陕西宁强胡家坝地区震旦系灯影组风暴沉积特征
|
摘要
陕西宁强胡家坝地区新元古界震旦系灯影组出露较好,为一套碳酸盐岩和碎屑岩组合,岩性组合可划分为3段:藻白云岩段、高家山段和碑湾段,其中高家山段风暴沉积发育,为本文研究重点。风暴沉积构造特征在高家山剖面和狮子崖剖面各不相同,高家山剖面丘状交错层理发育,为风暴沉积典型特征;狮子崖剖面碎屑岩沉积可见底面构造、粒序层、水平层理现象等,灰岩层发育水平层理。通过野外实测、室内薄片鉴定等,认为高家山剖面高家山段中部化石层位为海水较浅的近源风暴沉积,而狮子崖相应层位为相对海水较深的远源风暴沉积。
The Neoproterozoic(Sinian) Dengying Formation in Hujiaba region, Ningqiang County, Shaanxi, is exposed well on the outcrops, which belongs to a set of carbonate rocks and detrital rocks. According to the lithological association, it can be divided into three members: algal dolomite Member, Gaojiashan Member and Beiwan Member. The storm deposit of Gaojiashan Member is developed well, which is taken as the key study object in this paper. Sedimentary structures of the storm deposit have differences between Gaojiashan profile and Shiziya profile. The hummocky cross-bedding is developed well in Gaojiashan profile, which belongs to the typical storm deposits. In the detrital rocks of Shiziya profile, there are the obvious sole structures, horizontal beddings, graded beddings etc.; in the limstones of Shiziya profile, there are developed for the parallel beddings. Through field survey and indoor thin-section microscopic identification, it is considered that the fossil-bearing layer of Gaojiashan mid-Member in Gaojiashan profile belongs to the proximal storm deposits of shallow sea, and the corresponding layer in Shiziya profile belongs to distal storm deposit of deep sea.
The Neoproterozoic(Sinian) Dengying Formation in Hujiaba region, Ningqiang County, Shaanxi, is exposed well on the outcrops, which belongs to a set of carbonate rocks and detrital rocks. According to the lithological association, it can be divided into three members: algal dolomite Member, Gaojiashan Member and Beiwan Member. The storm deposit of Gaojiashan Member is developed well, which is taken as the key study object in this paper. Sedimentary structures of the storm deposit have differences between Gaojiashan profile and Shiziya profile. The hummocky cross-bedding is developed well in Gaojiashan profile, which belongs to the typical storm deposits. In the detrital rocks of Shiziya profile, there are the obvious sole structures, horizontal beddings, graded beddings etc.; in the limstones of Shiziya profile, there are developed for the parallel beddings. Through field survey and indoor thin-section microscopic identification, it is considered that the fossil-bearing layer of Gaojiashan mid-Member in Gaojiashan profile belongs to the proximal storm deposits of shallow sea, and the corresponding layer in Shiziya profile belongs to distal storm deposit of deep sea.
引文
Aigner T,1982.Calcareous tem pestites Storm-dom inated stratification in upper Mus-chelkalk lin stones(Middle Trias SW-Gemany)[J].Cyclic and Event Stratification,181-195.
Campbell C V,1966.Truncated wave-ripple laminate[J].Journal Sedimentary Petrolo-gy,36:7~26.
Dot R H,Bourgeois J,1982.Hummocky stratigrafication:Significance of its variable bedding sequence[J].Geological Society of America Bullet in,90:663-680.
Goldring R,Bridges P.,1973.Sublittoral sheet sandstones[J].Journal Sedimentary Pet-rology,3:736~747.
Harms J C,et al.,1975.Depositional Environments as Interpreted from Primary Sedi-mentary Structures and Stratification Sequence[M].Texas:Society of Sedimentary Geology.
Leckie D A,Krystinik L A,1989.Is there evidence for geostrophic currents preserved in the sedimentary record of inner to middle-shelf deposits?[J].Journal of Sedimentary Petrology,59:862-870.
白万备,李建厚,孙长彦,2011.碳酸盐风暴沉积研究现状与进展[J].河南理工大学学报,30(4):427-428.
陈高潮,王炬川,张俊良,等,2012.扬子地块西北缘震旦系灯影组铅锌矿的成矿地质背景[J].地质通报,31(5):780-781.
陈瑞君,1980.沉积岩粒度分析和石英表面结构特征及其与沉积环境的关系[J].地质科学,(3):279-284.
蔡耀平,2011.陕西宁强埃迪卡拉纪晚期高家山生物群中的Conotubus hemiannulat-us及Gaojiashcyclus:化石埋藏学与古生态学研究[D].西安:西北大学.
华洪,张录易,张子福,等,2000.陕南末元古代高家山生物群主要化石类群及其特征[J].古生物学报,39(4):507-510.
华洪,张录易,张子福,等,2001.高家山生物群化石组合面貌及其特征[J].地层学杂志,25(1):13-16.
赖志云,赖伟庆,2010.丘状交错层理的成因探讨[J].石油天然气学报,32(5):42.
梁桂香,1994.风暴沉积及其构造背景[J].世界地质,13(3):131-134.
李朋,2008.高家山生物群沉积特征及碳同位素地球化学研究[D].西安:西北大学.
陆鹿,李壮福,叶嗣暄,等,2013.徐州地区新元古界赵好组风暴沉积特征分析[J].高校地质学报,19(3):523-525.
刘宝珺,张继庆,许效松,1986.四川兴文四龙下二叠统碳酸盐风暴岩[J].地质学报,(1):57-124.
