CHEN Yongquan, ZHOU Xinyuan. GEOCHEMICAL CHARACTERISTICS OF MIDDLE CAMBRIAN-EARLY ORDOVICIAN LIMESTONE AND PALEO-OCEAN RECONSTRUCTION BASED ON δ18OSMOW, 87Sr/86Sr AND RARE EARTH ELEMENTS, TARIM BASIN[J]. Marine Geology & Quaternary Geology, 2009, 29(1): 47-52. DOI: 10.3724/SP.J.1140.2009.01047
Citation: CHEN Yongquan, ZHOU Xinyuan. GEOCHEMICAL CHARACTERISTICS OF MIDDLE CAMBRIAN-EARLY ORDOVICIAN LIMESTONE AND PALEO-OCEAN RECONSTRUCTION BASED ON δ18OSMOW, 87Sr/86Sr AND RARE EARTH ELEMENTS, TARIM BASIN[J]. Marine Geology & Quaternary Geology, 2009, 29(1): 47-52. DOI: 10.3724/SP.J.1140.2009.01047
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GEOCHEMICAL CHARACTERISTICS OF MIDDLE CAMBRIAN-EARLY ORDOVICIAN LIMESTONE AND PALEO-OCEAN RECONSTRUCTION BASED ON δ18OSMOW, 87Sr/86Sr AND RARE EARTH ELEMENTS, TARIM BASIN

  • Tarim Oil Field Company Exploration and Development Research Institute, Korla 841000, China

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  • Received Date: September 09, 2008
  • Revised Date: December 27, 2008
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    • 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 δ18O axis is -8.6‰, representing the oxygen isotope value of original limstones, and the oxygen isotope value of paleo-seawater can be calculated with value of -8.9‰. The average 87Sr/86Sr 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.
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    • References (18)
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