内蒙古德莫哈达盆地白音高老组地层层序及时代研究新进展
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摘要
德莫哈达火山喷发盆地是大兴安岭南段晚中生代重要的火山喷发盆地之一,通过系统剖面研究及路线调查认为,德莫哈达火山喷发盆地由白音高老组火山岩组成,划分为3个岩性段,在白音高老组顶部划分出偏碱性火山岩段,构成一个完整的沉积-喷发旋回。盆地火山岩相有8种类型,圈定了9个Ⅴ级火山机构,受北北东向断裂控制明显。根据锆石U-Pb同位素测年,盆地火山活动时期为128~125Ma,为早白垩世。
The Demohada volcanic-eruption basin is one of the most important Late Mesozoic volcanic basins in southern Da Hinggan Mountains. It is considered that the Demohada volcanic-eruption basin is composed of volcanic rocks of Baiyin'gaolao Formation, which is divided into three lithologic segments and constitutes a total sedimentary and eruption cycle. The volcanic rocks have eight types with nine V-grade volcanic apparatuses, obviously controlled by NNE-trending faults. The results of zircon U-Pb dating show that the volcanic activity of the basin occurred mostly from 128 Ma to 125 Ma, suggesting Early Cretaceous.
The Demohada volcanic-eruption basin is one of the most important Late Mesozoic volcanic basins in southern Da Hinggan Mountains. It is considered that the Demohada volcanic-eruption basin is composed of volcanic rocks of Baiyin'gaolao Formation, which is divided into three lithologic segments and constitutes a total sedimentary and eruption cycle. The volcanic rocks have eight types with nine V-grade volcanic apparatuses, obviously controlled by NNE-trending faults. The results of zircon U-Pb dating show that the volcanic activity of the basin occurred mostly from 128 Ma to 125 Ma, suggesting Early Cretaceous.
引文
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[17]张学斌,周长红,来林,等.锡林浩特东部早白垩世白音高老组岩石地球化学特征、LA-MC-ICP-MS锆石U-Pb年龄及地质意义[J].地质与勘探,2015,51(2):290-301.
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[19]黄明达,崔晓庄,裴圣良,等.兴安地块白音高老组流纹岩锆石U-Pb年龄及其构造意义[J].中国煤炭地质,2016,28(11):30-37.
[20]Ludwig K R.User’s manual for Isoplot/Ex,version 3.00.A geochronological toolkit for microsoft Excel[M].Berkeley Geochronology Center Special Publication No.4,2003.
(1)内蒙古区调队.1∶20万贺斯格乌拉牧场幅区域地质调查报告.1978.
(2)内蒙古地质调查院.1∶25万宝格达山林场幅区调报告.2011.
(3)内蒙古地质调查院.1∶25万霍林郭勒市幅区调报告.2011.
[2]内蒙古自治区地质矿产局.内蒙古自治区岩石地层[M].武汉:中国地质大学出版社,1996.
[3]区域地质矿产地质司.火山岩区区域地质调查方法指南[M].北京:地质出版社,1987.
[4]卢清地.“火山构造-岩性岩相-火山地层”填图方法研究报告[M].福州:福建省地图出版社,2004.
[5]邵积东,王慧,安存杰,等.大兴安岭北部地区晚侏罗世-早白垩世地层划分有关问题的讨论[J].地层学杂志,2005,29(sup1):573-578.
[6]Zhang J H,Ge W C,Wu F Y,et al.Mesozoic bimodal volcanic in Zhalantun of the Da Hinggan Rang and its geological significance:zircon U-Pb age and Hf isotopicconstraints[J].Acta Geologica Sinica,2006,80(1):58-69.
[7]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.
[8]Meng E,Xu W L,Pei F P.Chronology of late Paleozoic volcanism in eastern and southeastern margin of Jiamusi massif and its tectonic implications[J].Chinese Sciences Bulletin,2008,53(8):1231-1245.
[9]Zhang J H,Gao S,Ge W C,et al.Geochronology of the Mesozoic volcanic rocks in the Great Xing’an range,Northeastern China:implications for subduction-induced delamination[J].Chemical Geology,2010,276(3/4):144-165.
[10]Ying J F,Zhou X H,Zhang L C,et al.Geochronological framwork of Mesozoic volcanic rocks in the Great Xing’an Range,NEChina,and their geodynamic implications[J].Journal of Asian Earth Sciences,2010,39(6):786-793.
[11]秦涛,郑常青,崔天日,等.内蒙古扎兰屯地区白音高老组火山岩地球化学、年代学及其地质意义[J].地质与资源,2014,23(2):146-153.
[12]苟军,孙德有,赵忠华,等.满洲里南部白音高老组的形成时代与岩石成因[J].岩石学报,2010,26(1):333-344.
[13]王建国,和钟铧,许文良.大兴安岭南部钠闪石流纹岩的岩石成因:年代学和地球化学证据[J].岩石学报,2013,29(3):853-863.
[14]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(18):167-193.
[15]张乐彤,李世超,赵庆英,等.大兴安岭中段白音高老组火山岩的形成时代及地球化学特征[J].世界地质,2015,34(1):44-54.
[16]聂立军,贾海明,王聪,等.大兴安岭中段白音高老组流纹岩年代学地球化学及其地质意义[J].世界地质,2015,34(2):296-304.
[17]张学斌,周长红,来林,等.锡林浩特东部早白垩世白音高老组岩石地球化学特征、LA-MC-ICP-MS锆石U-Pb年龄及地质意义[J].地质与勘探,2015,51(2):290-301.
[18]司秋亮,崔天日,王恩德,等.大兴安岭柴河白音高老组流纹岩锆石U-Pb定年及成因探讨[J].东北大学学报(自然科学版),2016,37(3):412-415.
[19]黄明达,崔晓庄,裴圣良,等.兴安地块白音高老组流纹岩锆石U-Pb年龄及其构造意义[J].中国煤炭地质,2016,28(11):30-37.
[20]Ludwig K R.User’s manual for Isoplot/Ex,version 3.00.A geochronological toolkit for microsoft Excel[M].Berkeley Geochronology Center Special Publication No.4,2003.
(1)内蒙古区调队.1∶20万贺斯格乌拉牧场幅区域地质调查报告.1978.
(2)内蒙古地质调查院.1∶25万宝格达山林场幅区调报告.2011.
(3)内蒙古地质调查院.1∶25万霍林郭勒市幅区调报告.2011.
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