甘孜-理塘结合带南段德工牛场铜多金属矿区斑岩体地球化学特征Geochemistry Characteristics of Granodiorite Porphyry in Degongniuchang Cu Polymetallic Deposit,Southern Section of Garzê-Litang Suture Zone
马鹏程;谢云喜;高贤君;王富东;彭东;李虎杰;徐刚;邓绍军;
摘要(Abstract):
德工牛场铜多金属矿床是位于甘孜-理塘结合带南段的一处斑岩型矿床,矿区与成矿关系最为密切的斑岩体为花岗闪长斑岩。该岩体与甘孜-理塘洋演化以及与斑岩型矿床间的关系是值得深入研究的课题。对矿区花岗闪长斑岩进行了地球化学研究,结果表明:花岗闪长斑岩具有高硅(w(SiO_2)66.35%~71.86%)、高碱(w(K_2O+Na_2O)3.63%~7.08%)、高钾(w(K_2O)3.11%~4.57%)和过铝质(A/CNK 0.96~1.49)等特征,里特曼组合指数σ为0.56~1.74;稀土元素总量偏少(w(ΣREE)111.56×10~(-6)~121.00×10~(-6)),轻重稀土元素分馏明显((La/Yb)_N6.63~9.51);相对富集Rb、K、La等大离子亲石元素(LILE)及高场强元素(HFSE)Th、U,相对亏损Nb、Ta、P、Ti等高场强元素及部分大离子亲石元素(如Ba、Sr);Fe_2O_3/FeO比值平均为1.11。综合地球化学特征表明,德工牛场花岗闪长斑岩为高钾钙碱性过铝质I型花岗岩,是典型的壳幔混源成因类型,具有岛弧花岗岩的特征;结合地质年龄资料(216Ma)与区域构造演化特征,判定其为印支末期甘孜-理塘洋向西侧中咱地块俯冲时在强烈的岩浆活动中形成,矿床的花岗闪长斑岩在成岩构造事件与成矿岩石特征方面与义敦岛弧内典型斑岩型矿床的斑岩具有高度的相似性。
关键词(KeyWords): 甘孜-理塘结合带;德工牛场;斑岩型矿床;花岗闪长斑岩;地球化学特征
基金项目(Foundation): 国家自然科学基金项目(41603041);; 西南科技大学研究生创新基金项目(18ycx045);; 矿床地球化学国家重点实验室开放课题(201505)
作者(Author): 马鹏程;谢云喜;高贤君;王富东;彭东;李虎杰;徐刚;邓绍军;
Email:
DOI: 10.19509/j.cnki.dzkq.2018.0603
参考文献(References):
- [1] Deng J,Wang Q F,Li G J,et al.Tethys tectonic evolution and its bearing on the distribution of important mineral deposits in the Sanjiang region,SW China[J].Gondwana Research,2014,26(2):419-437.
- [2]莫宣学,潘桂棠.从特提斯到青藏高原形成:构造-岩浆事件的约束[J].地学前缘,2006,13(6):43-51.
- [3]李文昌.“西南三江”古特提斯构造演化研究新进展和新问题[C]∥沈爱民.新观点新学说学术沙龙文集55:板块汇聚、地幔柱对云南区域成矿作用的重大影响.昆明:中国科学技术出版社,2011.
- [4]邓军,葛良胜,杨立强.构造动力体制与复合造山作用:兼论三江复合造山带时空演化[J].岩石学报,2013,29(4):1099-1114.
- [5]李文昌,余海军,尹光候,等.西南“三江”格咱岛弧斑岩成矿系统[J].岩石学报,2013,29(4):1129-1144.
- [6]侯增谦,潘桂棠,王安建,等.青藏高原碰撞造山带:Ⅱ.晚碰撞转换成矿作用[J].矿床地质,2006,25(5):521-543.
- [7]侯增谦,曲晓明,杨竹森,等.青藏高原碰撞造山带:Ⅲ.后碰撞伸展成矿作用[J].矿床地质,2006,25(6):629-651.
