新疆巴音布鲁克地区奥陶纪侵入岩地球化学特征及其构造意义
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摘要
巴音布鲁克地区位于中天山地块中天山多期复合陆缘岩浆弧。通过研究发现,该地区奥陶纪侵入岩岩性主要为石英闪长岩、花岗闪长岩、二长花岗岩。通过锆石U-Pb定年识别出中奥陶世(462. 7±6. 2) Ma、(463. 4±2. 8) Ma、(471. 5±5. 9) Ma侵入体,岩石地球化学结果表明岩体具有准铝质钙碱性系列岩石特征。稀土元素配分型式呈明显的右倾模式,具负Eu异常,微量元素显示出大离子亲石元素富集、高场强元素亏损的配分模式。地球化学特征指示侵入体形成于俯冲碰撞环境,其岩浆来源为壳幔混源岩浆。综合分析认为,南天山洋盆初始向北发生俯冲作用的时间为中奥陶世早期,与俯冲过程中的右旋运动有关,岩浆活动在中天山地区显示出由西部逐步向东部扩展演化的规律。
The Bayinbuluk area is located in the multi-stage composite continental arc in the Middle Tianshan Complex. Our study found that the Ordovician intrusions include mainly quartz diorite,granodiorite and monzogranite. Zircon U-Pb dating yielded Middle Ordovician ages( 462. 7 ± 6. 2 Ma,463. 4 ± 2. 8 Ma,471. 5± 5. 9 Ma) intrusions,and geochemical analysis shows metaluminous and calc-alkaline affinities. Chondritenormalized REE patterns show clear right-inclining pattern and negative Eu anomalies. Trace element analysis results show large ion lithophile element( LILE) enrichments and high field strength element( HFSE) depletions. Geochemical characteristics indicate that the intrusions were formed in a subduction-collisional setting,and the magma may have been derived from a crust-mantle mixed source. Comprehensive analysis suggests that the South Tianshan ocean basin started to subduct northward in the early Middle Ordovician,which may have been related to the regional dextral movement. Magmatism in the Middle Tianshan shows a gradual eastward migration and expansion.
The Bayinbuluk area is located in the multi-stage composite continental arc in the Middle Tianshan Complex. Our study found that the Ordovician intrusions include mainly quartz diorite,granodiorite and monzogranite. Zircon U-Pb dating yielded Middle Ordovician ages( 462. 7 ± 6. 2 Ma,463. 4 ± 2. 8 Ma,471. 5± 5. 9 Ma) intrusions,and geochemical analysis shows metaluminous and calc-alkaline affinities. Chondritenormalized REE patterns show clear right-inclining pattern and negative Eu anomalies. Trace element analysis results show large ion lithophile element( LILE) enrichments and high field strength element( HFSE) depletions. Geochemical characteristics indicate that the intrusions were formed in a subduction-collisional setting,and the magma may have been derived from a crust-mantle mixed source. Comprehensive analysis suggests that the South Tianshan ocean basin started to subduct northward in the early Middle Ordovician,which may have been related to the regional dextral movement. Magmatism in the Middle Tianshan shows a gradual eastward migration and expansion.
引文
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[2]高俊,龙灵利,钱青,等.南天山:晚古生代还是三叠纪碰撞造山带[J].岩石学报,2006,22(5):1049-1061.
[3]朱志新,李锦轶,董连慧,等.新疆南天山构造格架及构造演化[J].地质通报,2009,28(12):1863-1870.
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[10]韩宝福,季建清,宋彪,等.新疆东准噶尔晚古生代陆壳垂向生长(1):后碰撞深成岩浆活动的时限[J].岩石学报,2006,22(5):1077-1086.
[11]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.
[12]卜国民,李华启,李文铅,等.新疆塔克札勒蛇绿混杂岩中玄武质熔岩地球化学特征及因讨论[J].大地构造与成矿学,2005,29(2):252-261.
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[17]左国朝,刘义科,张招崇,等.中亚地区中、南天山造山带构造演化及成矿背景分析[J].现代地质,2011,25(1):1-14.
[18]龙灵利,高俊,熊贤明,等.新疆中天山南缘比开(地区)花岗岩地球化学特征及年代学研究[J].岩石学报,2007,23(4):719-732.
[19]张喜,高俊,董连慧,等.新疆中天山乔霍特铜矿区Ⅰ型花岗岩锆石LA-ICP-MS U-Pb年龄及其地质意义[J].岩石学报,2011,27(6):1637-1648.
