锡林浩特地区白垩系大磨拐河组的发现及其地质意义
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摘要
内蒙古锡林浩特市西南覆盖区经横向及垂向调查,发现了一套以砂岩、泥质粉砂岩、泥岩和页岩为主,并夹有煤层的地层,通过岩性组合对比,将其岩石地层单位厘定为大磨拐河组;并在该组二段发现了大量的孢粉化石,其组合面貌特征与我国北方早白垩世早期的分子面貌特征十分接近,其时代应为早白垩世Berriasian-Valanginian期;在该组二段还发现了叶肢介和狼鳍鱼化石,表现出了明显的早白垩世中期的特色,其时代应为早白垩世Barremian期。通过孢粉、叶肢介、鱼化石生物地层确定大磨拐河组的时间跨度为早白垩世Berriasian-Barremian期。
According to vertical geological survey, a series of strata mainly deposited by sandstone, siltstone, mudstone and shale with coal are discovered in the overlay area of Lamayinwusu, Xilinhot, Inner Mongolia. It is recognized as the Damoguaihe Formation by lithological comparison. A large number of sporopollen fossils are discovered in the second section of the core, whose features are similar to those found in Berriasian-Valanginian of Early Cretaceous in North China. The Conchostracans and Lycoptera fossils discovered in the second section of the core indicate the strata was deposited during Barremian of Early Cretaceous. Determined by sporopollen, conchostracans and fish fossils, the age of Damoguaihe Formation is Berriasian-Barremian of Early Cretaceous.
According to vertical geological survey, a series of strata mainly deposited by sandstone, siltstone, mudstone and shale with coal are discovered in the overlay area of Lamayinwusu, Xilinhot, Inner Mongolia. It is recognized as the Damoguaihe Formation by lithological comparison. A large number of sporopollen fossils are discovered in the second section of the core, whose features are similar to those found in Berriasian-Valanginian of Early Cretaceous in North China. The Conchostracans and Lycoptera fossils discovered in the second section of the core indicate the strata was deposited during Barremian of Early Cretaceous. Determined by sporopollen, conchostracans and fish fossils, the age of Damoguaihe Formation is Berriasian-Barremian of Early Cretaceous.
引文
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[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,1996:1-344.
[3] 中国地质大学(武汉)地质调查研究院.1∶5万锡林浩特幅、种蓄场桃林塔拉分场幅、锡林浩特炼铜厂幅、巴音胡硕分厂幅区域地质调查报告[R].武汉:中国地质大学(武汉)地质调查研究院,2012:1-319.
[4] 国土资源实物地质资料中心.1∶5万喇嘛音乌苏幅、乌拉吉吐幅、跃进公社幅、跃进公社三队幅区域地质调查报告[R].廊坊:国土资源实物地质资料中心,2013:1-356.
[5] 丁秋红,李永飞,张健,等.内蒙古乌兰盖盆地早白垩世孢粉组合[J].微体古生物学报,2010,27(2):159 -172.
[6] 黄清华,赵来时,卢占武,等.内蒙古海拉尔盆地大磨拐河组孢粉化石及其时代浅析[J].地质科技情报,2006,15(1):19-25.
[7] 郭椿杰.内蒙古霍林河盆地霍林河组下含煤段抱粉组合及其意义[J].石油勘探与开发,1995,22(4):37-44.
[8] 刘兆生.内蒙古固阳盆地早白垩世孢粉组合[J].地层学杂志,1983,7(1):33-36.
[9] 程金辉,尚玉珂.内蒙古满洲里扎赉诺尔煤矿早白垩世孢粉组合序列和古气候研究[J].古生物学报,2015,54(3):316-341.
[10] 刘兆生,安俊义.内蒙古钱家店盆地早白垩世协尔苏组抱粉组合[J].徽体古生物学报,1988,5(3):297-314.
[11] 李春柏,万传彪,乔秀云,等.海拉尔盆地海参1井伊敏组孢粉组合的地层意义[J].地层学杂志,2007,31(1):23-34.
[12] 蒙启安,万传彪,乔秀云,等.内蒙古海拉尔盆地大磨拐河组孢粉组合[J].地层学杂志,2003,27(3):173-184.
[13] 万传彪,乔秀云,孔惠,等.黑龙江北安地区早白垩世孢粉组合[J].微体古生物学报,2002,19(1):83-90.
[14] 薛云飞,王丽岩.海拉尔盆地查干诺尔凹陷扎赉诺尔群孢粉组合[J].中国煤炭地质,2010,22(1):6-14.
[15] 宋之琛,刘耕武,黎文本,等.内蒙古二连盆地早白垩世介形类和孢粉化石[M].合肥:安徽科学技术出版社,1986:106-334.
[16] 高瑞祺,赵传本,乔秀云,等.松辽盆地白垩纪石油地层孢粉学[M].北京:地质出版社,1999:1-373.
[17] 牛绍武,田树刚.辽西义县组叶肢介化石在冀北滦平盆地西瓜园组中的系统发现及其意义[J].地质通报,2008,27(6):753-768.
[18] 万晓樵,李罡,黄清华,等.中国白垩纪陆相阶的划分与对比[J].地层学杂志,2013,37(4):457-470.