黔东渝东南地区南华纪沉积序列与沉积环境演变
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摘要
在南华系钻孔编录与野外剖面观察实测的基础上,结合近年来报道的同位素年龄对渝东南与黔东地区南华系进行了梳理,并对其沉积环境进行了讨论。其中铁丝坳组沉积环境为地堑盆地冰内水道,由数个退积型副层序构成低位体系域沉积。大塘坡组整体为间冰期沉积,一段为二级层序的海侵体系域沉积,见滑塌变形沉积构造,由一系列向上变深的退积型副层序组成;二、三段对应高位体系域,碳质、泥质逐渐减少,砂质含量逐渐增多,发育同沉积变形构造,由一系列向上变浅的进积型副层序组构成。南沱组为冰水沉积,发育滑塌褶皱、滑塌断层,局部见滑塌角砾。大量滑塌构造的发现为研究区南华纪发育一系列北东向的地堑盆地提供了较好的佐证。沉积环境的横向对比表明,研究区存在一个北西向南东倾斜的海底缓坡,为锰矿的沉积提供了良好的储集场所。
This paper discusses the sedimentary environment of Nanhua System on the basis of substantial and detailed drilling catalogs and observations of sections which are part of the Nanhua System,by checking up the stratum in the southeast of Chongqing and east of Guizhou combining with isotopic age reported in recent years.The depositional environment of Tiesi′ao Formatiom is inner ice tunnel of graben basin,trough cross-bedding and tabular cross bedding have been found in Tiesi′ao Formatiom,which is the LST.Most of dropstones which is the sign of glacial deposition have been destroyed.The first period of Datangpo Formatiom is transgressive system tract constituted by a series of retrograding sequence and slump deformed structures have been found in it.The carbonaceous and shale reduced gradually upwards in second and third period of Datangpo Formatiom which is HST composed by a series of retrogradation type parasequence set shallowing upward.Slump folds,slump faults and breccia have been found in Nantuo Formation which is glaciofluvial deposit.Plenty of slump bedding found in this area is the evidence of series of northeastwards pregraben basin in Nanhua System.Contradistinction of the regional sedimentary environment indicate that gentle slope which is leaning to the south east widespread in Nanhua System.The specific environment provides a good space for the enrichment of manganese.
This paper discusses the sedimentary environment of Nanhua System on the basis of substantial and detailed drilling catalogs and observations of sections which are part of the Nanhua System,by checking up the stratum in the southeast of Chongqing and east of Guizhou combining with isotopic age reported in recent years.The depositional environment of Tiesi′ao Formatiom is inner ice tunnel of graben basin,trough cross-bedding and tabular cross bedding have been found in Tiesi′ao Formatiom,which is the LST.Most of dropstones which is the sign of glacial deposition have been destroyed.The first period of Datangpo Formatiom is transgressive system tract constituted by a series of retrograding sequence and slump deformed structures have been found in it.The carbonaceous and shale reduced gradually upwards in second and third period of Datangpo Formatiom which is HST composed by a series of retrogradation type parasequence set shallowing upward.Slump folds,slump faults and breccia have been found in Nantuo Formation which is glaciofluvial deposit.Plenty of slump bedding found in this area is the evidence of series of northeastwards pregraben basin in Nanhua System.Contradistinction of the regional sedimentary environment indicate that gentle slope which is leaning to the south east widespread in Nanhua System.The specific environment provides a good space for the enrichment of manganese.
引文
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[26]覃英,周琦,张遂.黔东北地区南华纪锰矿基本特征[J].贵州地质,2005,22(4):246-251.
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[28]刘爱民,张命桥.黔东地区含锰岩系中微量元素Mn/Cr比值与锰矿成矿预测[J].贵州地质,2007,24(1):60-63.
[29]李任伟,张淑坤,雷加锦,等.震旦纪地层黄铁矿硫同位素组成时-空变化特征及扬子地块与晚元古超大陆关系的论证[J].地质科学,1996,31(3):209-217.
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[32]张启锐,储雪蕾,冯连君.关于华南板块新元古代冰川作用及其古纬度的讨论[J].科学通报,2009,54(7):978-980.
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[34]Piper J D A.The Neoproterozoic supercontinent:Rodinia or Palaeopangaea[J].Earth and Planetary Science Letters,2000,176:131-146
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