[20]朱永峰.西南天山科桑溶洞新元古代-早奥陶世花岗岩锆石U-Pb年代学研究[J].岩石学报,2012,28(7):2113-2120.
[21]李江涛,何学锋,刘亮,等.新疆东天山哈尔里克奥陶纪的构造属性:来自火山岩LA-ICP-MS锆石U-Pb年代学与地球化学的制约[J].现代地质,2017,31(3):460-473.
[22]李平,朱志新,穆利修,等.新疆中天山巴伦台地区花岗质侵入体地球化学、年代学研究及其构造意义[J].地质学报,2017,91(1):80-93.
[23]朱志新,王克卓,郑玉洁,等.新疆伊犁地块南缘志留纪和泥盆纪花岗质侵入体锆石SHRIMP定年及其形成时构造背景的初步探讨[J].岩石学报,2006,22(5):1193-1200.
[24]董云鹏,周鼎武,张国伟,等.中天山南缘乌瓦门蛇绿岩形成构造环境[J].岩石学报,2005,21(1):39-46.
[25]马中平,夏林圻,徐学义,等.南天山北部志留系巴音布鲁克组火山-侵入杂岩的形成环境及构造意义[J].吉林大学学报(地球科学版),2006(5):736-743.
[26]郭瑞清,尼加提·阿布都逊,秦切,等.新疆塔里木北缘志留纪花岗岩类侵入岩的地质特征及构造意义[J].地质通报,2013,32(2/3):220-238.
[27]张斌,陈文,喻顺,等.南天山洋古生代期间俯冲作用过程探讨[J].岩石学报,2014,30(8):2351-2362.
[28]刘振涛,董新丰,薛春纪.中天山巴音布鲁克组火山岩地质地球化学特征及LA-ICP-MS锆石年龄[J].新疆地质,2015,33(3):329-334.
[29]陈义兵,张国伟,柳小明,等.中天山巴仑台地区变形花岗岩类LA-ICP-MS U-Pb年代学及其构造意义[J].地质论评,2012,58(1):117-125.
[30]WINDLEY B F,ALLEN M B,ZHANG C,et al. Paleozoic accretion and Cenozoic redeformation of the Chinese Tien Shan range,Central Asia[J]. Geology,1990,18:128-131.
[31]ALLEN M B,WINDLY B F,ZHANG C. Paleozoic collisional tectonics and magmatism of the Chinese Tien Shan,central Asia[J]. Tectonophysics,1992,220:89-115.
[32]GAO J,KLEMD R. Formation of HP-LT rocks and their tectonic implications in the western Tianshan Orogen,NW China:geochemical and age constraints[J]. Lithos,2003,66:1-22.
[33]SU W,GAO J,KLEMD R,et al. U-Pb zircon geochronology of the Tianshan eclogites in NW China:implication for the collision between the Yili and Tarim blocks of the southwestern Altaids[J]. European Journal of Mineralogy,2010,22:473-478.
[34]邢浩,赵晓波,张招崇,等.西天山巴音布鲁克地区早古生代成矿地质环境:岩浆岩及其时代和元素同位素约束[J].岩石学报,2016,32(6):1770-1794.
[35]胡霭琴,张国新,张前锋,等.天山造山带基底时代和地壳增生的Nd同位素制约[J].中国科学D辑,1999,29(2):104-112.
[36]董连慧,朱志新,屈迅,等.新疆蛇绿岩带的分布、特征及研究新进展[J].岩石学报,2010,26(10):2894-2904.
[37]LUDWIG K R. Isoplot/Ex Version 3. 0. A Geochronological Toolkit for Microsoft Excel[M]. Berkeley:Berkeley Geochronlogical Center,2003:1-70.
[38]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.
[39]高永宝,李文渊,李侃,等.东昆仑祁漫塔格白干湖—戛勒赛矿带成岩成矿时代及钨锡成矿作用[J].西北地质,2012,45(4):229-241.
[40]WILSON M. Igneous Petrogenesis[M]. London:Allen and Unwin,1989.
[41]MANIAR P D,PICCOLI P M. Tectonic discrimination of granitoids[J]. Geological Society of America Bulletin,1989,101:635-643.
[42]TAYLOR S R,MCLENNAN S M. The Continental Crust:Its Composition and Evolution[M]. Oxford:Blackwell Scientific Publications,1985:312.