马冀,刘卓,蔡耀平,等,2008.陕西宁强胡家坝地区晚埃迪卡拉世高家山生物群岩相变化与化石保存关系[J].古生物学报,47(2):223-228.
宋金民,杨迪,李朋威,等,2012.中国碳酸盐风暴岩发育特征及其地质意义[J].现代地质,26(3):594.
邵龙义,1993.湘中下石炭统风暴岩的研究[J].地质科学,(4):336-346.
王欣,华洪,李朋,等,2010.陕南早寒武世宽川铺生物群沉积环境及埋藏机制研究[J].古生物学报,49(1):126-128.
袁静,2006.中国山东惠民凹陷古近系风暴岩沉积特征及沉积模式[J].沉积学报,24(1):594.
尹崇玉,柳永清,高志林,等,2007.震旦(伊迪卡拉)纪早期磷酸盐化生物群-瓮安生物群特征及其环境演化[M].北京:地质出版社.
赵凤清,赵文平,左义成,等,2006.陕南汉中地区新元古代岩浆岩U-Pb年代学[J].地质通报,25(3):384.
朱筱敏,2008.沉积岩石学[M].北京:石油工业出版社.
赵灿,陈晓红,李旭兵,2013.峡东地区埃迪卡拉系灯影组风暴岩的发现及其环境意义[J].地质学报,87(12):1902-1906.
张录易,华洪,2001.震旦纪晚期管壳化石类群及其意义[J].古生物学报,39(3):326-330.
周进高,赵宗举,邓红婴,1999.淮南地区风暴岩特征及其沉积环境[J].石油勘探与开发,(5):73-76.
Campbell C V,1966.Truncated wave-ripple laminate[J].Journal Sedimentary Petrolo-gy,36:7~26.
Dot R H,Bourgeois J,1982.Hummocky stratigrafication:Significance of its variable bedding sequence[J].Geological Society of America Bullet in,90:663-680.
Goldring R,Bridges P.,1973.Sublittoral sheet sandstones[J].Journal Sedimentary Pet-rology,3:736~747.
Harms J C,et al.,1975.Depositional Environments as Interpreted from Primary Sedi-mentary Structures and Stratification Sequence[M].Texas:Society of Sedimentary Geology.
Leckie D A,Krystinik L A,1989.Is there evidence for geostrophic currents preserved in the sedimentary record of inner to middle-shelf deposits?[J].Journal of Sedimentary Petrology,59:862-870.
白万备,李建厚,孙长彦,2011.碳酸盐风暴沉积研究现状与进展[J].河南理工大学学报,30(4):427-428.
陈高潮,王炬川,张俊良,等,2012.扬子地块西北缘震旦系灯影组铅锌矿的成矿地质背景[J].地质通报,31(5):780-781.
陈瑞君,1980.沉积岩粒度分析和石英表面结构特征及其与沉积环境的关系[J].地质科学,(3):279-284.
蔡耀平,2011.陕西宁强埃迪卡拉纪晚期高家山生物群中的Conotubus hemiannulat-us及Gaojiashcyclus:化石埋藏学与古生态学研究[D].西安:西北大学.
华洪,张录易,张子福,等,2000.陕南末元古代高家山生物群主要化石类群及其特征[J].古生物学报,39(4):507-510.
华洪,张录易,张子福,等,2001.高家山生物群化石组合面貌及其特征[J].地层学杂志,25(1):13-16.
赖志云,赖伟庆,2010.丘状交错层理的成因探讨[J].石油天然气学报,32(5):42.
梁桂香,1994.风暴沉积及其构造背景[J].世界地质,13(3):131-134.
李朋,2008.高家山生物群沉积特征及碳同位素地球化学研究[D].西安:西北大学.
陆鹿,李壮福,叶嗣暄,等,2013.徐州地区新元古界赵好组风暴沉积特征分析[J].高校地质学报,19(3):523-525.
刘宝珺,张继庆,许效松,1986.四川兴文四龙下二叠统碳酸盐风暴岩[J].地质学报,(1):57-124.
马冀,刘卓,蔡耀平,等,2008.陕西宁强胡家坝地区晚埃迪卡拉世高家山生物群岩相变化与化石保存关系[J].古生物学报,47(2):223-228.
宋金民,杨迪,李朋威,等,2012.中国碳酸盐风暴岩发育特征及其地质意义[J].现代地质,26(3):594.
邵龙义,1993.湘中下石炭统风暴岩的研究[J].地质科学,(4):336-346.
王欣,华洪,李朋,等,2010.陕南早寒武世宽川铺生物群沉积环境及埋藏机制研究[J].古生物学报,49(1):126-128.
袁静,2006.中国山东惠民凹陷古近系风暴岩沉积特征及沉积模式[J].沉积学报,24(1):594.
尹崇玉,柳永清,高志林,等,2007.震旦(伊迪卡拉)纪早期磷酸盐化生物群-瓮安生物群特征及其环境演化[M].北京:地质出版社.
赵凤清,赵文平,左义成,等,2006.陕南汉中地区新元古代岩浆岩U-Pb年代学[J].地质通报,25(3):384.
朱筱敏,2008.沉积岩石学[M].北京:石油工业出版社.
赵灿,陈晓红,李旭兵,2013.峡东地区埃迪卡拉系灯影组风暴岩的发现及其环境意义[J].地质学报,87(12):1902-1906.
张录易,华洪,2001.震旦纪晚期管壳化石类群及其意义[J].古生物学报,39(3):326-330.
周进高,赵宗举,邓红婴,1999.淮南地区风暴岩特征及其沉积环境[J].石油勘探与开发,(5):73-76.