滇东北阳新组一段与二段野外划分标志
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摘要
滇东北地区中二叠统阳新组灰岩广泛分布,该组划分的一段和二段在野外识别划分较为困难。通过近期的区域地质调查,笔者等从一段和二段各自的颜色深浅、岩层厚度及总体厚度的差异、豹皮(虎斑)灰岩的形态及发育状态、方解石团块、方解石脉等,以及钙质成分与硅质岩、硅质条带等硅质成分的多少、淡水方解石、风化铁疙瘩、海泡石等特殊矿物的出现等,诸多方面的差异可作为一段(栖霞组灰岩)与二段(茅口组灰岩)的划分标志。
Middle Permian Yangxin Formation limestone is widely distributed in NE Yunnan area. The field division of Member 1 and 2 of this Formation is difficult. In the recent regional geological survey, we have regarded the color dark or pale,difference of rock bed thickness and general thickness,the form and development state of leopard( tiger stripes) limestone,calcite nodule,vein,etc,calc,siliceous rock,band more or less,the occurrence of fresh water calcite,weathering Fe nodule,sepiolite,etc special mineral as the division criteria of Member 1( Qixia Formation limestone) and 2( Maokou Formation limestone).
Middle Permian Yangxin Formation limestone is widely distributed in NE Yunnan area. The field division of Member 1 and 2 of this Formation is difficult. In the recent regional geological survey, we have regarded the color dark or pale,difference of rock bed thickness and general thickness,the form and development state of leopard( tiger stripes) limestone,calcite nodule,vein,etc,calc,siliceous rock,band more or less,the occurrence of fresh water calcite,weathering Fe nodule,sepiolite,etc special mineral as the division criteria of Member 1( Qixia Formation limestone) and 2( Maokou Formation limestone).
引文
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[2]张遴信.论臭灰岩[J].地层学杂志,1983,7(3):184~190.
[3]陆鹿,李壮福,康鹏,张新.安徽巢北地区栖霞组臭灰岩段富有机质成因探讨[J].地质论评,2014,60(1):71~79.
[4]陈战杰,张镔.关于“豹皮灰岩”的成因[J].矿物岩石,1991,11(2):41~46.
[5]杨城芳.昆明附近二叠系灰岩中“虎斑构造”之成因[J].云南地质,1988,7(2):196~201.
[6]翟淳.论豹皮灰岩的成因[J].北京地质学院学报,1961(13):80~112.
[7]徐自强.论浙江北部早二叠世硅质岩层[J].地层学杂志,1995,15(4):315~322.
[8]邓国辉,龙军军.赣东北构造带中的“放射虫硅质岩”不是“茅口组硅质岩”[J].现代地质,2006,20(4):573~578.
[9]钟怡江,侯梅生等.重庆石柱中二叠统栖霞组和茅口组沉积微相[J].成都理工大学学报(自然科学版),2014,41(4):458~467.
[10]Calvert SE.Composition and origin of North Atlantic deep sea cherts[J].Contributions to Mineralogy and Petrology,1971,33:273~288.
[11]周新平,何幼斌等.川东地区二叠系结核状、条带状及团块状硅岩成因[J].古地理学报,2012,14(2):143~154.
[12]余瑜,林良彪等.川东南中二叠统茅口组硅质岩地球化学特征及形成环境[J].吉林大学学报(地球科学版),2015,45(增刊):1516.
[13]Kametaka M,Takebe M,Nagai H..Sedimentary environments of the Middle Permian phosphorite-chert complex from the northeast-ern Yangtze platform,China;the Gufeng Formation:a continen-tal shelf radiolarian chert[J].Sedimentary Geology,2005,174:197~222.
[14]刘新宇,颜佳新.华南地区二叠纪栖霞组燧石结核成因研究及其地质意义[J].沉积学报,2007,25(5):730~734.
[15]杨锐,李红,柳益群,雷川等.安徽巢湖地区中二叠统栖霞组灰岩中燧石成因[J].现代地质,2014,28(3):501~511.
[16]毕华.栖霞灰岩中隧石结核成因的新证据[J].地层学杂志,1994,18(4):214~216.
[17]Tobin K J.A survey of paleozoic microbial fossils in chert[J].Sedimentary Geology,2004,168(1~2):97~107.
[18]云南省地质局区域地质调查大队八分队.1∶20万曲靖幅地质报告[M].1980.
[19]云南省地质局区域地质调查大队八分队.1∶20万东川幅地质报告[M].1981.
[20]颜佳新,薛武强等.四川盆地西北缘中二叠世栖霞组和茅口组的分界[Z].第十届全国古地理学及沉积学学术会议论文摘要集,成都,2008.