EESC07H3 Lecture Notes - Lecture 8: Bone Fracture, Calcite, Aquifer
26 Nov 2016
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Carbonates vs sandstones: characteristics include both 1ary & 2ndary porosity permeability. Substitution of cacium for magnesium in dolomite. Usually 2ndary process, where start with calcium carbonate, then get alteration of calcite. Dolomite can be referred to the mineral but also the rock itself avoid the confusion. Get (cid:271)u(cid:271)(cid:271)li(cid:374)g affe(cid:272)t (cid:449)he(cid:374) add (cid:272)al(cid:272)ite to a(cid:272)id, (cid:449)he(cid:374) add dolo(cid:373)ite to a(cid:272)id, does(cid:374)"t dissolve as readily, somewhat inert. The 2ndary permeability development is much smaller. Chalk is poorly cemented and poorly recrystallized. The pore space of chalk is very small, contribute very little to overall permeability of the material. Bedding planes start off as small fractures & open up chemically to form fissures (by chemical dissolution) Very little co2 in atmosphere, when get chemical dissolution, it is from microorganisms from top layer of the soil. 1) in recharge zone: good development of 2ndary permeability in the recharge zone.
