全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...
矿床地质  2008 

西藏驱龙铜矿西部斑岩与成矿关系的厘定:对矿床未来勘探方向的重要启示

Keywords: 地质学,西部斑岩,U-Pb,SHRIMP定年,斑岩铜矿,驱龙,冈底斯,西藏,西藏驱龙铜矿,斑岩,成矿关系,厘定,矿床勘探,勘探方向,重要启示,exploration,enlightenment,Tibet,copperdeposit,mineralization,Western,减少浪费,投入,手段,科学分析,过程,工程布置方案,围岩

Full-Text   Cite this paper   Add to My Lib

Abstract:

对正在勘查中的西藏驱龙斑岩铜矿床,任何关于基础矿床地质认识上的改变,都可能会引发勘查方向上的重大变动.驱龙铜矿的勘探工作是围绕矿区内出露的几套斑岩体进行的.然而,野外调查发现,矿区西部斑岩体(指原Ⅱ、Ⅲ及Ⅳ号斑岩)却表现出与东部斑岩体(原Ⅰ号斑岩)截然不同的蚀变、矿化及岩石学特征:西部斑岩蚀变以石英-绢云母化为主,局部可见青磐岩化;矿化主要为黄铁矿化,黄铜矿很少;通常产于斑岩铜矿外围的黄铁矿D脉发育.这些特征均表明,西部斑岩整体处于斑岩矿化系统的绢英岩化带,局部甚至处于青磐岩化蚀变带内,并非像东部斑岩(出现以斑岩体为中心、呈同心环状分带的蚀变及矿化系统)一样.西部斑岩还发生了明显的韧性变形,经历了比东部斑岩更为复杂的地质演化过程,其形成时间明显早于东部斑岩.因此,推断西部斑岩对成矿的贡献不大.为证实野外观察的正确性,作者对西部斑岩开展了详细的岩石学、岩石地球化学及年代学研究,结果显示,西部斑岩为高钾钙碱性系列,具有明显的Eu负异常,富集大离子亲石元素,亏损高场强元素,但不亏损Ta,其锆石U-PbSHRIMP年龄为(182.3±1.5)Ma,为早侏罗世的产物,明显不同于形成于中新世的东部斑岩.因此,驱龙铜矿床未来的勘探工程布置方案更加清晰,应紧紧围绕东部斑岩所形成的矿化系统进行.由于西部斑岩出露面积较大,与叶巴组火山岩一样,仅为围岩,并没有形成自己的蚀变与矿化系统,建议不要对该斑岩布置太多的勘查工程.在矿床勘探过程中,详细的野外观察,辅以适当的科学分析手段,往往能够避免投入过多无谓的勘查工程,减少浪费.

