云南马厂箐铜钼矿床碱性杂岩体期次划分及LA-ICP-MS锆石U-Pb定年
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摘要
云南省马厂箐铜矿床位于"三江"成矿带中南段,是大陆碰撞环境下与喜马拉雅期碱性斑岩有关的矿床,矿区大面积出露的碱性杂岩体是一复式岩体,与成矿作用关系密切。文章通过大量野外调查和室内工作,对其侵入时间、侵入期次和各期次岩性组合特征进行了研究,认为马厂箐岩体共经历了3期演化:Ⅰ期正长斑岩、石英正长斑岩→Ⅱ期斑状花岗岩、早期煌斑岩→Ⅲ期花岗斑岩、晚期熄斑岩。其中Ⅰ期不成矿,Ⅱ期与Ⅲ期岩浆活动与成矿关系密切。通过LA-ICP-MS锆石U-Pb同位素年龄测试,确定其形成时代在32.4~38.5 Ma之间,其活动时间与印度—亚洲碰撞带岩浆活动主要成矿时间和青藏高原晚碰撞阶段成矿高峰期时间一致。
The Machangqing Cu-Mo deposit located in the central-southern part of Sanjiang metallogenic belt in Yunnan Province,is an alkaline porphyry type deposit of Himalayan period in the continental collision environment.The alkalic complex which outcrops widely in Machangqing deposit area is a duplex pluton,and is closely related to the copper-molybdenum mineralization.Based on the large amount of field investigation data and indoor research information,the intrusion age and stages of intrusion of the alkaline complex,and the lithological association of each period alkaline rockmass were studied,and the evolution of the Machangqing alkalic complex was classified into three stages,i.e.,the first stage of syenite and quartz syenite porphyry,the second stage of porphyrilic granite and early lamprophyre dike,and the third stage of granite porphyry and late lamprophyre dike.Among them,there is no mineralization associated with the first stage of intrusion,and extensive mineralization with the second and third stages of intrusion.Based on the UPb isotope measurement of the zircon mineral by LA-1CP-MS,it is interpreted that the formation age of Machangqing alkalic complex ranges from 32.4 Ma to 38.5 Ma.The intrusion age is consistent with the period of the magmatic metallogenesis within the India-Asia plate collision zone and the period of the main mineralization in the late Qingzang plate collision.
The Machangqing Cu-Mo deposit located in the central-southern part of Sanjiang metallogenic belt in Yunnan Province,is an alkaline porphyry type deposit of Himalayan period in the continental collision environment.The alkalic complex which outcrops widely in Machangqing deposit area is a duplex pluton,and is closely related to the copper-molybdenum mineralization.Based on the large amount of field investigation data and indoor research information,the intrusion age and stages of intrusion of the alkaline complex,and the lithological association of each period alkaline rockmass were studied,and the evolution of the Machangqing alkalic complex was classified into three stages,i.e.,the first stage of syenite and quartz syenite porphyry,the second stage of porphyrilic granite and early lamprophyre dike,and the third stage of granite porphyry and late lamprophyre dike.Among them,there is no mineralization associated with the first stage of intrusion,and extensive mineralization with the second and third stages of intrusion.Based on the UPb isotope measurement of the zircon mineral by LA-1CP-MS,it is interpreted that the formation age of Machangqing alkalic complex ranges from 32.4 Ma to 38.5 Ma.The intrusion age is consistent with the period of the magmatic metallogenesis within the India-Asia plate collision zone and the period of the main mineralization in the late Qingzang plate collision.
引文
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[3]张玉泉.谢应雯,梁华英.等.藏东玉龙铜矿带含矿斑岩及成岩系列[J].地球化学,1998,27:236-243.
[4]葛良胜,邹依林.李振华,等.云南马厂箐(铜、钼)金矿床地质特征及成因研究[J].地质与勘探,2002,38(5):11-17.
[5]彭建堂.毕献武.胡瑞忠,等.滇西马厂箐斑岩铜(钼)矿床成岩成矿时限的厘定[J].矿物学报,2005,25(1):69-73.
[6]Wiedenbeck M,Alle P,Corfu F,Griffin WL,Meier M,Oberli F,Vonquadt A,Roddick JC and Speigel W.Three natural zircon standards for U-Th-Pb,Lu-Hf,trace-element and REE analyses[J].Geostand.Newsl.1995,19:1-23.
[7]Chipley D,Polito P A and Kyser T K.Measurement of U-Pb ages of uraninite and davidite by laser ablation-HR-ICP-MS[J].American Mineralogist,2007,92(11-12):1925-1935.
[8]Ludwig K R.ISOPLOT3.00;A geochronological toolkit for microsoft excel[M].Berkeley;Berkeley Geochronology Center,California,2003.
[9]Belousova E A,Griffin W L,O'Reilly S Y,et al.Igneous Zircon;Trace Element Composition as an Indicator of Source RockType[J].Contrib.Mineral.Petrol.,2002,143:602-622.
[10]张国伟.董云鹏,赖绍聪,等.秦岭-大别造山带南缘勉略构造带与勉略缝合带[J].中国科学:D辑,2003,33(12):1121-1135.
[1I]曾将胜,侯增谦.高永峰.等.印度-亚洲碰撞带东段喜马拉雅期铜-钼-金矿床Re-Os年龄及成矿作用[J].地质论评.2006.52(1):72-84.
12]侯增谦,曲晓明,王淑贤,等.西藏高原冈底斯斑岩铜矿带辉钼矿Re-Os年龄:成矿作用时限与动力学背景应用[J].中国科学,2003,33(7):609-618.
[13]侯增谦.斑岩Cu-No-Au矿床:新认识与新进展[J].地学前缘,2004,11(1):131-144.
[14]郭晓东.云南省马厂箐斑岩型铜锢金矿床岩浆作用及矿床成因[D].北京:中国地质大学,2009.
[15]金志升,黄智龙,朱成明.云南三江地区富碱侵入岩与煌斑岩的同源性[J].矿物岩石地球化学通报,1997,16(4):222-224.
[16]梁华英,谢应雯,张玉泉.富钾碱性岩体形成演化对铜矿成矿制约——以马厂箐铜矿为例[J].自然科学进展.2004,14(1):116-120.
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