西准噶尔阿克布拉克地区晚泥盆世朱鲁木特组火山岩地球化学、锆石U-Pb年代学特征及地质意义
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摘要
新疆西准噶尔地区发育较丰富的古生代火山岩序列,对该地区古生代时期的构造演化有重要意义。朱鲁木特组火山岩主要为一套基性-酸性火山岩,岩石组合为安山岩-玄武岩-蚀变安山质英安斑岩,在火山沉积岩夹层中,古生物化石鉴定成果及LA-ICP-MS锆石原位U-Pb测年结果表明,LA-ICP-MS锆石年龄为(363.0±5.0) Ma,时代为晚泥盆世。岩石地球化学特征表明,该组火山岩具富铝、贫镁的特征,属钙碱性系列岩石,富集轻稀土和大离子亲石元素(Rb,Ba),亏损高场强元素(Nb,Ta)。具典型岛弧火山岩地球化学特征。
Abstact:Paleozoic volcanic rocks developed in the Western Junggar are critical for the understanding of regional evolution history during this period. Paleofossil identification and LA-ICP-MS zircon in-situ U-Pb dating show that the volcanic rocks of Zhulumute Formation were formed at ac. 363 Ma.Volcanic rocks in Zhulumute group are rich in Al_2O_3 contents but depleted MgO contents,resembling this calcalkaline-subakaline volcanic series.In addition,Zhulumute rocks show enriched LREE,large-ion lithophile element \(LILE),but depleted Nb,Ta,Ti,high field strength elements(HSFE),typical of those volcanic rocks in continental arcs.
Abstact:Paleozoic volcanic rocks developed in the Western Junggar are critical for the understanding of regional evolution history during this period. Paleofossil identification and LA-ICP-MS zircon in-situ U-Pb dating show that the volcanic rocks of Zhulumute Formation were formed at ac. 363 Ma.Volcanic rocks in Zhulumute group are rich in Al_2O_3 contents but depleted MgO contents,resembling this calcalkaline-subakaline volcanic series.In addition,Zhulumute rocks show enriched LREE,large-ion lithophile element \(LILE),but depleted Nb,Ta,Ti,high field strength elements(HSFE),typical of those volcanic rocks in continental arcs.
引文
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[6]丁天府.新疆火山岩分区及其地质意义[J].新疆地质,1998,16(1):39-48.
[7]夏林圻,夏祖春,徐学义,等.利用地球化学方法判别大陆玄武岩和岛弧玄武岩[J].岩石矿物学杂志,2007,26(1):77-89.
[8]古丽加孜·塔里哈提,帕拉提·阿布都卡迪尔,木合塔尔·买买提,等.西准噶尔谢米斯台泥盆系火山岩地球化学特征及其构造意义[J].西部探矿工程,2017,29(2):129-131+135.
[9]尹继元,陈文,袁超,等.西准噶尔谢米斯台山东段早石炭世玄武安山岩的成因及意义[J].大地构造与成矿学,2015,39(5):876-888.
[10]孙勇,李永军,杨高学,等.西准噶尔谢米斯台山西缘火山岩岩石地球化学特征及其地质意义[J].矿物岩石地球化学通报,2015,34(2):387-394.
[11]黄汲清,任纪舜,姜春发,等.中国大地构造及其演化[J].科学出版社.
[12]朱宝清、冯益民.新疆西准噶尔板块构造及演化[J].新疆地质,1994,36(1):38-43.
[13]成守德,王元龙.新疆大地构造演化基本特征[J].新疆地质,1998.,16(2):97-107.
[14]徐新,周可法,王煜.西准噶尔晚古生代残余洋盆消亡时间与构造背景研究[J].岩石学报,2010,26(11):3206-3214.
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