大兴安岭北段上侏罗统哈日陶勒盖玄武岩的厘定及其地质意义
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摘要
大兴安岭北段西部新巴尔虎右旗地区新厘定出非正式填图单元——上侏罗统哈日陶勒盖玄武岩,其岩石组合为灰黑色、深绿灰色、紫褐色玄武岩以及气孔杏仁状玄武岩、碱性橄榄玄武岩、玄武粗安岩等。锆石SHRIMP U-Pb定年法测得其年龄数据为(146.7±3.1)Ma,时代为晚侏罗世。岩石地球化学分析显示,哈日陶勒盖玄武岩属高钾钙碱性系列,岩石中Sr含量低,富集大离子亲石元素Rb、K、Ba,亏损高场强元素Nb、Ti,稀土元素含量总体较高,轻重稀土分馏明显,略具有铕负异常。上侏罗统哈日陶勒盖玄武岩的厘定说明,大兴安岭地区存在晚侏罗世基性火山岩浆活动事件。通过区域地质调查和地层对比,上侏罗统哈日陶勒盖玄武岩与上侏罗统伊列克得组原始定义相符,二者实则为同物异名,建议恢复上侏罗统伊列克得组。这一认识对大兴安岭中生代构造岩浆活动的研究及中生代火山岩地层划分对比具有重要地质意义。
The Upper Jurassic basaltic rocks of the Haritaolegai Formation were firstly identified in the western part of the northern Da Hinggan Mountains,with the rock assemblage including black/dark gray/purplish brown basalt,amygdaloid basalt,alkaline olivine basalt and basaltic trachy and esite. SHRIMP zircon U-Pb dating of the basalt yielded Late Jurassic age of( 146. 7 ± 3. 1) Ma. Lithogeochemical data show that the rocks are highK calc-alkaline. The basalts contain low content of Sr,and show enrichments in high large ion lithophile elements( LILEs,such as Rb,K and Ba) and depletions in high field strength elements( HFSEs,such as Nb and Ti). The rare-earth element( REE) contents are generally high,yet the REE fractionation is unclear and the rocks contain slightly negative Eu anomalies. Based on the regional geological survey and strata contrast,theUpper Jurassic Haritaolegai Formation basalt is confirmed to fit the definition of the ever used Yiliekede Formation,so they are the same petrographic composition. Therefore,this study suggests that the Yiliekede Formation should be resumed,and the confirmation of this formation is of great geological significance for the study of tectonic-magmatic activities in the Mesozoic and the comparison of Mesozoic volcanic strata in the study area.
The Upper Jurassic basaltic rocks of the Haritaolegai Formation were firstly identified in the western part of the northern Da Hinggan Mountains,with the rock assemblage including black/dark gray/purplish brown basalt,amygdaloid basalt,alkaline olivine basalt and basaltic trachy and esite. SHRIMP zircon U-Pb dating of the basalt yielded Late Jurassic age of( 146. 7 ± 3. 1) Ma. Lithogeochemical data show that the rocks are highK calc-alkaline. The basalts contain low content of Sr,and show enrichments in high large ion lithophile elements( LILEs,such as Rb,K and Ba) and depletions in high field strength elements( HFSEs,such as Nb and Ti). The rare-earth element( REE) contents are generally high,yet the REE fractionation is unclear and the rocks contain slightly negative Eu anomalies. Based on the regional geological survey and strata contrast,theUpper Jurassic Haritaolegai Formation basalt is confirmed to fit the definition of the ever used Yiliekede Formation,so they are the same petrographic composition. Therefore,this study suggests that the Yiliekede Formation should be resumed,and the confirmation of this formation is of great geological significance for the study of tectonic-magmatic activities in the Mesozoic and the comparison of Mesozoic volcanic strata in the study area.
引文
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[31]赵胜金,于海洋,周颖帅,等.大兴安岭北段下侏罗统柴河组的厘定及地质意义[J].地质通报,2018,37(7):1-6.
[32]内蒙古自治区第二区域地质调查队二分队.阿尔哈沙特幅(M-50-32),新巴尔虎右旗幅(M-50-33),巴彦塔拉幅(M-50-34),沙鲁敖包幅(L-50-2),阿拉格幅(L-50-3),贝尔湖幅(L-50-4)1∶20万区域地质调查报告[R].呼和浩特:内蒙古自治区地质调查院,1987.
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[2]佘宏全,李红红,李进文,等.内蒙古大兴安岭中北段铜铅锌金银多金属矿床成矿规律与找矿方向[J].地质学报,2009,83(10):1456-1472.
[3]李锦轶,张进,杨天南,等.北亚造山区南部及其毗邻地区地壳构造分区与构造演化[J].吉林大学学报(地球科学版),2009,39(4):584-605.
[4]刘永江,张兴洲,金巍,等.东北地区晚古生代区域构造演化[J].中国地质,2010,37(4):943-951.
[5]唐杰,许文良,王枫,等.张广才岭帽儿山组双峰式火山岩成因:年代学与地球化学证据[J].世界地质,2011,30(4):508-513.
[6]许文良,王枫,裴福萍,等.中国东北中生代构造体制与区域成矿背景:来自中生代火山岩组合时空变化的制约[J].岩石学报,2013,29(2):339-353.
