scispace - formally typeset
Search or ask a question
Topic

Ankerite

About: Ankerite is a research topic. Over the lifetime, 859 publications have been published within this topic receiving 23960 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this article, the results of Mossbauer spectroscopic investigations of the transformations of different iron-bearing minerals in some Indian coals of different geological origin with varying mineral contents during their ashing and pulverished fuel combustion (PFC).

49 citations

Journal ArticleDOI
TL;DR: Three separate stratiform Pb-Zn deposits occur on the Jason property in the Macmillan Pass area of the Yukon, Canada as discussed by the authors, and are associated with a fault-bounded, second or third-order subbasin, referred to as the MacPass graben.
Abstract: Three separate stratiform Pb-Zn deposits occur on the Jason property in the Macmillan Pass area of the Yukon, Canada. The deposits are contained within chert conglomerates and finer grained clastic rocks of Middle to Late Devonian age. The deposits are on the eastern margin of the Cambro-Ordovician Selwyn basin and are associated with a fault-bounded, second or third-order subbasin, referred to as the MacPass graben.Three different facies of mineralization and associated sedimentation have been defined on the basis of field relationships, drill core descriptions and correlations, and detailed petrography, Facies A comprises massive to thick-bedded galena and sphalerite with abundant pyrrhotite and pyrite. This facies is extensively crosscut by galena-bearing quartz siderite and quartz ankerite veins and has the highest combined Pb-Zn-Ag concentrations. Facies A is proximal to the hydrothermal source represented by the veins. Facies B has a mineralogic assemblage and textures common to facies A but is considerably thinner. Abundant soft sediment deformation features indicate facies B formed from slumping of unstable accumulations of material from facies A. Facies C contains well-bedded sphalerite, chert, and barite laminae and is distal to the hydrothermal source. Secondary alteration and pore-filling minerals found in facies C include celsian, kaolinite, ankerite, and a complex suite of rare Ba carbonates.Fluid inclusions in quartz, siderite, and ankerite within veins crosscutting facies A indicate that the ore-forming fluids were NaCl brines (9 equiv. wt %) with temperatures of approximately 250 degrees C. Sulfur isotope data indicate that the sulfides within the three separate deposits had a common sulfur source, probably reduced seawater sulfate. Barite in the laminated facies C has delta 34 S values consistent with coeval Devonian seawater. The sulfide minerals are approximately 10 per mil lighter than coeval seawater.A maximum water depth of 420 m for venting of hydrothermal fluids was determined by combining fluid inclusion data with boiling curves for H 2 O-NaCl. Brine densities indicate the hydrothermal plume may have reached the seawater surface and dispersed laterally to form the barite in facies C. Accumulations, on unstable slopes, of thick deposits of sulfide slumped to cause thinning and soft sediment deformation of facies B. Since facies B is a sedimentary feature, not necessarily proximal or distal to the vent, it may or may not contain barite.

49 citations

Journal ArticleDOI
TL;DR: In this article, four Jurassic-age bituminous coal (0.69-1.02 Ro%) samples were collected from coal mines from the west, central and east of central, Alborz in northern Iran.

48 citations

Journal ArticleDOI
TL;DR: In this article, the authors suggest that ankerite cement was formed from upwardly migrating formation water based on the following evidence: (i) ankerites filling the secondary pores created in the deep subsurface, (ii) an absence of unconformity during ankeritic cementation precluding involvement of meteoric water, (iii) ankersite cementation in brecciated veins synchronous with ankerit precipitation in host sandstones, (iv) occurrences of significant volumes of ankeriti precipitation in the shales indicating that the Fe and Mg

48 citations

Journal ArticleDOI
TL;DR: Li et al. as discussed by the authors reported new data on the mineral compositions and geochemical characteristics of the Jungar Li-Ga-rich coals, and provided new evidence for the origin and mode of occurrence of Al, Ga and Li in these coals.

48 citations


Network Information
Related Topics (5)
Zircon
23.7K papers, 786.6K citations
84% related
Sedimentary rock
30.3K papers, 746.5K citations
84% related
Carbonate
34.8K papers, 802.6K citations
80% related
Basalt
18.6K papers, 805.1K citations
79% related
Continental crust
11.1K papers, 677.5K citations
78% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202332
202270
202140
202027
201946
201842