| 宋 宏,许晓杰,李康宁,张君弟,翁玮俊,李 倩,涂 伟.甘肃天水丰望乡晶质石墨成矿特征与成因分析[J].甘肃地质,2026,35(1):50-57 |
| 甘肃天水丰望乡晶质石墨成矿特征与成因分析 |
| MINERALIZATION CHARACTERISTICS AND GENETIC ANALYSIS OF CRYSTALLINE GRAPHITE IN FENGWANG TOWNSHIP OF GANSU PROVINCE |
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| DOI：10.27027/j.cnki.ISSN2097-6704.2026.01.006 |
| 中文关键词: 晶质石墨 成矿特征 同位素 成因分析 天水丰望乡 |
| 英文关键词:crystalline graphite mineralization characteristic isotope genetic analysis Fengwang Township Gansu Province |
| 基金项目:甘肃省教育科技创新项目：高校教师创新基金项目（2025A-346，2025A-344，2025A-349）。 |
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| 中文摘要: |
| 为明确甘肃天水丰望乡晶质石墨成矿带的成矿潜力与成因机制，综合运用野外地质调查、TIMA矿物自动分析、C-O同位素测试及主微量元素分析等方法，对研究区石墨矿床开展系统研究。 结果表明：研究区含矿岩体主要为秦岭岩群条带状含石墨大理岩，石墨呈显微鳞片状分布，主要伴生矿物为方解石（含量63. 41% ~ 95. 06%）、白云石（1. 87% ~ 35. 92%）及少量黑云母、石英等；碳同位素δ13CV-PDB值介于-1. 28‰ ~ 2. 88‰之 间，指示碳质来源以沉积
有机质 为 主，受 变 质 作 用 改 造 明 显 ；主微量元素分析显示 ，矿 石SiO2含 量较低 （0. 25% ~ 2. 78%），CaO含 量较高（31. 31% ~ 54. 78%），稀土元素总量偏低且分布模式平缓，反映原岩为碳酸盐岩沉积建造；结合区域构造背景与矿物组合特征，判断矿床成因类型为区域变质型石墨矿床，成矿过程与秦岭造山带构造—热事件密切相关。 研究成果为天水地区晶质石墨资源勘查提供了理论依据，对甘肃省战略性矿产资源开发具有重要实践意义。 |
| 英文摘要: |
| To clarify the mineralization potential and genetic mechanism of the crystalline graphite metallogenic belt in Fengwang Township, Tianshui, Gansu Province, a systematic study was conducted on the graphite deposit in the research area by integrating multiple methods, including field geological surveys, TIMA
automated mineral analysis, C-O isotope analysis, and major and trace element analyses. The results show that: The ore -hosting rocks in the study area are mainly banded graphite -bearing marbles of the Qinling Group.Graphite occurs as microflaky aggregates, with major associated minerals including calcite （63. 41% ~95. 06%）, dolomite （1. 87% ~ 35.92%）, and minor biotite and quartz. The δ13 CV-PDB values of carbon isotopes range from -1.28‰ to 2.88‰, indicating that the carbon source is dominated by sedimentary organic matter, which has been significantly modified by metamorphism. Major and trace element analyses reveal that the ore samples have low SiO2 contents （0.25% ~ 2.78%） and high CaO contents （31.31% ~ 54.78%）. The total rare
earth element （REE） contents are relatively low, with a flat distribution pattern, suggesting that the protolith is a carbonate sedimentary formation. Combined with the regional tectonic setting and mineral assemblage characteristics, it is concluded that the deposit belongs to a regional metamorphic-type graphite deposit, and its mineralization process is closely related to the tectono-thermal events of the Qinling Orogenic Belt. The research
results provide a theoretical basis for the exploration of crystalline graphite resources in the Tianshui area and have important practical significance for the development of strategic mineral resources in Gansu Province. |
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