新疆包古图斑岩型铜钼矿床容矿岩石及蚀变特征
Host-rocks and alteration characters of the Baogutu porphyry copper-molybdenum deposit in Xinjiang, NW China
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摘要: 新疆包古图斑岩型铜钼矿床位于西准噶尔晚古生代达拉布特岛弧南部。根据容矿岩石、热液蚀变和矿化特点,结合成矿元素Cu-Mo-(Au)组合特征,认为该矿床是斑岩型铜钼矿床。 研究识别出含矿岩体是一个岩性和岩相复杂的中性斑岩体,岩性主要为闪长岩、似斑状(石英)闪长岩、(石英)闪长玢岩、隐爆角砾岩和各种脉岩,有少量的花岗闪长岩,岩相从岩体中心向外依次为中心相、主体相和边缘相,稍晚形成的深部隐爆相叠加在上述各岩相上。浸染状和细脉浸染状矿化赋存于岩体各岩相尤其是深部隐爆相中,少量赋存于围岩中。热液蚀变填图和研究显示,蚀变从岩体中心向外依次为由钾硅酸盐化和石英绢云母化组成的叠加带、角岩化带和青磐岩化带,与Hollister的模式类似。矿体主要赋存于叠加带中,部分赋存于角岩化带中。包古图斑岩型铜钼矿床中性岩浆-流体活动控制着岩体的蚀变与矿化。Abstract: The Baogutu porphyry copper-molybdenum deposit locates in the Darbut magmatic arc of the western Junggar. Based on the host rocks, alterations in stock and wall-rocks, and disseminated and network mineralization, together with Cu-Mo-(Au) association, the Baogutu deposit is a porphyry copper-molybdenum deposit. Our research recognized that the Baogutu intrusion is an intermediate porphyry with several lithologies and lithofacies. The host rocks are diorite, porphyaceous (quartz) diorite, (quartz)diorite porphyry, minor granodiorite, related breccias and various dikes. We have recoginized the four lithofacies that are central, principal, and border phases from centre outwards and the related breccias phase which occurs in inner stock and wall-rocks and overprints the earlier other three phases. Disseminated and network mineralization mainly occurred inner the stock and minor in the outer wall-rocks. Alterations in stock and wall-rocks have overprinting zonation with blurry boundary. The alteration mapping in the Baogutu district shows that the three zones can be broadly distinguished according to the altered mineral assemblages. The concentric alteration zones from the inner outwards are successively the overprinting zone of the K-silicate zone and the quartz-sericite zone, hornfelsed zone, and the propylitic zone, being similar to the Hollister-type alteration model. Quartz-sericite zone overprints both the K-silicate zone and the hornfelsed zone. The ore bodies mostly occur in the overprinting zones of the K-silicate zone and the quartz-sericite zone, locally occurs in the hornfelsed zone. Our research suggests that the mineralization and alteration occurred in the Baogutu porphyry Cu-Mo deposit is closely related with the intermediate porphyry in which the deposit occurred.
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Key words:
- Porphyry copper-molybdenum deposit /
- Intermediate porphyry /
- Diorite /
- Alteration zoning /
- Baogutu /
- Xinjiang
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[1] 沈远超,哈图金矿带地质、物探、化探综合研究及找矿靶区优选(Ⅱ1),1990.
[2] 张锐,张云孝,许发军,新疆托里县包古图斑岩型铜金矿预查地质报告,2002.
[3] Ballard JR,Palin JM,Campbell IH,Relative oxidation states of magnmsinferred from Ce(Ⅳ)/Ce(Ⅲ)in zircon:Application to porphyry copper deposits of noithern,Chile Contrib Mineral Petrol,2002.
[4] Chen B,Arakawa Y,Elemental and Nd-Sr isotopic geochemistry of granitoids from the West Junggar foldbelt(NW China),with implications for Phanerozoic continental growth,Geochimica et Cosmochimica Acta,2005.
[5] Chen B,Jahn B-m,Genesis of post-collisional granitoids and basement nature of the Janggar Terrane,NW China:Nd-Sr isotope and trace element evidence,Journal of Asian Earth Sciences,2004.
[6] 陈晔.孙明新.张新龙 西准噶尔巴尔鲁克断裂东南侧石英闪长岩锆石SHRIMP U-Pb测年 [J].-地质通报2006(8)
[7] 成勇.张锐 新疆西准包古图地区铜金矿成矿规律浅析 [J].-地质与勘探2006(4)
[8] Guilermo OC,Roberto FC,Gustafson LB,Geology of the Chuquicamata Mine:A progress report,Economic Geology,2001.
