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Rare Earth Elements and Yttrium(REY) Geochemistry of Reefal Limestones in the Ordovician, Tarim Basin, NW China and their Paleoenvironment Implications
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  • 英文篇名:Rare Earth Elements and Yttrium(REY) Geochemistry of Reefal Limestones in the Ordovician, Tarim Basin, NW China and their Paleoenvironment Implications
  • 作者:MENG ; Miaomiao ; LIU ; Xinxing ; FAN ; Tailiang ; Ian ; J.DUNCAN
  • 英文作者:MENG Miaomiao;LIU Xinxing;FAN Tailiang;Ian J.DUNCAN;Guangzhou Marine Geological Survey;School of Energy Resources, China University of Geosciences;School of Resources, Hebei GEO University;Bureau of Economic Geology, The University of Texas at Austin;
  • 英文关键词:rare earth elements and yttrium(REY);;limestones;;depositional environment;;Ordovician;;Tarim Basin
  • 中文刊名:Acta Geologica Sinica(English Edition)
  • 英文刊名:地质学报(英文版)
  • 机构:Guangzhou Marine Geological Survey;School of Energy Resources, China University of Geosciences;School of Resources, Hebei GEO University;Bureau of Economic Geology, The University of Texas at Austin;
  • 出版日期:2019-08-15
  • 出版单位:Acta Geologica Sinica(English Edition)
  • 年:2019
  • 期:04
  • 基金:supported by the National Natural Science Foundation of China (grant number 51574208);; the National 973 Program of China (grant number 2012CB214802);; the China Geological Survery Project (grant number DD20190217);; the China Scholar Council (grant number 201606400023) for providing the financial support
  • 语种:英文;
  • 页:144-158
  • 页数:15
  • CN:11-2001/P
  • ISSN:1000-9515
  • 分类号:P534.42;P59;P532
摘要
This study examines the rare earth elements and yttrium(REY) concentrations of twenty-five samples from the reef outcrop exposed along the Lianglitage Mountain in the Ordovician, Tarim Basin in China. The concentration analysis provides constraints on the paleoenvironment during reef deposition. Based on the detailed sedimentology and petrographic work, we divide the reef facies into four sub-facies: the base facies, reef-core facies, reef-flank facies, and sealing facies.The geochemical data(such as major and trace elements, carbon and oxygen isotopes, and REYs) are further used to study the coeval seawater characteristics as well as potential diagenesis overprints. The result indicated that the diagenesis has little effect on the REY patterns of the reefal limestones. The REY concentrations of the reefal limestones are overall low(ranging from 3.69 to 19.60 ppm, arithmetic mean=10.22 ppm, SD=5.4). The PAAS-normalized REY patterns are consistently flat compared to the typical well-oxidized, shallow marine water patterns. However, the light REE(LREE)depletions, positive La anomalies, negative Ce anomalies and positive Y anomalies, suggest that these reefal limestones are likely an indicative of contemporaneous seawater REY signals. The seawater-like Y/Ho ratios(average at 37.51) further support that REY signals in these limestones are likely a reflection of seawater with little diagenetic modifications. The low Y/Ho ratios presented only in the reef-flank facies and sealing facies are likely a suggestion of detrital contamination.Hence, this study confirms that REY patterns of the limestones at the base facies and reef-core facies can record ancient seawater information, and reefs can be used as a potential geochemical proxy for paleoenvironment studies throughout the Earth's history.
        This study examines the rare earth elements and yttrium(REY) concentrations of twenty-five samples from the reef outcrop exposed along the Lianglitage Mountain in the Ordovician, Tarim Basin in China. The concentration analysis provides constraints on the paleoenvironment during reef deposition. Based on the detailed sedimentology and petrographic work, we divide the reef facies into four sub-facies: the base facies, reef-core facies, reef-flank facies, and sealing facies.The geochemical data(such as major and trace elements, carbon and oxygen isotopes, and REYs) are further used to study the coeval seawater characteristics as well as potential diagenesis overprints. The result indicated that the diagenesis has little effect on the REY patterns of the reefal limestones. The REY concentrations of the reefal limestones are overall low(ranging from 3.69 to 19.60 ppm, arithmetic mean=10.22 ppm, SD=5.4). The PAAS-normalized REY patterns are consistently flat compared to the typical well-oxidized, shallow marine water patterns. However, the light REE(LREE)depletions, positive La anomalies, negative Ce anomalies and positive Y anomalies, suggest that these reefal limestones are likely an indicative of contemporaneous seawater REY signals. The seawater-like Y/Ho ratios(average at 37.51) further support that REY signals in these limestones are likely a reflection of seawater with little diagenetic modifications. The low Y/Ho ratios presented only in the reef-flank facies and sealing facies are likely a suggestion of detrital contamination.Hence, this study confirms that REY patterns of the limestones at the base facies and reef-core facies can record ancient seawater information, and reefs can be used as a potential geochemical proxy for paleoenvironment studies throughout the Earth's history.
引文
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