| 黑龙江省萝北县云山石墨矿床地球化学特征及碳质来源研究 |
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| 关键词:Luobei Yunshan graphite deposit rare earth elements geochemical characteristics δ13C primitive rock recovery carbon source |
| 基金项目:黑龙江省财政资金项目“黑龙江省萝北县云山石墨矿深部普查”(编号: KCZX-SMKC-2016001) |
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| Study on Geochemical Characteristics and Carbon Sources in Yunshan Graphite Deposit, Luobei County, Heilongjiang Province |
| The Yunshan graphite deposit in Luobei County, Heilongjiang Province, exists as a crystalline schist in the lower part of the Dapandao Formation of the Xingdong Group from the Mesoproterozoic era. As an important mineral area of crystal-line graphite in Heilongjiang Province and China, the reserves of crystalline graphite rank first in the country and are clas-sified as a super-large sedimentary metamorphic graphite deposit. This study uses the Yunshan graphite deposit in Luobei, Heilongjiang Province, as a case study. Through the analysis of major elements, trace elements, and carbon isotopes of the graphite ore and the discrimination of primitive rock restoration diagrams, it was preliminarily determined that the primitive rock of the Yunshan graphite ore deposit is a parapetamorphic rock, which is a normal sedimentary rock. This primitive rock exhibits characteristics of carbonaceous mudstone, sandy mudstone, and carbonaceous shale. The graphite ore samples show apparent negative anomalies of Eu, Sr, and Ti, positive anomalies of U, and slight negative anomalies of Ce. These anomalies suggest that the original sedimentary environment of the graphite ore primary rocks may have been a shallow sea or a semi-deep sea and that the sedimentary rocks may have been derived from marine sediments with high organic matter accumulation. The sedimentary tectonic environment of the Yunshan graphite ore protolith was pri-marily a passive continental margin. Carbon isotope analysis shows that the δ13C value of graphite ore ranges from –24.7‰ to –21.4‰, while that of marble ranges from 6.28‰ to 7.09‰, indicating that the carbon source of graphite is organic carbon and that of marble is inorganic carbon. |
| ZHAO Guolong,ZHANG Jidan,WANG Dawei,YUE Hongju,YU Qingyang,MA Xinchun,FU Hongmei.2025.Study on Geochemical Characteristics and Carbon Sources in Yunshan Graphite Deposit, Luobei County, Heilongjiang Province[J].Acta Geoscientica Sinica,46(2):321-332. |
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