- [8]侯增谦,杨竹森,徐文艺,等.青藏高原碰撞造山带:I.主碰撞造山成矿作用[J].矿床地质,2006,25(4):337-358.
- [9]邓军,王长明,李文昌,等.三江特提斯复合造山与成矿作用研究态势及启示[J].地学前缘,2014,21(1):52-64.
- [10]邓军,杨立强,王长明.三江特提斯复合造山与成矿作用研究进展[J].岩石学报,2011,27(9):2501-2509.
- [11]Peng T,Zhao G,Fan W,et al.Late Triassic granitic magmatism in the Eastern Qiangtang,Eastern Tibetan Plateau:Geochronology,petrogenesis and implications for the tectonic evolution of the Paleo-Tethys[J].Gondwana Research,2015,27(4):1494-1508.
- [12] Lehmann B,Zhao X,Zhou M,et al.Mid-Silurian back-arc spreading at the northeastern margin of Gondwana:The Dapingzhang dacite-hosted massive sulfide deposit,Lancangjiang zone,southwestern Yunnan,China[J].Gondwana Research,2013,24(2):648-663.
- [13]Fan J,Li C,Xie C,et al.Remnants of late Permian-Middle Triassic ocean islands in northern Tibet:Implications for the latestage evolution of the Paleo-Tethys Ocean[J].Gondwana Research,2017,44(2):7-21.
- [14]四川省地质矿产开发局区域地质调查队.德工牛场斑岩型铜矿普查地质报告[R].成都:四川省地质矿产开发局区域地质调查队,2013.
- [15]Hou Z Q.Tectono-magmatic evolution of the Yidun island-arc and geodynamic setting of kuroko-type sulfide deposits in Sanjiang Region,China[J].Resource Geology,1993,17:336-350.
- [16]侯增谦,候立纬,叶庆同,等.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[M].北京:地震出版社,1995.
- [17]侯增谦,曲晓明,周继荣,等.三江地区义敦岛弧碰撞造山过程:花岗岩记录[J].地质学报,2001,75(4):484-497.
- [18]李兴振,刘文均,王义昭,等.西南三江地区特提斯构造演化与成矿:总论[M].北京:地质出版社,1999.
- [19]李兴振,江新胜,孙志明,等.西南三江地区碰撞造山过程[M].北京:地质出版社,2002.
- [20]潘桂棠,徐强,侯增谦,等.西南“三江”多岛弧造山过程、成矿系统与资源评价[M].北京:地质出版社,2003.
- [21]钟大赉.滇川西部古特提斯造山带[M].北京:科学出版社,1998.
- [22]骆耀男,愈如龙.西南三江地区造山演化过程及成矿时空分布[J].矿物岩石,2001,21(3):153-159.
- [23]莫宣学,邓晋福,董方浏,等,西南三江造山带火山岩-构造组合及其意义[J].高校地质学报,2001,7(2):121-138.
- [24]杨海军,肖龙,吴涛,等.义敦岛弧带稻城贡巴纳过铝质花岗岩成因及构造意义[J].地质科技情报,2013,32(4):55-63.
- [25]邓军,王庆飞,李龚健.复合造山和复合成矿系统:三江特提斯例析[J].岩石学报,2016,32(8):2225-2247.
- [26]邓军,侯增谦,莫宣学,等.三江特提斯复合造山与成矿作用[J].矿床地质,2010,29(1):37-42.
- [27]侯增谦,杨岳清,曲晓明,等.三江地区义敦岛弧造山带演化和成矿系统[J].地质学报,2004,78(1):109-120.
- [28]李文昌,潘桂棠,侯增谦,等.西南“三江”多岛弧盆-碰撞造山成矿理论与勘查技术[M].北京:地质出版社,2010.
- [29]邹光富,毛英,毛琼,等.西南三江地区大地构造演化与成矿作用[J].矿物岩石,2017,37(1):15-29.
