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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: The techniques described by Gall and Runnels are considered quite satisfactory for carbonate rocks containing calcite, dolomite, and ankerite, but does not seem applicable in its present form if the minerals siderite or magnesite are present as mentioned in this paper.
Abstract: The techniques described by Gall and Runnels are considered quite satisfactory for carbonate rocks containing calcite, dolomite, and ankerite (if the Fe content is known), but does not seem applicable in its present form if the minerals siderite or magnesite are present For similar reasons the present writer, from a small-scale study of other anhydrous carbonate minerals of known chemical composition by DTA and thermogravimetric analyses, considers it likely that additional unsuitable anhydrous carbonate minerals, although relatively unimportant, are cerussite, smithsonite, rhodochrosite (because the temperature of decomposition is too low), and witherite and strontianite (because the temperature of decomposition is considerably greater than 1000 degrees C)
13 citations
TL;DR: In this article, the main characteristics of pyrochlore-group minerals are given: compositional variation, morphology, and zoning in carbonatites of the Belaya Zima alkaline pluton.
Abstract: Pyrochlore-group minerals are the main concentrators of niobium in carbonatites of the Belaya Zima alkaline pluton. Fluorcalciopyrochlore, kenopyrochlore and hydropyrochlore were identified in chemical composition. Their main characteristics are given: compositional variation, morphology, and zoning. During evolution from early calcite to late ankerite carbonatites, the UO2, TiO2, REE, and Y contents gradually increased. All carbonatite types are suggested to contain initial fluorcalciopyrochlore. However, in calcite–dolomite and ankerite carbonatites, it is partially or completely hydrated due to hydrothermal processes at the late stage of the pluton. This hydration resulted in the appearance of kenopyrochlore and hydropyrochlore due to removal of Ca, Na and F, and input of Ba, H2O, K, Si, Fe, and probably U and REE. At the last stage of the pluton, this hydrated pyrochlore was replaced by Fe-bearing columbite.
13 citations
TL;DR: In this article, an unsupervised ML approach, non-negative matrix factorization with custom k-means clustering (NMF k ) was applied to the data generated by reactive-transport simulations of GCS.
13 citations
TL;DR: A high resolution stratigraphically controlled rare earth element and carbon isotope study of the 2.75 Ga old Algoma-type Helen Iron Formation has provided new insights into the chemistry of late Archean seawater.
12 citations
TL;DR: The role of manganese as redox tracer in the context of iron formations (IF) has received renewed attention in recent years as discussed by the authors, with the main emphasis on the Mn-enriched upper 120 m of the Griquatown IF.
12 citations