 | | Journal (article/letter/editorial) | | Skarns in the Riba de Alva Mine, Northeastern Portugal L. MIGUEL GASPAR†Departamento de Geologia, Faculdade...Faculdade de CiĂŞncias, 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-EscalhĂŁo region, northeastern Portugal, consist of three main levels of strata-bound, boudin-shaped...present, is restricted to the ore skarn type. The Riba de Alva skarns were formed, after intrusion of the Hercynian |  | | Journal (article/letter/editorial) | | 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...rocks. Such titanite (grothite) also occurs at limestone contact zones of SW Finland and SW Sweden, and...1978. Skarn a idocrase, grossulaire et scheelite de Plougoulm (Finistere, France). Bull. Min. 101, 576–577...Idsas-Wadi Jifr region (Sheet 117, Zone II). French Bureau de Recherches Geologiques et Minieres Technical Record |  | 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) | | comprises of layers of dark gray metamorphic limestone (0.1 to 5 m) containing organic material and black...massive, kilometer-thick cream-colored metamorphic limestone unit (Figs. 1b). The regional metamorphic complex...similar to those reported in amphiboles from Riba de Alva (Gasper and Inverno 2000) and Cantung E-zone...1978); Alaskan W skarns (Newberry et al. 1997); Riba de Alva scheelite skarn (Gaspar and Inverno 2000); d)...garnet compositions are not a simple Cambrian limestone Cretaceous granitoid (inferred) Via fracture |  | | Journal (article/letter/editorial) | | micritic, microspar, and calcsilicate mineral-rich limestone unit. The lower dolomite-dominated unit of the...composed of micrite limestone, microspar limestone and calcsilicate mineral-rich limestone. The Chuanshan...medium-bedded bioclastic and microspar algal limestone. The exposed Middle Permian sedimentary rocks...dominated by dark grey mediumthickness bituminous limestone. The Upper Qixia Formation contains dark grey...grey medium-thickness microspar and bioclastic limestone with chert. The Lower Gufeng Formation is made up |  | 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 PetrologĂa...PetrologĂa y GeoquĂmica, Universidad Complutense de Madrid, E–28040 Madrid, Spain JosĂ© Luis CRESPO SIEMCALSA...System, Los Santos deposit, Spain. Sommaire La skarn de Los Santos, mĂ©sozonale, calcique et rĂ©ductrice, affleurant...la Zone IbĂ©rique Centrale, constitue un gisement de tungstène Ă tonnage limitĂ© mais Ă teneur Ă©levĂ©e se...valeurs de d18O du grenat et du clinopyroxène dans la skarn prograde indiqueraient des valeurs d18O de la |  | | Journal (article/letter/editorial) | | rocks comprised of limestone and the skarn occurrence at CamiboÄźazı dolomitic limestone, adjacent to the...CamiboÄźazı. The Fe skarn deposit contains an amount of mine waste covering an area of 5000 m2 but has no reserve...different places within low-grade metamorphic limestone using the open cut method and has existed since...currently in production. Thus, the situ- ation of the mine has changed over time, and many parts of it are...Cretaceous volcanosedimentary series (including sandy limestone). Mineralogical studies indicate that there are |  | 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) | | residual magma (fluid) was contaminated by pure limestone in a reducing PT environment. RI The formation...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...residual granitic magma is contaminated by pure limestone. Therefore, the formation of the scheelite-bearing |  | | Journal (article/letter/editorial) | | comprises conglomerate, sandstone, shale, and limestone. In the southern part of the study area, the Imog...Pungchon Formation mainly comprises massive pure limestone, and high-grade calcite ore is developed in its...comprises mostly shale in the lower part, and limestone and shale in the upper part. The Dongjeom Formation...characterized by the frequent alternation of dark gray limestone and greenish gray shale. The latter is calcareous...Formation mostly comprises carbonates, including limestone and dolostone, and a small amount of sandstone |  | | 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) | | hanging wall. During a subsequent mining period, the mine was re-opened to recover sideritic parts of the...metamorphic rock resulting from the metamorphism of limestone and composed mainly of calcite. An extrusive rock...Larvikite Laterite Latite Leptite Lherzolite Lignite Limestone Lujavrite Mangerite Marble Melilitite Melteigite...constituent. E Speleothem Speleothem in caves mainly in limestone or dolostone. H Syenite Syenite is a coarse-grained...you look for a mine look near a mine”. This includes the imperative “if you look for a mine look for smelting | | | Journal (article/letter/editorial) | | hanging wall. During a subsequent mining period, the mine was re-opened to recover sideritic parts of the...metamorphic rock resulting from the metamorphism of limestone and composed mainly of calcite. An extrusive rock...Larvikite Laterite Latite Leptite Lherzolite Lignite Limestone Lujavrite Mangerite Marble Melilitite Melteigite...constituent. E Speleothem Speleothem in caves mainly in limestone or dolostone. H Syenite Syenite is a coarse-grained...you look for a mine look near a mine”. This includes the imperative “if you look for a mine look for smelting |
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