Dolomitization


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dolomitization

[‚dō·lə·məd·ə′zā·shən]
(geology)
Conversion of limestone to dolomite rock by replacing a portion of the calcium carbonate with magnesium carbonate.

Dolomitization

 

the process of enriching calcareous silt (sediment) or limestone with dolomite through the substitution of MgCO3 for part of the CaCO3. There are two types of dolomitization: diagenetic, which occurs in silt during the process of its conversion into sedimentary rock, and epigenic, which occurs in already solidified limestone. Epigenic dolomitization is caused by the action of subterranean waters enriched with magnesium, as they pass through strata of dolomite, ultrabasic igneous rock, and so forth. A complete substitution of dolomite for the calcite rarely oc-curs with these secondary limestone changes. Usually dolomitized limestones are formed.

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4d) suggests a decrease in the content of iron minerals during dolomitization of carbonate rocks and redistribution of iron minerals during dolomite cementation of siliciclastic rocks (Fig.
Burrow-facilitated dolomitization is evident in the Ordovician Tyndall Limestone (Red River Group, Selkirk Formation).
These forward-looking statements include the statements that: this well will test an identified primary objective in the Devonian Wabamun formation at a depth of approximately 2800 metres (9180 feet); Dolomitization of the Wabamun is clearly associated with faulting at Saddle Hills and it is expected the case will be the same at Woking; and this prospect is one of the Company's high-impact exploration projects, and has significant production and reserves potential similar to that of Saddle Hills.
Dissolution porosity and late diagenetic dolomitization may have enhanced the secondary porosity to a greater level.
Kiipli (1983) noted a link between the dolomitization of the Pae Member (and occasionally lithologies below and above) and fracture zones.
The OS layers have only locally slightly changed in the diagenetic processes, whereas the barren limestone interlayers are strongly enriched with MgO and depleted of CaO that is caused by diagenetic dolomitization.
Hydrothermal dolomitization in the Lower Silurian La Vieille Formation in northern New Brunswick: geological context and significance for hydrocarbon exploration.
The dolomite crystals are may be formed either due to marine environment changing from deep to shallow water with increasing salinity (Murray, 2007; Folk and Lands, 1975), or may owe to secondary diagenetic processes of dolomitization initiated shortly after the deposition (Wenk and Bulakh, 2008; Al-Aasm,2003; Baker and Kastiner 1988).
Late Pleistocene mixing zone dolomitization, southeastern Barbados, West Indies, Sedimentology, 35: 327-348.