辽东本溪地区中生界三叠系下统红砬组基本层序与剖面模型研究
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摘要
文章依据辽宁桥头等四幅1︰5万区调资料,运用沉积学、地层学、层序地层学等现代前缘地学理论,首次系统地对辽东本溪地区中生界三叠系下统红砬组进行基本层序划分及剖面模型研究。研究结果表明,区内红砬组出露齐全,底顶界面清楚,为一套河流相沉积的红色岩系;其从下至上共划分出11个基本层序,内部由四个沉积单元组成。总体上每一个基本层序代表了一个由河道→边滩→河漫滩的曲流河沉积层序,因受当时沉积环境差异,各细层在每个基本层序中发育程度不同,有的被兼并,有的不发育;基本层序的平均厚度为34.5m。对每一种基本层序内部组成、沉积环境进行了详细地论述,并在此基础上建立了该组剖面模型,计算出四个沉积单元的厚度比例为A层13%、B层24%、C层14%、D层49%。
Based on data from 4 sheets of geological map of Qiaotou area etc.at scale 1∶50000 the modern earth science frontiers' theories,shuc as sedimentology,stratigraphy and sequential stratigraphy are first used to study the basic sequence and section model of Hongla Formation of Mesozoic Lower Trassic Series in Benxi area of Liaoning province.The result shows that Hongla Formation is completely exposed with clear top and bottom interfaces.It is a red river sedimentary sequence.From bottom to top the sequence is divided into 11 basic sequences and 4 sedimentary units.Generally,each basic sequence represents a river way→marginal bank→flood plain curved river sedimentary sequence.Due to their different sedimentary environments development of their each thin layer is varied.Some times the thin layer is merged or not developed.The basic sequences are averagely 34.5 mthick.The constituent and sedimentary environment of each basic sequence are detailed.Based on the details section model of the formation is built.Thickness percentage of the 4 sedimentary units are calculated,i.e.unit A,13%,unit B 24%,unit C,14%,unit D 49%.
Based on data from 4 sheets of geological map of Qiaotou area etc.at scale 1∶50000 the modern earth science frontiers' theories,shuc as sedimentology,stratigraphy and sequential stratigraphy are first used to study the basic sequence and section model of Hongla Formation of Mesozoic Lower Trassic Series in Benxi area of Liaoning province.The result shows that Hongla Formation is completely exposed with clear top and bottom interfaces.It is a red river sedimentary sequence.From bottom to top the sequence is divided into 11 basic sequences and 4 sedimentary units.Generally,each basic sequence represents a river way→marginal bank→flood plain curved river sedimentary sequence.Due to their different sedimentary environments development of their each thin layer is varied.Some times the thin layer is merged or not developed.The basic sequences are averagely 34.5 mthick.The constituent and sedimentary environment of each basic sequence are detailed.Based on the details section model of the formation is built.Thickness percentage of the 4 sedimentary units are calculated,i.e.unit A,13%,unit B 24%,unit C,14%,unit D 49%.
引文
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[16]崔培龙.鞍山—本溪地区铁建造型铁矿成矿构造环境与成矿、找矿模式研究[D].长春:吉林大学,2014.
[17]吴子杰,潘玉啟,包洪伟,等.辽东太子河地区中寒武世古气候特征[J].地质学刊,2014(4):561-566.
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[19]吴子杰,王烜,潘玉啟,等.辽东本溪地区新元古界青白口系岩石地层格架及模型[J].地质找矿论丛,2016,31(1):87-91.
[2]蔡雄飞,印纯清,章泽军,等.基本层序标志层在1∶50 000区调中的应用及意义[J].岩相古地理,1997(3):60-66.
[3]蔡雄飞,张雄华,章泽军.基本层序和相分析是区调中组建立的基础[J].地层学杂志,1999(3):48-52.
[4]张雄华,赵志刚,黄兴,等.论基本层序[J].地层学杂志,2013(4):565-566.
[5]ANDERSON E J,GOODWIN P W.The Significance of meter-scale allocycles in the quest for a fundamental stratigraphic unit[J].The Journal of Geological Society,1990,147(3):507-518.
[6]王鸿祯,史晓颖.沉积层序及海平面旋回的分类级别—旋回周期的成因讨论[J].现代地质,1998,12(1):1-16.
[7]MITCHUM R M,VAN WAGONER J C.High-frequency sequences and their stacking pattern:sequence stratigraphic evidence of high frequency eustatic cycles[J].Sedimentary Geology,1991,70(1):131-160.
[8]VAIL P R,MITCHUM R M,THOMPSONⅢS.Seismic Stratigraphy and Global Change in Sea Level,Part 3:Relative Change af Sea Level from Coastal Onlap[C]//Payton Seismic stratigraphy applications to hydrocarbon exploration.Tulsa:The American Association of petroleum Geologists,AAPG Memoir,1977,26:83-97.
[9]梅冥相,马永生.华北地台晚寒武世层序地层及其与北美地台海平面变化的对比[J].沉积与特提斯地质,2003(4):14-26.
[10]Krumbein W C,Sloss L L.Stratigraphy and Sedimentation[M].San Francisco:W.H.Freeman,1963:660.
[11]张丽旭.南票炭田南半の古生層に就にて[J].JOUR.GEOL.SOC.MANCH,1943,№.4-5.
[12]辽宁省地质矿产勘查开发局.全国地层多重划分对比研究:辽宁省岩石地层[M].武汉:中国地质大学出版社,1997.
[13]地质矿产部直属单位管理局.沉积岩区1∶5万区域地质填图方法指南[M].武汉:中国地质大学出版社,1991.
[14]宋学宗,冯锺广,朱志澄,等.本溪桥头区域地质调查报告节要[J].地质论评,1951(1):66-67.
[15]巩恩普.辽宁本溪本溪组生物礁的发现[J].地层学杂志,1992(3):222-228.
[16]崔培龙.鞍山—本溪地区铁建造型铁矿成矿构造环境与成矿、找矿模式研究[D].长春:吉林大学,2014.
[17]吴子杰,潘玉啟,包洪伟,等.辽东太子河地区中寒武世古气候特征[J].地质学刊,2014(4):561-566.
[18]吴子杰,潘玉啟,包洪伟,等.辽东太子河地区寒武系中统层序地层划分及特征[J].地质与资源,2015(4):295-300.
[19]吴子杰,王烜,潘玉啟,等.辽东本溪地区新元古界青白口系岩石地层格架及模型[J].地质找矿论丛,2016,31(1):87-91.