 | | Journal (article/letter/editorial) | | reaction zones are cut by calcite ± serpentine veins, which are most abundant in the outer, red zones...outer red zones, where iron is reprecipitated in goethite intermixed with silicates due to higher f O2 ...Qahlah, Simsina and Jafnayn formations [35]. The carbonate cover is particularly extensive in the southeastern...millimetreto centimetre-scale vugs (cavities in veins terminated with euhedral crystals) indicates that...and form an extensive network of carbonate and serpentine–carbonate veins [30]. 3. Analytical methods Analysed |  | | Journal (article/letter/editorial) | | that voids are integrated in a network of carbonate veins, the formation of which is linked to changing...conjunction with dissolution reactions. Partial carbonate filling of pore spaces indicates that under static...The proposed carbonation mechanism implies that carbonate ACCEPTED MANUSCRIPT precipitation may start...lithosphere calcium carbonate veins and not listvenites are common. These veins form in a temperature...1999; Coogan and Gillis, 2013). The input of carbonate-bearing oceanic crust into subduction zones can |  | | Report (issue) | | its rare-earth-bear ing carbonate rocks. One deposit, the Sulphide Queen carbonate body, is the greatest...Providence Mountains. By 1870 many silver-bearing veins had been discovered and explored on the north slope...Barnwell in 1892, to permit exploration of the gold veins at Vanderbilt, near Barnwell, which lies about 20...north of the highway and in which the Birthday veins are now known, was not found in 1926. In the fall...induced prospectors to search for gold-bearing veins, and in December Fred B. Piehl returned to the Sulphide |  | Nabatian, Ghasem, Ghaderi, Majid, Corfu, Fernando, Neubauer, Franz, Bernroider, Manfred, Prokofiev, Vsevolod, Honarmand, Maryam (2014) Geology, alteration, age, and origin of iron oxide–apatite deposits in Upper Eocene quartz monzonite, Zanjan district, NW Iran. Mineralium Deposita, 49 (2) 217-234 doi:10.1007/s00126-013-0484-1 | Journal (article/letter/editorial) | | mineralization of massive and banded magnetite ores in veins and stockwork associated with minor brecciation...formation of quartz and carbonate veins and sericite, chlorite, epidote, silica, carbonate, and tourmaline alteration;...University of Oslo, P.O. Box 1047, Blindern, 0316 Oslo, Norway F. Neubauer : M. Bernroider Department of Geography...(Figs. 1 and 2). Each deposit consists of multiple veins, each vein usually having less than 1,000 tons of...intrusive rocks and, in minor amounts, also in veins within volcanic rocks. The mineralization comprises |  | | Journal (article/letter/editorial) | | secondary phosphates were formed by weathering of carbonate veins hosted within fracture zones of itabirite and...Apatite hosted within unweathered itabirite and carbonate veins was the source of P to the weathering solutions...Ba were released from sulphides hosted in carbonate veins and Al2O3 from country rocks. The link between...secondary phosphates to hydrothermal breccias and carbonate veins highlights the significance of hydrothermal...average P content below 0.10 wt. %. Hematite and goethite are its main ore minerals and quartz the major |  | Moussa, N., Fouquet, Y., Le Gall, B., Caminiti, A. M., Rolet, J., Bohn, M., Etoubleau, J., Delacourt, C., Jalludin, M. (2012) First evidence of epithermal gold occurrences in the SE Afar Rift, Republic of Djibouti. Mineralium Deposita, 47 (5) 563-576 doi:10.1007/s00126-011-0397-9 | Journal (article/letter/editorial) | | generally occurs as gold–silver bearing chalcedony veins and is associated with felsic volcanism. Eighty...mineralized hydrothermal chalcedony, quartz ± carbonate veins and breccias were studied from ten sites representing...from early Miocene to the present. The most recent veins are controlled by fractures at the edges of grabens...characterized by carbonate chimneys, gypsum, silica cap and quartz ± carbonate veins that are depleted...and Au; (2) shallow banded chalcedony ± adularia veins related to boiling that contain up to 16 ppm Au |  | | Report (issue) | | _______________________________________________ Carbonate rock of Iron Hill___________________________________...