[43]SUN S S,MCODONOUGH W F. Chemical and Isotopic Systematics of Oceanic Basalts:Implications for Mantle Composition and Processes[M]. London:Geological Society of London,1989:313-345.
[44]PUPIN J P. Zircon and granite petrology[J]. Contribution to Mineralogy and Petrology,1980,73(3):207-220.
[45]VAVRA G. On the kinematics of zircon growth and its petrogenetic significance:a cathodoluminescence study[J]. Contribution to Mineralogy and Petrology,1990,106:90-99.
(1)新疆维吾尔自治区地质调查院.新疆巴伦台1∶5万K45E006010、K45E007010、K45E007011、K45E008010、K45E008011五幅区域地质调查. 2016.
[2]高俊,龙灵利,钱青,等.南天山:晚古生代还是三叠纪碰撞造山带[J].岩石学报,2006,22(5):1049-1061.
[3]朱志新,李锦轶,董连慧,等.新疆南天山构造格架及构造演化[J].地质通报,2009,28(12):1863-1870.
[4]肖序常,汤耀庆,冯益民,等.新疆北部及其邻区大地构造[M].北京:地质出版社,1992:1-169.
[5]JAHN B M,WINDLEY B F,NATAL'IN B,et al. Phanerozoic continental growth in Central Asia[J]. Journal of Asian Earth Sciences,2004,23(5):599-603.
[6]田慧新,刘显凡,徐德章,等.东准噶尔(西域)含锡花岗岩特征及黑云母对含矿性的判别作用[J].新疆地质科学,1990(2):56-71.
[7]马瑞士,舒良树,孙家齐.东天山构造演化与成矿[M].北京:地质出版社,1997:72-74.
[8]李锦轶,肖序常.对新疆地壳结构与构造演化几个问题的简要评述[J].地质科学,1999,34(4):405-419.
[9]WANG Z H,SUN S,LI J L,et al. Paleozoic tectonic evolution of the northern Xinjiang,China:Geochemical and geochronological constrains from the ophiolites[J]. Tectonics,2003,22(2):1014-1029.
[10]韩宝福,季建清,宋彪,等.新疆东准噶尔晚古生代陆壳垂向生长(1):后碰撞深成岩浆活动的时限[J].岩石学报,2006,22(5):1077-1086.
[11]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.
[12]卜国民,李华启,李文铅,等.新疆塔克札勒蛇绿混杂岩中玄武质熔岩地球化学特征及因讨论[J].大地构造与成矿学,2005,29(2):252-261.
[13]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.
[14]唐红峰,苏玉平,刘丛强,等.新疆北部卡拉麦里斜长花岗岩的锆石U-Pb年龄及其构造意义[J].大地构造与成矿学,2007,31(1):110-117.
[15]刘希军,许继峰,侯青叶,等.新疆东准噶尔克拉麦里蛇绿岩地球化学:洋脊俯冲的产物[J].岩石学报,2007,23(7):1591-1602.
[16]WINDLEY B F,ALEXEIEV D,XIAO W J,et al. Tectonic models for accretion of the Central Asian Orogenic Belt[J]. Journal of the Geological Society,2007,164(1):31-47.
[17]左国朝,刘义科,张招崇,等.中亚地区中、南天山造山带构造演化及成矿背景分析[J].现代地质,2011,25(1):1-14.
[18]龙灵利,高俊,熊贤明,等.新疆中天山南缘比开(地区)花岗岩地球化学特征及年代学研究[J].岩石学报,2007,23(4):719-732.
[19]张喜,高俊,董连慧,等.新疆中天山乔霍特铜矿区Ⅰ型花岗岩锆石LA-ICP-MS U-Pb年龄及其地质意义[J].岩石学报,2011,27(6):1637-1648.
[20]朱永峰.西南天山科桑溶洞新元古代-早奥陶世花岗岩锆石U-Pb年代学研究[J].岩石学报,2012,28(7):2113-2120.
[21]李江涛,何学锋,刘亮,等.新疆东天山哈尔里克奥陶纪的构造属性:来自火山岩LA-ICP-MS锆石U-Pb年代学与地球化学的制约[J].现代地质,2017,31(3):460-473.
[22]李平,朱志新,穆利修,等.新疆中天山巴伦台地区花岗质侵入体地球化学、年代学研究及其构造意义[J].地质学报,2017,91(1):80-93.
