Mineralogical Characteristics of Skarn in Tuosibasitao Iron-Copper-Gold Deposits of the Northern Margin of Junggar, Xinjiang, and Their Geological Significance
详细信息
- 责任者：Lü Shujun (No.407 Team ; Bureau of Geology and Mineral Exploration and Development of Hunan Province ; Huaihua 418000 ; China) ; Yang Fuquan
- 刊名：Rock and Mineral Analysis
- 出版年：2013
- 卷期：32(3)
- 关键词：铁矿 ; iron ores ; 铜矿 ; copper ores ; 金矿 ; gold ores ; 磁铁矿 ; magnetite ; 准噶尔盆地 ; Junggar Basin
- 页码：p.510-521
- 图表：illus., 5 tables, 46 refs.
- 分类号：1001
- issnNo：ISSN0254-5357
- isbnNo：CN11-2131/TD
摘要
The Tuosibasitao Fe-Cu-Au mineral deposit mainly occurs in the contact zone between the diorite porphyrite and basaltic volcanic rock of Middle Devonian Beitashan Formation in the forms of massives,heterogeneous gobbets,veinlets,breccia and veinlet-disseminated.The ore bodies in the ore deposit occur as stratoids or lenses,surrounded by skarn.The major and trace elements in magnetite,and chemical components in garnet,chinopyoxene and epidote from Tuosibasitao deposit were studied by Inductively Coupled Plasma-Mass Spectrometry(ICP-MS) and Electron microprobe analyse.The results demonstrate that the end member of garnet is mainly grossularite and andradite.The composition of pyroxene was mainly diopside,with a small amount of augite.The epidote was enriched in Fe and Ca.The composition of these skarn minerals suggest that skarn in Tuosibasitao ore deposit is calcic skarn.In combination with the geological characteristics,it is possible that the skarns are formed by hydrothermal interaction with metamorphic volcanic,and the formation of magnetite is related to the retrogressive metamorphism of the skarn.Copper and gold mineralization occurred during the quartz-sulphide-carbonate period.