Solution weathering rate and origin of karst landforms and caves in the quartzite of Auyan-tepui (Gran Sabana, Venezuela).

Citation

Material Information

Title:
Solution weathering rate and origin of karst landforms and caves in the quartzite of Auyan-tepui (Gran Sabana, Venezuela).
Series Title:
Geomorphology
Creator:
Piccini, Leonardo
Mecchia, Marco
Publisher:
Elsevier
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Quartzite ( local )
Solutional Weathering ( local )
Sio2 Dissolution ( local )
Karst Geomorphology ( local )
Speleogenesis ( local )
Auyan-Tepui ( local )
Genre:
serial ( sobekcm )

Notes

Abstract:
The paper reports the results of SiO2 analyses in the Aonda Cave system, located on the Auyán-tepui, one of the widest table-mountains of the Gran Sabana (South Venezuela), characterised by karst landforms developed in siliceous rock. Chemical analyses underline the very low concentration of SiO2 of the surface water. Percolation and cave drip waters have a SiO2 concentration of about 1 mg/l. The mean silica load of the cave stream is 184 mg/s, mainly derived from surface solution removal in the allogenic recharge area. In the Aonda Cave system, the mean SiO2 dissolved load is 40 mg/s, in part from surface solution (15%) and mainly from underground processes (85%). The low solubility of SiO2 in slightly acidic water implies the importance of the time factor in the formation of cave systems. With the present dissolution rate, about 10 Ma would be necessary to form the known karst system. This estimation can be significant only if we assume that climate has been stable in the last few tens of millions of years. Furthermore, this age can be taken as a minimum estimate, while, according to the geomorphic evolution of the area, the origin of the Aonda Cave system could be reasonably dated back to at least 20–30 Ma, that is, to the Oligocene.
Original Version:
Geomorphology, Vol. 106, no. 1-2 (2009-05-01).

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University of South Florida Library
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University of South Florida
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This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.

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