| 鲁西地区稀土矿床成矿系列划分与找矿新突破 |
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| 关键词:rare earth metallogenic series source of ore-forming materials new breakthroughs |
| 基金项目:山东省自然资源厅“山东省微山县郗山地区稀土矿深部及外围调查评价”(编号: 鲁勘字(2018)30号);山东地矿局基金项目“微山-枣庄地区稀土矿成矿作用及找矿方向研究”(编号: KC202104);“济宁市郗山地区稀土矿成矿机理研究”(编号: KY202207) |
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| New Breakthroughs in Metallogenic Series Division and Prospecting of Rare Earth Deposits in Western Shandong Province |
| Western Shandong region is an important rare earth base in China. Four rare earth mines (deposits) have been found and evaluated; namely, Xishan Extra Large Rare Earth Mine in Weishan County, the Zaozhuang Xuecheng Guandi Temple rare earth mine, the medium Lanling Longbaoshan rare earth mine, and the Zibo–Laiwu rare earth mine. The metallogenic series of rare earth deposits related to Late Yanshanian tectonic magmatism are determined based on recent research. According to the tectonic and magmatic conditions on which the formation of rare earth deposits depends, the deposit series was formed in the Mesozoic era and continued through the Late Yanshanian period. It is preliminarily divided into a rare earth ore forming subseries: a metallogenic sub series related to tectonic magma and magmatic hydrothermal, with a metallogenic age of (110±4.2) – (134.9±1.8) Ma. Through an isotope study of Xishan rare earth ore and Hujiazhuang rare earth ore, 18OV-SMOW in the calcite and ore body of Xishan rare earth ore was determined to be 8.2‰–9.1‰, δ13CV-PDB is –7.5‰ – –7.1‰, and the ore-forming materials and alkaline magma may originate from the upper mantle. The C isotope of Hujiazhuang rare earth bearing carbonatite shows mantle source characteristics, and the O isotope falls between the marine carbonatite and the mantle carbonatite, showing the characteristics of marine carbonatite. Therefore, it is speculated that the calcite mineral has undergone a late transformation into a secondary mineral, as a result of the water rock reaction of the ore-forming hydrothermal solution and the wall rock. The source of the ore-forming materials of the two minerals has mantle source characteristics, and the source of the ore-forming materials is similar. In accordance with the metallogenic series theory, systematic prospecting work was conducted in the Xishan rare earth ore deposit with the goal of finding the Mesozoic Chishan alkaline complex. One super-large rare earth deposit was discovered, confirming that the western Shandong region has suitable prospecting potential. |
| LAN Jun,ZHANG Peng,SUN Li,XING Nan,LI De-jian,YANG Yun-tao,LI Yi-xin,XIAO Ke-yan,XU Hong-yan,WANG Jian.2023.New Breakthroughs in Metallogenic Series Division and Prospecting of Rare Earth Deposits in Western Shandong Province[J].Acta Geoscientica Sinica,44(5):933-942. |
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