Evaluation of the astronomical time scale for the Paleocene and earliest Eocene

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doi: 10.1016/j.epsl.2010.09.044
Author(s): Hilgen, Frederik J.; Kuiper, Klaudia F.; Lourens, Lucas J.
Author Affiliation(s): Primary:
Utrecht University, Department of Earth Sciences, Utrecht, Netherlands
Volume Title: Earth and Planetary Science Letters
Source: Earth and Planetary Science Letters, 300(1-2), p.139-151. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X CODEN: EPSLA2
Note: In English. 45 refs.; illus., incl. 3 tables, strat. cols.
Summary: The astronomical-tuned time scale is rapidly extended into the Paleogene but, due to the existence of an Eocene gap, different tuning options had to be presented for the Paleocene. These options differ both in number and tuning of ∼405-kyr eccentricity related cycles and are only partially consistent with recalculated 40Ar/39Ar constraints for the Cretaceous/Paleogene (K/Pg) and Paleocene/Eocene (P/E) boundaries. In this paper, we evaluate the cyclostratigraphic interpretation of records from ODP Leg 198 and 208 sites, and the Zumaia section to solve the problem of the different tuning options. We found that the interval between the K/Pg boundary and the early Late Paleocene biotic event (ELPE) comprises 17 instead of 16×∼405-kyr eccentricity related cycles as previously proposed, while the entire Paleocene contains 25×∼405-kyr cycles. Starting from 40Ar/39Ar age constraints for the K/Pg boundary, a new tuning to 405-kyr eccentricity is presented for the Paleocene and earliest Eocene, which results in ages of ∼66.0 and ∼56.0 Ma for the K/Pg and P/E boundaries, respectively. This tuning introduces considerable differences in age for a number of nannofossil events at ODP Sites 1209 and 1262 in the interval between 61 and 63 Ma, but eliminates large and abrupt changes in the seafloor spreading rate. The tuning seems further consistent with recalculated 40Ar/39Ar ages for ash layer -17 of early Eocene age. However, despite this apparent consistency with existing radio-isotopic constraints, an alternative 405-kyr younger or, less likely, older tuning cannot be excluded at this stage. Abstract Copyright (2010) Elsevier, B.V.
Year of Publication: 2010
Research Program: ODP Ocean Drilling Program
Key Words: 03 Geochronology; 12 Stratigraphy, Historical Geology and Paleoecology; Absolute age; Alkali feldspar; Ar/Ar; Atlantic Ocean; Cenozoic; Climate forcing; Cretaceous; Cyclic processes; Cyclostratigraphy; Dates; Eccentricity; Eocene; Europe; Feldspar group; Framework silicates; Iberian Peninsula; K-T boundary; Leg 198; Leg 208; Lower Paleocene; Mesozoic; North Pacific; Northwest Pacific; ODP Site 1209; ODP Site 1210; ODP Site 1211; ODP Site 1262; ODP Site 1267; Ocean Drilling Program; Orbital forcing; Pacific Ocean; Paleocene; Paleocene-Eocene Thermal Maximum; Paleocene-Eocene boundary; Paleogene; Sanidine; Shatsky Rise; Silicates; South Atlantic; Southern Europe; Spain; Stratigraphic boundary; Tertiary; Upper Cretaceous; Walvis Ridge; West Pacific; Zumaia Spain
Coordinates: N431726 N431726 W0021448 W0021448
N323900 N324000 E1583100 E1583000
N321300 N321300 E1581600 E1581600
S271100 S271100 E0013500 E0013400
Record ID: 2011034407
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands