| 黄绍锋.菲律宾达沃砂金矿中金汞矿物研究及其找矿意义[J].地质与勘探,2011,47(5):935-942 |
| 菲律宾达沃砂金矿中金汞矿物研究及其找矿意义 |
| Mineralogical Characteristics of Gold-mercury Mineral in the DavaoGold Placer of Mindanao Islands, Philippines andIts Prospecting significance |
| 投稿时间：2011-06-10 修订日期：2011-07-22 |
| DOI： |
| 中文关键词: 菲律宾达沃砂金矿金汞矿物矿物学研究找矿意义 |
| 英文关键词: Gold-mercury Mineral, Mineralogical Characteristics, Prospecting significance, Davao gold placer, Philippines |
| 基金项目:本文由中国黄金国际资源有限公司资助 |
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| 中文摘要: |
| [摘要]本文系统研究了菲律宾棉兰老岛达沃砂金矿的矿物组合、金汞矿物的矿物学特征,认为随着金汞矿物中汞含量成分增加,金-汞系列矿物反射力具有由强-弱-强的变化特征,同时矿物硬度也随着减少。但是,当汞含量增加到相当比例时,尤其是晶体结构为等轴晶系时,其硬度却逐渐变大。笔者研究发现,金汞齐和r-汞金矿只是作为自然金或含汞自然金的矿物镶边而存在。总体上,汞的含量从金粒边缘向中心是逐渐减少的,但金粒边缘比中间低。结合成矿地质背景分析,笔者认为菲律宾应该有可能存在伴随超基性-基性岩浆活动形成的铂、铬等幔源矿床,也极有可能发现大型或特大型金、汞和多金属矿床,以及金、铂等滨海砂矿床。 |
| 英文摘要: |
| Abstract:Mineral assemblage and mineralogical characteristics of gold-mercury minerals in the Davao Placer of Mindanao Islands, Philippines were systematically studied in this paper. Results show that, with the increasing mercury content in gold-mercury minerals, their reflecting power exhibits variations in the sequence of strong ? weak ? strong, in contrast to the decrease of mineral hardness. However, when the content of mercury reaches a definite proportion, especially when the crystal displays isometric crystal texture, its hardness increases. We also find that goldmalgam and r-goldmalgamite just occur as natural edge of gold-mercury mineral grains. Overall, mercury content gradually reduces from the edge to the centre of gold-mercury mineral particles, but that in the edge of grains is lower than that in the middle. With a combination of the analysis of metallogenetic background, this paper suggests that there are mantle-derived platinum and chromium deposits in the region, which are accompanied by ultramafic-mafic magmatism, and large and ultra-large scale gold, mercury-polymetallic deposits, as well as coastal placer of gold and platinum are also likely. |
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