Publication Date:
2023-06-27
Description:
Pleistocene sediments in the Guaymas Basin, Gulf of California, have been intruded by sills and their organic matter thus subjected to thermal stress. Sediment samples from DSDP/IPOD Sites 477, 478, and 481, and samples of thermally unaltered materials from Sites 474 and 479 were analyzed to characterize the lipids and kerogens and to evaluate the effects of the intrusive thermal stresses. The lipids of the thermally unaltered samples are derived from microbial and terrestrial higher-plant detritus. The samples from the sill proximities contain the distillates, and those adjacent to the sills contain essentially no lipids. The pyrograms of the kerogens from the unaltered samples reflect their predominantly autochthonous microbial origin. When compared with the unaltered samples, the pyrograms of the altered kerogen samples reflect the thermal effects by a reduction in the complexity of the products. Kerogens adjacent to the sills produced little or no pyrolysis products. The effects of intrusions into unconsolidated, wet sediments resulted in in situ pyrolysis of the organic matter, as confirmed by these data.
Keywords:
64-477; 64-477A; 64-478; 64-479; 64-481; 64-481A; Calcium carbonate; Carbon, organic, total; Carbon, total; Carbon/Nitrogen ratio; Carbon Preference Index, fatty acids; Carbon Preference Index, n-Alkanes; Comment; Deep Sea Drilling Project; Depth, reconstructed; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elevation of event; Epoch; Event label; Fatty acids; Gas chromatography - Mass spectrometry (GC-MS); Glomar Challenger; Latitude of event; Leg64; Lipids, total; Lithology/composition/facies; Longitude of event; n-Alkane, total per unit sediment mass; North Pacific/Gulf of California/BASIN; North Pacific/Gulf of California/CHANNEL; Phytane; Position; Pristane; Pristane/Phytane ratio; Sample code/label; Sample code/label 2; Yield
Type:
Dataset
Format:
text/tab-separated-values, 503 data points
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