湖南四都坪南沱组沉积特征与古气候变化耦合关系
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摘要
运用现代冰川理论并结合南沱组冰碛岩研究现状,根据湖南四都坪南沱组宏观地层序列和微观构造特征,识别并总结2期冰期和2期间冰期沉积特点,认为冰碛岩前缘是沉积作用活跃地带,以重力碎屑流、浊流为特点,间冰期以深水和浅水的牵引流为特点。结合沉积作用与古气候、海平面变化特征,认为该区南沱组冰碛岩由古气候控制,海平面的起落导致形成不同的沉积类型。
On the basis of the modern theory of glacier and research progress of the Nantuo Formation tillite,this study summarized the sedimentary features of the two glacial periods and two interglacial periods in combination to the macroscopic stragtigraphic sequences and microscopic structures of the Nantuo Formation in Siduping of Hunan Province.The results show that the front margin of the tillite is an active zone of sedimentation characterized by gravitational debris flow and turbidity current.And the interglacial period was characteristic of deep and shallow water tractive current deposits.The sedimentation of the Nantuo Formation and change characteristic of paleoclimate and sea level suggest that the tillite of the Nantuo Formation was controlled by the paleoclimate and the big fluctuations of sea level resulted in various sedimentary types.
On the basis of the modern theory of glacier and research progress of the Nantuo Formation tillite,this study summarized the sedimentary features of the two glacial periods and two interglacial periods in combination to the macroscopic stragtigraphic sequences and microscopic structures of the Nantuo Formation in Siduping of Hunan Province.The results show that the front margin of the tillite is an active zone of sedimentation characterized by gravitational debris flow and turbidity current.And the interglacial period was characteristic of deep and shallow water tractive current deposits.The sedimentation of the Nantuo Formation and change characteristic of paleoclimate and sea level suggest that the tillite of the Nantuo Formation was controlled by the paleoclimate and the big fluctuations of sea level resulted in various sedimentary types.
引文
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[26]Suttner L J,Dutta P K.Alluvial sandstone composition and paleoclimate;I,Framework mineralogy[J].Journal of Sedimentary Research,1986,56(3):329-435.
[2]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.
[3]Willis B,Blackwelder E,Sargent H,etal.Stratigraphy of Shan-Tung[J].Research in China,1907,1(1):19-58.
[4]Grabau A W.The Sinian System[J].Acta Geological Sinica,1922,1(1/4):44-88.
[5]张启锐.湖北省宜昌县震旦系南沱组成因的新认识[J].地质科学,1995,30(2):147-152.
[6]赵自强,邢裕盛,马国干,等.湖北峡东震旦系[M].天津:科学技术出版社,1980:31-55.
[7]马国干,王砚耕.鄂、湘、川、黔毗邻地区早震旦世冰川地质问题的讨论[J].中国地质科学院宜昌研究所所刊,1983(7):43-52.
[8]陆松年,马国干,高振家,等.中国晚前寒武纪冰成岩系初探[M].北京:地质出版社,1985:1-86.
[9]瞿乐生,余林青,吴斯江,等.湖北省各时代岩相古地理研究之一:溯北省震旦纪岩相古地理[M].武汉:中国地质大学出版社,1990:89.
[10]刘鸿允.中国震旦系[M].北京:科学出版社,1991:1-388.
[11]李铨,冷坚.神农架上前寒武系[M].天津:科学技术出版社,1987:274-335.
[12]湖南地质矿产局.湖南岩石地层[M].武汉:中国地质大学出版社,1997:50-51.
[13]刘波.大庸市四都坪震旦系南沱组岩石特征及成因探讨[J].湖南地质,1990,9(4):43-50.
[14]王剑.华南新元古代裂谷盆地沉积演化---兼论与Rodinia解体的关系[D].成都:成都理工大学,1999:1-146.
[15]冯连君,储雪蕾,张启锐,等.化学蚀变指数(CIA)及其在新元古代碎屑岩中的应用[J].地学前缘,2003,10(4):539-543.
[16]冯连君,储雪蕾,张启锐,等.湘西北南华系渫水河组寒冷气候成因的新证据[J].科学通报,2004,49(12):1171-1178.
[17]王自强,尹崇玉,高林志,等.宜昌三斗坪地区南华系化学蚀变指数特征及南华系划分、对比的讨论[J].地质论评,2006,52(5):577-585.
[18]赵小明,刘圣德,张权绪,等.鄂西长阳南华系地球化学特征的气候指示意义及地层对比[J].地质学报,2011,85(4):576-585.
[19]刘波.华南震旦系冰川地层及冰川演化规律[J].成都理工大学学报(自然科学版),1991,18(2):40-47.
[20]Crossman M J.Large floods and climatic change during the Holocene on the Ara River,Central Japan[J].Geomorphology,2001,39(1/2):21-27.
[21]洪庆玉.沉积物重力流地质学[M].成都:成都科技大学出版社,1987:22-26.
[22]蔡雄飞,廖群安,王富明,等.新疆卡拉麦里碰撞带南缘志留-泥盆纪沉积学研究新进展[J].华东地质,2016,37(2):113-119.
[23]吴瑞棠,关保德.论罗圈组的冰成特征及重力流改造[J].地质学报,1988,62(1):78-89.
[24]Gravenor C P,Brunn V V,Dreimanis A.Nature and classification of waterlain glaciogenic sediments,exemplified by Pleistocene,Late Paleozoic and Late Precambrian deposits[J].Earth Science Reviews,1984,20(2):105-166.
[25]Kurtz D D,Anderson J B.Recognition and sedimentologic description(texture)of recent debris flow deposits from the Ross and weddell Seas,Antarctica[J].Journal of Sedimentary Petrology,1979,49(4):1159-1169.
[26]Suttner L J,Dutta P K.Alluvial sandstone composition and paleoclimate;I,Framework mineralogy[J].Journal of Sedimentary Research,1986,56(3):329-435.