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Dolomite 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 vuggy has a high silica content and is much harder and tougher than the typical dolomite The Herkimer Diamonds are found in petroleum lined vugs
·In the Lucaogou Formation the plagioclase content amounts to 26 % and dolomite content exceeds 25 % while the clay mineral content is mostly lower than 15 % Fig 2 Compared with the Lucaogou Formation the mineral compositions of the Chang 7 Member shale and Qingshankou Formation shale derived from the freshwater brackish water lacustrine
·In previous dissolution studies dolomite has been commonly assumed to have an ideal composition of CaMg CO 3 objectives of this work are to determine 1 if dolomites composing hydrocarbon reservoir rocks vary in chemical composition specifically Ca content and 2 the effect of Ca uptake on the dissolution rate of dolomite in HCl acid
·The dolomite content generally decreases vertically with decreasing burial depth Fig 7 along with systematic textural changes The Middle Ordovician Yijianfang Fm contains few Id The Lower Middle Ordovician Yingshan Fm is the transitional zone between pure limestone and Lds with numerous Ids and/or Pd present in those partially
3 ·The dolomite content generally shows a positive correlation with the carbonate content in the arid region of northwest China with a coupling relationship in initial dust materials Meng et al 2019 Thus the contributions of carbonate source possibly dominate the variations in dolomite content during the early Holocene and the last
·The model performance actually improves slightly with increased dolomite content in the sample for f cal = 1 the mean square of the residuals MS residuals was × 10 −5; for f cal = 0 MS residuals was × 10 −5 lower MS residuals values reflect improvement; 24 This drop in unexplained variation likely reflects the model s
The direct shear test of dolomite with different moisture content was carried out and some curves of shear strength and shear stress shear displacement were obtained Based on the test data the effect law of dolomite s moisture content on its shear strength shear parameter deformation properties and failure mode were analyzed The tested results showed that with the increase
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·Natural stone countertops are becoming increasingly widespread with trends and new aesthetic ideas with marble and granite undoubtedly being some of the most favored options But these can be expensive or troublesome to maintain and dolomite offers similar visual appeal with some added longevity benefits But is it a good choice for countertops
A manganoan variety of dolomite but probably only a dolomite with a faint manganese content The type material is lost Iron bearing Dolomite Fe bearing relatively common variety of dolomite Can be distinguished from ankerite only by analytical means Manganese bearing Dolomite A Mn bearing dolomite Mg rich Dolomite
·Under cathodoluminescence crystals often display internal zonation due to varying iron and manganese content Saddle dolomite which may contain hydrocarbon and metal sulfide inclusions is a useful geothermometer indicating minimum burial temperatures of 60° to 150°C equivalent to the oil window
·Figure 7 Dolomite content and order degree of different rock types in the Longwangmiao Formation Sichuan Basin Figure 8 Carbon and oxygen isotopes of different rock types in the Longwangmiao Formation Sichuan Basin Figure 9 Sr isotopes of different
·The dolomite content ranged from 3% to 10% with a mean of 5% Dolomite exhibited two principal forms in the surface lake sediments 1 euhedral 2 10 μm rhombic dolomite mostly scattered in sediments and; 2 sub spherical and spherical dolomite occurring either as dispersed crystals or aggregated into dolomite clusters
·Moreover since the Zn concentration in the reaction products lacks a distinct correlation with proto dolomite content Supplementary Fig 1 it is interpreted to be caused by the presence of
The relative content of dolomite in rocks can be calculated via chemical analysis of the MgO content Therefore we can calculate the dolomite content which ranges from wt% in Table 1 The X ray diffraction results in Table 1 show that the 104 plane net crystal spacing values of dolomite range from Å In sample
·A RCA porosity vs dolomite content from point counting cross plot; B RCA permeability vs dolomite content from point counting cross plot Both demonstrate the negative impact of dolomite cements on porosity and permeability properties only samples with <10% matrix are considered;
·Spheroidal dolomite locally accounts for up to 30% of the total dolomite content and exhibits on average lower concentrations of Sr 15 ± 5 mg/kg similar Mn 400 ± 500 mg/kg contents and
·Lime or dolomite is commonly implemented to ameliorate soil acidity However the impact of dolomite on CO2 emissions from acidic soils is largely unknown A 53 day laboratory study was carried out to investigate CO2 emissions by applying dolomite to an acidic Acrisol rice rapeseed rotation [RR soil] and a Ferralsol rice fallow/flooded rotation [RF soil] Dolomite
3 ·The four samples used in the study exhibited minimal differences in mineral composition with dolomite content consistently above 99% Table 1 Nevertheless significant variations in the concentrations of dissolved Ca 2 and Mg 2 were observed with changes in temperature and pressure This further corroborates the significant influence of
·In this study dolomite crystals are observed in planktonic foraminifera from International Ocean Discovery Program Site U1464 sediments on the Australian Northwest shelf a shallow marine environment <300 m The MgCO 3 content of dolomite was 42 mol % ca 724 mmol/mol calculated based on the d value of the
·The goal of this study is to comprehend the connection between petrographic features especially the grain size of dolomitic rocks and engineering properties Three types of dolomite were selected for this study fine medium and coarse all from the same formation with the same mineral content but varying grain sizes Samples of dolomite from the Rus
·Dolomite CaMg CO 3 2 is an abundant carbonate mineral in ancient rock formations but it is extremely scarce in modern sedimentary 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 to this enigma
