Geochemical Characteristics and Genesis of the Zhuoma Lead-Zinc Deposit in Yunnan Province
详细信息   
摘要


     The Zhuoma lead-zinc deposit is located in the southern segment of the Indosinian Yidun-Zhongdian island-arc belt. The ore body occurs in the Indosinian quartz monzonite porphyry and is controlled by faulted zones. Studies of REE of non-ore porphyry family: 宋体; mso-ascii-font-family: calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: calibri; mso-hansi-theme-font: minor-latin">porphyritefamily: 宋体; mso-ascii-font-family: calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: calibri; mso-hansi-theme-font: minor-latin">, fragmentation-porphyry ore, vein ore and sulfur and lead isotopes of ore galena show that RASE geochemical characteristics of porphyry family: 宋体; mso-ascii-font-family: calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: calibri; mso-hansi-theme-font: minor-latin">porphyritefamily: 宋体; mso-ascii-font-family: calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: calibri; mso-hansi-theme-font: minor-latin"> and ores are similar to each other, and ores and porphyry family: 宋体; mso-ascii-font-family: calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: calibri; mso-hansi-theme-font: minor-latin">porphyritefamily: 宋体; mso-ascii-font-family: calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: calibri; mso-hansi-theme-font: minor-latin"> were from the same source. Galena δ 34S values range from-0.01 to-2.90‰, indicating that sulfur was derived from the mantle, lead isotopic ratios of ^206Pb/^204Pb vary from 18.0959 to 18.1119, ^207pb/^204pb from 15.6118 to 15.6191, and ^208Pb/^204Pb from 38.2515 to 38.2918, suggesting that lead of ores was derived from an orogenic environment, with the source area belonging to mixed crust-mantle source dominated by mantle lead. Lead-zinc mineralization in the ore district was closely related to the late Indosinian Zhuoma duplex porphyry family: 宋体; mso-ascii-font-family: calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: calibri; mso-hansi-theme-font: minor-latin">porphyritefamily: 宋体; mso-ascii-font-family: calibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: calibri; mso-hansi-theme-font: minor-latin">, and the ore deposit belongs to magmatic hydrothermal filling metasomatic type controlled by fractures.

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