湖南怀化新路河地区的南华系
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摘要
1972年的1/20万《溆浦幅》区域地质调查报告说,从南沱组底到板溪群顶,只有江口组一个地层单位,岩性简单。经过考察,发现那里的"江口组"包含了现在江口群的长安组、富禄组的两界河段和古城段,以及间冰期的大塘坡组。其中古城段只见于区内的部分地区,而在其他一些地方则缺失;这里的大塘坡组与湘黔桂及相邻地区不同,它几乎全部为灰绿色板岩,完全不见黑色或炭质的板岩,底部也没有含锰层位,说明这里大塘坡组的沉积环境十分特殊。
The report of the regional geological reconnaissance in 1972 described the strta between the Nantuo Formation and the Banxi Group as a single unit,the "Jiangkou Formation" a stratigrphic term that has been fallen into disuse.Our recent field investigation has shown that the "Jiangkou Formation" includes the redefined Jiangkou Group and the interglacial Datangpo Formation.The Jiangkou Group in turn includes the Chang'an Formation and Fulu formations,the latter consisting of the Liangjiehe and Gucheng members.However,the Nanhuan stratigraphy of this area is characterized by several interesting features.First,contrary to the general belief that the Gucheng Member is widely distributed,this unit is missing in many places.Second,unlike elsewhere in South China where the Datangpo Formation consists mostly of black or carbonaceous shale and manganese-rich deposits(e.g.,in Hunan,Guizhou,and Northern Guangxi provinces),this unit in the study area is composed of grey-green slate,with little carbonaceous or manganese-bearing shale,highlighting the unusual sedimentary environment of the study area.
The report of the regional geological reconnaissance in 1972 described the strta between the Nantuo Formation and the Banxi Group as a single unit,the "Jiangkou Formation" a stratigrphic term that has been fallen into disuse.Our recent field investigation has shown that the "Jiangkou Formation" includes the redefined Jiangkou Group and the interglacial Datangpo Formation.The Jiangkou Group in turn includes the Chang'an Formation and Fulu formations,the latter consisting of the Liangjiehe and Gucheng members.However,the Nanhuan stratigraphy of this area is characterized by several interesting features.First,contrary to the general belief that the Gucheng Member is widely distributed,this unit is missing in many places.Second,unlike elsewhere in South China where the Datangpo Formation consists mostly of black or carbonaceous shale and manganese-rich deposits(e.g.,in Hunan,Guizhou,and Northern Guangxi provinces),this unit in the study area is composed of grey-green slate,with little carbonaceous or manganese-bearing shale,highlighting the unusual sedimentary environment of the study area.
引文
林树基,肖加飞,卢定彪,刘爱民,牟世勇,陈仁,易成兴,王兴理.2010.湘黔桂交界区富禄组与富禄间冰期的再划分.地质通报,29:195-204
覃英,周琦,张遂.2005.黔东北地区南华纪锰矿基本特征.贵州地质,22(4):246-251
薛耀松,曹瑞骥,唐天福,尹磊明,俞从流,杨杰东.2001.扬子区震旦纪地层序列和南、北方震旦系对比.地层学杂志,25(3):207-234
张启锐,储雪蕾.2006.扬子地区江口冰期地层的划分对比与南华系层型剖面.地层学杂志,30(4):306-314
张启锐,储雪蕾.2007.南华系建系问题讨论.地层学杂志,31(3):222-228
张启锐,储雪蕾,冯连君.2008.南华系“渫水河组”的对比及其冰川沉积特征的探讨.地层学杂志,32(3):246-252
郑永飞.2003.新元古代岩浆活动与全球变化.科学通报,48:1705-1720
Feng Lian-jun,Chu Xue-lei,Huang Jing,Zhang Qi-rui&Chang H-J.2010.Reconstruction of paleo-redox conditions and early sul-fur cycling during deposition of the Cryogenian Datangpo For-mation in South China”.Gondwana Research,18:632-637
Macdonald F A,Schmitz M D,Crowley J L,Roots C F,Jones D S,Maloof A C,Strauss J V,Cohen P A,Johnston D T&Schrag D P.2010.Calibrating the Cryogenian.Science,327(5970):1241-1243
Zhang Q R,Li X H,Feng L J,Huang Jing&Song B.2008.A new age constraint on the onset of the Neoproterozoic glaciations in the Yangtze Platform,South China.J Geology,116:423-429
覃英,周琦,张遂.2005.黔东北地区南华纪锰矿基本特征.贵州地质,22(4):246-251
薛耀松,曹瑞骥,唐天福,尹磊明,俞从流,杨杰东.2001.扬子区震旦纪地层序列和南、北方震旦系对比.地层学杂志,25(3):207-234
张启锐,储雪蕾.2006.扬子地区江口冰期地层的划分对比与南华系层型剖面.地层学杂志,30(4):306-314
张启锐,储雪蕾.2007.南华系建系问题讨论.地层学杂志,31(3):222-228
张启锐,储雪蕾,冯连君.2008.南华系“渫水河组”的对比及其冰川沉积特征的探讨.地层学杂志,32(3):246-252
郑永飞.2003.新元古代岩浆活动与全球变化.科学通报,48:1705-1720
Feng Lian-jun,Chu Xue-lei,Huang Jing,Zhang Qi-rui&Chang H-J.2010.Reconstruction of paleo-redox conditions and early sul-fur cycling during deposition of the Cryogenian Datangpo For-mation in South China”.Gondwana Research,18:632-637
Macdonald F A,Schmitz M D,Crowley J L,Roots C F,Jones D S,Maloof A C,Strauss J V,Cohen P A,Johnston D T&Schrag D P.2010.Calibrating the Cryogenian.Science,327(5970):1241-1243
Zhang Q R,Li X H,Feng L J,Huang Jing&Song B.2008.A new age constraint on the onset of the Neoproterozoic glaciations in the Yangtze Platform,South China.J Geology,116:423-429