海洋地质与第四纪地质2009，Vol.29Issue(1)：47-52,6.DOI:10.3724/SP.J.1140.2009.01047
塔里木盆地中寒武统-下奥陶统泥晶灰岩地球化学与古海洋学
GEOCHEMICAL CHARACTERISTICS OF MIDDLE CAMBRIAN-EARLY ORDOVICIAN LIMESTONE AND PALEO-OCEAN RECONSTRUCTION BASED ON δ~(18)O_(SMOW),~(87)Sr/~(86)Sr AND RARE EARTH ELEMENTS.TARIM BASIN
摘要
Abstract
In the middle Cambrian to lower Ordovician of Tarim Basin, occurs a little limestone, which is the studied object in this research, aimed at seawater geochemical reconstruction. Geochemical results showed that a linear correlation was demonstrated between the oxygen isotope values and the MgO% content, which indicates that dolomitization will lead to higher oxygen isotope values. The intercept of the line on the δ~(18)O axis is -8. 6‰, representing the oxygen isotope value of original limstones, and the oxygen I-sotope value of paleo-seawater can be calculated with value of - 8. 9‰. The average ~(87)Sr/~(86)Sr value is 0. 708 918, which can be considered as the value of paleo-seawater. In the PAAS-normalized Rare Earth Elements diagram, LREE-enriched pattern can be seen in the studied limstones, which might represent the REE characteristics of paleo-seawater.关键词
中寒武统/下奥陶统/古海洋/化学组成/塔里木盆地Key words
δ~(18)O/ ~(87)Sr/~(86)Sr/ rare earth elements/Tarim Basin分类
天文与地球科学引用本文复制引用
陈永权,周新源..塔里木盆地中寒武统-下奥陶统泥晶灰岩地球化学与古海洋学[J].海洋地质与第四纪地质,2009,29(1):47-52,6.基金项目
中国石油塔里木油田分公司2006年度博士后科研项目. （）
