The Conductive and Advective Heat Flow Budget Across the Gulf of California Rift System
Negrete Aranda, Raquel
Metadata:Show full item record
In May 2015, we conducted a cruise across the northern Gulf of California, an area of continental rift basin formation and rapid deposition of sediments. The cruise was undertaken aboard the R/V Alpha Helix; our goal was to study variations in superficial conductive heat flow, lateral changes in the shallow thermal onductivity structure, and advective transport of heat across the Wagner basin. We used a Fielax heat flow probe with 22 thermistors that can penetrate up to 6 m into the sediment cover. The resulting data set includes 76 new heat flow measurements collected along three profiles. The longest profile (42 km) contains 42 measurements spaced 1-2 km apart. The western part of the Wagner basin (hanging wall block) exhibit low to normal conductive heat flow whereas the eastern part of the basin (foot-wall block) heat flow is high to very high (up to 2500 mWm-2). Two other short profiles (12 km long each) focused on resolving an extremely high heat flow anomaly up to 6.5 Wm-2 located near the intersection between the Wagner bounding fault system and the Cerro Prieto fault. We hypothesize that the contrasting heat flow values observed across the Wagner basin are due to horizontal water circulation through sand layers and fault pathways of high permeability. Additionally, our results reveal strong vertical advection of heat due to dehydration reactions and compaction of fine grained sediments.
Publisher:American Geophysical Union
Citation:Neumann, F., Negrete Aranda, R., Contreras, J., Müller, C., Hutnak, M., González Fernandez, A., Harris, R., Sclater, J., 2015. The Conductive and Advective Heat Flow Budget Across the Gulf of California Rift System. Cartel presentado en: American Geophysical Union Fall Meeting, San Francisco, California, Estados Unidos.
UNESCO International Nomenclature: Geofísica-> Flujo de calor (terrestre)
 Geología-> Energía y procesos geotérmicos
INIS/ETDE Thesaurus:Ocean spreading center