Geochronology and paleothermometry of Neogene sediments from the Vøring Plateau using Sr, C and O isotopes

Details Geochronology and paleothermometry of Neogene sediments from the Vøring Plateau using Sr, C and O isotopes Geochronology and paleothermometry of Neogene sediments from the Vøring Plateau using Sr, C and O isotopes

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..78..368s&link_type=abstract

Earth and Planetary Science Letters, Volume 78, Issue 4, p. 368-378.

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The Neogene sediments from DSDP site 341 on the Vøring Plateau, Norwegian Sea, contain a thin glauconitic pellet-bearing subunit, which separates underlying pelagic clays from overlying glacial-marine sediments. Oxygen isotope measurements of benthic foraminifera show a δ18O shift of + 1%. during deposition of this subunit, probably a combined effect of a drop in bottom water temperature and a rise in seawater δ18O. The chronology of this sedimentological and O isotope transition is, however, poorly constrained by fossil evidence.
Rb-Sr dating of glauconitic pellets indicates that the lower part of the glauconitic subunit was deposited 11.6 +/- 0.2 Ma ago. Further geochronological evidence, derived from the Sr and C isotopic compositions of foraminifera compared with known seawater-time variations, indicates that the lower pelagic clays are early to middle Miocene, deposited at a mean rate of ~ 15 m/Ma. The glauconitic subunit contains part of the middle Miocene and probably all of the late Miocene in a condensed sequence with a very low mean depositional rate (~ 0.2 m/Ma). The overlying glacial marine sediments are probably Pliocene, with a high mean rate of deposition, ~ 45 m/Ma.
This is the first application of C, O and Sr isotopic stratigraphy combined with Rb-Sr dating of glauconitic minerals, and it illustrates the applications of this integrated approach in geochronology.

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