[23]朱志新,王克卓,郑玉洁,等.新疆伊犁地块南缘志留纪和泥盆纪花岗质侵入体锆石SHRIMP定年及其形成时构造背景的初步探讨[J].岩石学报,2006,22(5):1193-1200.
[24]董云鹏,周鼎武,张国伟,等.中天山南缘乌瓦门蛇绿岩形成构造环境[J].岩石学报,2005,21(1):39-46.
[25]马中平,夏林圻,徐学义,等.南天山北部志留系巴音布鲁克组火山-侵入杂岩的形成环境及构造意义[J].吉林大学学报(地球科学版),2006(5):736-743.
[26]郭瑞清,尼加提·阿布都逊,秦切,等.新疆塔里木北缘志留纪花岗岩类侵入岩的地质特征及构造意义[J].地质通报,2013,32(2/3):220-238.
[27]张斌,陈文,喻顺,等.南天山洋古生代期间俯冲作用过程探讨[J].岩石学报,2014,30(8):2351-2362.
[28]刘振涛,董新丰,薛春纪.中天山巴音布鲁克组火山岩地质地球化学特征及LA-ICP-MS锆石年龄[J].新疆地质,2015,33(3):329-334.
[29]陈义兵,张国伟,柳小明,等.中天山巴仑台地区变形花岗岩类LA-ICP-MS U-Pb年代学及其构造意义[J].地质论评,2012,58(1):117-125.
[30]WINDLEY B F,ALLEN M B,ZHANG C,et al. Paleozoic accretion and Cenozoic redeformation of the Chinese Tien Shan range,Central Asia[J]. Geology,1990,18:128-131.
[31]ALLEN M B,WINDLY B F,ZHANG C. Paleozoic collisional tectonics and magmatism of the Chinese Tien Shan,central Asia[J]. Tectonophysics,1992,220:89-115.
[32]GAO J,KLEMD R. Formation of HP-LT rocks and their tectonic implications in the western Tianshan Orogen,NW China:geochemical and age constraints[J]. Lithos,2003,66:1-22.
[33]SU W,GAO J,KLEMD R,et al. U-Pb zircon geochronology of the Tianshan eclogites in NW China:implication for the collision between the Yili and Tarim blocks of the southwestern Altaids[J]. European Journal of Mineralogy,2010,22:473-478.
[34]邢浩,赵晓波,张招崇,等.西天山巴音布鲁克地区早古生代成矿地质环境:岩浆岩及其时代和元素同位素约束[J].岩石学报,2016,32(6):1770-1794.
[35]胡霭琴,张国新,张前锋,等.天山造山带基底时代和地壳增生的Nd同位素制约[J].中国科学D辑,1999,29(2):104-112.
[36]董连慧,朱志新,屈迅,等.新疆蛇绿岩带的分布、特征及研究新进展[J].岩石学报,2010,26(10):2894-2904.
[37]LUDWIG K R. Isoplot/Ex Version 3. 0. A Geochronological Toolkit for Microsoft Excel[M]. Berkeley:Berkeley Geochronlogical Center,2003:1-70.
[38]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.
[39]高永宝,李文渊,李侃,等.东昆仑祁漫塔格白干湖—戛勒赛矿带成岩成矿时代及钨锡成矿作用[J].西北地质,2012,45(4):229-241.
[40]WILSON M. Igneous Petrogenesis[M]. London:Allen and Unwin,1989.
[41]MANIAR P D,PICCOLI P M. Tectonic discrimination of granitoids[J]. Geological Society of America Bulletin,1989,101:635-643.
[42]TAYLOR S R,MCLENNAN S M. The Continental Crust:Its Composition and Evolution[M]. Oxford:Blackwell Scientific Publications,1985:312.
[43]SUN S S,MCODONOUGH W F. Chemical and Isotopic Systematics of Oceanic Basalts:Implications for Mantle Composition and Processes[M]. London:Geological Society of London,1989:313-345.
[44]PUPIN J P. Zircon and granite petrology[J]. Contribution to Mineralogy and Petrology,1980,73(3):207-220.
[45]VAVRA G. On the kinematics of zircon growth and its petrogenetic significance:a cathodoluminescence study[J]. Contribution to Mineralogy and Petrology,1990,106:90-99.
(1)新疆维吾尔自治区地质调查院.新疆巴伦台1∶5万K45E006010、K45E007010、K45E007011、K45E008010、K45E008011五幅区域地质调查. 2016.