Sedimentology and geochemistry of the Iberian margin ...
The Portuguese margin is well-suited for studies of the contrasts in North Atlantic circulation during glacial and interglacial times because of its rapid sediment accumulation rate. This paper reports a (230Thexcess)0-based study of sediment accumulation over the past 140 ky, a period which include...
| Main Authors: | , , , , , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
PANGAEA
1999
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.1594/pangaea.735613 https://doi.pangaea.de/10.1594/PANGAEA.735613 |
| Summary: | The Portuguese margin is well-suited for studies of the contrasts in North Atlantic circulation during glacial and interglacial times because of its rapid sediment accumulation rate. This paper reports a (230Thexcess)0-based study of sediment accumulation over the past 140 ky, a period which includes the last two glacial/interglacial transitions, in two cores at 2.4 and 3.5 km water depth on a slope transect at 40°N. Although the independently-determined mean sediment accumulation fluxes over the past 140 ky are unequivocally high with means of 13.2 and 10.5 g cm**-2 ky**-1 in the two cores, conventional application of the (230Thexcess)0 method yields consistently lower fluxes with means of 3.5 and 3.8 g cm**-2 ky**-1. These (230Thexcess)0 estimates are interpreted as representations of the regional depositional flux through time. This (230Thexcess)0 regional flux is composed of a carbonate flux of <1 g cm**-2 ky**-1and a larger and variable clay input which indicates the importance of the sea level ... : Supplement to: Thomson, John; Nixon, S; Summerhayes, Colin P; Schönfeld, Joachim; Zahn, Rainer; Grootes, Pieter Meiert (1999): Implications for sedimentation changes on the Iberian margin over the last two glacial/interglacial transitions from (230Th-excess)0 systematics. Earth and Planetary Science Letters, 165(3-4), 255-270 ... |
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