Comment: Oman Chronostratigraphy: (Comment on "Geochronologic constraints on the chronostratigraphic framework of the Neoproterozoic Huqf Supergroup, Sultanate of Oman" by Samuel A. Bowring, John P. Grotzinger, Daniel J. Condon, Jahandar Ramezani, Mark J. Newall and Philip A. Allen, American Journal of Science, v. 307, p. 1097-1145.)

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ID: 308460
2009
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Abstract
Bowring and others (2007) presented a compilation of high-precision U-Pb zircon ages (both detrital and from ash beds) of the exceptionally well preserved Late Neoproterozoic-Early Cambrian Huqf Supergroup of Oman.Given the general lack of precise geochronological data of the Late Neoproterozoic, the data of Bowring and others (2007) represent an important contribution to the understanding and time calibration of this period of Earth history, which records some highly enigmatic features such as the occurrence of low-latitude glaciations, extreme perturbations of the carbon cycle and the evolution of metazoans.The work by Bowring and others (2007) puts the Huqf Supergroup on the map as one of the geochronologically best constrained sections of its age and makes it an invaluable comparison for other Late Neoproterozoic successions around the world.Given the global significance of the Huqf Supergroup of Oman, we would like to clarify two important issues that arise from the Bowring and others (2007) article: (1) an inconsistency in the correlation presented by Bowring and others between glaciations recorded in northern and southern Oman and (2) the highly speculative inference of a long-lived unconformity at the Khufai-Shuram boundary. correlation of the mirbat group with the huqf supergroup stratigraphyThe correlation of the Huqf Supergroup outcrops of northern (Jabal Akhdar), central (Huqf area) and southern Oman (Mirbat) has been a topic of discussion.The Jabal Akhdar and Huqf area outcrops have been always confidently correlated thanks to the availability of abundant sedimentological, chemostratigraphic and geochronological data (Gorin and others, 1982; Loosveld and others, 1996; McCarron, ms, 2000; Cozzi and others, 2004a, 2004b; Le Guerroue ´and others, 2006a, 2006c; Rieu and others, 2006, 2007;Allen, 2007).Until recent times, the correlation of the Jabal Akhdar and Huqf outcrops with the ones in the south of Oman (Mirbat area), devoid of any direct age dating and chemostratigraphic profiles, has been more problematic and prone to speculation.In figure 2 of Bowring and others (2007) the Arkahawl and Marsham Formations of the Mirbat Group are correlated with the Nafun Group in the subsurface of southern Oman, which in northern Oman is directly overlying the Fiq glacial deposits.Later, however, this correlation is contradicted.On page 1109, they support the idea of Rieu and others (2006) that the Ayn Formation glacial deposits that directly underlie the Arkahawl Formation are in fact more likely to correlate with the ca.712 Ma Ghubrah glacial deposits in northern Oman, rather than with the younger
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Authors Erwan Le Guerroué, Ruben Rieu, Andrea Cozzi
Journal american journal of science
Year 2009
DOI
10.2475/01.2009.03
URL
https://ajs.scholasticahq.com/article/60875.pdf
Keywords Keywords not found

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