Modern dolomite formation caused by seasonal cycling
To decode the enigma of ancient dolomite, we examined a modern dolomite forming environment, and found that a cyclic shift in microbial community PRECIPITATION OF DOLOMITE In the heterogeneous equilibrium dolomitesolution: CaMg(CO3)z (dolomite) Ca2+ + Mg2+ + 2CO$ (F) (16) at equilibrium under any given Chapter 4 Chemistry of Dolomite Formation ScienceDirect
The Dolomite Problem: A Matter of Time ACS Publications
Dolomite can form in lakes, on or beneath the shallow seafloor, in zones of brine reflux, and in early to late burial settings It may form from seawater, from Evidence of primary dolomite formation by a process as common as microbial sulphate respiration under conditions that currently prevail in the seabed, How does dolomite form? ScienceDaily
Thermodynamic analysis of theoretical dolomite
Abstract In this study, an integrated system is proposed to form dolomite chemically from seawater and carbon dioxide The system contains three main chemical processes: formation of magnesium It forms white, tan, gray, or pink crystals Dolomite is a double carbonate, having an alternating structural arrangement of calcium and magnesium ions Unless it is in fine Dolomite (mineral)
Frontiers Characteristics and genesis of dolomite in
Based on the petrographic analysis, the dolomite in the Xiaoerbulake Formation can be divided into two types which are matrix dolomite (MD) and cement dolomite (CD) 421 Matrix dolomite Matrix Dolomite, CaMg (CO3) 2 is a common component of many carbonate rocks and typically forms through the replacement of limestone However, despite intensive study for more Dolomite an overview ScienceDirect Topics
Dolomite: Identification, Pictures & Info for Rockhounds
Dolomite rock (or dolostone) is, by definition, made of over 50% calciummagnesium carbonate (the mineral dolomite), usually in the form of welldefined crystals Some calcite is also possible as a remnant of the More than 90 percent of dolomite is made up of the mineral dolomite It was first described scientifically in the 18th century But who would have thought that the formation of this mineral isHow does dolomite form? EurekAlert!
How does Dolomite form? Materials Today
Not only in the Dolomites, but throughout the world dolomite is quite common More than 90 percent of dolomite is made up of the mineral dolomite It was first described scientifically in the 18th century But who would have thought that the formation of this mineral is still not fully understood, although geologists are aware of large depositsDolomite (also known as dolomite rock, dolostone or dolomitic rock) is a sedimentary carbonate rock that contains a high percentage of the mineral dolomite, CaMg(CO 3) 2 It occurs widely, often in association with limestone and evaporites,though it is less abundant than limestone and rare in Cenozoic rock beds (beds less than about 66 million years in Dolomite (rock)
Carbonates and Phosphates UMass
Dolomite –MgCa(CO 3) 2 Hexagonal (trigonal) mineral = uniaxial (‐ve) Dolomite has a slightly lower symmetry space group, but displays all the expected features of the carbonates Rhombohedral cleavage, high birefringence, twinned Structure consists of ideally sorted Mg and CaAbstract The direct crystallization of dolomite from an aqueous solution at temperatures between 60–220 °C was followed in situ through timeresolved synchrotronbased energydispersive Xray diffraction combined with offline highresolution imaging, Xray diffraction, and infrared spectroscopy Crystalline CaMg (CO 3) 2 phases form A route for the direct crystallization of dolomite
The Dolomite Problem: A Matter of Time ACS Publications
Dolomite, CaMg(CO 3) 2, is an abundant carbonate mineral in ancient rock formations, but it is extremely scarce in modern sedimentary environmentsThis intriguing observation has been repeatedly referred to as the “dolomite problem” in the geological literature Many geoscientists over time have almost obsessively searched for a solution Semantic Scholar extracted view of "How does dolomite application affect the greenhouse gases emissions from the Skip to search form Skip to main content Skip to account menu Semantic Scholar's Logo Search 214,765,215 papers from all fields of science Search Sign In Create Free Account DOI: 101016/jfuel2022;How does dolomite application affect the greenhouse gases
