东昆仑造山带大水沟中酸性侵入岩的形成时代及岩石地球化学特征
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摘要
对东昆仑造山带东段大水沟一带开展锆石U-Pb测年和岩石地球化学研究。获得英云闪长岩锆石U-Pb定年为(402±2)Ma,属早泥盆世华力西期。岩石地球化学特征显示:Al饱和指数A/CNK集中在0.946~1.077之间;轻重稀土比值LREE/HREE在2.94~18.93范围,显示轻稀土富集;δEu在0.01~0.85之间,属于Eu亏损型;δCe在0.95~1.23之间,反映出无异常—轻微富集。岩体整体显示以I型花岗岩为主的特点,结合构造环境判别图解,综合判断大水沟一带中酸性侵入岩属东昆仑东段早泥盆世后碰撞造山花岗岩。
The authors investigated zircon U-Pb dating and petrological geochemical characteristics in the east of East Kunlun orogenic belt. The results show that the U-Pb age of zircons in tonalite is( 402 ± 2) Ma,belonging to Early Devonian of Variscan. The petrological geochemical characteristics show that the aluminium saturation A/CNK index ranges from 0. 946 to 1. 077,and the ratio of light rare earth elements and heavy rare earth elements( LREE/HREE) is from 2. 94 to 18. 93,which indicates the enrichment of light rare earth elements. And the δEu parameter is between 0. 01 and 0. 85,belonging to europium depletion type. The δCe parameter is between 0. 95 and 1. 23,reflecting normal-slightly enrichment. Overall,the rocks are mainly by I-type granite.Combined with the tectonic discrimination diagrams,the authors concluded that intermediate-acid intrusive rocks in Dashuigou are orogenic granite formed after Early Devonian.
The authors investigated zircon U-Pb dating and petrological geochemical characteristics in the east of East Kunlun orogenic belt. The results show that the U-Pb age of zircons in tonalite is( 402 ± 2) Ma,belonging to Early Devonian of Variscan. The petrological geochemical characteristics show that the aluminium saturation A/CNK index ranges from 0. 946 to 1. 077,and the ratio of light rare earth elements and heavy rare earth elements( LREE/HREE) is from 2. 94 to 18. 93,which indicates the enrichment of light rare earth elements. And the δEu parameter is between 0. 01 and 0. 85,belonging to europium depletion type. The δCe parameter is between 0. 95 and 1. 23,reflecting normal-slightly enrichment. Overall,the rocks are mainly by I-type granite.Combined with the tectonic discrimination diagrams,the authors concluded that intermediate-acid intrusive rocks in Dashuigou are orogenic granite formed after Early Devonian.
引文
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[17]陆露,张延林,吴珍汉,等.东昆仑早古生代花岗岩锆石U-Pb年龄及其地质意义[J].地球学报,2013,34(4):447-454.
[18]吴福元,李献华,杨进辉,等.花岗岩成因研究的若干问题[J].岩石学报,2007,23(6):1217-1238.
[19]刘彬.东昆仑跃进山早泥盆世侵入杂岩体岩石学、锆石年代学及岩石成因[D].北京:中国地质大学(北京),2011:51-52.
[20]邱家骧.岩石化学[M].北京:地质出版社,1991:65-67.
[21]Chappell B W.Aluminium saturation in I-and S-type granites and the characterization of fractionated haplogranites[J].Lithos,1999,46(3):535-551.
[22]Chappell B W,White A J R.I and S-type granites in the Lachlan Fold Belt[J].Transactions of the Royal Society of Edinburgh:Earth Sciences,1992,83(1/2):1-26.
[23]Chappell B W,White A J R.Two constrasting granite types[J].Pacific Geology,1974,8:173-174.
[24]Chappell B W,White A J R.Two contrasting granite types:25years later[J].Australian Journal of Earth Sciences,2001,48(4):489-499.
[25]张旗,潘国强,李承东,等.花岗岩构造环境问题——关于花岗岩研究的思考之三[J].岩石学报,2007,23(11):2683-2698.
[26]Pearce J A,Harris N B W,Tindle A G.Trace elementdiscrimination diagrams for the tectonic interpretation of granitic rocks.Journal of Petrology,1984,25(4):956-983.
[27]Pearce J A.Sources and settings of granitic rocks[J].Episodes,1996,19(4):120-125.
[28]Harris N B W,Pearce J A,Tindel A G.Geochemical characteristics of collision-zone magmatism[J].Geological Society,London,Special Publications,1986,19(1):67-81.
[29]陆松年.青藏高原北部前寒武纪地质初探[M].北京:地质出版社,2002:1-125.
