| 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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| 引用本文：赵国龙,张寄丹,王大伟,岳洪举,于庆洋,马新春,付红梅.2025.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[J].地球学报,46(2):321-332. |
| DOI：10.3975/cagsb.2024.052404 |
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| 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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| 中文摘要:黑龙江省萝北县云山石墨矿床石墨矿赋存于中—新元古界兴东岩群大盘道岩组下部结晶片岩中, 作为黑龙江乃至我国晶质石墨重要矿产区, 晶质石墨储量位居全国之首, 属超大型沉积变质型石墨矿床。本文以黑龙江萝北县云山石墨矿床为例, 通过对石墨矿石主量元素、微量元素及碳同位素分析和原岩恢复图解的判别, 初步确定云山石墨矿床石墨矿石原岩为副变质岩, 属于正常沉积岩, 原岩具有含碳质泥岩、砂质泥岩及碳质页岩的特征, 石墨矿石样品表现出明显Eu、Sr、Ti的负异常, Ｕ的正异常, 轻微Ce的负异常, 主要反映了石墨矿石原岩的原始沉积环境可能是浅海-半深海, 沉积岩原岩可能来自有机质堆积较多的海相沉积物。云山石墨矿石原岩的沉积构造环境主要为被动的大陆边缘。碳同位素分析显示, 石墨矿石δ13C值为–24.7‰ ~ –21.4‰, 大理岩δ13C值为6.28‰~7.09‰, 说明了石墨碳质来源为有机碳, 大理岩的碳质来源为无机碳。 |
| 中文关键词:萝北 云山石墨矿床 稀土元素 地球化学特征 δ13C 原岩恢复 碳质来源 |
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| Study on Geochemical Characteristics and Carbon Sources in Yunshan Graphite Deposit, Luobei County, Heilongjiang Province |
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| Abstract: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. |
| keywords:Luobei Yunshan graphite deposit rare earth elements geochemical characteristics δ13C primitive rock recovery carbon source |
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