___________________-____--_-_-__..__._-_ Quartz veins-_------_------__------------------_-__------Rocks...--_-------------------_---------_-_-------Carbonate veins.-___________________-_-_--_.--__-_____-___...TABLE 1. Niobium content of 11 samples of veins and carbonate rocks, Powderhorn district_____________...mineralized shear zones and carbonate veins.-------_-_-_ 3. Analyses, in percent, of carbonate rock containing rare-earthbearing |  | | Journal (article/letter/editorial) | | the carbonate and accessory minerals and oxidation of magnetite to hematite. Magnetite-carbonate BIF...hydrothermal replacement of chert by carbonate, forms distinctive magnetite-goethite ore with magnetite locally...at depth that show no evidence of hydrothermal carbonate or supergene enrichment. The cherty BIF shows...carbonates with subsequent supergene leaching of the carbonate and by the oxidation of chertfree BIF, in which...voids, and some replacement of chert by secondary goethite is common in the solum. However, the † E-mail |  | | Journal (article/letter/editorial) | | Bedded jaspers of the Ordovician Løkken ophiolite, Norway: seafloor deposition and diagenetic maturation...hematitic chert) in the Ordovician Løkken ophiolite of Norway are closely associated with volcanogenic massive...silica, chalcedony, quartz, carbonate and cryptocrystalline hematite and/or goethite forming botryoidal masses...diameter. Coarser euhedral grains of quartz, carbonate, and hematite are integral parts of these textures...(&) Geological Survey of Norway, Leiv Eirikssons vei 39, 7491 Trondheim, Norway E-mail: tor.grenne@ngu |  | Menzel, Manuel D., Garrido, Carlos J., López Sánchez-Vizcaíno, Vicente, Marchesi, Claudio, Hidas, Károly, Escayola, Monica P., Delgado Huertas, Antonio (2018) Carbonation of mantle peridotite by CO2-rich fluids: the formation of listvenites in the Advocate ophiolite complex (Newfoundland, Canada) Lithos, 323. 238-261 doi:10.1016/j.lithos.2018.06.001 | Journal (article/letter/editorial) | | variably sized tensional veins. The whole rock Fe3+/Fetotal ratio of the Advocate carbonate-bearing sequence...of magnesite and the formation of hematite and goethite, indicating a concomitant increase of the fluid...decarbonation or dissolution of organic carbon- and carbonate-bearing meta-sediments, such as those occurring...metamorphic conditions, they tend to hydrate and carbonate when in contact with aqueous fluids. Oceanic ophicarbonates...ophicarbonates (e.g., Schwarzenbach et al., 2013) and carbonate travertine in peridotite- T hosted alkaline |  | | Journal (article/letter/editorial) | | hematite after magnetite) and poor in limonite and goethite compared to other ore deposits of the Marra Mamba...ore consists of low phosphorous martite-limonite-goethite derived from chert-free BIF by supergene weathering...weathering. No evidence of the complete carbonate replacement of chert has been found at Hope Downs nor were...thick. The magnetite mesobands and iron silicate-carbonate mesobands typically display fine microbanding...other mesobands; mixed bands of silicate and carbonate typically occur between chert and magnetite mesobands |  | | Journal (article/letter/editorial) | | Czechoslovakia; Freiberg and Schneeberg, Germany; Kongsberg, Norway; Bou Azzer, Morocco; and the Consols mine at Broken...pyrite) near the ore-bearing veins. The east-to-nort heast-t rending veins range in thickness from less...1 inch t o over 10 feet near the ore pods. The veins tend t o narrow and become less well defined as...delineated segregations of metallic minerals in veins composed of dolomite and chert. These pods can measure...and 4 inches t o several feet in thickness. The veins commonly contain altered brecciated fragments of |  | | Journal (article/letter/editorial) | | approaching 72 wt% Fe. While their near-surface goethite–hematite ores are unequivocally the product of...in BIF by hypogene carbonate minerals, followed by the dissolution of the carbonate and concentration...fluids. In contrast, the fluids responsible for carbonate alteration at the Matthew Ridge, Koolyanobbing...98 °C) of these fluids led to dissolution of carbonate minerals and concentration of magnetite. Dated...Paleoproterozoic. Later specular hematite-rich veins that cut and modify magnetite ores crystallized |  | | Journal (article/letter/editorial) | | Tulul al Ashaqif area. Calcite, smectites, and goethite occur with parent minerals. Water that is inducing... but the isotopic composition of abundant carbonate veins reveals a deep source, i.e., volcanogenic CO2...el Ghussein is permeated by syn-weathering carbonate veins whereas fresh basalt with pre-Islamic inscriptions...oriented calcitic veins. The calcite ranges from tiny veinlets, a few millimeters thick, to veins that reach...includes randomly oriented carbonate veins up to 5 cm in thickness, a thick carbonate vein separating weathered |  | | Journal (article/letter/editorial) | | Magnetite–apatite mineralization in the Zanjan region occurs as veins, each one usually having around 1000 tonnes of ore...include chlorite, epidote, calcite and some quartz veins. In some cases, andesitic tuff units are in fault...some minor mineralization of magnetite–apatite veins (noneconomic) along the contact of plutonic and...The orebodies are composed of three individual veins of iron oxide–apatite. The orebodies are characterized...There are large clinopyroxene grains around the ore veins (Fig. 4e). The main magnetite–apatite vein in the |  | | Journal (article/letter/editorial) | | minerals have been identified in gold-bearing carbonate veins cutting Middle Devonian limestones of the Torquay...products include cerussite, malachite, aragonite and goethite. The relative abundance of Au, Ag, Hg and Se is...during the Middle to Upper Devonian, extensive carbonate platforms developed within a predominantly marine...limestone at Hope's Nose is cut by a number of calcite veins and stringers in the vicinity of the sewage outfall...50 m to the northeast and southwest of it. The veins are steeply dipping and trend roughly N70~ Some |  | | Journal (article/letter/editorial) | | fractures and occur as continuous and discontinuous veins and masses. Based on mineralogical and geochemical...distinguished (1) carbonate listvenite, (2) silica listvenite and (3) silica–carbonate listvenite. The...listvenites contain a wide range of silicate and carbonate minerals related to different hydrothermal fluid...listvenites are more variable in mineralogy compared to carbonate listvenites and enrichment of metals, such as...three types of listvenites, namely silica and carbonate listvenite and those associated with sulfides |  | | Journal (issue) | | Isle II 16 28 29 .. PLATE V. Scapolite..carbonate net-veining, Fair Isle PLATE VI. Photomicrographs...entirely of finely crystalline carbonate. Both the illite and carbonate have in places partially replaced...producing irregular edges. In some cases the carbonate matrix forms 20 per cent of the total volume....colour from khaki brown to reddish brown. The carbonate cement is unchanged, but quartz and feldspar clasts...clasts have been locally replaced by carbonate. In some sections calcite forms 50 to 70 per cent of the |  | | Journal (issue) | | Isle II 16 28 29 .. PLATE V. Scapolite..carbonate net-veining, Fair Isle PLATE VI. Photomicrographs...entirely of finely crystalline carbonate. Both the illite and carbonate have in places partially replaced...producing irregular edges. In some cases the carbonate matrix forms 20 per cent of the total volume....colour from khaki brown to reddish brown. The carbonate cement is unchanged, but quartz and feldspar clasts...clasts have been locally replaced by carbonate. In some sections calcite forms 50 to 70 per cent of the |  | Peng, Xiaotong, Guo, Zixiao, Chen, Shun, Sun, Zhilei, Xu, Hengchao, Ta, Kaiwen, Zhang, Jianchao, Zhang, Lijuan, Li, Jiwei, Du, Mengran (2017) Formation of carbonate pipes in the northern Okinawa Trough linked to strong sulfate exhaustion and iron supply. Geochimica et Cosmochimica Acta, 205. 