40Ar-39Ar age of Northwest Africa 091: More evidence for a link between L chondrites and fossil meteorites
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چکیده
منابع مشابه
Astronomically calibrated 40Ar/39Ar age for the Toba supereruption and global synchronization of late Quaternary records.
The Toba supereruption in Sumatra, ∼74 thousand years (ka) ago, was the largest terrestrial volcanic event of the Quaternary. Ash and sulfate aerosols were deposited in both hemispheres, forming a time-marker horizon that can be used to synchronize late Quaternary records globally. A precise numerical age for this event has proved elusive, with dating uncertainties larger than the millennial-sc...
متن کامل40Ar/39Ar geochronology of the Eocene Green River Formation, Wyoming
The deposits of Eocene Lake Gosiute that constitute the Green River Formation of Wyoming contain numerous tuff beds that represent isochronous, correlatable stratigraphic markers. Tuff beds selected for 40Ar/39Ar analysis occur within laminated mudstone, are matrix supported, and lack evidence of reworking. These tuffs contain 2%–15% euhedral phenocrysts of quartz, plagioclase, sanidine, biotit...
متن کاملTemperatures on Mars from 40Ar/39Ar thermochronology of ALH84001
The thermal history of Martian meteorite ALH84001 has critical implications for its petrological and deformational history, the age of its trapped atmospheric gases, the timing of the Martian dynamo, and possibly the evolution of Martian surface temperatures during the last 4 billion years (Gyr). Feldspathic glass in ALH84001 has been dated using 40K/40Ar and 40Ar/39Ar chronometry by several la...
متن کاملThe case for a younger Imbrium basin: New 40Ar-39Ar ages of Apollo 14 rocks
Petrographically and chemically well-characterized rocks of the Apollo 14 landing site (12 impact melt breccias, 3 clast-free impact melt rocks, 2 granulitic rocks, 1 cataclastic noritic anorthosite, 1 shocked gabbronorite, 1 mare basalt, and 1 plagioclase single crystal) have been dated by the 40Ar-39Ar technique. The samples represent two different formations at the Apollo 14 site: (1) small ...
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ژورنال
عنوان ژورنال: Meteoritics & Planetary Science
سال: 2012
ISSN: 1086-9379
DOI: 10.1111/j.1945-5100.2012.01397.x