[2]李金超,杜玮,成永生,等.青海省东昆仑成矿带主要金矿床特征及关键控矿因素分析[J].地质与勘探,2015,51(6):1079-1088.
[3]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∶1500 000)[M].北京:地质出版社,2013:11-153.
[4]丰成友,张德全,王富春,等.青海东昆仑复合造山过程及典型造山型金矿地质[J].地球学报,2004,25(4):415-422.
[5]古凤宝.东昆仑地质特征及晚古生代—中生代构造演化[J].青海地质,1994(1):4-14.
[6]四川省地质矿产勘查开发局川西北地质队.青海省格尔木市大水沟地区J46E024022等4幅1∶5万区域地质调查成果报告[R].四川:四川省地质矿产勘查开发局川西北地质队,2014.
[7]Liu Y S,Gao S,Hu Z C,et al.Continental and oceanic crust recycling-induced melt-peridotite interactions in the Trans-North China Orogen:U-Pb dating,Hf isotopes and trace elements in zircons from mantle xenoliths[J].Journal of Petrology,2009,51(1/2):537-571,doi:10.1093/petrology/egp082.
[8]侯可军,李延河,田有荣.LA-MC-ICP-MS锆石微区原位UPb定年技术[J].矿床地质,2009,28(4):481-492.
[9]O’Connor J T.A classification for quartz rich igneous rocks based on feldspar ratios[J].U S Geol Surv Prof,1965,525:79-84.
[10]Sun S S,Mac Donough W F.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes[J].Geological Society,London,Special Publications,1989,42(1):313-345.
[11]青海省地矿局第一区调队.格尔木东农场幅、东温泉幅1∶20万区域地质联测报告[R].青海:青海省地矿局第一区调队,1981.
[12]祁生胜.青海省东昆仑造山带火成岩岩石构造组合与构造演化[D].北京:中国地质大学(北京),2015.
[13]赵振明,马华东,王秉璋,等.东昆仑早泥盆世碰撞造山的侵入岩证据[J].地质论评,2008,54(1):47-56.
[14]肖庆辉,王涛,邓晋福,等.中国典型造山带花岗岩与大陆地壳生长研究[M].北京:地质出版社,2009:1-528.
[15]王秉璋.祁漫塔格地质走廊域古生代—中生代火成岩岩石构造组合研究[D].北京:中国地质大学(北京),2011.
[16]刘彬,马昌前,张金阳,等.东昆仑造山带东段早泥盆世侵入岩的成因及其对早古生代造山作用的指示[J].岩石学报,2012,28(6):1785-1807.
[17]陆露,张延林,吴珍汉,等.东昆仑早古生代花岗岩锆石U-Pb年龄及其地质意义[J].地球学报,2013,34(4):447-454.
[18]吴福元,李献华,杨进辉,等.花岗岩成因研究的若干问题[J].岩石学报,2007,23(6):1217-1238.
[19]刘彬.东昆仑跃进山早泥盆世侵入杂岩体岩石学、锆石年代学及岩石成因[D].北京:中国地质大学(北京),2011:51-52.
[20]邱家骧.岩石化学[M].北京:地质出版社,1991:65-67.
[21]Chappell B W.Aluminium saturation in I-and S-type granites and the characterization of fractionated haplogranites[J].Lithos,1999,46(3):535-551.
[22]Chappell B W,White A J R.I and S-type granites in the Lachlan Fold Belt[J].Transactions of the Royal Society of Edinburgh:Earth Sciences,1992,83(1/2):1-26.
[23]Chappell B W,White A J R.Two constrasting granite types[J].Pacific Geology,1974,8:173-174.
[24]Chappell B W,White A J R.Two contrasting granite types:25years later[J].Australian Journal of Earth Sciences,2001,48(4):489-499.
[25]张旗,潘国强,李承东,等.花岗岩构造环境问题——关于花岗岩研究的思考之三[J].岩石学报,2007,23(11):2683-2698.
[26]Pearce J A,Harris N B W,Tindle A G.Trace elementdiscrimination diagrams for the tectonic interpretation of granitic rocks.Journal of Petrology,1984,25(4):956-983.
[27]Pearce J A.Sources and settings of granitic rocks[J].Episodes,1996,19(4):120-125.
[28]Harris N B W,Pearce J A,Tindel A G.Geochemical characteristics of collision-zone magmatism[J].Geological Society,London,Special Publications,1986,19(1):67-81.
[29]陆松年.青藏高原北部前寒武纪地质初探[M].北京:地质出版社,2002:1-125.
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