Fine tuning the radiometrically derived Geomagnetic Polarity Time Scale (GPTS) to 0-10 Ma

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doi: 10.1029/94GL03214
Author(s): Baksi, Ajoy K.
Author Affiliation(s): Primary:
Louisiana State University, Department of Geology and Geophysics, Baton Rouge, LA, United States
Volume Title: Geophysical Research Letters
Source: Geophysical Research Letters, 22(4), p.457-460. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0094-8276 CODEN: GPRLAJ
Note: In English. 30 refs.; illus., incl. 2 tables
Summary: New 40Ar/39Ar step-heating ages for geomagnetic field reversals at 3.2 and 4.5 Ma, along with previous data at ∼1, 2, 10 and 16 Ma, are used to derive a geomagnetic polarity time scale for 0-10 Ma. These ages for chron boundaries are fitted to the relative widths of the polarity intervals on the ocean floor, using a cubic spline technique. The interpolated ages of chrons for 0-6 Ma are in good agreement with the astronomical time scale and differ considerably from earlier attempts, based, in part, on K-Ar dates. Significant differences between the interpolated ages and the astronomical time scale are noted for the onset of the Olduvai and Reunion (sub)chrons; there is better agreement if 40Ar/39Ar data obtained from direct dating of these chrons is utilized. This time scale is estimated to be accurate to ±1% for 0-6 Ma; for 6-10 Ma, the lack of a tie-point limits the accuracy to about ±2%.
Year of Publication: 1995
Research Program: ODP Ocean Drilling Program
Key Words: 03 Geochronology; Absolute age; Accuracy; Ar/Ar; Atlantic Ocean; Biotite; Boundary conditions; Brunhes Chron; Cenozoic; Chronostratigraphy; Correlation; Dates; Fish Canyon Tuff; Global; K/Ar; Leg 121; Lower Pleistocene; Magnetostratigraphy; Matuyama Chron; Methods; Mica group; Neogene; Nunivak Event; ODP Site 758; Ocean Drilling Program; Olduvai Subchron; Oligocene; Paleogene; Paleomagnetism; Pleistocene; Quaternary; Reunion Event; Reversals; Sheet silicates; Silicates; South Atlantic; Standardization; Techniques; Tertiary; Time scales; Upper Cenozoic; Upper Quaternary
Coordinates: N052302 N052303 E0902141 E0902140
Record ID: 1995039188
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