Sea level changes versus hydrothermal diagenesis: Origin of Triassic carbonate platform cycles in the Dolomites, Italy: Discussion

Peterhansel, A. and Egenhoff, S. O. (2005) Sea level changes versus hydrothermal diagenesis: Origin of Triassic carbonate platform cycles in the Dolomites, Italy: Discussion. Sedimentary Geology, 178 (1-2). pp. 145-149. DOI 10.1016/j.sedgeo.2005.03.004

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Abstract

In his recent paper, Blendinger (2004) presents a new and unconventional hypothesis for the formation of the Triassic Latemàr carbonate cycles. He assigned the cycles to intermittent hydrothermal influence alternating with normal marine deposition. Fluids with a composition similar to normal seawater were forced by elevated heat flow from an underlying hydrothermal field to circulate to the seafloor. These fluids are said to produce stratiform diagenetic features including tepees, and they favoured early dolomitization and the growth of cyanobacterial mats. This interpretation deviates strongly from the conventional models where these cycles are considered to be the result of relative sea-level fluctuations in a shallow-marine to subaerially exposed environment (Hardie et al., 1986, Goldhammer et al., 1987, Goldhammer et al., 1990 R.K. Goldhammer, P.A. Dunn and L.A. Hardie, Depositional cycles, composite sea-level changes, cycle stacking patterns, and the hierarchy of stratigraphic forcing: examples from Alpine Triassic platform carbonates, Geol. Soc. Amer. Bull. 102 (1990), pp. 535–562.Goldhammer et al., 1990, Goldhammer et al., 1993, Brack et al., 1996, Mundil et al., 1996, Egenhoff et al., 1999, Preto et al., 2001, Mundil et al., 2003 and Zühlke et al., 2003). We welcome this entirely new approach, as it further stimulates a discussion on the validity of criteria used to detect subaerial exposure from carbonate facies. Furthermore, it highlights the importance of microbial growth and cementation processes for the development and the geometrical maintenance of post-extinction carbonate platforms such as the Latemàr.

Item Type: Article
Uncontrolled Keywords: 2005 AREP IA47 IA48 2005 P
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: Sedimentary Geology
Volume: 178
Page Range: pp. 145-149
Identification Number: 10.1016/j.sedgeo.2005.03.004
Depositing User: Sarah Humbert
Date Deposited: 11 Nov 2010 12:14
Last Modified: 23 Jul 2013 09:59
URI: http://eprints.esc.cam.ac.uk/id/eprint/1772

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