 | | Journal (article/letter/editorial) | | Skarns in the Riba de Alva Mine, Northeastern Portugal L. MIGUEL GASPAR† Departamento de Geologia, Faculdade...Faculdade de Ciências, Universidade de Lisboa, Bloco C2, Campo Grande, 1700 Lisboa, Portugal AND CARLOS...Lisboa, Portugal Abstract The metasediment-hosted distal scheelite skarns from the Riba de Alva mine, Barca...Barca de Alva-Escalhão region, northeastern Portugal, consist of three main levels of strata-bound, boudin-shaped...having a low pistacitic component (5–13% Ps). Plagioclase compositions grade from anorthite in pyroxene |  | Köhler, Martin, Hanelli, Delira, Schaefer, Stefan, Barth, Andreas, Knobloch, Andreas, Hielscher, Peggy, Cardoso-Fernandes, Joana, Lima, Alexandre, Teodoro, Ana C. (2021) Lithium Potential Mapping Using Artificial Neural Networks: A Case Study from Central Portugal. Minerals, 11 (10) 1046 doi:10.3390/min11101046 | Journal (article/letter/editorial) | | Artificial Neural Networks: A Case Study from Central Portugal Martin Köhler 1, * , Delira Hanelli 1 , Stefan...Artificial Neural Networks: A Case Study from Central Portugal. Minerals 2021, 11, 1046. https://doi.org/10.3390/min...Sciences, University of Porto, 4169-007 Porto, Portugal; joana.fernandes@fc.up.pt (J.C.-F.); allima@fc... Pole of University of Porto, 4169-007 Porto, Portugal Correspondence: martin.koehler@beak.de Abstract:...1200 km2 in the surroundings of Bajoca Mine (Northeast Portugal). Extensive knowledge about geological |  | | Journal (article/letter/editorial) | | 10 km NW of Khaybar. But occurrences are not of mine-able quality, as the supracrustal rocks of Baha...garnet. Other minerals identified include sodic plagioclase, quartz, actinolite, epidote, aluminian titanite...to be of an ‘‘oxidized’’ type. 3.3. Feldspar Plagioclase is present in all the skarn facies, and is mostly...022 0.481 0.200 0.254 0.018 0.017 grains. Plagioclase is often clouded with fine-sized products of low...other skarn deposits, such as the Riba de Alva W-skarn mine of Portugal (Gaspar and Inverno, 2000), where |  | Alaminia, Zohreh, Mehrabi, Behzad, Razavi, Seyed Mohammad Hossein, Tecce, Francesca (2020) Mineral chemistry, petrogenesis and evolution of the Ghorveh-Seranjic skarn, Northern Sanandaj Sirjan Zone, Iran. Mineralogy and Petrology, 114 (1) 15-38 doi:10.1007/s00710-019-00688-6 | Journal (article/letter/editorial) | | andalusite+cordierite+biotite+muscovite+K-feldspar+plagioclase occurred at low pressure (< 2 kbar) and at a...fine-grained crystals of clinopyroxene, garnet, plagioclase in hand sample of typical endoskarn zone; e...garnet, Ves = vesuvianite, Qz = quartz, Pl = plagioclase epidote and amphibole and 1 μm for clinopyroxene...composed of prograde minerals (e.g. clinopyroxene, plagioclase and garnet), retrograde minerals (e.g. epidote...particularly plagioclase, and its abundance increases toward the exoskarn zone. Plagioclase crystals are |  | | Journal (article/letter/editorial) | | silicates in a W-(Sn) skarn close to Felbertal tungsten mine, Eastern Alps Alexander Ordosch 1,2 & Johann G...It is composed of major clinozoisite, quartz, plagioclase and scheelite with minor and accessory titanite...AG (WBH AG), the company operating the Felbertal mine, decided to re-explore scheelite showings at Messelingscharte...further to the north (e.g., at the Felbertal scheelite mine) its base is formed by the Basal Schist. There,...silicates in a W-(Sn) skarn close to Felbertal tungsten mine, Eastern... Kaprun Mittersill Vienna Uttendorf |  | Shabeer, K. P., Okudaira, T., Satish-Kumar, M., Binu-Lal, S. S., Hayasaka, Y. (2003) Ca-W metasomatism in high-grade matapelites: an example from scheelite mineralization in Kerala Khondalite Belt, southern India. Mineralogical Magazine, 67 (3) 465-483 doi:10.1180/0026461036730111 | Journal (article/letter/editorial) | | in the granoblastic matrix (quartz + garnet + plagioclase + apatite) or in strings parallel to relict foliation...biotite akes within a quartzo-feldspathic matrix de ne the foliation in unmigmatized portions. The mineralized...mineralized domain is rich in medium-grained plagioclase