Samples display a range of both allochthonous terrestrial and relatively autochthonous marine matter.
Both allochthonous terrestrial and relatively autochthonous marine matter were recovered, with results showing a progressive fining of material from proximal to distal areas.
The plot of δ¹³C values of aliphatic and aromatic hydrocarbon fractions of the oils (Chung et al. 1992) examined in this study show their sources have originated from a similar organic marine matter (Fig. 6).
High C19 C20 C21 tricyclic terpanes indicate that organic matter derived from a terrestrial origin (Ozcelik and Altunsoy 2005), high C23 tricyclic terpane indicates a high contribution of marine matter (Ourisson et al. 1982), and C24 tetracyclic terpane was mainly sourced from terrestrial OM input (Philp and Gilbert 1986).
These sediments consist of a series of sands and clays deposited on decaying organic marine matter, that over time, transformed into oil and natural gas.
The number of copepods, marine crustaceans, matters to many other animals.
However, marine particulate matters are characterized by low OC (0.5−3%), low OC/TN ratio (6 12), and variable δ13C (−28 to −16‰).
An increase in δ13C and a decrease in OC in BS1 (40 45 cm), BS3 (below 35 cm), BS4 (below 30 cm), IS2 (25 35 cm), and IS3 (0–25 cm) may be due to large variability in chemistry and increased susceptibility of marine organic matter than the terrestrial/plant organic matter (Hedges et al. 1997).
The Kapuas Kecil River, one of the two branches in the lower reach of the Kapuas River, showed higher levels and diagenesis of sedimentary organic matter due to input from anthropogenic sources and increased marine organic matter near the mouth.
Furthermore, the Mississippi River disperses large amounts of terrestrial organic matter and nutrients, resulting in increased primary productivity, whereby marine organic matter is produced that will sink to the seafloor and can serve as food for the cold-water corals and associated species.
