Title: GEOLOGICAL CHARACTERISTICS OF THE LARGE FE-CU-AU CONCENTRATION AREA IN MIDDLE-EAST LAOS AND ITS REFERENCE SIGNIFICANCE FOR AU-PROSPECTING IN THREE-RIVER REGION OF YUNNAN
Abstract: The large Fe-Cu-Au concentration area in middle-east Laos is distributed along the SW margin of Xieng Khouang-Changshan fold belt with NW trending and in the tectonic setting of matching and suturing landmasses. This paper is to study the metallogenesis related to Indosinian-Yanshanian-Himalayan granitoid magmatic activity, which has formed a lot of Sn-Fe-Cu-Au deposits, including large and superlarge porphyry, skarn and hydrothermal ore deposits. These ore deposits are formed by the same major geological action and in similar times. And the metallogenesis is closely related to the intrusive rocks in time, space and genesis. The magnetite skarn deposits with high-grade ore are formed mainly in the large-scale intrusion stage of Indosinian-Yanshanian granites. The skarn and porphyry Cu-Au deposits are formed by the deuteric autometasomatism in hypabyssal-superhypabyssal intrusion stage of granitic magma evolution. And the postmagmatic hydrothermal Cu-Au deposits are the end products. The discussion in this paper is focused on the metallogenetic tectonic setting, magmatic evolution, metal source and its concentration mechanism, which have an important reference significance for Au-prospecting in three-river area of Yunnan.
Publication Year: 2004
Publication Date: 2004-01-01
Language: en
Type: article
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Cited By Count: 2
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