- [30]Ma P C,Wang F D,Xie Y X,et al.Geochemistry characteristics of granodiorite porphyry in the Degongniuchang Copper Deposit,Muli,Sichuan,Province,China[J].Acta Geologica Sinica,2017,91(Supp1):187-188.
- [31]潘桂棠,王立全,张万平,等.青藏高原及邻区大地构造图及说明书(1∶1 500 000)[M].北京:地质出版社,2013.
- [32]中国地质调查局.中华人民共和国1∶50万数字地质图数据库[DB/CD].北京:中国地质调查局,2001.
- [33]陈炳蔚,王铠元,刘万熹,等.怒江-澜沧江-金沙江地区大地构造[M].北京:地质出版社,1987.
- [34]张能德,曹亚文,廖远安,等.四川甘孜-理塘裂谷带地质与成矿[M].北京:地质出版社,1998.
- [35]陈明,彭刚,唐博,等.木里德工牛场斑岩铜矿矿床地质特征及找矿[J].四川地质学报,2014,34(4):543-546.
- [36]Angelo P,Taylor S R.Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area,Northern Turkey[J].Contrib.Mineral.Petrol.,1976,58:63-81.
- [37]Maniar P D,Piccoli P M.Tectonic discrimination of granitoids[J].Geological Society of America Bulletin,1989,101(5):635-643.
- [38] Middlemost E A K.Naming materials in the magma/igneous rock system[J].Earth Science Reviews,1994,37:215-224.
- [39]Sylvester P J.Post-collisional strongly peraluminous granites[J].Lithos,1998,45:29-34.
- [40]Anders E,Grevesse N.Abundances of the elements:Meteoritic and solar[J].Geochimica et Cosmochimica Acta,1989,53(1):197-214.
- [41]Sun S S,McDonough W F.Chemical and isotopic systematic of oceanic basalts:Implications for mantle composition and processes[C]∥Sanrder A D,Norry M J.Magmatism in theocean basins.[S.l.]:Geological Society of London Special Publication,1989,42(1):313-345.
- [42]张旗,王焰,李承东,等.花岗岩的Sr-Yb分类及其地质意义[J].岩石学报,2006,22(9):2249-2269.
- [43]李昌年.火成岩微量元素地球化学[M].武汉:中国地质大学出版社,1992.
- [44]马鸿文.花岗岩成因类型的判别分析[J].岩石学报,1992,8(4):341-350.
- [45]Ryerson F J,Watson E B.Rutile saturation in magmas:Implications for Ti-Nb-Ta depletion in island-arc basalts[J].Earth and Planetary Science Letters,1987,86:225-239.
- [46]Wu F Y,Jahn B M,Wilde S A,et al.Highly fractionated I-type granites in NE China(I):Geochronology and petrogenesis[J].Lithos,2003,66:241-273.
- [47]Green T H,Pearson N J.An experimental study of Nb and Ta partitioning be-tween Ti-rich minerals and silicate liquids at high pressure and temperature[J].Geochimica et Cosmochim Acta,1987,51(1):55-62.
- [48]Green T H.Significance of Nb/Ta as an indicator of geochemical processes in the crust mantle system[J].Chemical Geology,1995,120(3/4):347-359.
- [49]Pearce J A,Harris H B W,Tindle A G.Trace element discrimination diagrams for the tectonic interpretation of grantic rocks[J].Journal of Petrology,1984,25(4):956-983.
- [50]吕伯西,王增,张能德,等.三江地区花岗岩类及其成矿专属性[M].北京:地质出版社,1993.
- [51]张旗,钱青,王焰,等.造山带火成岩地球化学研究[J].地学前缘,1999,6(3):113-120.
- [52]任江波,许继峰,陈建林,等,“三江”地区中甸弧普朗成矿斑岩地球化学特征及其成因[J].岩石矿物学杂志,2011,30(4):581-592.
- [53]李文昌,刘学龙,曾普胜,等,云南普朗斑岩型铜矿成矿岩体的基本特征[J].中国地质,2011,38(2):403-414.