References

[1]  Burnham C W.1979.Magmas and hydrothermal fluids[A].In:Barnes H L,ed.Geochemistry of hydrothermal ore deposits[M].2nd ed.New York:Wiley.71~136.
[2]  Composton W,Williams I S and Mayer C.1984.U-Pb geochronology of zircons from lunar breccia 73217 using a sensitive high mass resolution ion microprobg[J].J.Geophys.Res.,89:525~534.
[3]  Dong Y H,Xu J F,Zeng Q G,Mao G Z and Li J.2006.Is there a Neo-Tethys\' subduction record earlier than arc volcanic rocks in the Sangri group[J]? Acts Petrologica Sinica,22:661~668 (in Chinese with English abstract).
[4]  Geng Q R,Pan G T,Jin Z M,Wang L Q,Zhu D C and Liao Z L.2005.Geochemistry and Genesis of the Yeba Volcanic Rocks in the Gangdise Magmatic Arc,Tibet[J].Earth Science,30:747~760(in Chinese with English abstract).
[5]  Geng Q R,Pan G T,Wang L Q,Zhu D C and Liao Z L.2006.Isotopic geochronology of the volcanic rocks from the Yeba Formation in the Gangdise zone,Xizang[J].Sedimentary Geology and Tethyan Geology,26:1~7(in Chinese with English abstract).
[6]  Gustafson L B,and Hunt J P.1975.The porphyry copper deposits at El Salvador,Chile[J].Econ.Geol.,70:857~912.
[7]  Hou Z Q,Zhong D L and Deng W M.2004a.A tectonic model for porphyry copper-molybdenum-gold metallogenie belts on the eastern margin of the Qinghai-Tibet Plateau[J].Geology in China,31:1~16(in Chinese with English abstract).
[8]  Hou Z Q,Gao Y F,Qu X M,Rui Z Y and Mo X X.2004h.Origin of adakitic intrusives generated during mid-Miocene east-west extension insouthem Tibet[J].Earth and Planetary Science Letters,220:139~155.
[9]  Hou Z Q,Meng X J,Qu X M and Gao Y F.2005.Copper ore potential of adakitie intrusives in G-angdese porphyry copper belt:Constrains from rock phase and deep process[J].Mineral Deposits,24:108~121 (in Chinese with English abstract).
[10]  Liu Z S and Wang J M.1994.Geology and geochemistry of granites on southern Qinghai-Xizang (Tibet) plateau[M].Chengdu:Sichuan Science and Technology Press.65~71.
[11]  Miller C,Schuster R,Klotzli U,Frank W and Purtscher F.1999.Post-collisional potassic and uhrapotassic magmatism in SW Tibet:Geochemical and Sr-Nd-Pb-O isotopic constraints for mantle source characteristics and petrogenesis[J].Jour.Petrol.,40:1399~1424.
[12]  Song B,Zhang Y H,Wan Y S and Jian P.2002.Shrimp sampling,dating and issue on its relation[J].Geological Review,48 (Supp.):26~30(in Chinese with English abstract).
[13]  Sun S S and Mcdonough W F.1989.Chemical and isotopic systematics of oceanic bssalts:implications for mantle composition and process[J].Geological Society of London Special Publication,42:313~345.
[14]  Wang J H,Yin A,Harrison T M,et al.2001.A tectonic model for Cenozoic igneous activities in the eastern lndo-Asian collison zone[J].Earth Planet.Sci.Lett.,199:123~133.
[15]  Williams I S.1992.Some observations on the use of zircon U-Pb geochronology in the study of granite rocks[J].Trans.R.Soc.Edinburgh-Earth Sci.,83:447~458.
[16]  Williams I S.1998.U-Th-Pb geochronology by ion microprobe[A].In:Mckibben M A,Shanks W C and Ridley W L,eds.Applications of microanalytical techniques to understanding mineralizing proesses[J].Review in Economic Geology,7:1~35.
[17]  Yang Z M,Hou Z Q,Xia D X,Li Z Q,Song Y Cand Pan F C.2008a.Qulong giant porphyry copper deposit:Geology and alteration[J].Mineral Deposits,27(2) (in press).
[18]  Yang Z M,Hou ZQ,Li Z Q,Song Y Cand Xie Y L.2008b.Direct record of the primary fluid exsolving from magma:Evidence from the Unidirectional Solidification Texture (UST) finding at Qulong porphyry copper deposit in GPCB[J].Chinese Science Bulletin (in review).
[19]  Yang Z M,Hou Z Q,Yang Z S,Wang S X,Wang G R,Tian S H,Wen D Y,Wang Z L and Liu Y C.2008c.Genesis of porphyries and tectonic controls on the Narigongma porphyry Mo (-Cu) deposit,southern Qinghai[J].Acta Petrolngica Sinica (in press).
[20]  Zheng Y Y,Xue Y X,Cheng L J,Fang Z H and Gao S B.2004.Finding,characteristics and significances of Qulong superlarge porphyry copper (molybdenum) deposit,Tibet[J].Earth Science,29(1):103~108(in Chinese with English abstract).
[21]  更多...
[22]  董彦辉,许继峰,曾庆高,王强,毛国政,李杰.2006.存在比桑日群弧火山岩更早的新特提斯洋俯冲记录吗[J]?岩石学报,22:661~668.
[23]  耿全如,潘桂棠,金振民,王立全,朱弟成,廖忠礼.2005.西藏冈底斯带叶巴组火山岩地球化学及成因[J].地球科学,30:747~760.
[24]  耿全如,潘桂棠.王立全,朱弟成,廖忠礼.2006.西藏冈底斯带叶巴组火山岩同位素地质年代[J].沉积与特提斯地质,26:1~7.
[25]  侯增谦,孟祥金,曲晓明,高永丰.2005.西藏冈底斯斑岩铜矿带埃达克质斑岩含矿型:源岩相变及深部过程约束[J].矿床地质,24:108~121.
[26]  侯增谦,钟大赉,邓万明.2004a.青藏高原东缘斑岩铜钼金成矿带的构造模式[J].中国地质,31:1~16.
[27]  刘振声,王洁明.1994.青藏高原南部花岗岩地质地球化学特征[M].成都:四川科技出版社.65~71.
[28]  宋彪,张玉海,万渝生.简平.2002.锆石Shrimp样品制靶、年龄测定及有关现象讨论[J].地质论评,48(增刊):26~30.
[29]  杨志明,侯增谦,夏代详,李振清,宋玉财,潘凤雏.2008a.西藏驱龙超大型斑岩铜矿床:地质与蚀变[J].矿床地质,27(2)(出版中).
[30]  杨志明,侯增谦,李振清,宋玉财,谢玉玲.2008b.西藏驱龙斑岩铜钼矿床中UST石英的发现:初始岩浆流体的直接记录[J].科学通报(审稿中).
[31]  杨志明,侯增谦,杨竹森,王淑贤,王贵仁,田世洪,温德银,王召林,刘英超.2008c.青海纳日贡玛斑岩钼(铜)矿床:岩石成因及构造控制[J].岩石学报(出版中).
[32]  郑有业,薛迎喜,程力军,樊子珲,高顺宝.2004.西藏驱龙超大型斑岩铜(钼)矿床:发现、特征及意义[J].地球科学,29:103-108.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133