[9] 韩宝福.季建清.宋彪.陈立辉.张磊 新疆准噶尔晚古生代陆壳垂向生长(Ⅰ)--后碰撞深成岩浆活动的时限 [J].-岩石学报2006(5)
[10] Hollister VF,Potter RR,Barker AL,Porphyry-type depesits of Appalachian Orogen,Economic Geology,1974.
[11] Hollister VF,Models for prespect evaluation of porphyry copper deposits,New York:Society for Mining,Metallurgy and Exploration,1991.
[12] Hou ZQ,Gao YF,Qu XM,Origin of adakitic intrusives generated during mid-Miocene east-west extension in South Tibet,Earth PIaneL Sci Lett,2004.
[13] Hu AQ,Wang ZG,Tu GC,Gedogical Evolution and Diagenesis and Metallogenesis in Northern Xinjiang,China,北京:科学出版社,1997.
[14] Kirkham RV,Sinclair WD,Porphyry copper,gold,molybdenum,tungsten,tin,silver,Geological Survey of Canada,Geology of Canada,1995.
[15] Le Bas MJ,Le Maitre RW,Streckeisen A,Zanetin B,A chemical classification of volcanic rocks based on the total alkaliessilica diagram,Journal of Petrology,1986.
[16] Li HQ,Xie CF,Chang HL,Study on Metallogenetic Chronology of Nonferrous and Precious Metallic Ore Deposits in North Xinjiang,China,北京:地质出版社,1998.
[17] Lowell JD,Guilber TJM,Lateral and vertieal alteration mineralization zoning in porphyry ore deposits,Economic Geology,1970.
[18] Meng XJ,Hou ZQ,Gao YF,Qu XM and Huang W,The alteration zoning model of porphyry copper deposit in collisional orogen:Case study of porphyry copper deposits in Gangdise Belt,Xizang(Tihet),Earth Sciences Frontiers,2004(1).
[19] Nakamura N,Determination of REE,Ba,Mg,Na and K in carbonaceous and ordinary chondrites,Geochimica et Cosmochimica Acta,1974.
[20] Qin KZ,Sun S,Li JL,Fang TH Wang SL and Liu W,Paleozoic epithermal Au and porphyry Cu Deposits in North Xinjiang,China:Epochs,Features,Tectonic Linkage and Exploration Significance,Resource Geology,2002(4).
[21] Richards JP,Tectono-magmatie precursors for porphyry Cu-(Mo-Au)deposit formation,Economic Geology,2003.
[22] Shen P,Shen YC,Liu TB,Li GM and Zeng QD,Geology and geochemistry of the Early Carboniferous Eastern Sawur caldera complex and associated gold epithermal mineralization,Sawur Mountains,Xinjiang,China,Journal of Asian Earth Sciences,2008.
[23] 申萍.沈远超.刘铁兵.卢洁瑾.魏锦萍.宋国学.孟磊 新疆西北缘晚古生代金铜成矿作用与构造演化 [J].-岩石学报2008(5)
[24] Shen P,Mineralization and tectonic-fluid geochemistry in Sawuer gold belt,Xinjiang,Beijing:Institute of Geology and Geophysics.Chinese Academy of Sciences,2004.
[25] Shen P,Shen YC,Liu TB,Meng L,Dai HW and Yang YH,Geochemical signature of porphyries in the Baogntu porphyry copper belt,western Junggar,NW China,Gondwana Research,2009.
[26] Shen YC,Jin CW,Qi JY,Ore-forming model and mechanism of gold mineralization area in west Junggar,北京:科学出版社,1993.
[27] Shen YC,Jin CW,Magmatism and Gold Mineralization in Western Junggar,北京:科学出版社,1993.
[28] Sillitoe RH,Gold-rich porphyry copper deposits:Descriptive and genetic models and their role in exploration and discovery,2000.
[29] 宋会侠.郭国林.焦学军.刘玉琳 新疆包古图斑岩铜矿伴生元素金和银赋存状态初步研究 [J].-岩石矿物学杂志2007(4)
[30] Song HX,Liu YL,Qu WJ,Song B Zhang R and Cheng Y,Geological characters of Baogutu porphyry copper deposit in Xinjiang,NW China,Acta Petrologica Sinica,2007(7).
[31] 涂光炽.李朝阳 浅谈比较矿床学 [J].-地球化学2006(1)
[32] Sun SS,McDonough WF,Chemical and isotopic sys-tematicss of oceanic basalts:Implications for mantle composition and processes,Special Publication.Geological Society of London,1989.
[33] Ulrich T,Heinrich CA,Geology and alteration geochemistry of the porphyry Cu-Au deposit at Bajo de la Alumbrera Argentina,Economic Geology,2001.
