 | | 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...skarn with clinozoisite + scheelite + fluorite + calcite ± labradorite ± apatite ± Fe axinite ± armenite |  | 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 |  | 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) | | stage I, clinopyroxene+garnet±vesuvianite±quartz±calcite±scheelite± pyrrhotite; stage II, garnet+ clinopyroxene...patite+calcite±pyrrhotite; stage III, amphibole+vesuvianite+epidote+chlorite±quartz ±calcite±pyrrhot...±calcite±pyrrhotite±pyrite±chalcopyrite and stage IV, quartz+calcite±amphibole±epidote±chlorite±pyrite±chalcopyrite....assemblages of regional metamorphism consist of calcite± clinopyroxene± tremolite± epidote ± albite± opaque±... vesuvianite, amphibole, epidote, quartz, and calcite together with scheelite, chlorite, titanite, pyrrhotite |  | | Journal (article/letter/editorial) | | and retrograde (epidote, quartz, hornblende, calcite) assemblages. The pyroxenes are ferrosalites, Mn-bearing...wollastonite, vesuvianite, epidote, diopside, calcite, amphibole and scheelite. This assemblage argues...10 km NW of Khaybar. But occurrences are not of mine-able quality, as the supracrustal rocks of Baha...other skarn deposits, such as the Riba de Alva W-skarn mine of Portugal (Gaspar and Inverno, 2000), where...1978. Skarn a idocrase, grossulaire et scheelite de Plougoulm (Finistere, France). Bull. Min. 101, 576–577 |  | | Journal (article/letter/editorial) | | 3053, Australia BULLETIN DE LA SOCIETE GEOLOGIQUE DE FRANCE Société Géologique de France, 77, rue Claude-Bernard...Verlag Jena, PF 10537, D 07705 Jena, Germany CHRONIQUE DE LA RECHERCHE MINIERE Editions du BRGM, B.P, 6009...Serviços Geológicos de Portugal, Rua da Academia das Ciências, 19-2°, 1200 Lisbon, Portugal CONTRIBUTIONS...Tokyo, 107 Japan REVISTA GEOLOGICA DE CHILE Servicio Nacional de Geología y Minería, Avenida Santa Maria...SCIENCES GEOLOGIQUES Institut de Géologie, Université Louis Pasteur de Strasbourg, 1, rue Blessig, F-67084 |  | | Journal (article/letter/editorial) | | silicates in a W-(Sn) skarn close to Felbertal tungsten mine, Eastern Alps Alexander Ordosch 1,2 & Johann G...and scheelite with minor and accessory titanite, calcite and chlorite. Bulk chemical analyses reveal high...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 |  | 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...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...valeurs de d18O du grenat et du clinopyroxène dans la skarn prograde indiqueraient des valeurs d18O de la |  | 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) | | biotite akes within a quartzo-feldspathic matrix de ne the foliation in unmigmatized portions. The mineralized...feldspars and quartz. No traces or inclusions of calcite or any other carbonate minerals are noticed either...Inclusions in Minerals: Methods and Applications (B. De Vivo and M.L. Frezzotti, editors). Virginia Polytechnic...evolution of distal skarns in the Riba de Alva mine, northeastern Portugal. Economic Geology, 95, 1259 –...skarns of the Sierra Nevada. I. The Pine Creek mine, California. Economic Geology, 77, 823 – 844. Ravindra |  | | Journal (article/letter/editorial) | | of the gypsum (anhydrite) has been replaced by calcite–pyrite assemblages (Jiang et al., 2011), suggesting...strata-bound scheelite skarns in the Riba de Alva Mine, Northeastern Portugal. Econ. Geol. 95, 1259–1275. Gize |  | | 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...volcanics are generally altered to epidote, sericite, calcite, and chlorite. Fig. 2. Geological map (SIPAHI...Camiboğazı Banded sample including talc-quartz-calcite between garnet bands and hematite in garnet Magnetite-quartz...for the Fe skarn. A. Banded texture: Talc-quartz-calcite assemblages (grey) between garnet (light brown) |  | 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) | | the magnetite ore, followed by later quartz / calcite / hematite veinlets. Based on fluid