刘亮;何学锋;李江涛;杨鹏涛;梁斌;苏画;杨宇东;刘应忠;戴智慧;

• 1:四川省地质矿产勘查开发局川西北地质队
• 2:西南科技大学环境与资源学院
• 3:贵州省地质调查院
• 4:中国科学院地球化学研究所

摘要(Abstract)：

新疆哈尔里克造山带广泛分布着古生代的侵入岩体,其成因对正确认识该区岩浆的动力学背景具有重要意义。对位于哈尔里克造山带中段东部的沁城天生圈岩体进行了岩石学、地球化学及锆石U-Pb年代学研究,探讨其岩石成因及构造属性,以期为解决哈尔里克造山带的地质构造演化提供依据。沁城天生圈岩体岩性为石英闪长岩,LA-ICP-MS锆石U-Pb定年结果表明,石英闪长岩形成时代为(446.1±3.3)Ma(晚奥陶世),属加里东期构造岩浆活动的产物。岩石地球化学分析结果显示,其w(SiO2)介于57.74%~62.34%之间,中钾-高钾(1.71%~3.01%),富CaO(4.01%~8.45%)、贫Al2O3(15.03%~16.89%),w(MgO)介于1.85%~3.97%之间,Mg#值为37.15~48.29,铝饱和指数值A/CNK为0.78~0.99,属准铝质中钾—高钾钙碱性岩石系列;且岩石稀土元素质量分数较低(59.74×10-6~205.53×10-6),轻稀土元素分馏较重稀土元素明显,富集Rb、Ba等大离子亲石元素(LILE)和活泼的不相容元素(Th、U),相对亏损Nb、Ta、Ti、P等高场强元素(HFSE),显示出与典型岛弧型岩浆岩相似的特征。有关微量元素、稀土元素的相关图解以及宏观地质特征指示,沁城天生圈岩体石英闪长岩的形成受俯冲作用影响,其岩浆源区应为增厚大陆下地壳物质部分熔融的产物,并可能含有幔源基性岩浆的加入。此外,综合区域地质资料分析,认为早古生代期间(中奥陶世-早志留世),哈尔里克造山带存在大面积的与真正岛弧演化有关的加里东期岩浆活动,哈尔里克早古生代岛弧的形成可能与东准噶尔南部克拉麦里洋向南俯冲作用有关。

关键词(KeyWords)： LA-ICP-MS锆石U-Pb定年;地球化学;早古生代岛弧;克拉麦里洋;哈尔里克造山带

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(41472310);; 中国地质调查局项目“新疆天山哈密地区五幅1∶5万区域地质矿产调查”(12120113042400)

作者(Author): 刘亮;何学锋;李江涛;杨鹏涛;梁斌;苏画;杨宇东;刘应忠;戴智慧;

Email:

DOI:

参考文献(References)：

• [1]Badarch G,Cunningham W D,Windley B F.A new terranesubdivision for Mongolia:Implications for the Phanerozoic crustal growth of Central Asia[J].Journal of Asian Earth Sciences,2002,21(1):87-110.
• [2]Xiao W J,Zhang L C,Qin K Z,et al.Paleozoic accretionary and collisional tectonics of the eastern Tianshan(China):Implications for the continental growth of central Asia[J].American Journal of Science,2004,304(4):370-395.
• [3]李锦轶,何国琦,徐新,等.新疆北部及邻区地壳构造格架及其形成过程的初步探讨[J].地质学报,2006,80(1):148-168.
• [4]马星华,陈斌,王超,等.早古生代古亚洲洋俯冲作用:来自新疆哈尔里克侵入岩的锆石U-Pb年代学、岩石地球化学和Sr-Nd同位素证据[J].岩石学报,2015,31(1):89-104.
• [5]马瑞士,王赐银,叶尚夫.东天山构造格架及地壳演化[M].南京:南京大学出版社,1993:1-225.
• [6]楼法生,唐春花.新疆巴里坤红井子地区石炭纪火山岩及其大地构造环境分析[J].新疆地质,1995,13(1):67-76.
• [7]王赐银,舒良树,赵明,等.东天山北部哈尔里克晚古生代推覆构造与岩浆作用研究[J].高校地质学报,1996,2(2):198-206.
• [8]李锦轶.新疆东部新元古代晚期和古生代构造格局及其演变[J].地质论评,2004,50(3):304-322.
• [9]张传恒,刘典波,张传林,等.新疆博格达山初始隆升时间的地层学标定[J].地学前缘,2005,12(1):294-302.
• [10]赵明,舒良树,王赐银.东疆哈尔里克变质带变质作用特征及形成构造环境研究[J].高校地质学报,1997,3(1):40-50.
• [11]成守德,张湘江.新疆大地构造基本格架[J].新疆地质,2000,18(4):293-296.
• [12]靳刘圆,张济,朱志新,等.哈尔里克山古生代火山岩地质特征及构造意义[J].新疆地质,2013,31(3):173-179.
• [13]刘德权,唐延龄,周汝洪.新疆北部古生代地壳演化及成矿系列[J].矿床地质,1992,11(4):307-314.
• [14]王宗秀,周高志,李涛.对新疆北部蛇绿岩及相关问题的思考和认识[J].岩石学报,2003,19(4):683-691.
• [15]李文明,任秉琛,杨兴科,等.东天山中酸性侵入岩浆作用及其地球动力学意义[J].西北地质,2002,35(4):41-64.
• [16]孙桂华,李锦轶,朱志新,等.新疆东部哈尔里克山片麻状黑云母花岗岩锆石SHRIMP U-Pb定年及其地质意义[J].新疆地质,2007,25(1):4-10.
• [17]孙桂华,李锦轶,高立明,等.新疆东部哈尔里克山闪长岩锆石SHRIMP U-Pb定年及其地质意义[J].地质论评,2005,51(4):463-469.
• [18]Anderson T.Correction of Pb in U-Pb analyses that do not report 204Pb[J].Chemical Geology,2002,192:59-79.
• [19]Ludwig K R.User's manual for Isoplot 3.00.A geochronological Toolkit for Microsoft Excel[M].California:Berkeley Geochronology Center,Special Publication,2003.
• [20]Yuan H L,Wu F Y,Gao S,et al.Determination of U-Pb age and rare earth element concentrations of zircons from Cenozoic intrusions in northeastern China by laser ablation ICP-MS[J].Chinese Science Bulletin,2003,48(22):2411-2421.
• [21]Qi L,Hu J,Gregoire D C.Determination of trace elements in granites by inductively coupled plasma mass spectrometry[J].Talanta,2000,51(3):507-513.
• [22]Koschek G.Origin and significance of the SEM cathodoluminescence from zircon[J].Journal of Microscopy,1993,171(3):223-232.
• [23]Middlemost E A K.Naming materials in the magma/igneous rock system[J].Earth-Sci.Rev.,1994,37:215-224.
• [24]Ewart A.The mineralogy and petrology of Tertiary:Recent orogenic volcanic rock with special reference to the andesitic-basaltic compositional range[M]∥Thorpe R S.Andesites.Chichester:Wiley,1982:25-87.
• [25]Maniar P D,Piccoli P M.Tectonic discrimination of granitoids[J].Geological Society of American Bulletin,1989,101(5):635-643.
• [26]Altherr R,Holl A,Hegner E,et al.High-potassium,calc-alkaline I-type plutonism in the European Variscides:Northern Vosges(France)and northern Schwarzwald(Germany)[J].Lithos,2000,50(1/3):51-73.
• [27]Chappell B W.Aluminium saturation in I-and S-type granites and characterization of fractionated haplogranites[J].Lithos,1999,46:535-551.
• [28]陈炜,马昌前,宋志强,等.西藏冈底斯带中南部与俯冲有关的早侏罗世花岗闪长岩:锆石U-Pb年代学及地球化学证据[J].地质科技情报,2011,30(6):1-12.
• [29]段志明,张玉修,祝向平,等.松潘—甘孜南部玛孜措石英闪长岩的地球化学特征、同位素年龄及其构造意义[J].地质学报,2013,87(12):1874-1886.
• [30]Boynton W V.Geochemistry of the rare earth elements:Meteorite studies[M]∥Henderson P.Rare earth element geochemistry.Amsterdam:Elsevier,1984:63-114.
• [31]Sun S S,Mc Donough W F.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes[C]∥Saunders A D,Norry M J.Magmatism in the ocean basins.[S.l.]:Geological Society London Special Publications,1989,42(1):313-345.
• [32]Rollinson H R.Using Geochemical data:Evaluation,presentation,interpretations[M].London:Pearson Education Limited,1993:1-278.
• [33]Eby G N.Chemical subdivision of the A-type granitoids:Petrogenetic and tectonic implications[J].The Journal of Geology,1992,20(7):641-644.
