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  Systematic heat flow measurements across the Wagner Basin, northern Gulf of California

Neumann, F., Negrete-Aranda, R., Harris, R. N., Contreras, J., Sclater, J. G., González-Fernández, A. (2017): Systematic heat flow measurements across the Wagner Basin, northern Gulf of California. - Earth and Planetary Science Letters, 479, 340-353.
https://doi.org/10.1016/j.epsl.2017.09.037

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 Creators:
Neumann, Florian1, Author              
Negrete-Aranda, Raquel2, Author
Harris, Robert N.2, Author
Contreras, Juan2, Author
Sclater, John G.2, Author
González-Fernández, Antonio2, Author
Affiliations:
10 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146023              
2External Organizations, ou_persistent22              

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Free keywords: Gulf of California extensional province narrow rift continental rupture distributed deformation advective heat transport
 Abstract: A primary control on the geodynamics of rifting is the thermal regime. To better understand the geodynamics of rifting in the northern Gulf of California we systematically measured heat-flow across the Wagner Basin, a tectonically active basin that lies near the southern terminus of the Cerro Prieto fault. The heat flow profile is 40 km long, has a nominal measurement spacing of ∼1 km, and is collocated with a seismic reflection profile. Heat flow measurements were made with a 6.5-m violin-bow probe. Although heat flow data were collected in shallow water, where there are significant temporal variations in bottom water temperature, we use CTD data collected over many years to correct our measurements to yield accurate values of heat flow. After correction for bottom water temperature, the mean and standard deviation of heat flow across the western, central, and eastern parts of the basin are 220 ± 60, 99 ± 14, 889 ± 419 mW m−2, respectively. Corrections for sedimentation would increase measured heat flow across the central part of basin by 40 to 60%. We interpret the relatively high heat flow and large variability on the western and eastern flanks in terms of upward fluid flow at depth below the seafloor, whereas the lower and more consistent values across the central part of the basin are suggestive of conductive heat transfer. Moreover, heat flow across the central basin is consistent with gabbroic underplating at a depth of 15 km and suggests that continental rupture here has not gone to completion.

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 Dates: 2017
 Publication Status: Finally published
 Pages: -
 Publishing info: -
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 Rev. Type: -
 Identifiers: DOI: 10.1016/j.epsl.2017.09.037
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Title: Earth and Planetary Science Letters
Source Genre: Journal, SCI, Scopus
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Pages: - Volume / Issue: 479 Sequence Number: - Start / End Page: 340 - 353 Identifier: ISSN: 0012-821X
ISSN: 1385-013X
CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals99