云南普朗印支期超大型斑岩铜矿床：岩石学及年代学特征
The Indosinian Pulang superlarge porphyry copper deposit in Yunnan,China:Petrology and chronology.
-
摘要: 普朗斑岩铜矿位于云南西北晚三叠世义敦岛弧南段的滇西中甸弧内。义敦岛弧北部产有著名的呷村式黑矿型块状硫化物矿床,南部大量发育斑岩型铜矿床,普朗斑岩铜矿床即是其中的典型代表。普朗矿床由南、北两个复式岩体(矿段)组成,两个矿段均由一系列NW向构造控制的石英闪长玢岩、石英二长斑岩小岩株组成,是普朗铜矿区的主体,探明铜矿石量1．6亿吨,铜平均品位0．57%,铜金属量114万吨,伴生金金属量28．80吨,金品位0．18g/t;钼6399吨,品位0．004%。普朗斑岩铜矿床远景储量400万吨以上,为一个具有超大型规模远景储量的斑岩型铜矿床。普朗斑岩体容矿围岩SiO_2＞56%,MgO 1．34%～2．73%,Sr 661×10~(-6)～909×10~(-6),Y 10．78×10~(-6)～17．92×10~(-6),Yb 1．07×10~(-6)～1．87×10~(-6),LREE富集,δEu 0．83～0．93,Sr/Y比值22～64,K_2O/Na_2O比值0．52,具有与洋壳俯冲产生的埃达克岩(Ⅰ型埃达克岩)相似的地球化学特征。普朗斑岩铜矿形成于印支期,在我国斑岩铜矿床中具有其特殊性(不同于青藏高原喜马拉雅期斑岩铜矿带,如冈底斯斑岩铜矿带、玉龙斑岩带等;也不同于古亚洲成矿域的海西期斑岩铜矿带,如土屋-延东斑岩铜矿带,以及中国东部的燕山期斑岩铜矿带,如德兴斑岩铜矿),无论对中甸岛孤带的基础地质还是矿产资源评价预测的研究,该类矿床都具有重要的意义。普朗斑岩铜矿床含矿黑云石英二长斑岩的钾硅酸盐化(黑云母化和钾长石化)的成矿热液活动时间为235．4±2．4Ma～221．5±2．0Ma之间,石英-辉钼矿阶段的辉钼矿成矿(Re-Os)年龄大致为213±3．8 Ma;对矿区主矿体的热液黑云母单矿物的~(40)Ar/~(39)Ar测年,无论是含铜钼的矿化岩体,还是仅含铜的斑岩体,其成矿年龄(坪年龄)变化于为214．58±0．91Ma至216．0±1Ma之间,与辉钼矿Re-Os年龄非常接近,为晚三叠世诺利期。这表明普朗斑岩铜矿床的成矿作用在印支期完成。
-
Key words:
- Indosinian /
- Superlarge porphyry copper deposit /
- Pulang /
- Yunnan
-
-
[1] Barra F,Ruiz J,Mathur R and Titley S.2003. A Re-Os study of sulfide minerals from the Bagdad porphyry Cu-Mo deposit,northern Arizona,USA.Mineralium Deposita,38:585-596
[2] 谭雪春,曾群望,苏文宁.1985.滇西东部斑岩和斑岩铜矿.云南省地质科学研究所.
