| 黑龙江小多宝山矽卡岩型Fe-Cu矿床成矿时代及构造背景——来自岩石地球化学、锆石年代学及Hf同位素证据 |
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| 引用本文： | 杨贺,马万里,蔡文艳,王可勇,孙丰月,王建华,周红英,寇柏燕.黑龙江小多宝山矽卡岩型Fe-Cu矿床成矿时代及构造背景——来自岩石地球化学、锆石年代学及Hf同位素证据[J].岩石学报,2020,36(3):856-870. |
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| 作者姓名： | 杨贺 马万里 蔡文艳 王可勇 孙丰月 王建华 周红英 寇柏燕 |
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| 作者单位： | 吉林大学地球科学学院, 长春 130061,吉林大学地球科学学院, 长春 130061,吉林大学地球科学学院, 长春 130061,吉林大学地球科学学院, 长春 130061;自然资源部东北亚矿产资源评价重点实验室, 长春 130061,吉林大学地球科学学院, 长春 130061,黑龙江多宝山铜业有限公司, 嫩江 161416,中国地质调查局天津地质调查中心, 天津 300170,内蒙古自治区第六地质矿产勘查开发院, 海拉尔 021008 |
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| 基金项目： | 本文受国家重点研发计划项目（2017YFC0601304）和自然资源部重点实验室自主基金课题（DBY-ZZ-18-12）联合资助. |
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| 摘 要： | 黑龙江小多宝山Fe-Cu矿床是多宝山-三矿沟多金属成矿带内一典型的矽卡岩型矿床。根据矿物共生组合及矿脉穿切关系,将其成矿作用划分为两期:矽卡岩期和石英-硫化物期;进一步划分为五个阶段:石榴子石-辉石干矽卡岩阶段;绿帘石-阳起石等含水硅酸盐湿矽卡岩阶段;磁铁矿-镜铁矿-石英氧化物阶段;黄铁矿-黄铜矿-石英早期硫化物阶段以及方铅矿-闪锌矿-方解石晚期硫化物阶段。本文报道了该矿床成矿岩体花岗闪长岩的锆石U-Pb年龄、全岩地球化学及锆石Hf同位素数据。花岗闪长岩锆石加权年龄为176±1Ma(MSWD=0.10,n=23),反映小多宝山矿床成矿时代为早侏罗世。其岩石地球化学特征表现为:富钠(Na2O/K2O=1.45%~1.63%),准铝质(A/CNK=0.92~0.97),富集轻稀土元素(LREE)、大离子亲石元素(如Rb、Ba、Sr、K等),相对亏损高场强元素(如Ta、Nb、Ti等),(La/Yb)N=11.16~12.87,表现出弱的负Eu异常(δEu=0.85~0.92),显示出岛弧岩浆岩的地球化学亲缘性。综合岩石地球化学及同位素测试结果,小多宝山花岗闪长岩为准铝质高钾-钙碱性I型花岗岩,起源于幔源岩浆结晶分异作用。锆石Hf同位素εHf(t)为+7.6^+11.4,二阶段模式年龄(tDM2)为492~732Ma,指示其岩浆源区为古生代新生地壳的熔融。结合区域构造演化,推断小多宝山花岗闪长岩形成于古太平洋板块俯冲的构造环境。
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| 关 键 词： | 小多宝山Fe-Cu矿床 矽卡岩型 成矿时代 构造背景 |
| 收稿时间： | 2019/6/29 0:00:00 |
| 修稿时间： | 2019/12/3 0:00:00 |
Metallogenic epoch and tectonic setting of the Xiaoduobaoshan Fe-Cu deposit in Heilongjiang Province, China: Evidence from petrogeochemistry, zircon U-Pb geochronology and Hf isotopic compositions |
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| YANG He,MA WanLi,CAI WenYan,WANG KeYong,SUN FengYue,WANG JianHu,ZHOU HongYing and KOU BaiYan.Metallogenic epoch and tectonic setting of the Xiaoduobaoshan Fe-Cu deposit in Heilongjiang Province, China: Evidence from petrogeochemistry, zircon U-Pb geochronology and Hf isotopic compositions[J].Acta Petrologica Sinica,2020,36(3):856-870. |
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| Authors: | YANG He MA WanLi CAI WenYan WANG KeYong SUN FengYue WANG JianHu ZHOU HongYing and KOU BaiYan |
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| Institution: | College of Earth Science, Jilin University, Changchun 130061, China,College of Earth Science, Jilin University, Changchun 130061, China,College of Earth Science, Jilin University, Changchun 130061, China,College of Earth Science, Jilin University, Changchun 130061, China;Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources, Changchun 130061, China,College of Earth Science, Jilin University, Changchun 130061, China,Heilongjiang Duobaoshan Copper Co., Ltd., Nenjiang 161416, China,Tianjin Geological Survey Center, China Geological Survey, Tianjin 300170, China and The Inner Mongolia Autonomous Region Sixth Geology and Mineral Exploration and Development Institute, Hailaer 021008, China |
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| Abstract: | The Xiaoduobaoshan Fe-Cu deposit is a typical skarn deposit which is located in the Duobaoshan-Sankuanggou metallogenic belt in Heilongjiang,China.Based on the mineral symbiotic assemblage and cutting relationships of ore veins,the mineralization process can be divided into two phases:skarn phase and quartz-sulfide phase.The two phases can be further divided into five stages:garnet-diopside(dry skarn stage);epidote-actinolite(wet skarn stage);magnetite-specularite-quartz(oxide stage);pyrite-chalcopyrite-quartz(early sulfide stage)and galena-sphalerite-calcite(late sulfide stage).The geochemistry,U-Pb chronology and Hf isotopic data of granodiorite in the Xiaoduobaoshan area were studied.The results of zircon U-Pb geochronology for the granodiorite show that the weighted mean age of the rock is 176±1Ma(MSWD=0.10,n=23),suggesting that the Xiaoduobaoshan deposit was formed in the Early Jurassic.Petrogeochemically,the granodiorite are characterized by high content of Na2O/K2O(1.45%~1.63%),the aluminum saturation index(A/CNK)is 0.92~0.97,belonging to metaluminous calc-alkaline rock series.The samples are enriched in LREE and large ion elements(e.g.,Rb,Ba,Sr and K),depleted in high field strength elements(e.g.,Ta,Nb and Ti).The index of(La/Yb)N is 11.16~12.87,with unobvious negative Eu anomalies(δEu=0.85~0.92),suggesting the island arc magmatic rocks geochemical relatedness.Integrating the study of geochemistry and isotopes,the granodiorite of Xiaoduobaoshan area belong to metaluminous high potassium calc-alkaline I-type granite,which originated from the crystallization differentiation of mantle magma.TheεHf(t)values of the granodiorite range from+7.6 to+11.4,and two-stage Hf model ages(tDM2)range from 492~732Ma,indicating that the magma source region is a partial melting of the new curst.Combined with regional tectonic environment,we concluded that the granodiorite of Xiaoduobaoshan area was formed in the tectonic environment of subduction of paleo-Pacific Plate. |
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| Keywords: | Xiaoduobaoshan Fe-Cu deposit Skarn Geochronology Tectonic setting |
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