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  • Dolomite Rock Sedimentary Rocks Sandatlas

    Dolomite or dolostone is a carbonate sedimentary rock containing more than 50% by weight of the mineral dolomite.Dolomite rock may contain calcite, but the content of calcite should not exceed 10% of the calcite-dolomite pair’s content 3.. Dolomite in Northern Norway (Trollholmsund) which was once chalk, but the original material has been replaced with dolomite.

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  • Dolomitic sedimentary rocks

    Interpreting Dolomite In Sedimentary Rocks. The Problem of Dolomite Limestone and dolomite are often found together, or closely associated, but their relationships are not always clear. " Pure" dolomite resembles micrite, being a fine-grained carbonate rock with conchoidal fracture, although it can be slightly granular too. But dolomite is a

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  • Sedimentary rock Limestones and dolomites Britannica

    Sedimentary rock Sedimentary rock Limestones and dolomites: Limestones and dolomites are collectively referred to as carbonates because they consist predominantly of the carbonate minerals calcite (CaCO3) and dolomite (CaMg[CO3]2). Almost all dolomites are believed to be produced by recrystallization of preexisting limestones, although the exact details of this dolomitization process

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  • Hydrothermal-sedimentary dolomite — a case from the Middle

    Aug 26, 2020· Occurrence of the sedimentary exhalative rocks and dolostones. The Middle Permian Lucaogou Formation in the study area is composed of a mixed sedimentary succession of tuffaceous dolostone, dolomitic rocks, siltstone and mudstone (Fig. 2a). The sedimentary exhalative rocks that were identified in 26 wells in the Jimusar Sag are the most common geological records of the Permian syn-sedimentary

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  • Rock Types Dolomite

    Mineralogy: Contains a high proportion of dolomite (the mineral and the rock have the same name). Detrital minerals and secondary silica (chert) may be present. Field relations: Dolomites are usually interbedded with other limestone s and are commonly associated salt and gypsium deposits.

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  • Sedimentary rock Carbonate rocks: limestones and

    Carbonate rocks: limestones and dolomites. Limestones and dolostones (dolomites) make up the bulk of the nonterrigenous sedimentary rocks. Limestones are for the most part primary carbonate rocks. They consist of 50 percent or more calcite and aragonite (both CaCO 3).Dolomites are mainly produced by the secondary alteration or replacement of limestones; i.e., the mineral dolomite [CaMg(CO 3) 2

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  • University of Minnesota’s Mineral Pages: Dolomite

    Dolomite forms in hydrothermal veins or as a pore-filling mineral in carbonate rocks, and more rarely as an accessory component in igneous pegmatites or altered mafic igneous rocks. By far though, most dolomite occurs in altered sedimentary marine rocks

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  • Dolomite Rock History Origin Compare Nature

    Dolomite is a sedimentary rock containing more than 50 percent of the mineral dolomite by weight. Dolomite is available in black, brown, colourless, green, grey, pink, white colors. The streak of a rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Dolomite

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  • Dolomites (Chapter 10) Petrology of Sedimentary Rocks

    Secular variations in dolomite abundance during the Phanerozoic remain a controversial topic; see discussion in Machel (2004). Whatever the true story of relative abundance, dolomites are an extremely intriguing group of rocks, and they have considerable economic significance as reservoir rocks for

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  • Hydrothermal-sedimentary dolomite — a case from the Middle

    Occurrence of the sedimentary exhalative rocks and dolostones. The Middle Permian Lucaogou Formation in the study area is composed of a mixed sedimentary succession of tuffaceous dolostone, dolomitic rocks, siltstone and mudstone (Fig. 2a). The sedimentary exhalative rocks that were identified in 26 wells in the Jimusar Sag are the most common geological records of the Permian syn-sedimentary

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  • DOLOMITE (Calcium Magnesium Carbonate)

    Dolomite, which is named for the French mineralogist Deodat de Dolomieu, is a common sedimentary rock-forming mineral that can be found in massive beds several hundred feet thick.They are found all over the world and are quite common in sedimentary rock sequences. These rocks are called appropriately enough dolomite or dolomitic limestone. Disputes have arisen as to how these dolomite

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  • Rock Types Dolomite

    Mineralogy: Contains a high proportion of dolomite (the mineral and the rock have the same name). Detrital minerals and secondary silica (chert) may be present. Field relations: Dolomites are usually interbedded with other limestone s and are commonly associated salt and gypsium deposits.

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  • Limestone Wikipedia

    Limestone is a type of carbonate sedimentary rock.It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO 3).A closely related rock is dolomite, which contains a high percentage of the mineral dolomite, CaMg(CO 3) 2.In old USGS publications, dolomite was referred to as magnesian limestone, a term now reserved for magnesium

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  • Missouri Department of Natural Resources

    The geological definition of limestone is a sedimentary rock consisting of at least 50 percent calcite and dolomite, with less than 50 percent other rock materials. The practical, commercial definition of limestone is a sedimentary rock consisting of 80 percent calcite and dolomite, with less than 20 percent other rock materials.

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  • Sedimentary Rocks Flashcards Quizlet

    T/F: The mineral dolomite, which is the major mineral of the sedimentary rock dolostone, is a carbonate of calcium and magnesium TRUE T/F: The chemical Sed rock, conglomerate, is composed of gravel-sized, rounded, calcite oolites.

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  • Sedimentary Rocks Flashcards Quizlet

    The two major kinds of carbonate sedimentary rocks are _____ and dolomite. limestone _____ is a hard, compact, very fine-grained sedimentary rock composed entirely of silica. Chert. Rock salt is an example of a type of sedimentary rocks called _____ . evaporites.

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