â‰¥3700Ma pre-metamorphic dolomite formed by microbial .dence for the formation of low-temperature pre-metamorphic dolomite in Isua prior to . metamorphism) dolomite in Isua sedimentary rocks and pillow interstices.dolomite in metamorphic rock,Metamorphic RocksMarble is metamorphosed line or dolomite. Both line and dolomite have a large concentration of calcium carbonate (CaCO3). Marble has many.
dolomite in metamorphic rock