A new high-precision 40 Ar/39 Ar age for the Rochechouart impact structure: At least 5 Ma older than the Triassic-Jurassic boundary
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A new high-precision Ar/Ar age for the Rochechouart impact structure: At least 5 Ma older than the Triassic–Jurassic boundary
The Rochechourt impact structure in south-central France, with maximum diameter of 40–50 km, has previously been dated to within 1% uncertainty of the Triassic– Jurassic boundary, at which time ~30% of global genera became extinct. To evaluate the temporal relationship between the impact and the Triassic–Jurassic boundary at high precision, we have re-examined the structure’s age using multicol...
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Introduction: The age of the ~23 km in diameter Rochechouart impact structure, France, hosted by Precambrian to Paleozoic (Variscan) crystalline rocks of the northwestern French Massif Central, has long time been a matter of debate. Previous studies, including K-Ar, Rb-Sr, apatite and glass fission track, as well as paleomagnetic dating (see [1] for summary of ages), resulted in a broad (Middle...
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ژورنال
عنوان ژورنال: Meteoritics & Planetary Science
سال: 2017
ISSN: 1086-9379
DOI: 10.1111/maps.12880