ferroan dolomite

ferroan dolomite

[′fer·ə·wən ′dōl‚mīt]
(mineralogy)
A species of ankerite having less than 20% of the manganese positions occupied by iron.
References in periodicals archive ?
The XRD, SEM and EDS data revealed that hematite, illite, goethite and ferroan dolomite cement filled the intergranular pores in the Chichali Formation.
For Lumshiwal Formation, both physical and chemical compaction, authigenic mineralization, cementation, and late stage dissolution are commonly observed, that included calcite, ferroan dolomite, kaolinite, illite and quartz overgrowth cements.
The excursion corresponds to the dolostones of the Pae Member and is likely caused by a high content of secondary ferroan dolomite.
The Pae Member has positive MS anomaly likely because of fluid migration-caused chemical flux, which produced secondary iron input and/or rearrangement of already existing iron and precipitation of ferroan dolomite crystals (Fig.
Goldsmith (1959) notes that ankerite is really a ferroan dolomite because no ordering occurs, as verified by the absence of superlattice reflections in XRD patterns.
These are an early low-temperature dolomite, a regional replacive dolomite, black matrix breccia and a hydrothermal ferroan dolomite.
Hydrothermal ferroan dolomite cross-cuts all other dolomite types and overlaps the sulphides.
Semiquantitative EDS microprobe analysis shows this dolomite to be enriched in iron, and is thus a ferroan dolomite.