Paleotemperature variations of Early Jurassic seawater recorded in geochemical trends of belemnites from the Basque–Cantabrian basin, northern Spain

ROBLES, Sergio; Quesada, Santiago; Rosales, Idoia

doi:10.1016/S0031-0182(03)00686-2

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Paleotemperature variations of Early Jurassic seawater recorded in geochemical trends of belemnites from the Basque–Cantabrian basin, northern Spain

Author(s): Idoia Rosales , Santiago Quesada , Sergio Robles

Publication date Created: February 2004

Publication date (Print): February 2004

Journal: Palaeogeography, Palaeoclimatology, Palaeoecology

Publisher: Elsevier BV

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87Sr/86Sr, δ13C and δ18O evolution of Phanerozoic seawater

Jan Veizer, Davin Ala, Karem Azmy … (1999)

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Cenozoic deep-Sea temperatures and global ice volumes from Mg/Ca in benthic foraminiferal calcite

Lear, Elderfield, Wilson (2000)

A deep-sea temperature record for the past 50 million years has been produced from the magnesium/calcium ratio (Mg/Ca) in benthic foraminiferal calcite. The record is strikingly similar in form to the corresponding benthic oxygen isotope (delta(18)O) record and defines an overall cooling of about 12 degrees C in the deep oceans with four main cooling periods. Used in conjunction with the benthic delta(18)O record, the magnesium temperature record indicates that the first major accumulation of Antarctic ice occurred rapidly in the earliest Oligocene (34 million years ago) and was not accompanied by a decrease in deep-sea temperatures.