Petrological characteristics, geochemical feature and metallogenetic relation of alkaline-rich rocks in northwest of Yunan Province, China
Zhang, De-xian, and Dai, Ta-gen (2011) Petrological characteristics, geochemical feature and metallogenetic relation of alkaline-rich rocks in northwest of Yunan Province, China. Journal of Central South University of Technology, 18 (4). pp. 1217-1225.
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The alkali-rich rocks, spreading along the suture zone of Jingsha River, refer to the alkali-rich porphyry rocks, which emplace during the Himalaya epoch in northwest of Yunnan Province, and consist of syenit, syenit porphyry, monzonite porphyry and granite porphyry. Petrological chemical analysis results suggest that silica is poor and aluminum is rich, and high potassium large ion lithophile elements (LILE), light rare earth element (LREE) and Sr are obviously detracted in these rocks. High field strength elements (HFSE) and heavy rare earth element (HREE) are depleted, especially Nb, Ta, P and Ti. δ Eu: 0.09–1.64 shows that plagioclase does not appear fractional crystallization during the formation of alkali-rich rocks. δ 34S, H and O isotopes and Pb isotopes suggest that ore-forming fluid is derived from the mantle, and Pb is possibly mixed by mantle, wall rock and crust. The age of Pb in alkali-rich rocks is about 250–220 Ma. The age of alkali porphyry rock (dykes) varies from 30 Ma to 50 Ma. Alkali rocks have strong metallogenetic relation. Au mineralization is associated to the alkali magmatic activities with a relatively high temperature, low pressure and high oxygen fugacity. However, copper mineralization is mainly associated with alkali-sub-alkali magmatic activities in a process of relatively low temperature, high pressure and lower oxygen fugacity.
|Item Type:||Article (Refereed Research - C1)|
|Keywords:||alkali-rich porphyry rocks; Sanjiang metallogenetic belt; geochemistry; metallogenetic relation|
|FoR Codes:||04 EARTH SCIENCES > 0402 Geochemistry > 040201 Exploration Geochemistry @ 100%|
|SEO Codes:||84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840199 Mineral Exploration not elsewhere classified @ 100%|
|Deposited On:||28 Mar 2012 13:47|
|Last Modified:||09 May 2013 01:46|
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