| 冯坪子砂金矿成矿条件研究 |
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| 引用本文： | 邓云山,傅碧宏.冯坪子砂金矿成矿条件研究[J].沉积学报,1993,11(3):114-118. |
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| 作者姓名： | 邓云山 傅碧宏 |
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| 作者单位： | 中国科学院兰州地质研究所 |
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| 摘 要： | 陇南地区白龙江下游冯坪子位于西秦岭复杂构造带中,广泛发育碧口群绿片岩系,为含金初始矿源岩,第四纪以来,白龙江流域长期隆起剥蚀,对矿金运移富集提供了良好的地质环境,断陷带、构造谷负向部位成为砂金储集场所,冯坪子河漫滩采样分析结果表明,深度增加金品位增高,3.5～5m,7.5～11m为金富集段。
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| 关 键 词： | 砂金品位 碧口群 绿片岩系 |
| 收稿时间： | 1991-12-27 |
Study of the Genesis and the Enrichment Regularity of Fengpinzi Placer Gold Deposit |
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| Institution: | Lanzhou Institute of Geology, Chinese Academy of Sciences |
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| Abstract: | The study area of the lower reach of Bailongjiang river is located in Longnan area and belongs to southern Qinling folded belt of western Qinling complex structural zone. Bikou group of lower Silurain (Slbk) developed very well, which is a set of greenschist series metamorphosed by clastic rock, volcanic rock and carbonate rock of marine facies, and is the source rock of the placer gold. A lot of evidences on neotectonism indicate that Bailongjiang valley had been risen, and the strata were weathered and denuded since Quaternary Period, provided a favourable tectonic condition for migration and enrichment of the placer gold. The negative locations such as fault depression and tectonic valley become the storing site of the placer gold. Moreover, the warm, moist climate and powerful hydrodynamic power also provide a favourable condition for enrichment of the placer gold. According to the analytical results of heavy concentrate samples which collected from alluvial flat at Fengpingzi, grade of the placer gold increaes with the depth at vertical section, 3. 5 - 5m and 7. 5m -11m are enrichment section of the placer gold; the outside point bar, near midchannel is the distributive zone of high grade at transverse section. So the deep mining is suitable for the placer gold deposit of alluvial flat in lower reach of Bailongjiang. |
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