河北涉县巨鲕粒灰岩的成因及地质意义
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摘要
鲕粒,一直存在化学成因和生物成因的争论,其实这两种成因都客观存在,而且存在两种成因都有的混合成因。对涉县寒武系张夏组地层中发现的巨型鲕粒,通过手标本和薄片观察,发现鲕粒形成前期属于化学成因,受水动力条件的限制,化学成因的鲕层最大生长直径5mm左右。后期鲕粒圈层通过与核形石和藻叠层的微观对比,确定属于生物成因,且生物有一个从繁盛到消亡的过程。鲕粒的生长终止于一层泥质薄膜,被含骨屑和泥质的泥晶方解石所胶结。
There have been controversies about chemical and biological origins of ooids.In fact,both of these causes exist objectively,and there are exist the mixing causes.The giant ooids found in the Zhangxia Formation of the Cambrian in Shexian county were researched by observing samples and thin sections.The ooids were found that their early stage forming were chemical cause.Due to the limitation of the hydrodynamic conditions,the chemical layers of ooids were grown to a maximum diameter of about 5 mm.The later stage of ooids forming was identified as a biological cause by comparing microscopically with oncolite and stromatolite,and the organism had a process from prosperity to demise.The growth of ooids terminated in a layer of argillaceous film,that was cemented by micritic calcite containing biological debris and clay.
There have been controversies about chemical and biological origins of ooids.In fact,both of these causes exist objectively,and there are exist the mixing causes.The giant ooids found in the Zhangxia Formation of the Cambrian in Shexian county were researched by observing samples and thin sections.The ooids were found that their early stage forming were chemical cause.Due to the limitation of the hydrodynamic conditions,the chemical layers of ooids were grown to a maximum diameter of about 5 mm.The later stage of ooids forming was identified as a biological cause by comparing microscopically with oncolite and stromatolite,and the organism had a process from prosperity to demise.The growth of ooids terminated in a layer of argillaceous film,that was cemented by micritic calcite containing biological debris and clay.
引文
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[6]李飞,王夏,薛武强,等.一种新的错时相沉积物:巨鲕及其环境意义[J].沉积学报,2010,28(3):585-595.
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[12]赵震.核形石雏形---弥散粒:以天津蓟县雾迷山组为例[J].沉积学报,1992,10(2):19-27.
[13]杨仁超,樊爱萍,韩作振,等.核形石研究现状与展望[J].地球科学进展,2011,26(5):465-474.
[14]Pelagic manganese nodules:a new type of oncolites[J].Acta Geologica Sinica(English edition),1997(1):43-48,115-116.
[15]李凌,谭秀成,曾伟,等.四川盆地震旦系灯影组灰泥丘发育特征及储集意义[J].石油勘探与开发,2013,40(6):666-673.
[16]梁玉左,朱士兴,高振家,等.叠层石研究的新进展:微生物岩[J].中国区域地质,1995(1):57-65,43.
[17]金瞰昆.江苏徐州大北望寒武系鲕粒及鲕粒灰岩特征[J].岩相古地理,1998,18(5):21-27.
[18]梅冥相.显生宙罕见的巨鲕及其鲕粒形态多样性的意义:以湖北利川下三叠统大冶组为例[J].现代地质,2008,22(5):683-698.
[2]梅冥相.鲕粒成因研究的新进展[J].沉积学报,2012,30(1):20-32.
[3]CAROZZI A V.Microscopic sedimentary petrography[M].New York:Wiley,1960:216-217.
[4]赵澄林,朱筱敏.沉积岩石学[M].北京:石油工业出版社,2001:152-155.
[5]齐永安,杨小伟,代明月,等.豫西登封地区寒武系第三统鲕粒和鲕粒灰岩演化及其意义[J].古地理学报,2014,16(1):55-64.
[6]李飞,王夏,薛武强,等.一种新的错时相沉积物:巨鲕及其环境意义[J].沉积学报,2010,28(3):585-595.
[7]地质矿产部.河北省北京市天津市区域地质志[M].北京:地质出版社,1982:116-149.
[8]周书欣.碳酸盐鲕粒的成因与鉴别[J].地质地球化学,1982(1):16-19.
[9]桑龙康,马昌前.岩石学[M].北京:地质出版社,2012:320-330.
[10]CHEPIL W S.Equilibrium of silt grains at the threshold of movement by wind[J].Soil.Sci.Proc.1959,23:422-428.
[11]周蒂.利用沉积物粒度数据反演沉积水动力参数[J].地质科学,1999(1):49-58.
[12]赵震.核形石雏形---弥散粒:以天津蓟县雾迷山组为例[J].沉积学报,1992,10(2):19-27.
[13]杨仁超,樊爱萍,韩作振,等.核形石研究现状与展望[J].地球科学进展,2011,26(5):465-474.
[14]Pelagic manganese nodules:a new type of oncolites[J].Acta Geologica Sinica(English edition),1997(1):43-48,115-116.
[15]李凌,谭秀成,曾伟,等.四川盆地震旦系灯影组灰泥丘发育特征及储集意义[J].石油勘探与开发,2013,40(6):666-673.
[16]梁玉左,朱士兴,高振家,等.叠层石研究的新进展:微生物岩[J].中国区域地质,1995(1):57-65,43.
[17]金瞰昆.江苏徐州大北望寒武系鲕粒及鲕粒灰岩特征[J].岩相古地理,1998,18(5):21-27.
[18]梅冥相.显生宙罕见的巨鲕及其鲕粒形态多样性的意义:以湖北利川下三叠统大冶组为例[J].现代地质,2008,22(5):683-698.