[3] Bernard A,Symonds RS and Rose WI.1990. Volatile transport and deposition of Mo,W and Re in high temperature magmatic fluids.Applied Geochemistry,5:317-326
[4] Berzina AN,Sotnikov Ⅵ,Eliopoulos DG and Economou-Eliopoulos M.2003b.Rhenium in molybdenites from porphyry Cu-Mo deposits of Russia (Siberia) and Mongolia.In:Eliopoulos et al.(eds).Mineral Exploration and Sustainable Development,235 -238
[5] Berzina AN,Stein H J,Zimmermen A and Sotnikov Ⅵ.2003. Re-Os ages for molybdenite from porphyry Cu-Mo and greisen Mo-W deposits of Southern Siberia (Russia) preserve metallogenic record.In:Eliopoulos et al.(eds).Mineral Exploration and Sustainable Development,231-234
[6] Chesley J and Ruiz J.1997. Preliminary Re-Os dating on molybdenite mineralization from the Bingham Canyon porphyry copper deposit,Utah.In:Thompson TB (ed).Geology and ore deposits of the Quirrh and Wasatch Mountains,Utah.SEG Guideb.Ser,29:165-169
[7] Defant MJ and Drummond MS.1990. Derivation of some modern arc magmas by melting of young subducted lithosphere.Nature,347:662-665
[8] Drummond MS and Defant MJ.1990. A model for trondhjemitetonalite-dacite genesis and crustal growth via slab melting:Archaean to modern comparisons.J.Geophys.Res.,95:21503-21521
[9] Du AD,He HL and Yin NW.1994. A study of the Rhenium-Osmium Geochronometry of Molybdnites.Acta Geologica Sinica.68 (4):339 -347 (in Chinese with English abstract)
[10] Du AD,Wang SX,Sun DZ,Zhao DN and Liu DY.2001. Precise ReOs dating of Molybdenite using Carius tube,NTIMS and ICPMS.In:Piestrzynski,et al (eds).Mineral Deposits at the 21st Century,405-407
[11] Hou ZQ,Ma HW,Zaw K,Zhang YQ,Wang MJ,Wang Z,Pan GT and Tang RL.2003. The Himalayan Yulong porphyry copper belt:product of large-scale strike-slip faulting in Eastern Tibet.Econ.Geol.,98:125-145
[12] Hou ZQ,Wu SY and Tetsuro U.1996. Silicon and oxygen isotopic composition of cherts from the Gacuz Kuroko-type deposit,Sichuan,and comparison with silica chimneys from the modern seafloor.Geological Review,42 (6):531-539 (in Chinese with English abstract)
[13] Hou ZQ.1991. Characteristics of tectono-magmatic evolution of Yidun island arc in Sanjiang region.In:Geological Collected Works of Qinghai-Tibet Plateau,(21),153-156 (in Chinese with English abstract)
[14] Liu YC and Li ZW.1999. On the geology and tectonic significance of Triassic bimodal volcanic rocks in Eryuan.Yunnan Geology,18(4):405 -412 (in Chinese with English abstract)
[15] Ludwig KR.2001. Isoplot/Ex version 2.49. A geochronlogical toolkit for Microsoft Excel.Berkeley Geochronological Center Sepc.Publ.1 a
[16] McCandless TE,Ruiz J and Campbell AR.1993. Rhenium behavior in molybdenite in hypogene and near-surface environments:Implications for Re-Os geochronology.Geochim.Cosmochim.Acta57:889-905
[17] Mo XX,Lu FX,Shen SY,et al.1993,Sanjiang Tethyan volcanism and related mineralization.Beijing:Geological Publishing House,267(in Chinese with English abstract)
[18] Pan GT,Xu Q,Hou ZQ,Wang LQ,Du DX,Mo XX,Li DM,Wang M J,Li XZ,Jiang XS,and Hu YZ.2003. Arckipelagic orogenesis,metallogenic systems and assessment of the mineral resources along the Nujiang-Lancangjiang-Jinshajiang area in southwestern China.Beijing:Geological Publishing House,420(in Chinese with English abstract)
[19] Perello J,Cox D,Garamjav D,Sanjdorj S,Diakov S,Schissel D,Munkhbat T-O and Oyun D.2001. Oyu Tolgoi,Mongolia:SiluroDevonian porphyry Cu-Au-(Mo) and high-sulfidation Cu mineralization with a Cretaceous chalcocite blanket.Econ.Geol.,96:1407-1428
