Geological study of active cold seeps in the syn-collision accretionary prism Kaoping Slope off SW Taiwan
Journal
Terrestrial, Atmospheric and Oceanic Sciences
Journal Volume
17
Journal Issue
4
Pages
679-702
Date Issued
2006
Author(s)
Abstract
Pogonophoran tube worms, elongated pyrite tubes and authigenic carbonate nodules are used to evaluate the occurrence of potential cold seeps in the syn-collision accretionary prism Kaoping Slope off SW Taiwan. At least two species of pogonophoran tubeworms were found in surface and core sediments. Pyrites occur in three different forms: fillings inside foraminiferal chambers, cements between calcareous microfossils, and elongated tubes. The bottom water off SW Taiwan is aerobic, but authigenic pyrites are found in the surface sediments at several sites, suggesting the existence of local reducing environments enabling the formation of pyrites. These environments are most likely caused by the occurrence of active cold seeps where methane expulses. Authigenic carbonates with highly depleted carbon isotope values (-54 to -43 0 00) were found at more than 5 locations, in agreement with a methane-derived source for the carbon.
SDGs
Type
journal article