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
投稿时间:2024-03-04  修订日期:2024-05-16  点此下载全文
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作者单位邮编
赵国龙* 黑龙江省第六地质勘查院 154002
基金项目:黑龙江省萝北县云山石墨矿深部普查项目KCZX-SMKC-2016001
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明显的被动的大陆边缘。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:地球化学特征  原岩恢复  碳质来源  云山
 
Geochemical characteristics and carbon sources of Yunshan graphite deposit in Luobei County, Heilongjiang Province
Abstract:Yunshan graphite deposit in Luobei County, Heilongjiang Province exists in the crystalline schist at the lower part of Dapandao Formation of Xingdong Group in Mesoproterozoic. As an important mineral area of crystalline graphite in Heilongjiang Province and even in China, the reserves of crystalline graphite rank first in China, belonging to a super-large sedimentary metamorphic graphite deposit. This paper takes Yunshan graphite deposit in Luobei, Heilongjiang Province as an example. Through the analysis of major elements, trace elements and carbon isotopes of graphite ore and the discrimination of primitive rock restoration diagram, it is preliminatively determined that the primitive rock of Yunshan graphite ore deposit is a parapetamorphic rock, which belongs to normal sedimentary rock. The primitive rock has the characteristics of carbonaceous mudstone, sandy mudstone and carbonaceous shale. The graphite ore samples show obvious negative anomalies of Eu, Sr and Ti, positive anomalies of U and slight negative anomalies of Ce, which mainly reflect that the original sedimentary environment of the graphite ore primary rocks may be shallow sea or half deep sea, and the sedimentary rocks may come from Marine sediments with more organic matter accumulation. The sedimentary tectonic environment of Yunshan graphite ore protolith is mainly passive continental margin. Carbon isotope analysis shows that the δ13C value of graphite ore is -24.7‰ ~ -21.4‰, and that of marble is 6.28‰ ~ 7.09‰, which indicates that the carbon source of graphite is organic carbon and that of marble is inorganic carbon.
keywords:Geochemical characteristics  Primitive rock recovery  Carbon source  Yunshan
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