2021.2.18 The sedimentological studies on ancient dolomite, namely cap dolostones approximately 635 Ma old, from the Puga Formation in Brazil, confirm our concept even
Read More2023.8.21 Formation: Dolomite forms in various geological settings, typically through a process called dolomitization. This process involves
Read More2022.1.1 The extent of dolomite crystallization reveals that dolomite, dolomite with relic texture, and grain dolomite without relic texture were developed in the Sanshanzi
Read More2000.11.1 Dolomite is not a simple mineral; it can form as a primary precipitate, a diagenetic replacement, or as a hydrothermal/metamorphic phase, all that it requires is
Read More2016.5.18 Due to elevated temperature of formation, dolomitization mechanism is efficient in converting existing calcite into dolomite at a much faster rate compared to
Read More2019.9.24 The results show that formation of dolomite is favorable at temperature ranges of 313–470 K based on the thermodynamic study. The exergy efficiency of dolomite formation is found to be about 23.8% and
Read More2015.7.1 Since classic theory, molecular replacement of limestone by dolomite was proposed by Elie de Beaumont in 1837, the origin of porosity in dolostone has received
Read More2018.7.6 The fabric-destructive dolomite formed following the burial model at elevated temperatures; these rocks exhibit the lowest Sr and Na contents, δ 18 O values generally ranging from −7.01‰ to −6.62‰ (with
Read More2021.3.23 Attempts to solve the multifaceted “dolomite problem” have shed some light on important factors controlling dolomite formation including high salinity 5,6, dissolution–precipitation reaction ...
Read More2016.1.1 Giovanni Arduino, an Italian geologist, is credited with the first identification of the mineral now known as dolomite in 1779 (McKenzie and Vasconcelos, 2009); however, Déodat de Dolomieu is credited with recognizing the mineral that makes up the mountains now known as the Dolomite Mountains of Northern Italy (de Dolomieu, 1791; Zenger et
Read More2021.2.18 Dolomite formation in the quaternary has also been linked to changes in water and redox chemistry that led to elevated cell mortality and organic matter ... (Lagoa Vermelha, Rio de Janeiro, Brazil
Read More2022.8.1 In the long geological history, dolomite with low order de- gree may experience an increase in the order degree as a result of metasomatism and recrystallization [18]. The original rock of buried metasomatic dolomite I may be dolomite with a certain initial Mg2+ concentration and order degree, and that of buried metasomatic dolomite II may be ...
Read More2022.6.3 Dolomite, CaMg (CO 3) 2, is an abundant carbonate mineral in ancient rock formations, but it is extremely scarce in modern sedimentary environments. This intriguing observation has been repeatedly referred to as the “dolomite problem” in the geological literature. (1−5) Many geoscientists over time have almost obsessively searched for a ...
Read More2022.1.1 The dolomite of the Cambrian Sanshanzi Formation is distributed in the western Ordos Basin and was deposited during the Furongian Epoch of late Cambrian (Chen, 2007, Wu, 2013).It is underlain by the Zhangxia Formation and overlain by the Lower Ordovician Yeli Formation (Fig. 3) (Chen, 2007), which is mainly composed of dolomite,
Read More2000.11.1 The original mineral name dolomie was given by N.T. Saussare, in 1792, in honor of the French geologist Deodat Guy de Dolomieu (1750–1801) and was first applied to rocks in the Tyrolean Alps (Bourrouilh-Le Jan, 2000).Dolomite, the rock, contains a large proportion of dolomite the mineral. Ideal dolomite has a crystal lattice consisting of
Read More2023.11.12 La dolomitisation est la formation de dolomie. Gîtologie La dolomie est donc une ... La précipitation directe de dolomite a longtemps été mise en question, considérant qu'il ne se formait plus de dolomite à la surface de globe. Entre 1909 et 1987, la thèse du gradualisme conduisait même la communauté géologique mondiale à accepter
Read More2021.12.15 In addition to dolomite, traces of low-Mg calcite with MgCO 3 contents of ca. 5.25 mol% (d 104 = 3.019 Å) were also detected in the annealed biotic protodolomite samples either heated at 200 °C or 300 °C and in the 60 °C-synthesized abiotic protodolomite sample heated at 300 °C (Figs. 2 b, 3 a and Fig. S2). The biotic
Read More2015.4.20 dolomite was proposed by Elie de Beaumont in 1837, the origin of porosity in dolostone has received considerable attention and several theories have been advanced ( Landes, 1946; Weyl, 1 960;
Read More2022.6.16 The Middle-Upper Cambrian Xixiangchi carbonates in the Sichuan Basin have been pervasively dolomitized. In the presented work, petrographic investigation revealed three generations of the Xixiangchi
Read More2023.11.8 Dolomite is even used in facial creams and toothpaste. Usually minerals are named after a famous geographic locality where they occur, but dolomite was named for a French geologist named Deodat de
Read MoreDolomite, also known as " dolostone " and " dolomite rock ," is a sedimentary rock composed primarily of the mineral dolomite, CaMg (CO 3) 2. Dolomite is found in sedimentary basins worldwide. It is thought to form by the postdepositional alteration of lime mud and limestone by magnesium-rich groundwater. Dolomite and limestone are very similar ...
Read More2018.9.20 The only abundant source of Mg2+ ions for early diagenetic surface and near-surface dolomitization is seawater. Dolomitization also creates new crystals, with new rhomb growth following the ...
Read More2023.3.26 Les Dolomites, un massif montagneux exceptionnel. Les Dolomites sont situées dans le nord-est de l’Italie et constituent une partie des Alpes italiennes. Elles ont été inscrites au patrimoine mondial de l’UNESCO en 2009 pour leur beauté exceptionnelle et leurs formations rocheuses uniques, dominées par la dolomite.
Read More2023.10.2 Primary radial slow dolomite and its formation at a Miocene methane seep. Synchrotron X-ray diffraction and Raman-scattering data, including the recognition of the ordering peak (015), identify ...
Read More2023.1.6 Dolomite genesis is a century-old mystery in sedimentology. To reveal the mechanism of dolomite genesis, two core problems need to be addressed. The first is the origin and migration mechanism of Mg2+-rich fluids during the dolomitization process. The second is the kinetic barrier caused by Mg2+ hydration during dolomite precipitation at
Read Moredolomie (de Dolomieu, nom propre) Consulter aussi dans le dictionnaire : dolomie Roche sédimentaire carbonatée, renfermant plus de 50 % de dolomite. La dolomie est un carbonate double de calcium et de magnésium, de composition chimique Mg Ca (CO 3) 2, qui cristallise en prismes losangiques (rhomboèdre).. Les dolomies se forment par
Read More1995.6.1 La formation de la dolomite Type 3 s’est seulement produite dans les sédiments perméables et poreux qui ont été modifiés localement par fouissage, forage et micritisation microbiales. La lithification précoce de boue calcaire, indiquée par les instraclastes et les paléosols, a réduit localement la perméabilité et la porosité ...
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