陕南铜厂铜矿床成矿物质来源探讨
Source of Ore-Forming Materials of Tongchang Copper Ore Deposit in Southern Shaanxi Province,China
查看参考文献40篇
|
文摘
|
陕南铜厂铜矿床是"勉—略—宁"矿集区内最具代表性的铜矿床,通过黄铜矿等单矿物及矿区地质体的微量与稀土元素地球化学对比研究发现:1)黄铜矿以富Ni、Zn和贫Co为特征,与晚元古代郭家沟组细碧岩类似,较闪长岩和钠长岩不同;矿床中存在轻稀土富集和稀土配分模式相对平坦两类黄铜矿,岩体内外接触带黄铁矿Co/Ni值差异表明其成矿物质具多源性;由矿区各地质体成矿元素背景可见,矿床成矿物质来源应以细碧岩为主、闪长岩为辅。2)黄铜矿Eu负异常明显,其δEu值明显低于闪长岩和细碧岩,这与成矿过程中富挥发分流体所形成云英岩化、钠长石化造成的Eu亏损有关,且黄铜矿Y/Ho值与钠长岩较为相似,暗示铜矿化与钠质交代作用关系密切。3)黄铜矿Co、Ni含量一般大于黄铁矿几倍到几十倍,与矽卡岩、斑岩、火山-次火山热液及火山-喷气型铜矿中黄铜矿差异明显,而与铜镍硫化物型矿床中黄铜矿类似,这可能与成矿作用继承了富Ni源区有关。该矿床成矿模式为:海西期,伴随着勉略洋盆闭合俯冲-碰撞形成勉略宁地区韧-脆性逆冲推覆构造、走滑断层,在区域变质流体与天水混合形成富碱和CO2的混合热液作用下,使地层——细碧岩和部分闪长岩中Cu等成矿物质大量析出,形成低温、低盐度成矿热液,沿矿区发育EW向与NE向两组韧性走滑断裂充填沉淀成矿。 |
|
其他语种文摘
|
The Tongchang deposit is the most typical copper deposit in Mianxian-Lueyang-Ningqiang(Mian-Lue-Ning) area in southern Shaanxi,China.By studying on trace elements and REEs geochemistry of chalcopyrite(pyrite) as well as geological bodies in the deposit,we can draw some conclusions as followings.Firstly,the chalcopyrite is characterized by enrichment of Ni and Zn,depletion of Co,which is similar to the spilite of Late Proterozoic Guojiagou Formaion,while different from diorite and albite rocks in the mine.There are two kinds of chalcopyrites with different REE patterns,one is enriched in LREE and the other has relatively flat REE pattern.The pyrite grains hosted in internal and external contact zones of the diorite intrusion have different Co/Ni ratios,suggesting multiple sources of ore-forming materials.Analyzing on the background values of those ore-forming elements in various geological bodies indicates that ore-forming material is mainly from the spilite and minor from the diorite.Secondly,the chalcopyrite is characterized by obvious negative Eu anomalies and its δEu value is much lower than those of the diorite and spilite.The depletion of Eu is likely related to greisenization and albitization caused by volatile fluids during mineralization.Furthermore,Y/Ho ratios of the chalcopyrite are similar to those of albite rocks,implying the close relationship between copper mineralization and Na replacement.Thirdly,due to the inheritance of the trace elements feature from source of ore-forming mineralizing materials,the Ni and Co content in the chalcopyrite is n-n×10 times than in the pyrite,corresponding to that in Cu-Ni sulfide type deposit and different from that in skarn-type,porphyry-type,volcanic-subvolcanic hydrothermal type as well as VMS Cu deposit.The metallogenic model of Tongchang copper deposit can be listed as following.During the Hercynian period,with the closure,subduction and collision of Mian-Lue ancient oceanic basin,the dutile-brittle thrusting nappe structure and strike-slip fault were formed in Mian-Lue-Ning area.The metasomatism of mixed hydrothermal by regional metamorphic fluid and rainwater,which rich in Na+,K+ and CO2,resulted in the translation of ore-forming materials(e.g.Cu and Ni) from strata of Guojiagou Group and spilite(and diorite) to form the metallogenic hydrothermal fluid.The hydrothermal fluid was characterized by low temperature and salinity,and enriched in ore-forming materials.The Tongchang deposit was resulted from filling and metasomatism of the hydrothermal fluid in the EW-and NE-trending dutile strike-slip faults in this area. |
|
来源
|
吉林大学学报. 地球科学版
,2012,42(1):92-103 【核心库】
|
|
关键词
|
勉略宁地区
;
铜厂
;
铜矿床
;
微量元素
;
成矿物质来源
;
矿床成因
|
|
地址
|
中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵阳, 550002
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
1671-5888 |
|
学科
|
地质学 |
|
基金
|
国家自然科学基金项目
;
国家973计划
|
|
文献收藏号
|
CSCD:4455271
|
参考文献 共
40
共2页
|
|
1.
