A study of the soluble and insoluble organic matter from the Livello Bonarelli,a Cretaceous black shale deposit in the Central Apennines,Italy |
| |
Authors: | Ger van Graas TC Viets JW de Leeuw PA Schenck |
| |
Institution: | Delft University of Technology, Department of Chemistry and Chemical Engineering, Organic Geochemistry Unit, De Vries van Heystplantsoen 2, 2628 RZ Delft, The Netherlands |
| |
Abstract: | Pyrolysis-mass spectrometry of extracted sediments from the Livello Bonarelli, a thinly laminated carbonate-poor sedimentary unit at the Cenomanian-Turonian boundary, indicates significant differences between the samples. Microscopic investigations and pyrolysis-gas chromatography show a main contribution from marine organic matter for all samples. The composition of the extractable hydrocarbons becomes more complex with increasing organic carbon content of the sediments, indicating increasing anoxicity in the environment of sedimentation.Organic geochemical analyses combined with sedimentological and paleontological data show that the Livello Bonarelli could have been deposited in a paleoenvironment similar to that recently proposed for the Pleistocene Mediterranean sapropels, with an intermittent influx of fresh water leading to stagnation and a high productivity of marine organic matter caused by the transported nutrients. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|