An estimate of the heat flow on the Meteor Rise, subantarctic South Atlantic

Journal Article · Wed Apr 10 00:00:00 EDT 1991 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/91JB00002· OSTI ID:5456915

Nobes, D C ^[1]; Mienert, J ^[2]; Mwenifumbo, C J ^[3]

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1. Univ. of Waterloo, Ontario (Canada)
2. Univ. zu Kiel (West Germany)
3. Geological Survey of Canada, Ottawa, Ontario (Canada)

Heat flow determinations require more than one reliable temperature measurment to obtain an estimate of the temperature gradient, and subsequently the heat flow. Two temperature readings were taken on leg 114 of the Ocean Drilling Program, both in hole 704B on the Meteor Rise in the subantarctic South Atlantic. One of these readings appears to be reliable, but the other appears to be invalid. Because any temperature gradient and estimate of heat flow derived using these two readings will be questionable, the authors suggest a different approach to determine heat flow. They use the one reliable temperature measurement to calibrate the temperature derived from the induction resistivity log and the laboratory porosity measurements. The temperature and heat flow depend on the shape factor used in the modified Archie's law. The temperature gradient empirically obtained from the resistivity and porosity is 38 {plus minus} mK/m and the average heat flow is 64 {plus minus} 8 mW/m{sup 2}, which is consistent with the age of the Meteor Rise (approximately 60 to 65 Ma). These values are in agreement with the computed heat flow when they assume a simple linear temperature gradient through the sediment section.

• OSTI ID: 5456915
• Journal Information: Journal of Geophysical Research; (United States), Vol. 96:B4; ISSN 0148-0227
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
ATLANTIC OCEAN
GEOLOGIC FORMATIONS
HEAT FLOW
AGE ESTIMATION
BOREHOLES
CALIBRATION
DATA ACQUISITION
DRILLING
MEASURING METHODS
OCEANIC CRUST
POROSITY
RELIABILITY
RESISTIVITY LOGGING
TEMPERATURE GRADIENTS
TEMPERATURE MEASUREMENT
CAVITIES
EARTH CRUST
ELECTRIC LOGGING
SEAS
SURFACE WATERS
WELL LOGGING
580000* - Geosciences