赵震宇. 陕南地区金矿床综合信息预测.
吉林大学学报：地球科学版,2004,34(2):287-291
|
CSCD被引
12
次
|
|
|
|
|
2.
任文清. 勉略宁三角地区构造演化与金属矿产成矿特征.
西北地质科学,1999,20(2):60-67
|
CSCD被引
6
次
|
|
|
|
|
3.
杨志华. 秦岭[CD1]巴山地区成矿背景和成矿作用的新进展.
陕西地质,2001,19(1):1-23
|
CSCD被引
2
次
|
|
|
|
|
4.
任小华. 陕西勉县[CD1]略阳[CD1]阳平关及周边地区矿产资源调查新进展.
中国地质,2001,28(11):38-39
|
CSCD被引
3
次
|
|
|
|
|
5.
姚书振. 秦岭造山带金属成矿系统.
地球科学：中国地质大学学报,2002,27(5):599-604
|
CSCD被引
58
次
|
|
|
|
|
6.
韩润生.
陕西铜厂矿田构造成矿动力学,2003
|
CSCD被引
6
次
|
|
|
|
|
7.
李军. 陕南铜厂矿区古火山机构和铁铜矿床成矿特征.
西北金属矿产地质,1990(1):24-29
|
CSCD被引
4
次
|
|
|
|
|
8.
王东生. 陕西省略阳县铜厂铜矿床地质特征及成矿分析.
西北金属矿产地质,1992,25(2):8-20
|
CSCD被引
5
次
|
|
|
|
|
9.
吴俞斌. 陕西铜厂矿田古火山机构与成矿关系研究.
矿床地质,1994,13(增刊):54-56
|
CSCD被引
3
次
|
|
|
|
|
10.
方维萱. 秦岭造山带大型-超大型金属矿床形成大陆动力学条件分析.
西北地质,1998,19(3):11-17
|
CSCD被引
4
次
|
|
|
|
|
11.
赵统. 陕西铜厂铁矿床同位素组成特征及其与矿床成因的关系.
西北地质,1981(4):1-11
|
CSCD被引
4
次
|
|
|
|
|
12.
秦克令. 碧口地体同位素地质年代学及其意义.
西北地质科学,1992,13(2):97-108
|
CSCD被引
23
次
|
|
|
|
|
13.
丁振举. 陕西略阳铜厂铜矿床成矿时代及地质意义.
西安工程学院学报,1998,20(3):24-27
|
CSCD被引
18
次
|
|
|
|
|
14.
叶霖. 陕南勉宁略地区铜厂铜矿包裹体地球化学特征研究.
矿物学报,1997,17(2):194-199
|
CSCD被引
9
次
|
|
|
|
|
15.
周圣华. 陕西铜厂铜金多金属矿床地质特征及成矿流体地球化学.
中国地质,2008,35(2):298-304
|
CSCD被引
7
次
|
|
|
|
|
16.
叶霖. 陕南勉略宁地区铜厂矿区的钠长岩.
矿物岩石,1997,17(4):9-14
|
CSCD被引
1
次
|
|
|
|
|
17.
叶霖. 陕南勉略宁地区铜厂闪长岩岩石地球化学及SHRIMP锆石U-Pb同位素年代学.
岩石学报,2009,25(11):2866-2876
|
CSCD被引
24
次
|
|
|
|
|
18.
蒋林奎. 陕西略阳铜厂铜矿成矿远景初步预测.
西北金属矿产地质,1988(2):21-25
|
CSCD被引
1
次
|
|
|
|
|
19.
蒋林奎. 陕南勉略宁地区铜矿床类型及找矿方向.
西北金属矿产地质,1991(2):8-13
|
CSCD被引
1
次
|
|
|
|
|
20.
雷祖志. 陕西勉略宁地区中部火山岩带铜银金矿床统计预测及成矿远景研究.
西北金属矿产地质,1991(2):35-43
|
CSCD被引
1
次
|
|
|
|
|
了解气象卫星更多信息，请访问