Oil source rock potential of the lacustrine Jurassic Sim Uuju formation, West Korea Bay Basin. Part 1. Oil source rock correlation and environment of deposition

The offshore West Korea Bay (WKB) Basin is one of several NE-SW rift basins which formed over thick continental crust in Korea and eastern China during the Late Mesozoic and Early Cenozoic, and is characterized by a two-layered structure, with a Cenozoic structure superposed on a pre-Teriary basin. Paraffinic oils recovered from Mesozoic and Tertiary sandstone intervals are thought to have been generated from different source beds. The Sim Ujuu Formation consists mainly of fluvially derived shales and sandstones deposited in a large, open, fresh-water, deep tectonic lake, which occupied wide sub-basins formed by normal faults under a semi-humid climate, as a result of initial rifting during the Upper Jurassic. A probable source bed (400- to 500- m thick) has been geochemically located in the basinal offshore area of the Sim Ujuu sequence penetrated by Well 606. The Jurassic bed could be considered as a potential source for the Mesozoic oil, provided that it contains the right type and amount of organic matter which has reached the stage of oil generation

Ozonisation of humic and fulvic acid (isolated from a lowland river water) and upland water Organic by-products

10.00SIGLEAvailable from British Library Document Supply Centre- DSC:8724.051(WRC-TR--224) / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Lignin turnover in arable soil and grassland analysed with two different labelling approaches

When modelling the carbon dynamics of temperate soils, soil organic carbon (SOC) is often represented by three kinetic pools, i.e. fast, slow and passive/inert. Lignin is often considered to be relatively resistant to decomposition, thus possibly contributing to the passive SOC pool. One way to assess SOC turnover under natural conditions is to follow the fate of 13C-labelled biomass in soils. We used compound-specific isotope analysis to analyse CuO oxidation products of lignin from grassland topsoils and from an arable topsoil that had received a natural (by C3-C4 vegetation change) or an artificial (by fumigation with labelled CO2) isotopic label for 9–23 years. Results indicate faster apparent turnover for lignin (5–26 years in grassland, 9–38 years in arable soil) compared with bulk SOC (20–26 years in grassland, 51 years in arable soil). Although these calculated lignin turnover times cannot be extrapolated to the whole soil profiles, this paper provides isotopic evidence that lignin in soils is not preferentially preserved, which is a consistent result from both ways of isotopic labelling. It also demonstrates, however, that a considerable proportion of lignin in temperate soils can be stabilized for at least a few decades