Geochemistry of Rare Earth Elements of Mesozoic-Cenozoic Sandstones in North Margin of Dabie Mountains and Adjacent Areas:Constraints to Source Rocks
来源期刊：JOURNAL OF RARE EARTHS2004年第4期
论文作者：王道轩 李任伟 岳书仓 金福全 刘因 李双应 孟庆任
Key words：geochemistry; Mesozoic-Cenozoic sandstones; source rocks; the north margin of the Dabie Mountains; rare earths;
Abstract: Based on the study of REE in Mesozoic-Cenozoic sandstones, the paper indicates that Jurassic Fanghushan and Yuantongshan Formations and Lower Cretaceous Zhougongshan Formation have ∑REE of 157 μg·g-1, δEu of 0.69 and (La/Yb)N of 11.1, which are similar to the Foziling and Luzhenguan Groups, and it implies that the latter may be the source rocks of the former. The Sanjianpu and Heishidu Formations have high REE concentrations (∑REE=264.8 μg·g-1, 328.2 μg·g-1 respectively), high Eu anomaly (δEu=0.57, 0.67 respectively) and lower Eu/Sm ratios (0.18～0.19), which differs from existent metamorphic rocks in the Dabie Mountains, so where their source rocks came from remains to be studied. The REE features of the Zhengyangguan Formation can be comparable to the Dabie complex and Luzhenguan Group, which shows that the Dabie complex had suffered unroofing in Neocene and constituted the source rocks. Mesozoic sandstones in Huainan area have lower REE concentrations (∑REE=80.9 μg·g-1), high Eu anomaly (δEu=0.66) and (La/Yb)N of 5.7, and it indicates that their source rocks may not come from the Dabie Mountains.
王道轩1，李任伟2，岳书仓1，金福全1，刘因1，李双应1，孟庆任2
(1.Department of Natural Resources and Environmental Science,Hefei University of Technology,Hefei 230009,China;
2.Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China)
Abstract:Based on the study of REE in Mesozoic-Cenozoic sandstones, the paper indicates that Jurassic Fanghushan and Yuantongshan Formations and Lower Cretaceous Zhougongshan Formation have ∑REE of 157 μg·g-1, δEu of 0.69 and (La/Yb)N of 11.1, which are similar to the Foziling and Luzhenguan Groups, and it implies that the latter may be the source rocks of the former. The Sanjianpu and Heishidu Formations have high REE concentrations (∑REE=264.8 μg·g-1, 328.2 μg·g-1 respectively), high Eu anomaly (δEu=0.57, 0.67 respectively) and lower Eu/Sm ratios (0.18～0.19), which differs from existent metamorphic rocks in the Dabie Mountains, so where their source rocks came from remains to be studied. The REE features of the Zhengyangguan Formation can be comparable to the Dabie complex and Luzhenguan Group, which shows that the Dabie complex had suffered unroofing in Neocene and constituted the source rocks. Mesozoic sandstones in Huainan area have lower REE concentrations (∑REE=80.9 μg·g-1), high Eu anomaly (δEu=0.66) and (La/Yb)N of 5.7, and it indicates that their source rocks may not come from the Dabie Mountains.
Key words:geochemistry; Mesozoic-Cenozoic sandstones; source rocks; the north margin of the Dabie Mountains; rare earths;
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