When I ground the rock into powder , I found that it contained many veins of carbonate.I wonder if these hydrothermal veins have any effect on the organic carbon isotopes of the rocks
The accumulation of CaCO3 in the subsurface environment as nodules or cemented horizons, has proven valuable in paleoenvironmental studies because of its high preservation potential and common association with soil-forming processes in semiarid climates.
In addition to climate, however, the morphology and maturity of all paleosols, including those that are calcareous, are controlled by a variety of factors, such as the sediment accumulation rate, which controls the residence time of sediment in the soilforming
environment, vegetative cover, subsurface biotic activity, and host sediment composition.