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• W1972503057 abstract "The present study examines, at high-resolution, the biogeochemical cycling of organic carbon (OC), nutrients, sulphur, and a broad suite of trace metals in the uppermost sediments collected at Site 1002 in the Cariaco Basin during Ocean Drilling Program Leg 165 (Sigurdsson et al., 1997). Our primary goal was to evaluate variability in coupled organic-inorganic geochemical systems within the context of temporal palaeoredox gradients and their palaeoceanographic controls. The relevant deposits span almost 8 m of depth and record the oxic conditions present during the last glacial lowstand, the anoxic regime that has persisted throughout the Holocene, and the productivity-driven transition from oxic to anoxic deposition at roughly 12.6 ka. Background. The Cariaco Basin, a pull-apart basin located on the northern continental shelf of Venezuela, is the world's second largest modem anoxic basin. Lateral exchange of waters with the Caribbean is limited by sills that currently come to within 150 m of the sea surface, and the basin is presently anoxic below 300 m water depth (Peterson et al., 1991). Although longer-term records indicate oscillations between oxic and anoxic conditions over the last 500 ka, the basin has been permanently anoxic for the last 12.6 ka. Results from a complementary high-resolution biogeochemical study have revealed significant changes in productivity, nutrient cycling, and planktonic community structure as a direct result of variability in upwelling in the Cariaco associated with abrupt changes in global climate over the last 12.6 ka (Weme et al., 1998). Despite increasing strength in the marine connection with the rise of sea level, the basin switched from oxic to anoxic conditions at roughly 12.6 ka with the increase in Ekman-induced upwelling that characterized the cooler Younger Dryas (12.6 to 11 ka) [Peterson et al., 1991]. Climatic patterns in the Cariaco Basin, both seasonal and longer term, have been linked to north-south excursions of the Intertropical Convergence Zone (ITCZ). During cool periods such as the Younger Dryas, the ITCZ occupies a more southerly average position leading to increased trade wind strength and correspondingly greater upwelling intensity and productivity. The transition to anoxic conditions marks the increase in OC loading and concomitant respiratory consumption of Oz and is characterized by abrupt increases in the accumulation of OC and biogenic opal, as well as foraminiferal indicators of increased productivity (Peterson et al., 1991). Geochemical parameters, such as temporal patterns for 6180, 613C, and 615N for organic and inorganic species, faithfully record the dynamic balance between upwelling intensity and nutrient utilization by biological productivity over the last 12.6 ka (Weme et aL, 1998), Furthermore, molecular biomarker analyses have illuminated the variability in the planktonic ecosystem associated with climatic and oceanographic changes over the same time period. The recognition of climatically forced" @default.
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• W1972503057 date "1998-01-01" @default.
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• W1972503057 title "Biogeochemical Pathways in Holocene and Latest Pleistocene Sediments of the Anoxic Cariaco Basin: Linkages to Palaeoceanographic and Palaeoclimatic Variability" @default.
• W1972503057 doi "https://doi.org/10.1180/minmag.1998.62a.2.156" @default.
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