[1] The causes for discordant radiocarbon results on multiple species of planktonic foraminifera from highsedimentation-rate marine sediments are investigated. We have documented two causes for these anomalous results. One is the addition of secondary radiocarbon for which we have, to date, only one firm example. It involves an opal-rich sediment. The other is the incorporation of reworked mate...

Boron proxies in the calcium carbonate shells of planktic foraminifera are sensitive to seawater acidity, but B/Ca ratios and isotopic composition (i.e., δ11B) recorded by different foraminifer species grown under identical environmental conditions differ significantly systematically. Specifically, Globigerinoides ruber displays higher δ11B than Trilobatus sacculifer Orbulina universa. It has b...

The Southern Ocean plays a prominent role in the Earth's climate and carbon cycle. Changes in the Southern Ocean circulation may have regulated the release of CO₂ to the atmosphere from a deep-ocean reservoir during the last deglaciation. However, the path and exact timing of this deglacial CO₂ release are still under debate. Here we present measurements of deglacial surface reservoir ¹⁴C age c...

During the early Maastrichtian (ca. 71 Ma), important changes occurred in climate, weathering, sea level, biota, and the global carbon cycle. Global climate was characterized by rapid cooling within the long-term post-Santonian refrigeration of high-latitude surface and intermediate waters (Barrera, 1994; Huber et al., 1995). The intensity of continental weathering increased, as inferred from t...

The Gurpi Formation constitutes the source rock for petroleum in the oil-rich South Iranian Basin.Gurpi Formations is well distributed along Zagros Foreland Basin particularly in the north west of the Zagros (Lorestan Province). For Microbiostratigraphy and Paleobathymetric studies of the Gurpi Formation in the central part of Lorestan two stratigraphic sections including Sultan and Amiran sect...

Deep-sea benthic foraminifera live in the largest habitat on Earth, constitute an important part of its benthic biomass, and form diverse assemblages with common cosmopolitan species. Modern deep-sea benthic foraminiferal assemblages are strongly infl uenced by events affecting their main food source, phytoplankton (a relationship known as bentho-pelagic coupling). Surprisingly, benthic foramin...

Abstract. Recent advances in geochemical techniques mean that several robust proxies now exist to determine the past carbonate chemistry of oceans. Foraminiferal δ11B and alkenone carbon isotopes allow us reconstruct sea-surface pH pCO2, respectively, ability apply both same sediment sample would give strongly paired datasets reduce waste. However, no studies date have examined whether solvents...