Topic
Ankerite
About: Ankerite is a research topic. Over the lifetime, 859 publications have been published within this topic receiving 23960 citations.
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TL;DR: A kinetic leach column study was performed to evaluate the behaviour of these tailings in a northern context (i.e., freeze-thaw cycles) as discussed by the authors. But the results showed that the tailings were not acid generating but deemed leachable for Cd, Pb, Zn and Mn.
2 citations
TL;DR: In this paper, a study of the mineralogical composition of five coal bench samples collected from the No. M3 coal in the Jingxi Coalfield, which was intruded by an aplite sill along the roof is presented.
Abstract: Igneous intrusions significantly affect the mineralogical composition of coal. The Jingxi Coalfield, North China was subjected to the intrusion of a Mesozoic aplite; however, the resulting coal mineralogy has not been well investigated. This paper reports on a study of the mineralogical composition of five coal bench samples collected from the No. M3 coal in the Jingxi Coalfield, which was intruded by an aplite sill along the roof. The minerals present in the highest proportions in the No. M3 coal are margarite–paragonite group mineral (21.4%) and ammonian illite (72.7%), followed by ankerite (4.2%), anatase (0.7%), and rutile (0.9%). The formation of margarite, paragonite and ammonian illite is attributed to the intrusion of the aplite sill. The margarite and paragonite were formed prior to the formation of the ammonian illite. The proportion of the margarite–paragonite group mineral decreases, and the proportion of ammonian illite increases from the sill to the roof. The Ca2+ and K+ are more easily incorporated into the aluminosilicate mineral lattices than Na+ and NH4+, respectively. Thus, the Ca2+/Na+ ratio in the margarite–paragonite group mineral decreases, and the NH4+/K+ ratio in the ammonian illite increases from the sill to the roof. The formation of ankerite is also attributed to the igneous intrusion, but this mineral was formed later than the aluminosilicate minerals. The proportion of ankerite in the coal samples increases from the sill to the roof.
2 citations
Journal Article•
TL;DR: Based on the aforementioned idexes, the dolostone in Lucaogou Formation of Middle Permian in Santanghu basin is of the mixed water origin and have built the correspondent dolomitization model.
Abstract: Carbonate rock of Lucaogou Formation in Middle Permian is a major reservoir rock in Santanhu Basin and dolostone accounts for more than 50% in composition of the carbonate rock. There are two types of dolostone,one is the bedded dolostone and the other is the patch dolomite. In the bedded dolostone,the mineral dolomite has a good idiomorphism; on the contrary,in the patch dolostone,the idiomorphism of dolomite is not good. The patch dolostone is composed of ankerite with crassitude crystal replacing calcite. The dolostone has a Mg/Ca ratio of 1; a Sr content of 31×10-6-527×10-6,averaged by 217.8mg/kg; and a difference in δ18O between calcite and dolomite being less than 6. In addition,gypsum rock is not widely found in Lugcaogou Formation,with the salinity being 124.43. Based on the aforementioned idexes,we hold that the dolostone in Lucaogou Formation of Middle Permian in Santanghu basin is of the mixed water origin and have built the correspondent dolomitization model.
2 citations
22 Mar 2015
TL;DR: The carbonate system is the one of most reactive in the mineralogical assemblages of clay-rocks, and pristine clays pore water compositions are expected to be at equilibrium with carbonate minerals as discussed by the authors.
Abstract: The carbonate system is the one of most reactive in the mineralogical assemblages of clay-rocks. Consequently, pristine clay-rocks pore water compositions are expected to be at equilibrium with carbonate minerals. However, it is difficult to fully reconcile the concentration data obtained from seepage water sampled in equipped in situ boreholeswith the equilibrium concentrations obtained from pore water modeling (Pearson et al., 2011). It is especially true for dolomite whose solubility spans a large range of values in thermodynamic database as a function of crystallinity considerations, and for siderite/ankerite or other Fe-bearing carbonates whose compositions influence their solubility. The understanding of the carbonate system in clay-rock is necessary for a number of predictions including the effect of an increase of temperature on the pore water chemistry. In this respect, experiments were conducted to study the kinetics of equilibration of carbonate mineral assemblages as a function of temperature (25-80°C) in chemical conditions otherwise similar to those encountered in the Callovian-Oxfordian clay-rock.
2 citations
Journal Article•
TL;DR: The Chiknayakanhalli (CN halli) carbonates cover a wide range from almost pure calcite and dolomite-ankerite to Mg-limestone, shaly limestone and cherty limestone as discussed by the authors.
Abstract: Carbonates of the Chiknayakanhalli (CN halli) area include (i) dolomite, (ii) limestone, (iii) ankerite and (iv) calc-schist. Of these, dolomite is the most widely developed rock. chemically the CN halli carbonates cover a wide range from almost pure calcite and dolomite-ankerite to Mg-limestone, shaly limestone and cherty limestone/dolomite/ankerite. In their trace element content, the rocks are typically much depleted in comparison with carbonatites. Available evidence indicates overall primary chemical sedimentary deposition of the carbonates in a barred basin with a gradual rise in salinity, pH, temperature and Mg:Ca ratio of the environment. Evidence of dolomitization is limited to the border zones between limestone and dolomite and there is no recognizable indication of organic activity.
2 citations