[7]李研,王建,孙德有,等.内蒙古海拉尔北部八大关地区花岗岩的成岩时代、地球化学特征与成因[J].现代地质,2017,31(2):234-245.
[8]MI K F,LIU Z J,LIU R B,et al.U-Pb zircon,geochemical and Sr-Nd-Hf isotopic constraints on age and origin of the intrusions from Wunugetushan porphyry deposit,Northeast China:implication for Triassic-Jurassic Cu-Mo mineralization in Mongolia-Erguna metallogenic belt[J].International Geology Review,2018,60(4):496-512.
[9]赵胜金,于海洋,周颖帅,等.内蒙古1∶5万乌音呼日勒庙等四幅区域地质矿产调查新进展[J].中国地质调查,2018,5(3):49-55.
[10]郑吉林,王文东,杨华本,等.大兴安岭北部下侏罗统战备村组的建立及其地质意义[J].地质通报,2016,35(7):1106-1114.
[11]赵胜金,高利东,武中华,等.综合地物化技术在额仁陶勒盖矿集区地质找矿中的应用——布日罕特银多金属矿点的发现及意义[J].地质与勘探,2018,54(1):121-129.
[12]陈毓川,王登红,徐志刚,等.中国重要矿产和区域成矿规律[M].北京:地质出版社,2013:1-20.
[13]宋彪.用SHRIMP测定锆石U-Th-Pb同位素工作方法[J].地质通报,2015,34(10):1-12.
[14]迟清华,鄢明才.应用地球化学元素丰度数据手册[M].北京:地质出版社.2007:1-20.
[15]BOYNTON W V.Cosmochemistry of the rare earth elements:meteoric studies[J].Rare Earth Element Geochemistry,1984(2):63-114.
[16]李昌年.火成岩微量元素岩石学[M].武汉:中国地质大学出版社,1992:1-10.
[17]黑龙江省区域地层表编写组.东北地区区域地层表(黑龙江省分册)[M].北京:地质出版社,1979:1-10.
[18]李文国,姜万德,王惠,等.内蒙古自治区岩石地层[M].武汉:中国地质大学出版社,1996:1-20.
[19]葛文春,李献华,林强,等.呼伦湖早白垩世碱性流纹岩的地球化学特征及其意义[J].地质科学,2001,36(2):176-183.
[20]林强,葛文春,曹林,等.大兴安岭中生代双峰式火山岩的地球化学特征[J].地球化学,2003,(3):208-222.
[21]尹志刚,赵海滨,赵寒冬,等.大兴安岭北端塔木兰沟组玄武质岩石的地球化学特征及构造背景[J].地质通报,2005,24(9):848-853.
[22]尹志刚,张跃龙,杨晓平,等.大兴安岭北部中生代火山岩特征及岩浆演化[J].世界地质,2006,25(2):120-128.
[23]李英雷,徐国,刘汇川,等.大兴安岭西缘玛尼吐组火山岩成因及构造指示[J].现代地质,2017,31(4):683-696.
[24]陈志广,张连昌,周新华,等.满洲里新右旗火山岩剖面年代学和地球化学特征[J].岩石学报,2006,22(12):2971-2986.
[25]ZHANG J H,GE W C,WU F Y,et al.Large-scale Early Cretaceous volcanic events in the northern Great Xing'an Range,Northeastern China[J].Lithos,2008,102(1/2):138-157.
[26]孟恩,许文良,杨德彬,等.满洲里地区灵泉盆地中生代火山岩的锆石U-Pb年代学、地球化学及其地质意义[J].岩石学报,2011,27(4):1209-1226.
[27]孙德有,苟军,任云生,等.满洲里南部玛尼吐组火山岩锆石U-Pb年龄与地球化学研究[J].岩石学报,2011,27(10):3083-3094.
[28]佘宏全,李进文,向安平,等.大兴安岭中北段原岩锆石UPb测年及其与区域构造演化关系[J].岩石学报,2012,28(2):571-594.
[29]XU W L,PEI F P,WANG F,et al.Spatial-temporal relationships of Mesozoic volcanic rocks in NE China:Constraints on tectonic overprinting and transformations between multiple tectonic regimes[J].Journal of Asian Earth Sciences,2013,74:167-193.
[30]冯洋洋,孙景贵,祝浚泉,等.大兴安岭西坡额仁陶勒盖银多金属矿区火山岩岩石成因及其地质意义:年代学、地球化学特征[J].世界地质,2017,36(1):118-134.
[31]赵胜金,于海洋,周颖帅,等.大兴安岭北段下侏罗统柴河组的厘定及地质意义[J].地质通报,2018,37(7):1-6.
[32]内蒙古自治区第二区域地质调查队二分队.阿尔哈沙特幅(M-50-32),新巴尔虎右旗幅(M-50-33),巴彦塔拉幅(M-50-34),沙鲁敖包幅(L-50-2),阿拉格幅(L-50-3),贝尔湖幅(L-50-4)1∶20万区域地质调查报告[R].呼和浩特:内蒙古自治区地质调查院,1987.
[33]葛文春,林强,李献华,等.大兴安岭北部伊列克得组玄武岩的地球化学特征[J].矿物岩石,2000,20(3):14-18.