[34] Wang GR,Cheng SD,Yang SD,Zhang ZM and Ou YS,Explanation for the Tectonic Formation Map of the North Xinjiang and Neighbouring Country,WuHan:China University of Geoscience Press,1996.
[35] Wang JB,Xu X,Postcollisional Tectonic Evolution and Metallogenesis in Northern Xinjiang China,Acts Geologica Sinica,2006(1).
[36] Wang JB,Wang YW,Wang LI,The Junggar immature continental crust province and its mineralization,Acta Geologica Sinica,2004(2).
[37] 王瑞.朱永峰 西准噶尔宝贝金矿地质与容矿火山岩的锆石SHRIMP年龄 [J].-高校地质学报2007(3)
[38] Xiao WJ,Han CM,Yuan C,Sun M,Shoufa Lind,Chen HL,Li ZL,Li JL and Sun S,Middle Cambrian to Permian subductionrelated accretionary orogenesis of Northern Xinjiang,NW China:Implications for the tectonic evolution of central Asia,Journal of Asian Earth Sciences,2008.
[39] Xu FJ,Xia F,Geological characteristics of Baogutu copper-gold porphyry deposit in western Junggar,Xinjiang non-ferrous metals,2003(zk).
[40] 徐新.陈川.丁天府.刘兴义.李华芹 准噶尔西北缘早侏罗世玄武岩的发现及地质意义 [J].-新疆地质2008(1)
[41] 张弛.黄萱 新疆西准噶尔蛇绿岩形成时代和环境的探讨 [J].-地质论评1992(6)
[42] 张连昌.万博.焦学军.张锐 西准包古图含铜斑岩的埃达克岩特征及其地质意义 [J].-中国地质2006(3)
[43] 张锐.张云孝.佟更生.汪疆.李龙乾 新疆西准包古图地区斑岩铜矿找矿的重大突破及意义 [J].-中国地质2006(6)
[44] 陈晔.孙明新.张新龙 西准噶尔巴尔鲁克断裂东南侧石英闪长岩锆石SHRIMP U-Pb测年 [J].-地质通报2006(8)
[45] 成勇.张锐 新疆西准包古图地区铜金矿成矿规律浅析 [J].-地质与勘探2006(4)
[46] 韩宝福.季建清.宋彪.陈立辉.张磊 新疆准噶尔晚古生代陆壳垂向生长(Ⅰ)--后碰撞深成岩浆活动的时限 [J].-岩石学报2006(5)
[47] 胡霭琴,王中刚,涂光炽,新疆北部地质演化及成岩成矿规律,北京:科学出版社,1997.
[48] 李华芹,谢才富,常海亮,新疆北部有色贵金属矿床成矿作用年代学,北京:地质出版社,1998.
[49] 孟祥金.侯增谦.高永丰.曲晓明.黄卫 碰撞造山型斑岩铜矿蚀变分带模式--以西藏冈底斯斑岩铜矿带为例 [J].-地学前缘2004(1)
[50] 申萍.沈远超.刘铁兵.卢洁瑾.魏锦萍.宋国学.孟磊 新疆西北缘晚古生代金铜成矿作用与构造演化 [J].-岩石学报2008(5)
[51] 申萍 新疆萨吾尔金矿带构造-流体地球化学及成矿作用 [D].2004
[52] 沈远超,金成伟,齐进英,西准噶尔金矿化集中区的成矿模式和形成机理,北京:科学出版社,1993.
[53] 沈远超,金成伟,西准噶尔地区岩浆活动与金矿化作用,北京:科学出版社,1993.
[54] 宋会侠.郭国林.焦学军.刘玉琳 新疆包古图斑岩铜矿伴生元素金和银赋存状态初步研究 [J].-岩石矿物学杂志2007(4)
[55] 宋会侠.刘玉琳.屈文俊.宋彪.张锐.成勇 新疆包古图斑岩铜矿矿床地质特征 [J].-岩石学报2007(8)
[56] 苏玉平.唐红峰.侯广顺.刘丛强 新疆西准噶尔达拉布特构造带铝质 A型花岗岩的地球化学研究 [J].-地球化学2006(1)
[57] 王广瑞,成守德,杨树德,张致民,欧阳恕,新疆北部及邻区构造建造图说明书,武汉:中国地质大学出版社,1996.
[58] 王京彬.徐新 新疆北部后碰撞构造演化与成矿 [J].-地质学报2006(1)
[59] 王瑞.朱永峰 西准噶尔宝贝金矿地质与容矿火山岩的锆石SHRIMP年龄 [J].-高校地质学报2007(3)
[60] 徐新.陈川.丁天府.刘兴义.李华芹 准噶尔西北缘早侏罗世玄武岩的发现及地质意义 [J].-新疆地质2008(1)
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