Geothermometry in economic geology

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This document discusses geothermometry, which is the use of temperature measurements to study geological processes. It was written by Thomas Chinnappan, who has an M.Sc. in Applied Geology from Periyar University in Salem. The document expresses gratitude to the reader.

Science

ECONOMIC GEOLOGY
GEOTHERMOMETRY
BY:
THOMAS CHINNAPPAN . A ,
M.SC.APPLIED GEOLOGY,
PERIYAR UNIVERSITY,
SALEM.

Information about these fluids is an invaluable aid in mineral exploration. Conventional academic methods of analysing fluid inclusions are too slow and tedious to be of practical application in typical mineral exploration activities. However, the academic data from numerous studies does show that CO2 is an exceptionally important indicator when exploring for most types of gold deposit. Because the baro-acoustic decrepitation method is a rapid and reliable method to measure CO2 contents in fluids, it can be used to study a spatial array of data and it is an invaluable and practical exploration method. Measurements of temperatures of fluid inclusions does not usually help in mineral exploration as hydrothermal minerals deposit over a wide temperature range and there is no specific temperature which is indicative of mineralisation. However, if temperatures are available on a large spatial array of samples, then temperature trends may be a useful exploration method to find the hottest part of the system, which is presumably the location of the best economic mineralisation. Baro-acoustic decrepitation is the most practical method to determine temperatures of the large numbers of samples required. Salinities of fluid inclusions are of limited use in exploration and are difficult to measure. However, they can be used to recognise intrusion related hydrothermal systems.

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