How is dolostone formed?
One process by which dolostone can be formed is by means of direct precipitation of calcium magnesium carbonate from seawater. Another process is for dolomite to slowly replace the calcite of limestone after the limestone has been deposited. In either case, dolostone has more of the element magnesium than calcium.
What classification is dolostone?
It is a calcium magnesium carbonate with a chemical composition of CaMg(CO3)2. It is the primary component of the sedimentary rock known as dolostone and the metamorphic rock known as dolomitic marble….
|Physical Properties of Dolomite|
|Mohs Hardness||3.5 to 4|
|Specific Gravity||2.8 to 2.9|
What are the steps of Lithification?
What are the steps of lithification? Sedimentary rocks are the product of 1) weathering of preexisting rocks, 2) transport of the weathering products, 3) deposition of the material, followed by 4) compaction, and 5) cementation of the sediment to form a rock. The latter two steps are called lithification.
Is dolostone a clastic sedimentary rock?
Dolomite (also known as “dolostone” and “dolomite rock”) is a chemical sedimentary rock that is very similar to limestone. It is thought to form when limestone or lime mud is modified by magnesium-rich ground water.
How does dolostone differ from limestone and how does dolostone form?
How does dolostone differ from limestone, how does dolostone form? Dolostone is a carbonate rock that doesn’t contain calcite, rather it contains dolomite. Dolostone forms as a chemical reaction between solid calcite and magnesium groundwater.
How do I identify a dolostone?
Dolostone is quite similar to limestone, but is composed mostly of the mineral dolomite (CaMg(CO3)2). Both are sedimentary rocks that occur as thin to massive beds of fine- to coarse-grained rock. Their color is typically some shade of gray, but may be white, tan, yellow, pink, purple, reddish brown, brown, or black.
What are the 3 steps for lithification?
Lithification is the process of turning loose rock material into hard rock through evaporation, compaction and cementation.
How does cementation happen?
cementation, in geology, hardening and welding of clastic sediments (those formed from preexisting rock fragments) by the precipitation of mineral matter in the pore spaces. It is the last stage in the formation of a sedimentary rock.
Is dolostone a chemical sedimentary rock?
Carbonate rocks include limestone, which is made of calcite (CaCO3), and dolostone , which is made of dolomite (CaMg(CO3)2). Evaporites are chemical sedimentary rocks.
How does dolostone differ from limestone?
The principal mineral of limestone is calcite (CaCO3), a form of calcium carbonate. Dolostone is quite similar to limestone, but is composed mostly of the mineral dolomite (CaMg(CO3)2). By contrast, dolostone is less reactive and normally must be in powdered form to react visibly.
What type of rock is granodiorite?
Granite and granodiorite are intrusive igneous rocks that slowly cool deep underground in magma chambers called plutons.
Is it dolostone or dolomite?
The term dolostone, proposed to specifically refer to the rock type composed of the mineral dolomite, has not gained wide usage, and sedimentary petrologists continue to habitually use the term dolomite for both the rock and the mineral.
Why are limestone and dolostone collectively referred to as carbonates?
Limestone and dolostone are collectively referred to as carbonates because these two sedimentary rock types consist mainly of the minerals calcite (CaCO3 ), aragonite (CaCO 3 ), and dolomite [CaMg (CO 3) 2 ].
What is a dolostone and what is it used for?
Dolostones are typically a product of diagenetic recrystallization of limestone and are at best a last resort for oxygen isotope stratigraphy.
What is a diagenetic dolostone?
Dolostones are typically a product of diagenetic recrystallization of limestone and are at best a last resort for oxygen isotope stratigraphy. Frederick L. Schwab, in Encyclopedia of Physical Science and Technology (Third Edition), 2003