锡崖沟长城系大河组底部砾岩的形态特征与形成环境
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摘要
为研究华北克拉通形成环境,通过野外观察、采样、磨片观测、年代测试等方法,表征太行山南段锡崖沟长城系底部砾岩的宏观与微观特征,解析其形成环境与演化过程。结果表明,大河组底部砾岩物源来自下伏太古界基底的脉石英,是底砾岩。太古界地层经历了形成—遭受侵入—下沉至部分重熔—折返至地表—遭受风化、剥蚀、夷平—再下沉至海平面以下,而后遭受风暴形成大河组底砾岩,并发育丘状交错层理。该结果对华北克拉通构造演化研究具有重要的参考价值。
This paper describes an investigation into the formation environment of the North China craton by characterizing the macro and micro characteristics of the conglomerate at the bottom of the Changchengian system in Xiyagou,southern Taihang Mountains,using the methods such as field observation,sampling,abrasive observation,and dating,and thereby analyzing the formation environment and evolution process of the conglomerate. The results show that the conglomerate at the bottom of the Dahe formation derived from the vein quartz of the underlying Archaean basement occurs as a bottom conglomerate; and the Archaean strata occur as a result of the following process: formation,invasion,subsidence to partial remelting,return to the surface,weathering,erosion,flattening,subsidence below sea level,formation of the bottom conglomerate of the Dahe formation due to storms,and development of dome-like cross bedding. The results are of certain academic value to the study of the formation environment of the North China Craton.
This paper describes an investigation into the formation environment of the North China craton by characterizing the macro and micro characteristics of the conglomerate at the bottom of the Changchengian system in Xiyagou,southern Taihang Mountains,using the methods such as field observation,sampling,abrasive observation,and dating,and thereby analyzing the formation environment and evolution process of the conglomerate. The results show that the conglomerate at the bottom of the Dahe formation derived from the vein quartz of the underlying Archaean basement occurs as a bottom conglomerate; and the Archaean strata occur as a result of the following process: formation,invasion,subsidence to partial remelting,return to the surface,weathering,erosion,flattening,subsidence below sea level,formation of the bottom conglomerate of the Dahe formation due to storms,and development of dome-like cross bedding. The results are of certain academic value to the study of the formation environment of the North China Craton.
引文
[1]肖渊甫,郑荣才,邓江红.岩石学简明教程[M].北京:地质出版社,2009.
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[3]杨明春,郑常青,张梅生,等.辽宁兴城地区中元古界长城系大红峪组石英砂岩质砾岩古沉积环境研究[J].矿物岩石,2012,32(3):103-109.
[4]孙立新,黄学光.燕山中段常州沟组底砾岩的成因类型[J].地质通报,1999,18(3):284-288.
[5]赵金贵,刘东娜,姜慧慧,等.榆社群马会组底砾岩岩性特征及盆地物源分析[J].太原理工大学学报,2014,45(3):398-402.
[6]赵国春.华北克拉通基底主要构造单元变质作用演化及其若干问题讨论[J].岩石学报,2009,25(8):1772-1792.
[7]赖志云,赖伟庆.丘状交错层理的成因探讨[J].石油天然气学报,2010,32(5):42-45.
[8]项立辉,刘健,曹志敏.丘状交错层理研究述评[J].海洋地质前沿,2007,23(8):19-24.
[9] Dumas S,Arnott R W C. Origin of hummocky and swaley cross-strati-fication—The controlling influence of unidirectional current strengthand aggradation rate[J]. Geology,2006,34(12):1073-1076.
[2]肖竣文.迁安常州沟组底砾岩特征及成因分析[D].北京:中国地质大学(北京),2014.
[3]杨明春,郑常青,张梅生,等.辽宁兴城地区中元古界长城系大红峪组石英砂岩质砾岩古沉积环境研究[J].矿物岩石,2012,32(3):103-109.
[4]孙立新,黄学光.燕山中段常州沟组底砾岩的成因类型[J].地质通报,1999,18(3):284-288.
[5]赵金贵,刘东娜,姜慧慧,等.榆社群马会组底砾岩岩性特征及盆地物源分析[J].太原理工大学学报,2014,45(3):398-402.
[6]赵国春.华北克拉通基底主要构造单元变质作用演化及其若干问题讨论[J].岩石学报,2009,25(8):1772-1792.
[7]赖志云,赖伟庆.丘状交错层理的成因探讨[J].石油天然气学报,2010,32(5):42-45.
[8]项立辉,刘健,曹志敏.丘状交错层理研究述评[J].海洋地质前沿,2007,23(8):19-24.
[9] Dumas S,Arnott R W C. Origin of hummocky and swaley cross-strati-fication—The controlling influence of unidirectional current strengthand aggradation rate[J]. Geology,2006,34(12):1073-1076.