• [34]Brown G C,Thorpe R S,Webb P C.The geochemical characteristics of granitoids in contrasting arcs and comments on magma sources[J].Journal of the Geological Society,1984,141(3):413-426.
• [35]Defant M J,Drummond M S.Derivation of some modern arc magmas by melting of young subducted ithosphere[J].Nature,1990,347:662-665.
• [36]Bailey J C.Geochemical criteria for a refined tectonic discrimination of orogenic andesites[J].Chemical Geology,1981,32(1/4):139-154.
• [37]Rogers G,Hawkesworth C J.A geochemical traverseacross the North Chilean Andes:Evidence for crust generation from the mantle wedge[J].Earth and Planetary Science Letters,1989,91(3):271-285.
• [38]Atherton M P,Petford N.Generation of sodium-rich magmas from newly underplated basaltic crust[J].Nature,1993,362:144-146.
• [39]Abratis M.Geochemical variations in magmatic rocks from southern Costa Rica as a consequence of Cocos Ridge subduction and uplift of the Cordillera de Talamance[D].Gttingen:Universitt zu Gttingen,1998.
• [40]Zheng Y C,Hou Z Q,Gong Y L,et al.Petro-genesis of Creataceous adakite-like intrusions of the Gangdese plutonic belt,Southern Tibet:Implications for Mid-ocean ridge subduction and crustal growth[J].Lithos,2014,190/191:240-263.
• [41]Yogodzinski G M,Key R W,Volynets O N,et al.Magnesian andesite in the western Aleutian Komandorsky region:Implications for slab melting and processes in the mantle wedge[J].Geological Society of America Bulletin,1995,107(5):505-519.
• [42]Hirose K,Kushiro I.Partial melting of dry peridotites a thigh pressure:Determination of composition of melts segregated from peridotite using aggregates of diamonds[J].Earth and Planetary Science Letters,1993,114:477-489.
• [43]Kamei A,Owada M,Nagao T,et al.High-Mg diorites derived from sanukitic HMA magmas,Kyushu Island,southwest Japan arc:Evidence from clinopyroxene and whole rock compositions[J].Lithos,2004,75:359-371.
• [44]Rapp R P,Shimzu N,Norman M D,et al.Reaction between slab-derived melts and peridotite in the mantle wedge:Experimental constraints at 3.8GPa[J].Chemical Geology,1999,160(4):335-356.
• [45]Guan Q,Zhu D C,Zhao Z D,et al.Crustal thickening prior to38 Ma in southern Tibet:Evidence from lower crust-derived adakitic magmatism in the Gangdese batholith[J].Gondwana Research,2012,21(1):88-99.
• [46]Hou Z Q,Pan X F,Li Q Y,et al.The giant Dexing porphyry Cu-Mo-Au deposit in east China:Product of melting of juvenile lower crust in an intracontinental setting[J].Mineralium Deposita,2013,48(8):1019-1045.
• [47]Rapp R P,Watson E B.Dehydration melting of metabasalt at8-32kbar:Implications for continental growth and crust-mantle recycling[J].Journal of Petrology,1995,36(4):891-931.
• [48]Rudnick R L,Gao S.Composition of the continental crust[J].Treatise on Geochemistry,2004,3:1-64.
• [49]Wedepohl K H.The composition of the continental crust[J].Geochimica et Cosmochimica Acta,1995,59(7):1217-1232.
• [50]Chen B,Tian W,Jahn B M,et al.Zircon SHRIMP U-Pb ages and in-situ Hf isotopic analysis for the Mesozoic intrusions in South Taihang,North China Craton:Evidence for hybridization between mantle-derived magmas and crustal components[J].Lithos,2008,102:118-137.
• [51]张海东,高海龙,刘建朝,等.南太行山平顺闪长岩体SHRIMP锆石U-Pb年龄、地球化学特征及地质意义[J].地质科技情报,2013,32(2):41-49.
• [52]岳相元,周雄,张永涛,等.青海引胜沟岩体的锆石U-Pb年代学、地球化学特征及其地质意义[J].地质科技情报,2016,35(4):29-37.
• [53]郭华春,钟莉,李丽群.新疆哈尔里克山口门子地区石英闪长岩年代研究及地质意义[J].地质通报,2006,25(8):928-931.
• [54]曹福根,涂其军,张晓梅,等.哈尔里克山早古生代岩浆弧的初步确定:来自塔水河一带花岗质岩体锆石SHRIMP U-Pb测年的证据[J].地质通报,2006,25(8):923-927.
• [55]Pearce J A,Harris N,Tindle A G.Trace element discrimination diagrams for the tectonic interpretation of granitic rocks[J].Journal of Petrology,1984,25(4):956-983.
• [56]Batchelor R A,Bowden P.Petrogenetic interpretation of granitoid rock series using multicationic parameters[J].Chemical Geology,1985,48(1/4):43-55.
• [57]李锦轶.新疆东准噶尔卡拉麦里地区古生代板块构造研究[D].北京:中国地质科学院,1988.
• [58]何国琦,李茂松,贾进斗,等.论新疆东准噶尔蛇绿岩的时代及其意义[J].北京大学学报:自然科学版,2001,37(6):852-858.
• [59]杨高学,李永军,吴宏恩,等.东准噶尔卡拉麦里地区黄羊山花岗岩和包体LA-ICP-MS锆石U-Pb测年及地质意义[J].岩石学报,2009,25(12):3197-3207.