Scientific Drilling at Sulphur Springs, Valles Caldera, New Mexico- Core Hole VC-2A

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Journal Article: Scientific Drilling at Sulphur Springs, Valles Caldera, New Mexico- Core Hole VC-2A

Abstract
A scientific core hole has been drilled into the western ring fracture zone of the Valles Caldera, N.Mex. Hole VC-2A, the second scientific core hole in the caldera, was cored through a faulted and brecciated sequence of intracaldera tuffs and volcaniclastic rocks to a depth of 528 m at Sulphur Springs. As of November 1, 1986, the unequilibrated bottom hole temperature was 212°C. The rocks that have been penetrated are intensely altered and contain molybdenite mineralization (MnC>2) that is less than or equal to 1.1 m.y. in age. The active hydrothermal system at Sulphur Springs consists of a thin (5-m) acid condensation zone overlying vapor- and water-dominated zones. The latter two zones are apparently separated by a region of tightly sealed rock.

Authors 
Fraser E. Goff, Dennis L. Nielson, Jamie N. Gardner, Jeffrey B. Hulen, Peter Lysne, Lisa Shevenell and John C. Rowley








Published Journal 
EOS, Transactions American Geophysical Union, 1987





DOI 
10.1029/EO068i030p00649-01

Online 
Internet link for Scientific Drilling at Sulphur Springs, Valles Caldera, New Mexico- Core Hole VC-2A

Citation

Fraser E. Goff,Dennis L. Nielson,Jamie N. Gardner,Jeffrey B. Hulen,Peter Lysne,Lisa Shevenell,John C. Rowley. 1987. Scientific Drilling at Sulphur Springs, Valles Caldera, New Mexico- Core Hole VC-2A. EOS, Transactions American Geophysical Union. 68(30):649-662.