梁定勇,李孙雄,魏昌欣,王勇,周进波,林义华,袁海军

• 1:海南省地质调查院

摘要(Abstract)：

对海南岛西南部东方地区的潮间带海滩岩以及新发现的高排村埋藏海滩岩进行了微区稀土元素与碳、氧同位素分析,结果表明:高排村海滩岩亮晶胶结物ΣREE值以及LREE/HREE比值在几种不同类型胶结物中是最低的,但与文石、微晶高镁方解石等胶结物相比,其差值并不明显,说明陆地渗流环境对胶结物的REE影响有限。不同类型胶结物具有类似的配分特征,表现为轻稀土亏损,重稀土曲线平缓,具有铈负异常特征,并且与二叠纪海水和现代东太平洋海水配分模式基本一致。根据胶结物碳、氧同位素计算的出的古盐度Z均值为130,古海水平均温度为27℃,显示为热带海洋环境,与海南岛西南部气候吻合,指示海滩岩胶结物可作为记录古气候的良好载体。

关键词(KeyWords)： 化学地层;地球化学特征;海滩岩;古气候;全新世;海南岛

Abstract:

Keywords:

基金项目(Foundation): 海南1/5万东方县、感城、板桥、莺歌海幅区域地质调查项目(编号:12120114072001)资助

作者(Author): 梁定勇,李孙雄,魏昌欣,王勇,周进波,林义华,袁海军

DOI: 10.19839/j.cnki.dcxzz.2018.01.012

参考文献(References)：

• 姜伟,余克服,王英辉,许慎栋.2016.稀土元素地球化学在珊瑚礁环境记录中的研究进展.热带海洋学报,35(2):62-74.
• 刘羿,彭子成,韦刚健,陈特固,Ang P O,贺剑峰,刘桂建.2006.香港西贡滨珊瑚REE的地球化学特征及其与海平面变化的关系.地球化学,35(5):31-539.
• 孙金龙,徐辉龙.2009.中国的海滩岩研究与进展.热带海洋学报,28(2):103-108.
• 田正隆,戴英,龙爱民,陈绍勇.2005.南沙群岛海域沉积物稀土元素地球化学研究.热带海洋学报,24(1),8-14.
• 王建华.1991.海南岛天涯海角和莺歌海海滩岩的特征与沉积,成岩环境.热带海洋,4:9-14.
• 王小林,金之钧,胡文碹,张军涛,钱一雄,朱井泉,李庆.2009.塔里木盆地下古生界白云石微区REE配分特征及其成因研究.中国科学(D辑),(6):721-733.
• 王中刚,于学元,赵振华.1986.国外稀土元素地球化学的进展.矿物岩石地球化学通报,89(11):2036-2045.
• 杨守业,李从先.1999.REE示踪沉积物物源研究进展.地球科学进展,14(2):164-167.
• 张秀莲.1985.碳酸盐岩中氧,碳稳定同位素与古盐度,古水温的关系.沉积学报,3(4):17-30.
• Akagi T,Hashimoto Y,Fu F F,Tsuno H,Tao H&Nakano Y.2004.Variation of the distribution coefficients of rare earth elements in modern coral-lattices:species and site dependencies.Geochimica et Cosmochimica Acta,68(10):2265-2273.
• Banner J L,Hanson G N&Meyers W J.1988.Rare earth element and Nd isotopic variations in regionally extensive dolomites from the Burlington-Keokuk Formation(Mississippian):Implications for REE mobility during carbonate diagenesis.Journal of Sedimentary Research,58(3):415-432.
• Derry L A,Kaufman A J&Jacobsen S B.1992.Sedimentary cycling and environmental change in the Late Proterozoic:evidence from stable and radiogenic isotopes.Geochimica et Cosmochimica Acta,56(3):1317-1329.
• Kaufman A J,Jacobsen S B&Knoll A H.1993.The Vendian record of Sr and C isotopic variations in seawater:implications for tectonics and paleoclimate.Earth and Planetary Science Letters,120(3):409-430.
• Keith M L&Weber J N.1964.Carbon and oxygen isotopic composition of selected limestones and fossils.Geochimica et Cosmochimica Acta,28(10):1787-1816.
• Nothdurft L D,Webb G E&Kamber B S.2004.Rare earth element geochemistry of Late Devonian reefal carbonates,Canning Basin,Western Australia:confirmation of a seawater REEproxy in ancient limestones.Geochimica et Cosmochimica Acta,68(2):263-283.
• Pourmand A,Dauphas N&Ireland T J.2012.A novel extraction chromatography and MC-ICP-MS technique for rapid analysis of REE,SC and Y:revising CI-chondrite and Post-Archean Australian Shale(PAAS)abundances.Chemical Geology,291(1):38-54.
• Qing H&Veizer J.1994.Oxygen and carbon isotopic composition of Ordovician brachiopods:Implications for coeval seawater.Geochimica et Cosmochimica Acta,58(20):4429-4442.
• Shields G&Stille P.2001.Diagenetic constraints on the use of cerium anomalies as palaeoseawater redox proxies:an isotopic and REE study of Cambrian phosphorites.Chemical Geology,175(1):29-48.
• Webb G E,Nothdurft L D,Kamber B S,Kloprogge J T&Zhao JX.2009.Rare earth element geochemistry of scleractinian coral skeleton during meteoric diagenesis:a sequence through neomorphism of aragonite to calcite.Sedimentology,56(5):1433-1463.