1-13 doi:10.1016/j.gca.2017.02.010 | Journal (article/letter/editorial) | | Accepted Manuscript Formation of carbonate pipes in the northern Okinawa Trough linked to strong sulfate... J., Zhang, L., Li, J., Du, M., Formation of carbonate pipes in the northern Okinawa Trough linked to...apply to the journal pertain. 1 Formation of carbonate pipes in the northern Okinawa Trough 2 linked...sediments, 20 can lead to the formation of carbonate deposits at or beneath the sea floor. Although... 22 which it may influence the formation of carbonate deposits remains poorly understood. 23 Here |  | | Journal (article/letter/editorial) | | depositional model is proposed where shallow-marine carbonate (ramp) deposition interfaced with wave-influenced...clinochlore Quartz, hematite, goethite, microcline Quartz, hematite, goethite Quartz, muscovite, kaolinite...Quartz, biotite, goethite Quartz, muscovite, kaolinite Quartz, hematite, muscovite, goethite, kaolinite Quartz...calcite, clinochlore, biotite Quartz, biotite, goethite Quartz, hematite, kaolinite Lithofacies (LF)...Siltstone LF8 Sandstone As LF6A, but with BIF and carbonate clasts; 65-75 m thick Red-brown weathering with |  | | Journal (article/letter/editorial) | | Mineralization occurs in the form of stockwork and veins, comprising predominantly magnetite and actinolite...apatite. Fluid inclusions in the late-stage quartz veins are inferred to have homogenized between 186◦ C...late-stage carbonate veins have values of 3.28–6.14‰ at 100◦ C. These data in the late-stage veins imply introduction...isotope data suggest that the magnetite-apatite veins formed from a predominantly magmatic-derived fluid...facilitating precipitation of sulphides, quartz, and carbonate veins. Keywords: Alborz-Azarbaijan structural zone; |  | | Report (chapter) | | leaching and goethite replacement in the upgrading of iron formation to high-grade martite– goethite (M-G) ores...chemistry† Martite – mplH-(goethite) M-mplH-(G) 4800 (Brockman IF) (ochreous) goethite– martite ore M-(o)G...M-mplH-(G) 66% Fe, 0.5% LOI, 0.16% P, low Si, Al Goethite – martite ore M-G 63% Fe, 7.0% LOI, 0.14% P...microplaty hematite bands, locally brownish stained by goethite Friable or hard, dark grey-brown, porous rock...alternating martite and goethite bands, locally dominated by soft, powdery ochreous goethite Hard, massive, dark |  | | Journal (article/letter/editorial) | | has been reported from granite-related mineral veins across SW England in previous presentations to the...profile are hematite (mainly martite), magnetite and goethite. In the QEMSCAN species identification protocol...categories namely goethite, goethite/limonite and goethite (P) and includes goethite pseudomorphs after...carbonates and silicates, ochreous goethite or limonite and vitreous goethite (Ramanaidu et al., 2008). Development...Development of these was based on the knowledge that goethite can contain Al, Si and P in its lattice, but also |  | | Book (edition) | | in a regular network, leaving some unaltered carbonate in interstitial spaces. Biomineralisation Biomineralisation...Valleriite Lithiophorite yellow, red, brown Goethite strong, orange to brown Vonsenite strong, orange... Series: Gold Point Group: • hydrothermal ore veins, • cementation zone of Ag-rich sulfide deposits...“knitted” silver (white), galena (medium grey), carbonate matrix (dark grey); Himmelsfürst Mine, Brand-Erbisdorf...Series: Silver Point Group: • epithermal quartz veins, • contact metamorphic deposits, • pegmatites, • |
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