inclusions...albite, epidote, chlorite, quartz, titanite and calcite being the nonmetallic minerals. Ore-forming...hydrothermal veins (containing mostly quartz and calcite) are abundant at Duotoushan, but their crosscutting...are ambiguous. Fine-grained subhedral quartz, calcite and hematite formed narrow veins, cutting stage...measurements. FIs are well preserved in late veins stage calcite, and partially distribute in garnet. Microthermometric |  | 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) | | sericite veinlet mineralization. Sulfide and quartz + calcite ± pyrite veinlets formed during the post-ore stage...sulfide (pyrite ± galena ± sphalerite) and quartz + calcite ± pyrite veinlets developed during the post-mineralization...crosscut by late quartz + calcite ± pyrite veinlets (Fig. 4d). Quartz + calcite ± pyrite veinlets develop...II veinlet cuts Stage I veinlet. (d): Quartz + calcite ± pyrite veinlet cuts Stage I veinlet and sulfide...pipe-style mineralisation at the Zaaiplaats tin mine. Econ. Geol. 86, 121–141. Pollard, P.J., 1983. Magmatic |  | | 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) | | 1992; Large et al., 2001; Allen and Weihed, 2002; De Ronde et al., 2005; Stoffers et al., 2006; Bradshaw...Ca2 +-rich and Mn2 +-poor, hairy hornblende and calcite, with a notable absence of biotite (Fig. 7A). Chalcopyrite...+ in Fig. 13 and are, therefore, considered as calcite. The carbonates of SW82 (Group 2) are characterized...presence of rhodochrosite and siderite, as well as calcite. Rhodochrosite and siderite have supplied Mn and...garnet and pinkish sphalerite; (D) a veinlet of calcite, quartz, and sphalerite along the boundary of garnet–biotite |  | | Journal (article/letter/editorial) | | Ogbang W) (Park et al., 1988) and ⁎ high-grade calcite deposits (Fig. 1). Although most of the deposits...Geology has attracted attention. In a nearby Seojin calcite deposit, W and Pb-Zn mineralizations were also...comprises massive pure limestone, and high-grade calcite ore is developed in its upper part. The Hwajeol...pyroxene zone, (e) Calcite vein in the marble. Abbreviations: Cp = Chalcopyrite, Cc = calcite, Qtz = quartz...Seojin deposit is undergoing mining for high-grade calcite of the Pungcheon Formation, but the W skarn is |  | 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) | | 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...cross-cut the NE–SW-trending faults. In the Zhuxi mine, as shown in Fig. 3, orebody is not found at the...al., 2005), and the release of H+ will enhance calcite dissolution; thus, the 20 ACCEPTED MANUSCRIPT...Strata-Bound Scheelite Skarns in the Riba de Alva Mine, Northeastern Portugal. Economic Geology 95, 1259-1275 |  | | Journal (article/letter/editorial) | | Brüggenite Brunckite Brushite Bustamite Calaverite Calcite Cancrinite Canfieldite Carbocernaite Carlinite Carnallite...hanging wall. During a subsequent mining period, the mine was re-opened to recover sideritic parts of the...biotite, calcite, zircon, aegirite, pyrochlore and apatite. Duricrusts containing chiefly calcite. A metamorphic...minerals include hornblende, biotite, chlorite, and calcite. This diabasic texture is also termed interstitial...The accessory minerals are apatite, cancrinite, calcite, titanite and melanite–garnet. It is the plutonic | | | Journal (article/letter/editorial) | | Brüggenite Brunckite Brushite Bustamite Calaverite Calcite Cancrinite Canfieldite Carbocernaite Carlinite Carnallite...hanging wall. During a subsequent mining period, the mine was re-opened to recover sideritic parts of the...biotite, calcite, zircon, aegirite, pyrochlore and apatite. Duricrusts containing chiefly calcite. A metamorphic...minerals include hornblende, biotite, chlorite, and calcite. This diabasic texture is also termed interstitial...The accessory minerals are apatite, cancrinite, calcite, titanite and melanite–garnet. It is the plutonic |
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