the zircons from enclaves with the LA-ICP-MS and obtained a U-Pb weighted average age of 35.13±0.23Ma (MSWD=0.64). This age is consistent with the age of granite porphyry (35.0±0.2Ma) and porphyritic granite (33.78±0.21Ma) which are the host rocks of enclaves. The Th/U value and Ti thermometer tempetature of zircons from enclaves and host rocks suggest that the enclaves are from magma mixing. Studies show the Machangqing alkali-rich porphyry is the mixture of crust-derived and mantle-derived magma enclaves and their host rocks have the similar magma evolution process and the injection of mantle-derived magma is a key factor to the ore-formation of this series magma. |
| Keywords: | Deep-derived enclave Zircon U-Pb Age Mixing of crust and mantle magma Machangqing complex Yunnan Province |
| 本文献已被 CNKI 万方数据 等数据库收录！ | |
| 点击此处可从《岩石学报》浏览原始摘要信息 | |
| 点击此处可从《岩石学报》下载免费的PDF全文 | |