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| 黑龙江省乌拉嘎金矿赋矿花岗闪长斑岩锆石 U-Pb年龄、岩石成因及其地质意义 | |
| 引用本文： | 王永彬,刘建明,孙守恪,李艳,李凤友,胡海涛.黑龙江省乌拉嘎金矿赋矿花岗闪长斑岩锆石 U-Pb年龄、岩石成因及其地质意义[J].岩石学报,2012,28(2):557-570. |
| 作者姓名： | 王永彬 刘建明 孙守恪 李艳 李凤友 胡海涛 |
| 作者单位： | 1. 中国科学院地质与地球物理研究所矿产资源重点实验室,北京,100029 2. 中国石油渤海钻探工程有限公司第二录井分公司,沧州,062552 3. 黑龙江乌拉嘎黄金矿业有限责任公司,伊春,153221 |
| 基金项目： | 本文受全国危机矿山接替资源综合研究项目(20089931)、中国科学院战略性先导科技专项项目(XDA08100500)和国家自然科学基金项目(40972065)联合资助. |
| 摘 要： | 黑龙江省是我国著名金矿产区之一,发育多个浅成低温热液型金矿,它们与中生代陆相火山-次火山岩有密切的关系,但对这些陆相火山-次火山岩的成因缺乏系统研究,制约了本区金矿的成因认识和矿床勘查。本次研究采用先进的LA-ICP-MS锆石定年法、地球化学Sr-Nd-Pb同位素示踪等方法,对与乌拉嘎浅成低温热液金矿存在密切成因联系的次火山岩(花岗闪长斑岩)进行深入研究。LA-ICP-MS锆石定年法获得乌拉嘎矿区葡萄沟岩体及其南部含矿岩枝的成岩年龄分别为108.2±1.2Ma和106±1.1Ma,与区内宁远村组火山岩成岩时间基本相近,推断金矿成矿时代为早白垩世晚期,与东安金矿和高松山金矿为同期。岩石地球化学确定该岩体为高钾钙碱性(σ=1.83~2.18)偏铝质I型花岗岩特征,结合微量元素和Sr-Nd-Pb研究显示其具有活动陆缘弧岩浆岩特点,进一步得出岩浆源区和成矿物质具有来源于新元古代形成的镁铁质下地壳的部分熔融的属性。早白垩世时,中国东部处于伸展应力体制下,尤其黑龙江构造活动强烈,起源于新生下地壳重融的岩浆活动频繁,结合已有的浅成低温热液金矿床资料显示,推断区内具有巨大的成矿潜力。 |
| 关 键 词： | 花岗闪长斑岩 锆石U-Pb 岩石成因 乌拉嘎金矿 黑龙江省 |
| 收稿时间： | 2011/8/10 0:00:00 |
| 修稿时间： | 2011/12/1 0:00:00 |
Zircon U-Pb geochronology, petrogenesis and geological implication of ore-bearing granodiorite porphyry in the Wulaga gold deposit, Heilongjiang Province |
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| WANY YongBin,LIU JianMing,SUN ShouKe,LI Yan,LI FengYou and HU HaiTao.Zircon U-Pb geochronology, petrogenesis and geological implication of ore-bearing granodiorite porphyry in the Wulaga gold deposit, Heilongjiang Province[J].Acta Petrologica Sinica,2012,28(2):557-570. | |
| Authors: | WANY YongBin LIU JianMing SUN ShouKe LI Yan LI FengYou and HU HaiTao |
| Institution: | Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029, China;Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029, China;Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029, China;Second Mud Logging Company of CNPC Bohai Drilling Engineering Company Limited,Cangzhou 062552, China;Wulaga Gold Mining Corporation,Yichun 153221, China;Wulaga Gold Mining Corporation,Yichun 153221, China |
| Abstract: | Heilongjiang is one of China’s most famous gold producing districts.Past production in the area was partially from epithermal gold mineralization,which was associated with the Mesozoic subaerial volcanic to subvolcanic intrusions.However,a little work has been done for the petrogenesis of these igneous rocks.In this paper,LA-ICP-MS zircon U-Pb ages,coupled with whole-rock major,trace elements and Sr-Nd-Pb isotopic data are present to constrain the geochronology and the petrogenesis of ore-bearing granodiorite in the Wulaga gold deposit,also discuss the epithermal gold mineralization potential of Heilongjiang Province.Two U-Pb zircon ages from Putaogou granodiorite intrusion and its southern ore-bearing granodiorite porphyry apophysis that occur in the Wulaga gold district are respectively 108.2±1.2Ma and 106±1.1Ma,which are similar to the age of surrounding volcanic rocks.Thus it is inferred that the gold mineralization hosted within the granodiorite porphyry apophysis was also formed in the Early Cretaceous,which was contemporaneous with the Dong’an gold deposit and Gaosongshan gold deposits.The granodiorite porphyry is the typically I-type,calc-alkaline(σ=1.83～2.18) granitoid with meta-aluminous attributes(A/NCK=0.97～1.16) .Geochemical and Sr-Nd-Pb isotopic features suggest that the granodiorite porphyry was likely derived from partial melting of the Neoproterozoic juvenile mafic low-crust,which is inferred to be the source of partial mineral-forming components by comparing with other gold deposits.Early Cretaceous magmatism favored an extensional regime in NE China,when complex tectonic activities occurred,at the same time as intense low crust-sourced magmatism.This result suggests that there is likely huge mineralization potential for epithermal gold deposits in the Heilongjiang Province,through comparison with regional mining epithermal gold deposits. |
| Keywords: | Granodiorite porphyry Zircon U-Pb Petrogenesis Wulaga gold deposit Heilongjiang Province |
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