Sedimentary characteristics and its environmental significance of salt-bearing strata of the Member 4 of Paleocene Shashi Formation in southern margin of Jiangling Depression, Jianghan Basin
Wang Chunlian1, Liu Chenglin1, Hu Haibing2, Mao Jinsong2, Shen Lijian3, Zhao Haitong3
1 Institute of Mineral Resources，Chinese Academy of Geological Sciences，Beijing 100037 2 Xiangtan Salt Mine，Lixian 415400，Hunan 3 School of Earth Sciences and Resources，China University of Geosciences(Beijing)，Beijing 100083
Abstract：Based on drilling core and experimental analyses，the authors studied the sedimentary characteristics of salt-bearing strata of the Member 4 of Paleocene Shashi Formation in southern margin of Jiangling Depression of Jianghan Basin.The sedimentation of salt lake is characterized by multi-period，continuous and periodically alternating of fresh and salt water.Therefore，it has become the important research focus to study palaeoclimate and palaeoenvironment.The salt-bearing strata of the Member 4 of Shashi Formation in southern margin of Jiangling Depression is composed of non-sandstone，mainly peperite of evaporate mineral，carbonate mineral，terrigenous clay and fine detrital mineral.The layer thickness can be a few millimeter to a few dozen centimeters.The accumulated bed thickness is up to a few dozen centimeters to a few meters.Through comparison analysis of Fe，Mn，Al，Ca，Mg，Co，Ni，V，Cu content and Sr/Ba，Mg/Ca，V/(V+Ni)，Ni/Co，Cu/Zn ratio，the sedimentary characteristics and sedimentary environment of salt-bearing strata are studied systematically.It shows that the lake environment in the Yanjian Member of Shashi Formation is perennial relative deep delamination salt lake，which can be classified as brackish-water lake，semi-salt-water lake，salt-water lake and brine lake.The lake depth becomes shallow from downward to upward.Primary glauberite，typically warm facies saline minerals，is widely developed in this formation.The Fe2O3/FeO ratio represents drought climate.This feature reveals that the Paleocene Shashi Formation in southern margin of Jiangling Depression of Jianghan Basin is characterized by a drought and warm palaeoclimate.
Wang Chunlian,Liu Chenglin,Hu Haibing et al. Sedimentary characteristics and its environmental significance of salt-bearing strata of the Member 4 of Paleocene Shashi Formation in southern margin of Jiangling Depression, Jianghan Basin[J]. JOPC, 2012, 14(2): 165-175.
邓宏文，钱凯.1993.沉积地球化学与环境分析［M］.甘肃兰州: 甘肃科学技术出版社，1-262. 冯增昭.1993.沉积岩石学(上、下册)［M］.北京: 石油工业出版社，1-368(上册)，1-327(下册). 金秉福，林振宏，杨群慧，等.2002.沉积矿物学在陆缘海环境分析中的应用［J］.海洋地质与第四纪地质，22(3):113-117. 李春梅，蒲秀刚.2005.盐间非砂岩特殊油藏成藏机制与模式研究［J］.石油天然气学报，27(2):149-153. 李蕙生，孙永传.1996.古盐湖沉积体系［M］.湖北武汉: 中国地质大学出版社，117-137. 刘成林，陈永志，陈伟十，等.2006.罗布泊盐湖更新世晚期沉积钙芒硝包裹体特征及古气候意义探讨［J］.矿物学报，26(1):93-98. 刘成林，焦鹏程，王弭力，等.2007.罗布泊盐湖巨量钙芒硝沉积及其成钾效应分析［J］.矿床地质，26(3):322-329. 刘成林，焦鹏程，王弭力.2010.盆地钾盐找矿模型探讨［J］.矿床地质，29(4):581-592. 刘平略，周厚清，康桂云.1986.松辽盆地元素分布及其与沉积环境的关系［J］.大庆石油地质与开发，5(2): 11. 柳蓉，刘招君，孟庆涛，等.2010.抚顺盆地始新世古湖泊演化［J］.沉积学报，28(4):695-699. 蒲秀刚，漆智先，郑晓玲，等.2002.盐间非砂岩油藏基本石油地质特征及资源潜力［J］.石油勘探与开发，29(5):28-30. 孙永传，李蕙生.1986.碎屑岩沉积相和沉积环境［M］.北京: 地质出版社，1-187. 孙镇城，杨藩，张枝焕，等.1997.中国中新生代咸化湖泊沉积环境与油气生成［M］.北京: 石油工业出版社，1-194. 王典敷，汪仕忠.1998.盐湖油气地质［M］.北京: 石油工业出版社，1-35. 王弭力，刘成林，焦鹏程，等.2001.罗布泊盐湖钾盐资源［M］.北京: 地质出版社，73-77. 卫民.1999.生物标志的环境含义及其应用［J］.岩相古地理，19(1):32-58. 杨长清，陈孔全，程志强，等.2003.江陵凹陷形成演化与勘探潜力［J］.天然气工业，23(6):51-54. 袁静，赵澄林，张善文，等.2000.东营凹陷沙四段盐湖的深水成因模式［J］.沉积学报，18(1):114-118. 张会琼，王京彬，王玉往，等.2011.内蒙古大井锡多金属矿床脉岩的成矿与找矿意义［J］.地质与勘探，47(3):344-352. 张永生，王国力，杨玉卿，等.2005.江汉盆地潜江凹陷古近系盐湖沉积盐韵律及其古气候意义［J］.古地理学报，7(4):461-470. 张永生，杨玉卿，漆智先，等.2003.江汉盆地潜江凹陷古近系潜江组含盐岩系沉积特征与沉积环境［J］.古地理学报，5(l): 29-35. 郑绵平，赵元艺，刘俊英.1998.第四纪盐湖沉积与古气候［J］.第四纪研究，(4):297-307. Dinescu L C，Duliu O G，Andries E Ⅰ.2000.INAA study of the vertical distribution of some major and trace elements in lacustrine sediments of the Danube Delta［J］.Journal of Radio Analytical and Nuclear Chemistry，244(1):147-152. Dill H，Teschner M，Wehner H.1988.Petrography，inorganic and organic geochemistry of lower Permian Carbonaceous fan sequences(“Brand schiefer Series”)Federal Republic of Germany: Constraints to their paleogeography and assessment of their source rock potential［J］.Chemical Geology，67: 307-325. Hatch J R，Leventhal J S.1992.Relationship between inferred redox potential of the depositional environment and geochemistry of the Upper Pennsylvanian(Missourian)Stark Shale Member of the Dennis Limestone，Wabaunsee County，Kansas，USA［J］.Chemical Geology，99 \{(1/3)\}： 65-82. Jones B，Manning D A C.1994.Comparison of geological indices used for the interpretation of palaeoredox conditions in ancient mud-stones［J］.Chemical Geology，111: 111-129. Mongenot T，Tribovillard N P，Desprairies A， et al.1996.Trace elements palaeoenvironmental markers in strongly mature hydrocarbon source rocks: The Cretaceous La Luna Formation of Venezuela［J］.Sedimentary Geology，103: 23-37. Rais W R，Buckley F.1988.Degree of pyritization of iron as a palaeoenvironmental indicator of bottom water oxygenation［J］.Journal of Sedimentary Petrology，58(5):812-819.