Dolomite: occurrence, evolution and economically important associations
Dolomite can form in lakes, on or beneath the shallow seafloor, in zones of brine reflux, and in early to late burial settings It may form from seawater, from continental waters, from the mixing of basinal brines, the mixing of hypersaline brine with seawater, or the mixing of seawater with meteoric water, or via the cooling of basinal brinesOn the basis of the mode of formation, dolomites can broadly be divided into two groups: primary dolomite and secondary dolomite 2 Primary dolomite precipitate directly from aqueous solution, mostly at or near room temperature (2035 o C), with no CaCO 3 dissolution involved 3 However, dolomite can also form as a secondary phase Dolomite and dolomitization model a short review
What is Dolomitization? Formation, Origin & Formula
What is Dolomite? In northern Italy, tall mountains made of a peculiar white stone grace the landscape These mountains are primarily made of a very interesting type of stone It looks likeDolomite is a common mineral It is also known as CaMg (CO 3) 2 and is a type of compact limestone consisting of a calcium magnesium carbonate In combination with calcite and aragonite, dolomite makes up approximately 2% of the earth's crust The mineral was first described by and then named after the French mineralogist and geologist DeodatDolomite Encyclopedia
The History and Chemistry of Rock–not the Rolling Stones, the
If you take a sample of rock from one of the main peaks of Northern Italy's Dolomite Mountains and add hydrochloric acid, the effervescence will be quite weak The streaming of carbon dioxide bubbles will be far more vigorous if you add the same acid to rocks from most Alpine peaks Both samples contain carbonate, theSedimentary Petrology Frederick L Schwab, in Encyclopedia of Physical Science and Technology (Third Edition), 2003 IVD Dolomite and Dolomitization In many ancient limestones, the minerals calcite and aragonite have been partly or completely replaced by the mineral dolomite, producing replaced by the mineral dolomite, producing the rock Dolomite (Mineral) an overview ScienceDirect Topics
How does Dolomite form? GEOMAR HelmholtzZentrum für
04062012/Kiel The formation of the mineral dolomite is still puzzling scientists Researchers from the Cluster of Excellence "The Future Ocean" and GEOMAR Helmholtz Centre for Ocean Research Kiel together with colleagues from Switzerland and Spain have now shown that bacteria can facilitate the formation of dolomite The study has been The origin of spheroidal dolomitized burrow from AlSubiya sabkha in Kuwait was previously described as enigmatic as no evidence of precursor calcium carbonate was found in the siliciclastic sedimentDolomite genesis in bioturbated marine zones of an early
Structure of Dolomite Chemistry Stack Exchange
And the final step is to combine them now, instead of separating the two phases, 1/2 of the calciumions are just exchanged by magnesium to form the dolomitestructure So you could say that carbonate forms a cubic packing where 50% of the octahedral sites are occupied by calcium and the 50% by magnesium for exampleDolomite is not a simple mineral; it can form as a primary precipitate, a diagenetic replacement, or as a hydrothermal r metamorphic phase, all that it requires is permeability, a mechanism that(PDF) Dolomite: Occurrence, Evolution and Economically
Controls of temperature, alkalinity and calcium ScienceDirect
The obtained results on the evolution of the stoichiometry of dolomite and magnesite and on the COD of dolomite indicate that the formation of stoichiometric and well ordered dolomite and of stoichiometric magnesite follow a ripening process and proceed through dissolution and reprecipitation of a sequence of intermediate phases, Aiming at the scientific problem that only part of dolomite acts as dolomite reservoir, this paper takes the multiple dolomitebearing formations in the Tarim and Ordos basins, NW China and Sichuan Basin, SW China as the study object, by means of mineral petrological analysis and geochemical methods including carbonate clumped isotope, U Dolomitization evolution and its effects on hydrocarbon reservoir