[20] Sha SL.1988. Glaucophane schist in the conjunction of Zhongdian,Yunnan and Muli,Sichuan (Louji-Wachang).Yunnan Geology,7(1):82-85 (in Chinese)
[21] Sha SL.2002. The determination of Cenozoic nappe structures of Diancang Mts.and their geological significance.Yunnan Geology,
[22] (3):250 -255 (in Chinese with English abstract)21. Shirey SB and Walker RJ.1995. Carius tube digestion for low-blank rhenium-osmium analysis.Anal.Chem.,67:2136-2141
[23] Smoliar MI.,Walker RJ and Morgan JW.1996. Re-Os ages of group Ⅱ A,ⅢA,ⅣA and B iron meteorites.Science,271:1099-1102
[24] Ward CD and McArthur JM.1992. Rare earth element behavior during evolution and alteration of the Dartmoor granite,SW England.Journal of Petrology,33:785 -815
[25] Yang YQ,Hou ZQ,Huang DH,et al.2002. Collision Orogenic Process and Magrnatic Metallogenic System in Zhongdian Island Arc.Acta Geoscientia Sinica,23 (1):17-24 (in Chinese with English abstract)
[26] Yin NW and Huang DH.1994. Review of Re-Os isotope systematics and its application to geology.Mineral Deposits of Foreign Countries,(1):1-11(in Chinese)
[27] Yunnan Bureau of Geology and Mineral Resources.1990. Regional Geology of Yunnan Province.Beijing:Geological Publishing House(in Chinese with English abstract)
[28] Zeng PS,Li H,Luo XM and Yang WG.2000. The prospecting of Cu-Au in Zhongdian,northwestof Yunnan.Gold Geology,6(3):13-18(in Chinese with English abstract)
[29] Zeng PS,Mo XX,Yu XH and Lu ZQ.1999. Preliminary research on the intermediate-acidic porphyries and their ore-bearing in Zhongdian area,Northwestern Yunnan.Acta Geoscientia Sinica,20(Supp.):359 -366(In Chinese with English abstract)
[30] Zeng PS,Mo XX,Yu XH,Hou ZQ,Xu QD,Wang HP,Li H and Yang CZ.2003a.Porphyries and porphyry copper of Zhongdian area in NW Yunnan.Mineral Deposits,22:325-333 (in Chinese with English abstract)
[31] Zeng PS,Wang HP,Mo XX,et al.2004. Tectonic setting and prospects of porphyry copper deposits in Zhongdian island arc belt.Acta Geoscientica Sinica,25(5):535-540 (in Chinese with English abstract)
[32] Zeng PS.2000. Volcanic-intrusive complex and its relationship with copper and gold mineral resources in Zhongdian area,Yunnan Province,China.Supervisor:Prof.Mo Xuanxue.Beijing:China University of Geosciences.130
[33] Zhu DC,Duan LP,Liao ZL and Pan GT.2002. Discrimination for two kinds of adakites.J.Mineral.Petrol.,22 (3):5-9 (in Chinese with English abstract)
[34] 杜安道,何红蓼,殷宁万等.1994.辉钼矿的铼-锇同位素地质年龄测定方法研究.地质学报,68(4):339-347
[35] 杜安道,赵敦敏,王淑贤,孙德忠,刘敦一.2001. Carius管溶样和负离子热表面电离质谱准确测定辉钼矿铼-锇同位素地质年龄.岩矿测试,20(4):247-252
[36] 侯增谦,侯立纬,叶庆同等.1995.三江地区义敦岛弧构造-岩浆演化与火山成因块状硫化物矿床.北京:地震出版社
[37] 侯增谦,吴世迎,Urabe.1996.四川呷村黑矿型矿床的硅质岩的硅、氧同位素组成及其与现代海底硅质烟囱比较研究.地质论评,42(6):531～539
[38] 侯增谦,杨岳清,王海平,曲晓明,吕庆田,黄典豪,吴宣志,余金杰,唐绍华,赵金花.2003.三江义敦岛弧碰撞造山过程与成矿系统.北京:地质出版社,1-345
[39] 侯增谦.1991.三江地区义敦岛弧构造-岩浆演化特征.见:青藏高原地质文集,(21).北京地质出版社,153-165
[40] 刘宇淳,李志伟.1999.洱源地区三叠系双峰式火山岩的地质特征及大地构造意义.云南地质,18(4):405-412
[41] 莫宣学,路风香,沈上越等.1993.三江特提斯火山作用与成矿.北京:地质出版社
[42] 潘桂棠,徐强,侯增谦,王立全,杜德勋,莫宣学,李定谋,汪名杰,李兴振,江新胜,胡云中.2003.西南"三江"多岛弧造山过程成矿系统与资源评价.北京:地质出版社,420
[43] 沙绍礼.1988.云南中甸、四川木里接壤地带(洛吉-瓦厂)的蓝闪石片岩.云南地质,7(1):82-85
[44] 沙绍礼.2002.点苍山新生代推覆构造的确立及其地质意义.云南地质,21(3):250-255
[45] 殷宁万,黄典豪.1994.铼-锇同位素体系的研究现状及其在地质学中的应用.国外矿床地质,(1):1-11
[46] 云南省地质矿产局.1990.云南省区域地质志.北京:地质出版社
[47] 曾普胜.2000a.云南省中甸地区火山-侵入杂岩及其与铜金矿产的关系[博士学位论文].北京:中国地质大学,130
[48] 朱弟成,段丽萍,廖忠礼,潘桂棠.2002.两类埃达克岩(Adakite)的判别.矿物岩石,22(3):5-9
[49] 曾普胜,李红,罗锡明,杨伟光.2000b.滇西北中甸地区的铜金找矿远景.黄金地质,6(3):13-18
[50] 曾普胜,莫宣学,喻学惠,侯增谦,徐启东,王海平,李红,杨朝志.2003a.滇西北中甸斑岩及斑岩铜矿.矿床地质,22(4):393-400
[51] 曾普胜,莫宣学,喻学惠,卢振权.1999.滇西北中甸地区中酸性斑岩及其含矿性初步研究.地球学报,20(增刊):359～336
-
计量
- 文章访问数: 10377
- PDF下载数: 10764
- 施引文献: 0
下载: