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ferroan magnesite

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Journal Article
Journal: Economic Geology
Published: 01 May 1992
Economic Geology (1992) 87 (3): 686–705.
... are most commonly ferroan dolomite, magnesian siderite, and ferroan magnesite; the latter two are more abundant than dolomite where alteration is intense. Calcite and ferroan dolomite formed during metamorphism and the composition of the hydrothermal and metamorphic carbonates may be different...
Journal Article
Published: 01 November 2015
American Mineralogist (2015) 100 (11-12): 2655–2669.
... starts under oxic conditions, the observed temporal sequence of interfacial layers consists of: a hematite/SiO 2(am) assemblage, Fe-rich phyllosilicates with mixed Fe valence and a non-passivating Fe-free amorphous SiO 2 layer, which allows the formation of ferroan magnesite. In contrast, starting...
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Journal Article
Published: 01 February 1995
The Canadian Mineralogist (1995) 33 (1): 47–53.
... in a small prospect pit near the long-abandoned Clear Creek mercury mine, New Idria district, San Benito County, California. The mineral is most closely associated with ferroan magnesiochromite and is found as isolated and clustered grains on a crust composed of ferroan magnesite and quartz. Other mercury...
Journal Article
Journal: Economic Geology
Published: 01 October 1995
Economic Geology (1995) 90 (6): 1676–1693.
... fluids with about 2 rn NaCl, 1.5 m CO 2 , and 0.3 m CH 4 . The zonation in these assemblages from quartz to talc to ferroan magnesite also reflects decreasing silica activity in the fluid. The stage 2 assemblages extensively overprinted the earlier formed assemblages. Pyrrhotite is the dominant sulfide...
Image
Diagenetic features within core C. (a) <span class="search-highlight">Magnesite</span> being replaced by apatite,...
Published: 20 December 2017
Figure 6. Diagenetic features within core C. (a) Magnesite being replaced by apatite, which is subsequently being replaced by bladed dolomite pseudomorphs of gypsum. (b) Twin CPO and CL images of a dolomite fracture with ferroan magnesite permeating the matrix and dissolution in the center. Note
Journal Article
Published: 01 October 2003
The Canadian Mineralogist (2003) 41 (5): 1167–1172.
... mine, New Idria district, San Benito County, California. It is most closely associated with native mercury, eglestonite, montroydite, cinnabar and an undefined Hg oxyhalide in a host rock principally composed of quartz and ferroan magnesite. Vasilyevite occurs in small shallow quartz-lined vugs...
FIGURES
Journal Article
Published: 01 July 1998
Bulletin de la Société Géologique de France (1998) 169 (4): 563–571.
... ultrabasic rock (listvenite), which represents a new type of ore deposit in Burkina Faso. The precipitation of gold can be achieved during the late stage of alteration inducing the crystallization of ankerite, quartz and muscovite in albitite, and ferroan-magnesite, fuchsite and quartz in serpentinized...
Image
QEMSCAN image, sample BSD102-483, showing compositional zonation within rep...
Published: 01 June 2009
F ig . 15. QEMSCAN image, sample BSD102-483, showing compositional zonation within replacive carbonate. Fe-poor magnesite forms inner ring around original margin of extensively replaced sulfide bleb within larger aggregate of ferroan magnesite. Sulfide mineralogy: polydymite, millerite, pyrite.
Image
Diagenetic features within core A. (a) Mollusk that inverted from aragonite...
Published: 20 December 2017
with an authigenic ferroan dolomite rim growing into the surrounding porosity. (d) SEM (BSE) image with an EDS overlay indicating mineral composition. A calcite fracture is in yellow with ferroan magnesite in blue found within the fracture and the surrounding matrix. (e) Fracture filled with pyrite (Py
Journal Article
Published: 25 February 2022
Journal of Sedimentary Research (2022) 92 (2): 144–165.
... minerals. The two dolomite phases (D1 and D2) show similarity in their composition (both are non-ferroan, nonstoichiometric, and poorly ordered). Nonetheless, they show different size (D1 is fine-crystalline and D2 is medium- to coarse-crystalline) and timing of authigenesis: D1 predates magnesite...
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Journal Article
Journal: Economic Geology
Published: 01 July 1995
Economic Geology (1995) 90 (4): 763–781.
... from textural and isotope data.Scheelite was produced as a by-product of magnesite and is hosted by various chlorite-rich phyllites and black schist-rich metaclastic rocks and mainly by metacarbonate rocks (ferroan dolomite, magnesite). The scheelite mineralization was affected by both Alpine...
Journal Article
Published: 01 April 2012
Mineralogical Magazine (2012) 76 (2): 357–376.
...) but REE depleted compared with volcanic dolomite carbonatites worldwide. The mineral assemblage consists of Sr-rich (0.55 wt.% SrO) ferroan dolomite, magnesite and pseudomorphs of chlorite after phlogopite, consistent with derivation from a carbonated and hydrated mantle. However, chrome spinel crystals...
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Journal Article
Published: 01 June 2007
The Canadian Mineralogist (2007) 45 (3): 497–501.
...-cutting early-generation olivine, orthopyroxene, clinopyroxene and spinel. The metasomatic veinlets contain early and late generations of minerals. The earlier generation includes clinopyroxene, olivine, second-generation spinel, apatite, calcite, Fe-rich dolomite, ferroan magnesite and high-Ba, high-Ti...
FIGURES
Journal Article
Journal: Interpretation
Published: 20 December 2017
Interpretation (2018) 6 (1): SC1–SC13.
...Figure 6. Diagenetic features within core C. (a) Magnesite being replaced by apatite, which is subsequently being replaced by bladed dolomite pseudomorphs of gypsum. (b) Twin CPO and CL images of a dolomite fracture with ferroan magnesite permeating the matrix and dissolution in the center. Note...
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Journal Article
Published: 08 August 2023
Mineralogical Magazine (2023) 87 (5): 748–766.
... limit. Figure 4. Compositional variation of carbonates in the Newania carbonatites. (a) Ca-Mg-Fe plot (after Mitchell and Smith, 2017 ); (b) Mg/Fe vs . Ca (apfu); (c) Mn vs . Fe (apfu). Grey field: dolomite–ferroan dolomite compositions in global carbonatites; yellow field: magnesite...
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Journal Article
Journal: Economic Geology
Published: 01 June 2012
Economic Geology (2012) 107 (4): 599–644.
... supergene stage, effected the quartz-magnetite BIF. These are (1) syn- to post-D 1 , iron-rich carbonate ± magnetite (siderite, magnesite, ± ferroan dolomite) replacement of quartz layers in the BIF; (2) during D 2 to D 4 folding and faulting, structurally controlled leaching of carbonate, producing...
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Journal Article
Published: 01 April 2024
American Mineralogist (2024) 109 (4): 701–708.
... of dolomite and ferroan dolomite could represent a reservoir for carbon storage within the deep mantle, it is important to study the high-temperature behavior of the dolomite-ankerite solid solutions. Pure end-member CaMg(CO 3 ) 2 undergoes a breakdown reaction to magnesite and Ca-carbonate above 5 GPa...
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Journal Article