Light δ13C events during deglaciation of the East Greenland Continental Shelf attributed to methane release from gas hydrates

Autor:	A. E. Jennings, L. M. Smith, A. deVernal, David M. Anderson, Julian P. Sachs
Rok vydání:	2001
Předmět:	geography geography.geographical_feature_category biology Continental shelf Clathrate hydrate biology.organism_classification Seafloor spreading Foraminifera Paleontology Geophysics Oceanography Paleoclimatology Deglaciation General Earth and Planetary Sciences Ice sheet Meltwater Geology
Zdroj:	Geophysical Research Letters. 28:2217-2220
ISSN:	0094-8276
Popis:	We have documented high-resolution stable isotope records from three marine cores on the East Greenland shelf. These records exhibit three rapid light δ13C events (−3 to −7‰) in benthic and planktic foraminifera during deglaciation that are spatially and temporally transgressive. The light δ13C events are associated with light planktic δ18O, indicative of meltwater. In Kangerlussuaq Trough, the first δ13C event occurs at initial deglaciation, 13.94–14.0 cal ka and the second occurs at 12.85–12.9 cal ka. A younger event at 10.3–9.3 cal ka is recorded near the mouth of Nansen Fjord during final deglaciation. The hypothesized mechanism for the light δ13C is expulsion of methane from gas hydrates in the seafloor from pressure release during ice sheet retreat.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c303b634d2010895d2bdb3c8af6a3cde https://doi.org/10.1029/2000gl012627 Zobrazit plný text záznamu Plný text