limestone and granite
Usually carbonate rocks like limestone or dolomite.
Skarn is metamorphic.
Limestone can metamorphose into marble, a regional metamorphic rock, or into skarn, a contact metamorphic rock.
Limestone doesn't normally have a parent rock. One exception to this may be a detrital limestone, whose parent rock would however also be limestone!
Minerals commonly present within skarn rocks include garnet, magnetite and epidote.
Slate, gneiss, skarn, phyllite, amphibolite, schist, quartzite, marble, and granulite are all metamorphic rocks.
The metamorphosed limestone will most likely be a skarn or marble, both formed from contact with an intruding granitic magma.
Skarns are most often formed at the contact zone between intrusions of granitic magma bodies and carbonate sedimentary rocks such as limestone and dolostone.
David A John has written: 'Grade and tonnage model of tungsten skarn deposits, Nevada' -- subject(s): Ore deposits, Tungsten ores, Skarn
Marble rock is made when a sedimentary rock, which consists of limestone has undergone heat and pressure metamorphosis under temperatures in excess of 1800ºF.
Gail Elizabeth Bloomer has written: 'Geology, mineralogy, and geochemistry of the iron crown calcic iron skarn deposit, Vancouver Island, British Columbia' -- subject(s): Geology, Geochemistry, Skarn, Mineralogy