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Radioisotopic dating of the Tortonian Global Stratotype Section and Point: implications for intercalibration of 40 Ar/ 39 Ar and astronomical dating methods
Author(s) -
Kuiper Klaudia F.,
Wijbrans Jan R.,
Hilgen Frederik J.
Publication year - 2005
Publication title -
terra nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.353
H-Index - 89
eISSN - 1365-3121
pISSN - 0954-4879
DOI - 10.1111/j.1365-3121.2005.00625.x
Subject(s) - stratotype , sanidine , geology , radiometric dating , paleontology , global boundary stratotype section and point , canyon , geochronology , biotite , biostratigraphy , geomorphology , stage (stratigraphy) , quartz
In this paper we present new 40 Ar/ 39 Ar data of volcanic ash layers intercalated in the astronomically dated sections of Monte dei Corvi and Monte Gibliscemi (Italy) to obtain better radioisotopic time constraints on the Serravallian/Tortonian boundary and to confirm the intercalibration of radioisotopic and astronomical time proposed by Kuiper et al. [2004; Fish Canyon Tuff (FCT)‐sanidine at 28.21 ± 0.03 Ma]. The latter intercalibration is supported by astronomically calibrated FCT sanidine ages for two ash layers at Monte Gibliscemi (GiF‐1: 28.28 ± 0.04; GiD‐3: 28.16 ± 0.04 Ma; ±1 SE). As a consequence, our results support the astronomically calibrated age of 11.608 Ma for the Tortonian Global Stratotype Section and Point and, hence, the tuning of the Serravallian/Tortonian boundary interval. The Ancona and Respighi levels at Monte dei Corvi give a more diffuse picture, possibly because of contamination with detrital or xenocrystic material and the inferior quality of biotite for intercalibration purposes.