Covariance of C- and O-isotopes with magnetic susceptibility as a result of burial diagenesis
of sandstones and carbonates: an example from the Lower Devonian La Vid Group, Cantabrian Zone, NW Spain.
2002; Yudovich, 2003a) no son atribuibles a la bioquimica de las plantas vivas que dan origen a los carbones, sino mas bien asociadas a procesos posteriores, posiblemente durante la diagenesis
del material organico (Bernstein, 1985).
The positron annihilation signal observed in the opals is affected by the phase of diagenesis
(maturity) and the degree of dehydration of opals.
Although there are several interpretations of the origin of the cinnabar-bearing deposits, it is widely accepted that the cinnabar-forming materials are mainly derived from the Hg-rich carbonate and black shale deposited in marine environments, and that the Hg mineralization took place during diagenesis
, as a byproduct of post-depositional geochemical and physical processes.
The dating of ancient bones has been notably unreliable because of diagenesis
and isotopic contamination that occur with millennia of environmental exposure.
The light may be less accessible to the surface as permeability in the structure changes, porosity decreases, and permeability changes during early diagenesis
(Warren, 1988, 1999).
Molecular taphonomy of animal and plant cuticles: selective preservation and diagenesis
A relative sea-level fall exposed the upper portion of the succession to meteoric diagenesis
and soil development (Haywick and Kopaska-Merkel, in prep.
ADNOC's publication (ADNOC News, March 1999) said preservation of porosity was "possibly attributed to initial deposition environment, subsequent diagenesis
and associated ever-pressuring".
The fluids also play an important role in the deformational, thermal, and chemical evolution of subduction zones, and enhance sediment diagenesis
and rock metamorphism.
Among the subjects are the aspects of living processes, chemical composition and characteristics of biological material, origin of life, role of microorganisms in weathering of rocks and the early diagenesis
of sediments, and the origin of petroleum, oil shale.
Interplay between Holocene sedimentation and diagenesis
, and implications for hydrocarbon exploitation: return to the sabkha of Ras Umm Said, Qatar (Shinn, E.