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Geochemistry of sinters of the alkaline chloride hot springs of the Rotorua Geothermal Field

Citation

Van Moort, JC and O'Shea, A, Geochemistry of sinters of the alkaline chloride hot springs of the Rotorua Geothermal Field, Proceedings of the 26th International Applied Geochemistry Symposium Incorporating the 35th New Zealand Geothermal Workshop, 18-21 November 2013, Rotorua, New Zealand (2013) [Refereed Conference Paper]

Abstract

Sinters around the active geothermal springs at Rotorua consist of amorphous opal-A (except those around the Ngararatutara spring, which have in addition various amounts of chalcedony). Fossil sinters consist of opal-CT. Trace element analyses of the sinters show enrichment of As, Ga, Tl, Ge, Hg, Sb, W, Mo, Ag and occasionally Au. The fossil sinters have in comparison a much lower water content and are in comparison depleted of Al, Fe, Mg, Ca, Na, K and P and the traces of As, Ga, Tl, Ag, Sb, Mo and Pb, all due to leaching of sulphates or destruction of sulphides. Ge, Hg and W are not depleted. The presence of up to 17 ppm Ge in the SiO4 lattice is indicative of rapid drop in temperature and pressure of the geothermal fluids.

Item Details

Item Type:Refereed Conference Paper
Research Division:Earth Sciences
Research Group:Geochemistry
Research Field:Exploration geochemistry
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Van Moort, JC (Dr Jan Van Moort)
ID Code:103690
Year Published:2013
Deposited By:Earth Sciences
Deposited On:2015-10-26
Last Modified:2015-10-26
Downloads:0

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