SST Proxies Chilean (ODP Leg 202 Site 1235 and Site 1234) and Angola Margin (ODP Leg 175 Site 1078 and Site 1079) ...

The TEX86 paleothermometer has been extensively used to reconstruct past sea water temperatures, but it remains unclear which export depths the proxy represents. Here we used a novel approach to better constrain the proxy recording depths by investigating paleotemperature proxies (TEX86, UK'37, RI-OH and RI-OH') from two pairs of proximal (< 12 km apart) cores from Chilean and Angola margin, respectively. These cores are from steep continental slopes and lower shelves, which leads to a substantial difference in water depth between them despite being closely located. Surprisingly, the deep a... Mehr ...

Verfasser: Varma, Devika
Hättig, Katrin
van der Meer, Marcel T J
Reichart, Gert-Jan
Schouten, Stefan
Dokumenttyp: Artikel
Erscheinungsdatum: 2023
Verlag/Hrsg.: PANGAEA
Schlagwörter: Alkenones / GDGTs / OH-GDGTs / SST / NIOZ Royal Netherlands Institute for Sea Research / and Utrecht University NIOZ_UU / Ocean Drilling Program ODP
Sprache: Englisch
Permalink: https://search.fid-benelux.de/Record/base-29160276
Datenquelle: BASE; Originalkatalog
Powered By: BASE
Link(s) : https://dx.doi.org/10.1594/pangaea.957090

The TEX86 paleothermometer has been extensively used to reconstruct past sea water temperatures, but it remains unclear which export depths the proxy represents. Here we used a novel approach to better constrain the proxy recording depths by investigating paleotemperature proxies (TEX86, UK'37, RI-OH and RI-OH') from two pairs of proximal (< 12 km apart) cores from Chilean and Angola margin, respectively. These cores are from steep continental slopes and lower shelves, which leads to a substantial difference in water depth between them despite being closely located. Surprisingly, the deep and the shallow UK'37 records at the Chilean margin shows dissimilarities, in contrast to the similar records from the Angola margin, which may be due to post-depositional alteration at the former sites. In contrast, the TEX86 records were statistically indistinguishable between the sites at both the locations, even though the GDGT [2]/[3] ratio suggests GDGTs derived from potentially different archaeal communities ...