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滇西马厂箐煌斑岩成因:地球化学、年代学及Sr-Nd-Pb-Hf同位素约束
引用本文:贾丽琼,莫宣学,董国臣,徐文艺,王梁,郭晓东,王治华,韦少港.滇西马厂箐煌斑岩成因:地球化学、年代学及Sr-Nd-Pb-Hf同位素约束[J].岩石学报,2013,29(4):1247-1260.
作者姓名:贾丽琼  莫宣学  董国臣  徐文艺  王梁  郭晓东  王治华  韦少港
作者单位:1. 中国地质大学地球科学与资源学院,北京100083;中国地质大学地质过程与矿产资源国家重点实验室,北京100083
2. 中国地质科学院矿产资源研究所,北京,100037
3. 中国地质大学地球科学与资源学院,北京100083;武警黄金地质研究所,廊坊065000
4. 武警黄金地质研究所,廊坊,065000
基金项目:本文受国家重点基础研究发展规划项目(2009CB421002);111计划项目(B07011);长江学者和创新团队发展计划(IRT1083)和中国地质调查局研究项目(1212011220920)联合资助.
摘    要:滇西马厂箐煌斑岩脉分为早晚两期,早期为云斜煌岩,晚期为云煌岩.对煌斑岩样品进行锆石LA-MC-ICP-MS U-Pb定年,获得33.77±0.11Ma的岩浆侵位年龄,表明马厂箐煌斑岩为马厂箐复式杂岩体中期岩浆结晶作用的产物,也是金沙江-哀牢山断裂带新生代早期岩浆活动的产物.岩石地球化学分析表明马厂箐煌斑岩高钾(K2O/NaO=2.88 ~4.60)、富碱(K2O+ Na2O =6.40% ~7.55%)、高Mg# (74.3~76.9),富集大离子亲石元素(LILE) (K、Rb、Ba)和轻稀土元素(LREE),亏损高场强元素(HFSE)(Nb、Zr、P)和重稀土元素.同位素以高(87Sr/86Sr)i(0.707406~0.706506),低εNd(t)(-1.78~-7.64),富集放射性Pb(208 pb/204 Pb=38.87 ~ 39.35,207Pb/204 Pb=15.6390~15.6431,206Pb/204 Pb=18.6579 ~ 18.8093)为特征.176Hf/177Hf为0.282712 ~0.282864,εHf(t)为-1.4~4.0,εNd(t)与εHf(t)存在Nd-Hf同位素解耦.根据岩石地球化学和同位素特征以及区域构造演化历史分析,马厂箐煌斑岩起源于金沙江洋壳俯冲交代作用形成的富集地幔,区域上软流圈物质上涌可能促使EMII的部分熔融形成煌斑岩岩浆,而金沙江-哀牢山断裂及其与其他断裂的交汇处则为岩浆上侵提供了良好的通道.

关 键 词:煌斑岩  地球化学  年代学  Sr-Nd-Pb-Hf同位素  岩石成因  马厂箐
收稿时间:2012/10/18 0:00:00
修稿时间:2013/1/20 0:00:00

Genesis of lamprophyres from Machangqing, western Yunnan: Constraints from geochemistry, geochronology and Sr-Nd-Pb-Hf isotopes
JIA LiQiong,MO XuanXue,DONG GuoChen,XU WenYi,WANG Liang,GUO XiaoDong,WANG ZhiHua and WEI ShaoGang.Genesis of lamprophyres from Machangqing, western Yunnan: Constraints from geochemistry, geochronology and Sr-Nd-Pb-Hf isotopes[J].Acta Petrologica Sinica,2013,29(4):1247-1260.
Authors:JIA LiQiong  MO XuanXue  DONG GuoChen  XU WenYi  WANG Liang  GUO XiaoDong  WANG ZhiHua and WEI ShaoGang
Institution:School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 10008;School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 10008;School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 10008;Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;Gold Geology Institute of Chinese Armed Police Force, Langfang 065000, China;Gold Geology Institute of Chinese Armed Police Force, Langfang 065000, China;School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;Gold Geology Institute of Chinese Armed Police Force, Langfang 065000, China;School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 10008
Abstract:
Keywords:Lamprophyres  Geochemistry  Geochronology  Sr-Nd-Pb-Hf isotopes  Genesis  Machangqing
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