This study concentrates on the latter which contain abundant chlorite-rich layers, commonly rich in magnetite and haematite grains.
The red colour of the dolomite is due to abundant haematite crystallites that grew in the dolomite crystal fabric.
Thus, dolomite vein formation and haematite precipitation were two distinct events, which likely record different conditions.
Rather, haematite precipitation postdated the dolomite and took advantage of the dolomite crystal fabric.
The nodules are dispersed throughout a clay and haematite-rich matrix.
In addition, haematite is commonly present, to locally abundant.
The calcination of haematite from a lower to a higher temperature could be used to monitor the water content in the lattice.
These observations indicate that the dolomite and haematite were not precipitated as two coeval minerals.
