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Jan 1990. James R. Hein. Marjorie S. Schulz. Jung-Keuk Kang. PDF | On Dec 27, 2022, T Brown and others published MANGANESE: A MINERAL SYSTEMS ANALYSIS | Find, read and cite all the research you ...
The manganese ore in the 1st Member of the Datangpo Formation is associated with microcrystalline quartz veins of probable early diagenetic origin. Rhodochrosite (MnCO 3) is the dominant mineral (20–30%) in the Mn-ore samples. The diameters of spherical rhodochrosite crystals vary from 2 to 10 μm (Fig. 5 A–B).
Fault-controlled hydrothermal alteration of Palaeoproterozoic manganese ore in Wessels Mine, Kalahari manganese field ... J. Gutzmer; Fault-controlled hydrothermal alteration of Palaeoproterozoic manganese ore in Wessels Mine, Kalahari manganese field. South African Journal of Geology 1995;; 98 (4): 430–451. doi: Download citation …
Mn–Zn ferrite powders were produced from low-grade manganese ore (LMO) via the chemical co-precipitation method combined with the ceramic method, after the LMO was leached in sulfuric acid and the obtained solution was purified. The effect of the pH on the magnetic properties of Mn–Zn ferrite was investigated by the varying pH …
The Mamatwan-type ore is the sedimentary-diagenetic protolith to the hydrothermal Wessels-type ore (Gutzmer and Beukes, 1995). Rare earth element data for the manganese ores of the lowermost ore bed are available (Gutzmer and Beukes, 1998b, van Staden, 2002; M. Bau, pers. comm.), but are unpublished.
However, the genesis of manganese ore deposits is still controversial and remains a long-standing source of debate; there are several viewpoints including biogenesis, hydrothermal sedimentation, gravity flows, cold-spring carbonates, etc. Geochemical data from several manganese ore deposits show that there are positive …
Abstract. Hydrothermal vents provide a major source of dissolved Mn (II) to the oceans, where concentrations range from 5 mM within the 350°C hot smokers to just above ambient seawater concentration in far field vent plumes. The Mn (II)-rich environments within warm vents and vent plumes provide a suitable habitat for Mn (II) …
The average Y anomaly of the studied samples is positive (Y PAAS /Ho PAAS = avg. 1.33) and are within the range 1.1–2.4 of hydrothermal manganese deposits given by Bau et al. . The Tafak Mn-ore samples suggest hydrothermal origin with negative Ce (0.46) and positive Y anomaly (1.33).
Major regularities in the formation of manganese rocks and ores have been established on the basis of available published and original data. The proposed genetic classification of main manganese deposits (with model examples) is as follows: sedimentary-diagenetic (Nikopol, Bol'she-Tokmak; Ukraine), (volcanogenic) …
The large number of significant manganese deposits in the Oakover Basin, previously thought to reflect a spatial association with Carawine Dolomite, more likely …
In addition, some deposits are epigenetic and metamorphic, and a few are magmatic hydrothermal types (Fu et al., 2014; Xiang et al., 2020). Fig. 11 shows a comparison of the combined geochemical abundance of Mn-Te with known manganese ore deposits in South China.
Phase analysis. XRD pattern of the Mn-ferrite synthesized from low grade Mn-ore at different sintering temperatures (1000, 1100 and 1200 °C) is shown in Fig. 1.Various phases such as manganese ...
The main four metallogenetic types of manganese ore deposits across the globe are sedimentary (or volcano-sedimentary); magmatogenic (hydrothermal or contact-metasomatic); meta …
Manganese ore-based wet flue gas desulfurization (MFGD) is a resourcing technology capable of simultaneously reutilization flue gas sulfur dioxide (SO 2) ... At present, two methods are mainly used to synthesize calcium sulfate whiskers, namely, atmospheric acidification and hydrothermal treatment (Fu et al., 2017).
Manganese (Mn) ore deposits are widely distributed in China and can be divided into six types based on origin and subsequent modifications: (1) sedimentary, (2) volcanic-sedimentary, (3) metamorphosed, (4) hydrothermally modified, (5) hydrothermal, and (6) supergene. Sedimentary and supergene Mn ore deposits are economically the …
Based on our resistivity models, density models, and geological survey, the manganese ore-forming model was derived, which can help to provide geophysical evidence for the origin of the Datangpo ...
Here, we show that the Morro da Mina Mn-ore deposit in Minas Gerais, Brazil, contains Mn-silicate–carbonate ore and associated graphitic schist that likely preserve δ 98 Mo of Palaeoproterozoic ...
Crusts of manganese oxide minerals in veins are persistently layered with psilomelane, hollandite, cryptomelane or coronadite. Psilomelane is the most widespread and abundant oxide mineral and is typically massive, sooty, and black. Hollandite, coronadite, and cryptomelane are present as distinct fibrous layers, which may be as much as 3 mm thick.
Manganese ferrite MnFe 2 O 4 powders have been produced from low grade manganese ore after leaching of the ore in sulfuric acid and hydrogen peroxide. The produced solution was precipitated by using 5. M sodium hydroxide until pH 9–12 after correction Fe:Mn mole ratio to 2:1 using waste ferrous sulfate from iron and …
Hydrothermal manganese minerals in the second stage grew by replacing pre-ore minerals and can be distinguished in terms of texture, grain-size, and phase abundance. There are three sub-stages of ore minerals (sub-stages I, II, and III), which comprise different proportions of manganese and other oxy/hydroxides.
Hydrothermal manganese deposits in island arcs and related to subduction processes: a possible model for genesis. Ore Geol. Rev., 4: 145-153. Submarine hydrothermal manganese deposits have recently been recovered from a number of island arc settings such as the Tonga-Kermadec Ridge, Ogasawa arc-trench, …
The manganese ore deposit of Praborna crops out in the Zermatt-Saas unit of the Western Alps, in the St. Marcel valley. ... strongly support the hypothesis of an oceanic hydrothermal origin for manganese in the Praborna and in the Ligurian ore deposits. You do not have access to this content, please speak to your institutional administrator if ...
environment analysis. Despite the long mining history of subaerial manganese ore in this area, the origin of the manganese ore layer remains controversial. There are two opposing models. On the one hand, the hydrothermal genetic model suggested by Xu et al. [5] indicated that the manganese deposit originated from …
The Zunyi manganese deposits contain various manganese ore types, such as those characterized by massive, oolitic and clastic structures, and these have discernible vertical regularity throughout the stratigraphy of the formation. ... Our model favors this viewpoint, as hydrothermal introduction of both manganese and silica to …
Highlights REE geochemistry of different ore types in the Kalahari Manganese Field. REE mobility during hydrothermal alteration. Hydrothermal alteration leads to residual REE enrichment. A power trend observed in the Ce anomaly on a (Ce/Ce*) vs. (Pr/Pr*) diagram. Diagenetic apatite dissolution and small-scale redistribution in new …
The Sorkhvand manganese deposit is located in the Zagros thrust belt, close to the Kermanshah ophiolite mélange. This ophiolite records the early stage of Neo-Tethys evolution in the western part of Tethyan realm. In the study area, Mn-mineralization occurs as irregular lenses or interlayers with radiolarian cherts within the Cretaceous …
Hausmannite (Mn 3 O 4), a manganese oxide with a tetragonally distorted spinel structure, is considered to be ferrimagnetic with a very low Curie temperature of 42.5 K. However, strongly magnetic hausmannite has been discovered in some of the hydrothermally altered high-grade manganese ores of the giant Kalahari manganese …
REE geochemistry of different ore types in the Kalahari Manganese Field. REE mobility during hydrothermal alteration. Hydrothermal alteration leads to residual …
Jung-Keuk Kang. PDF | On Dec 27, 2022, T Brown and others published MANGANESE: A MINERAL SYSTEMS ANALYSIS | Find, read and cite all the research you need on ResearchGate.
However, the genesis of manganese ore deposits is still controversial and remains a long-standing source of debate; there are several viewpoints including …
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