期刊
EARTH AND PLANETARY SCIENCE LETTERS
卷 308, 期 3-4, 页码 298-306出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.epsl.2011.05.053
关键词
Xenon; fluid inclusions; Archean; atmosphere; Isotope fractionation
资金
- CNRS
- Region Lorraine
- ANR (Agence Nationale pour la Recherche)
- Institut de Physique du Globe de Paris (IPGP)
- Geological Survey of Western Australia (GSWA)
- Science and Technology Facilities Council [ST/G003068/1] Funding Source: researchfish
- STFC [ST/G003068/1] Funding Source: UKRI
Ancient sedimentary rocks may have retained a record of the past atmospheric composition. We present evidence for the geological preservation of remnants of the Archean atmosphere. Hydrothermal quartz containing fluid inclusions from a core drilled in 3.5 Ga-old terrains at North Pole, (Western Australia), has a Ar-Ar plateau age of 3.0 +/- 0.2 Ga. An Archean age is confirmed independently by (130)Ba-(130)Xe dating of fluid inclusions. Xenon trapped in the present sample and in 3.5 Ga-old barite from the same locality (Pujol et al., 2009: Srinivasan, 1976) presents an isotopic composition intermediate between the atmospheric composition and that of chondritic, or solar, xenon. In contrast, the stable isotopes of neon and krypton are isotopically atmospheric. This observation suggests that the well known but unexplained enrichment of heavy Xe isotopes in the atmosphere relative to cosmochemical (chondritic or solar) end-members was progressive, and not complete >= 3 Ga ago. This Xe isotopic fractionation might have taken place during prolongated irradiation of the atmosphere by the ancient Sun. (C) 2011 Elsevier B.V. All rights reserved.
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