Mineral Chemistry and U-Pb Garnet Geochronology of Strongly Reduced Tungsten Skarns at the Pampa de Olaen Mining district, Cordoba, Argentina
文献类型：期刊论文
| 作者 | Espeche, Maria Jose2,3; Wan, Bo4; Lira, Raul2,3; Seltmann, Reimar1 |
| 刊名 | ORE GEOLOGY REVIEWS
 |
| 出版日期 | 2021-11-01 |
| 卷号 | 138页码:25 |
| 关键词 | Garnet U-Pb age U-Pb geochronology Garnet/pyroxene chemistry Scheelite skarn Achalian magmatism Cordoba Ranges |
| ISSN号 | 0169-1368 |
| DOI | 10.1016/j.oregeorev.2021.104379 |
| 英文摘要 | Los Guindos scheelite (+/- Zn, Bi, Sn, Ag) skarn presents mineral assemblages and a mineral chemistry similar to other worldwide strongly reduced W skarn deposits. Its reduced nature is defined based on the predominance of subcalcic garnets, Mo-free scheelite and absence of magnetite. Both the prograde and retrograde stages are evident at Los Guindos scheelite skarn. The prograde skarn is characterized by three zones: A zone I of garnet + helvine (Gr(57)Sps(24)Ad(19)Alm(8) - Sps(50)Alm(24)Gr(22)Ad(3); Grt + Hlv); a zone II of clinopyroxene + garnet (Di(67)Hd(24)Jo(9) + Gr(66)Sps(19)Ad(12)Alm(3); Cpx + Grt) and a zone III of garnet + vesuvianite (Gr(73)Ad(22)Sps(3)Alm(2) Gr(58)Sps(22)Ad(10)Alm(9); Grt + Ves). Retrograde skarn is mainly represented by epidote - actinolite and minor F-rich actinolite (0.663 apfu of F) - potassium feldspar - chlorite (chamosite/clinochlore: 50/50) - muscovite - calcite - quartz. A hydrothermal stage developed in temporal continuity with retrograde skarn formed variable infilling associations of the following species: epidote - actinolite - scheelite - fluorite - calcite - quartz - sphalerite and chlorite. Scheelite mineralization process was triggered by an increase of Ca released during retrograde skarn replacements and was deposited during the following hydrothermal infilling stage. Other than sphalerite, minor bismuthinite and tetradymite, andorite, lillianite, gustavite, matildite and ke center dot sterite occur as hydrothermal associations after scheelite deposition. Scheelite-free reaction skarn preceding scheelite skarns was observed. Geobarometric calculations in this reaction skarn suggests an initial confining pressure of 2.5 kbar for the Los Guindos scheelite skarns. This pressure matches the estimated emplacement pressure of the DevonianCarboniferous Achala batholith reported by previous authors. Geochemical correlation analyses suggest that this magmatism may have contributed mineralizing fluids channeled through regional structures and lithological contacts, causing infiltration metasomatism that originated scheelite (+/- Zn, Bi, Sn, Ag) mineralization in Cambrian and Ordovician country rocks. U-Pb analyses (LA-ICP-MS) of garnet in the Los Guindos scheelite skarn gave an age of 361 +/- 11 Ma representing the age of the prograde stage of scheelite skarns and it should be framed within the Devonian-Carboniferous Metallogenic Epoch. |
| WOS关键词 | ACHALA BATHOLITH ; FLUID INCLUSION ; DEPOSITS ; GEOLOGY ; NOMENCLATURE ; METALLOGENY ; EVOLUTION ; PROVINCE ; SIERRA ; ZN |
| 资助项目 | Chinese Academy of Sciences[132744KYSB20190039] ; Chinese Academy of Sciences[GJHZ1776] ; Secretaria de Ciencia y Tecnologia de la Universidad Nacional de Cordoba, Argentina[411/18] ; Secretaria de Ciencia y Tecnologia de la Universidad Nacional de Cordoba, Argentina[99/19] |
| WOS研究方向 | Geology ; Mineralogy ; Mining & Mineral Processing |
| 语种 | 英语 |
| WOS记录号 | WOS:000701965400001 |
| 出版者 | ELSEVIER |
| 资助机构 | Chinese Academy of Sciences ; Chinese Academy of Sciences ; Secretaria de Ciencia y Tecnologia de la Universidad Nacional de Cordoba, Argentina ; Secretaria de Ciencia y Tecnologia de la Universidad Nacional de Cordoba, Argentina ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Secretaria de Ciencia y Tecnologia de la Universidad Nacional de Cordoba, Argentina ; Secretaria de Ciencia y Tecnologia de la Universidad Nacional de Cordoba, Argentina ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Secretaria de Ciencia y Tecnologia de la Universidad Nacional de Cordoba, Argentina ; Secretaria de Ciencia y Tecnologia de la Universidad Nacional de Cordoba, Argentina ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Secretaria de Ciencia y Tecnologia de la Universidad Nacional de Cordoba, Argentina ; Secretaria de Ciencia y Tecnologia de la Universidad Nacional de Cordoba, Argentina |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/102748]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Espeche, Maria Jose |
| 作者单位 | 1.Nat Hist Museum, Dept Earth Sci, Ctr Russian & Cent Eurasian Mineral Studies, London, England 2.Univ Nacl Cordoba, Fac Ciencias Exactas Fis & Nat, Museo Mineral Geol Dr Alfred W Stelzner, Lab Microscopia Opt & Microtermometr, Av Velez Sarsfield 299,X5000JJC, Cordoba, Argentina 3.Consejo Nacl Invest Cient & Tecn CONICET, Cordoba, Argentina 4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Espeche, Maria Jose,Wan, Bo,Lira, Raul,et al. Mineral Chemistry and U-Pb Garnet Geochronology of Strongly Reduced Tungsten Skarns at the Pampa de Olaen Mining district, Cordoba, Argentina[J]. ORE GEOLOGY REVIEWS,2021,138:25. |
| APA | Espeche, Maria Jose,Wan, Bo,Lira, Raul,&Seltmann, Reimar.(2021).Mineral Chemistry and U-Pb Garnet Geochronology of Strongly Reduced Tungsten Skarns at the Pampa de Olaen Mining district, Cordoba, Argentina.ORE GEOLOGY REVIEWS,138,25. |
| MLA | Espeche, Maria Jose,et al."Mineral Chemistry and U-Pb Garnet Geochronology of Strongly Reduced Tungsten Skarns at the Pampa de Olaen Mining district, Cordoba, Argentina".ORE GEOLOGY REVIEWS 138(2021):25. |
入库方式： OAI收割
来源：地质与地球物理研究所
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