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Positive correlation between organic matter content and clay content in Lucaogou siltstones supports this view point.
We interpret this as an indication of a relationship between mineral surface reactivity and organic matter composition.
The results show that organic matter interactions with clay mineral surfaces determine the accessibility of specific organic matter components at the soil–water interface.
The maturation of the organic matter is independent with respect to the mineralogical context and aqueous alteration.
Applying these results to maturation of organic matter in natural environments, we suggest that a given type of organic matter associated with different minerals in source rocks will yield different products.
We suggest that the nature of the organic matter and its interaction with mineral surfaces are as important as the amount present.
organic matter and calcite, which are in excellent agreement with the results in the literature.
All these effects diminish as pebbles become more embedded in the soil.
SEM photographs indicate that the pebbles have porous structure and small grain size.