Thermal regime of the southern Basin and Range Province: 1. Heat flow data from Arizona and the Mojave Desert of California and Nevada

1994 ◽  
Vol 99 (B11) ◽  
pp. 22093-22119 ◽  
Author(s):  
J. H. Sass ◽  
Arthur H. Lachenbruch ◽  
S. P. Galanis ◽  
Paul Morgan ◽  
S. S. Priest ◽  
...  
Keyword(s):  
Heat Flow ◽  
Thermal Regime ◽  
Mojave Desert ◽  
Basin And Range ◽  
Flow Data ◽  
Basin And Range Province ◽  
Southern Basin

scholarly journals Heat Flow Data in an Area of the Eastern Southern Basin and Range in Arizona Contribute to an Analysis of Neogene Lithosphere Thinning Greater than 100 Km

Lithosphere ◽  
2020 ◽  
Vol 2020 (1) ◽  
pp. 1-9
Author(s):  
Marshall Reiter
Keyword(s):  
Heat Flow ◽  
Colorado Plateau ◽  
Basin And Range ◽  
Mantle Lithosphere ◽  
Flow Data ◽  
Southern Basin ◽  
Vertical Advection ◽  
Lithosphere Thinning ◽  
Tectonic Development ◽  
Paleotemperature Gradient

Abstract Heat flow data and thermochronologic derived paleotemperature gradient data are examined to calculate heat flow ~25 Ma and, at present, for a southern Basin and Range location north of Tucson, Arizona. An increase in the surface heat flow is estimated from ~25 Ma to the present; changing from ~47 to ~83 mW m-2. Steady-state conduction temperature vs. depth profiles provide estimates of lithosphere thicknesses both for the present and for ~25 Ma. Different heat transfer models for present heat flow predict present LAB depth that agrees with seismic studies. From these temperature profiles, lithosphere thinning from ~184 km to ~70 km is suggested during the Neogene. Mantle lithosphere thinning caused by thermal phenomena is likely a fundamental driving force for southern Basin and Range extension. Because the mantle lithosphere has likely thinned much more than the crust, it is shown that additional vertical advection, such as an asthenosphere plume, delaminating part of the mantle lithosphere, convection cells, and rising magmas along conduits, add to the vertical advection component of upper mantle lithosphere extension. Interestingly, values of heat flow 25 Ma, lithosphere thicknesses 25 Ma, and Neogene lithosphere thinning are somewhat similar for the Four Corners area of the Colorado Plateau and the southern Basin and Range, even though Neogene tectonic development was quite different, i.e., no Neogene extension in the Colorado Plateau vs. ~57% in the southern Basin and Range. Neogene lithosphere thinning phenomena are likely different in the two regions.

scholarly journals Thermal regime of the lithosphere from heat flow data

Lithosphere ◽  
2011 ◽  
pp. 220-316
Author(s):  
Irina Artemieva
Keyword(s):  
Heat Flow ◽  
Thermal Regime ◽  
Flow Data

scholarly journals Porphyry Copper Potential of the United States Southern Basin and Range Using ASTER Data Integrated with Geochemical and Geologic Datasets to Assess Potential Near-Surface Deposits in Well-Explored Permissive Tracts

2019 ◽  
Vol 114 (6) ◽  
pp. 1095-1121
Author(s):  
John C. Mars ◽  
Gilpin R. Robinson ◽  
Jane M. Hammarstrom ◽  
Lukas Zürcher ◽  
Helen Whitney ◽  
...  
Keyword(s):  
United States ◽  
Expert Opinion ◽  
Porphyry Copper ◽  
Basin And Range ◽  
Porphyry Copper Deposits ◽  
Basin And Range Province ◽  
Copper Deposits ◽  
Southern Basin ◽  
Aster Data ◽  
Undiscovered Deposits

Abstract ArcGIS was used to spatially assess and rank potential porphyry copper deposits using Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data together with geochemical and geologic datasets in order to estimate undiscovered deposits in the southern Basin and Range Province in the southwestern United States. The assessment was done using a traditional expert opinion three-part method and a prospectivity model developed using weights of evidence and logistic regression techniques to determine if ASTER data integrated with other geologic datasets can be used to find additional areas of prospectivity in well-explored permissive tracts. ASTER hydrothermal alteration data were expressed as 457 alteration polygons defined from a low-pass filtered alteration density map of combined argillic, phyllic, and propylitic rock units. Sediment stream samples were plotted as map grid data and used as spatial information in ASTER polygons. Gravity and magnetic data were also used to define basins greater than 1 km in depth. Each ASTER alteration polygon was ranked for porphyry copper potential using alteration types, spatial amounts of alteration, stream sediment geochemistry, lithology, polygon shape, proximity to other alteration polygons, and deposit and prospects data. Permissive tracts defined for the assessment in the southern Basin and Range Province include the Laramide Northwest, Laramide Southeast, Jurassic, and Tertiary tracts. Expert opinion estimates using the three-part assessment method resulted in a mean estimate of 17 undiscovered porphyry copper deposits, whereas the prospectivity modeling predicted a mean estimate of nine undiscovered deposits. In the well-explored Laramide Southeast tract, which contains the most deposits and has been explored for over 100 years, an average of 4.3 undiscovered deposits was estimated using ASTER alteration polygon data versus 2.8 undiscovered deposits without ASTER data. The Tertiary tract, which contains the largest number of ASTER alteration polygons not associated with known Tertiary deposits, was predicted to contain the most undiscovered resources in the southern Basin and Range Province.

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