feldspar, garnet (fresh and free of mineral inclusions)...along with the subordinate oxide phases and plagioclase. Perthitic feldspars are also observed in the...minerals seen along the mineralized zone are plagioclase, garnet and quartz together with apatite and |  | Tornos, F., Galindo, C., Crespo, J. L., Spiro, B. F. (2008) GEOCHEMISTRY AND ORIGIN OF CALCIC TUNGSTEN-BEARING SKARNS, LOS SANTOS, CENTRAL IBERIAN ZONE, SPAIN. The Canadian Mineralogist, 46 (1) 87-109 doi:10.3749/canmin.46.1.87 | Journal (article/letter/editorial) | | y Minero de España, c/Azafranal 48, E–37001 Salamanca, Spain Carmen GALINDO Departmento de Petrología...Petrología y Geoquímica, Universidad Complutense de Madrid, E–28040 Madrid, Spain José Luis CRESPO SIEMCALSA...7119–0.7128; Nd300Ma between –8.5 and –8.7) and plagioclase-rich skarn (87Sr/86Sr in the range 0.7124–0.7129;...System, Los Santos deposit, Spain. Sommaire La skarn de Los Santos, mésozonale, calcique et réductrice, affleurant...la Zone Ibérique Centrale, constitue un gisement de tungstène à tonnage limité mais à teneur élevée se |  | Song, Shiwei, Mao, Jingwen, Xie, Guiqing, Yao, Zaiyu, Chen, Guohua, Rao, Jianfeng, Ouyang, Yongpeng (2018) The formation of the world-class Zhuxi scheelite skarn deposit: Implications from the petrogenesis of scheelite-bearing anorthosite. Lithos, 312. 153-170 doi:10.1016/j.lithos.2018.05.002 | Journal (article/letter/editorial) | | China. The anorthosite mainly comprises An-rich plagioclase (Anavg=91, ~90 vol.%) + scheelite (~3 vol.%)...large-scale MA tungsten mineralization in the Zhuxi mine. Keywords: Scheelite-bearing anorthosite; Petrogenesis;...the abundant tungsten mineralization in the Zhuxi mine are not well understood. Notably, a quartz-free...comprises An-rich (An=84.5–99.7, average=91) plagioclase (~90 vol.%)+ scheelite (~3 vol.%) + apatite (~2...the major and trace element characteristics of plagioclase, apatite, NU titanite, ilmenite, and prehnite |  | | Journal (article/letter/editorial) | | Camiboğazı. The Fe skarn deposit contains an amount of mine waste covering an area of 5000 m2 but has no reserve...currently in production. Thus, the situ- ation of the mine has changed over time, and many parts of it are...porphyric. The typical magmatic minerals are plagioclase (An26–50), biotite (altered to chlorite), and...mineral assemblages of the rocks are K-feldspar, plagioclase (An16–40), quartz, biotite, hornblende, and clinopyroxene...zoning, described and interpreted in garnets from Ocna de Fier skarns (CIOBANU & COOK 2004) and the Southwest |  | Li, Xiao-Yu, Gao, Jian-Feng, Zhang, Rong-Qing, Lu, Jian-Jun, Chen, Wen-Hui, Wu, Jin-Wei (2018) Origin of the Muguayuan veinlet-disseminated tungsten deposit, South China: Constraints from in-situ trace element analyses of scheelite. Ore Geology Reviews, 99. 180-194 doi:10.1016/j.oregeorev.2018.06.005 | Journal (article/letter/editorial) | | Precipitation of early apatite and scheelite, as well as plagioclase decomposition, altered the fluid composition and...greisenization and phyllic alteration, led to plagioclase decomposition, which provided the Ca necessary...quartz (30–40 vol %), K-feldspar (30–40 vol%), plagioclase (20–30 vol%; An = 30–40), and minor biotite (<...common. Albite occurs as overgrowth rims on plagioclase, or within K-feldspar forming a perthitic texture...K-feldspar includes the earlier plagioclase and biotite; albite replaced the plagioclase as overgrowth and K-feldspar |  | | Journal (article/letter/editorial) | | 1992; Large et al., 2001; Allen and Weihed, 2002; De Ronde et al., 2005; Stoffers et al., 2006; Bradshaw...phenocrysts of the Biesisala porphyry include plagioclase, microcline and quartz, whereas the matrix is...is phaneritric and is composed of plagioclase, orthoclase, quartz, biotite and minor hornblende. The accessory...calderas (Stoffers et al., 2006) or volcanic edifice (de Ronde et al., 2005). Fig. 18 schematically depicts...analysis. Geochimica et Cosmochimica Acta 27, 43–52. De Ronde, C.E.J., Hannington, M.D., Stoffers, P., et |  | Mateus, António, Figueiras, Jorge, Martins, Ivo, Rodrigues, Pedro, Pinto, Filipe (2020) Relative Abundance and Compositional Variation of Silicates, Oxides and Phosphates in the W-Sn-Rich Lodes of the Panasqueira Mine (Portugal): Implications for the Ore-Forming Process. Minerals, 10 (6) 551 doi:10.3390/min10060551 | Journal (article/letter/editorial) | | Phosphates in the W-Sn-Rich Lodes of the Panasqueira Mine (Portugal): Implications for the Ore-Forming Process...4 * and Departamento de Geologia, Faculdade de Ciências da Universidade de Lisboa, Ed. C6, Piso 4,... Campo Grande, 1749-016 Lisboa, Portugal; jfigueiras@fc.ul.pt (J.F.); pcrodrigues@fc.ul.pt (P.C.R.) Instituto...Faculdade de Ciências da Universidade de Lisboa, Ed. C1, Piso 0, Campo Grande, 1749-016 Lisboa, Portugal; ijmartins@fc...6225-051 Barroca Grande, Portugal; filipe.pinto@beraltportugal.pt Instituto de Ciências da Terra (ICT) |  | Zhang, Weifeng, Chen, Huayong, Peng, Lianhong, Zhao, Liandang, Lu, Wanjian, Zhang, Zengjie, Yang, Juntao, Sun, Jie (2018) Ore genesis of the Duotoushan Fe-Cu deposit, Eastern Tianshan, NW China: Constraints from ore geology, mineral geochemistry, fluid inclusion and stable isotopes. Ore Geology Reviews, 100. 401-421 doi:10.1016/j.oregeorev.2017.02.021 | Journal (article/letter/editorial) | | porphyry, mainly consisting of quartz (38%), plagioclase (46%), K-feldspar (5%), biotite (5%), hornblende...representative pyrite samples collected from underground mine workings and drill cores. Pyrite was hand-picked...identified in many skarn deposits (e.g., Empire Cu-Zn Mine, Chang and Meinert, 2008; Coroccohuayco deposit...Chang, Z.S., Meinert, L.D., 2008. The Empire Cu-Zn Mine, Idaho: exploration implications of unusual skarn...strata-bound scheelite skarns in the Riba de Alva mine, northeastern Portugal. Econ. Geol. 95, 1259‒1275. Hanley |  | | Journal (article/letter/editorial) | | biotite granite, consisting of quartz (27.3%), plagioclase (36.5%), alkali feldspar (25.7%), biotite (9...predominantly consists of quartz, K-feldspar, plagioclase, biotite, hornblende, and magnetite. Alkali feldspar...feldspar has perthitic texture and plagioclase was partly sericitized. Several sets of acidic dikes also...stratabound scheelite skarns in the Riba de Alva Mine, Northeastern Portugal. Econ. Geol. 95, 1259–1275. Harlov...C., 2012. Skarn gold mineralization at the Geodo mine, South Korea. Econ. Geol. 107, 537–551. Kim, E.J |  | | Book | | approximately 5 cm taii and is from the Eagle's Nest mine, Piacer County, California. Ross Beaty Collection...parties de ses publicatJOnS pour let..- usage interne au person,el. ou rosage inteme ou personnel de cllenls...obtenu prealablemt.'fll une ltcanca it eel effet de CANCOPY (Canadian Copyright LJcenstng Agency), One...reprodudion pour fins de cistrhrtion ~ . de publicite ou de promotion, pcl.lr la confed.10n de nouveaux travaux...c:oleciifs ou par la revede cette nature, on doit au prealable convenir d'en-tentes |  | | Journal (article/letter/editorial) | | Akaganeite Alabandite Albite (Na end member plagioclase) Alexandrite Allanite-(Ce) orthite Allargentum...Ankerite Annabergite Anorthite (Ca end member plagioclase) Anothoclase Anthophyllite Antimonselite Antimony...Q–A–P–F diagram (quartz, alkaline feldspar, plagioclase, and foid) designed by Streckeisen (1976) allows...hanging wall. During a subsequent mining period, the mine was re-opened to recover sideritic parts of the...rock consisting mainly of amphibole and little plagioclase with little or no quartz. Dark fine-gr. Extrusive | | | Journal (article/letter/editorial) | | Akaganeite Alabandite Albite (Na end member plagioclase) Alexandrite Allanite-(Ce) orthite Allargentum...Ankerite Annabergite Anorthite (Ca end member plagioclase) Anothoclase Anthophyllite Antimonselite Antimony...Q–A–P–F diagram (quartz, alkaline feldspar, plagioclase, and foid) designed by Streckeisen (1976) allows...hanging wall. During a subsequent mining period, the mine was re-opened to recover sideritic parts of the...rock consisting mainly of amphibole and little plagioclase with little or no quartz. Dark fine-gr. Extrusive |
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