A systematic regional trend in helium isotopes across the northernbasin and range province, Western North America [electronic resource].

Published:: Washington, D.C. : United States. Dept. of Energy, 2006.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators:: United States. Department of Energy and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

An extensive study of helium isotopes in fluids collectedfrom surface springs, fumaroles and wells across the northern Basin andRange Province reveals a systematic trend of decreasing 3He/4He ratiosfrom west to east. The western margin of the Basin and Range ischaracterized by mantle-like ratios (6-8 Ra) associated with active orrecently active crustal magma systems (e.g., Coso, Long Valley,Steamboat, and the Cascade volcanic complex). Moving towards the east,the ratios decline systematically to a background value of ~;0.1 Ra. Theregional trend is consistent with extensive mantle melting concentratedalong the western margin and is coincident with an east-to-west increasein the magnitude of northwest strain. The increase in shear strainenhances crustal permeability resulting in high vertical fluid flow ratesthat preserve the high helium isotope ratios at the surface. Superimposedon the regional trend are "helium spikes," local anomalies in the heliumisotope composition. These "spikes" reflect either local zones of mantlemelting or locally enhanced crustal permeability. In the case of theDixie Valley hydrothermal system, it appears to be a combination ofboth.

Report Numbers:

E 1.99:lbnl--61338
lbnl--61338

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Note:

Published through SciTech Connect.
05/01/2006.
"lbnl--61338"
": EB4005010"
Annual Meeting of the Geothermal ResourcesCouncil, San Diego, California, 10-13 September2006.
Kennedy, B. Mack; van Soest, Matthijs C.
Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)

Funding Information:

DE-AC02-05CH11231
G32615

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