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Title: History and results of VC-1, the first CSDP corehole in Valles caldera, New Mexico

Abstract

Valles Caldera No. 1 (VC-1) is the first Continental Scientific Drilling Program (CSDP) corehole drilled in the Valles caldera and the first continuously cored hole in the caldera region. The objectives of VC-1 were to penetrate a hydrothermal outflow plume near its source, to obtain structural and stratigraphic information near the intersection of the ring-fracture zone and the pre-caldera Jemez fault zone, and to core the youngest volcanic unit inside the caldera (Banco Bonito obsidian, 0.13 Ma). VC-1 penetrates 298 m of moat volcanics and caldera-fill ignimbrites, 35 m of pre-caldera volcaniclastic breccia, and 523 m of Paleozoic carbonates, sandstones and shales, with over 95% core recovery. Hydrothermal alterations are concentrated in sheared, brecciated and fractured zones from the volcaniclastic breccia to total depth with both the intensity and rank of alterations increasing with depth. Alterations consist primarily of clays, calcite, pyrite, quartz, and chlorite, but chalcopyrite has been identified as high as 518 m and molybdenite has been identified in a fractured zone at 847 m. Thermal aquifers were penetrated at various intervals from about 510 m on down. 11 refs., 5 figs.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (USA); Tonto Drilling Services, Inc., Salt Lake City, UT (USA); NL Baroid, Inc., Sandia Park, NM (USA)
OSTI Identifier:
5573384
Report Number(s):
LA-UR-85-1005; CONF-850801-31
ON: DE85009640
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: International symposium on geothermal energy, Kailua Kona, HI, USA, 26 Aug 1985; Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; BACA GEOTHERMAL FIELD; STRATIGRAPHY; CALDERAS; WELL DRILLING; DRILL CORES; PETROLOGY; AQUIFERS; BOREHOLES; HYDROTHERMAL ALTERATION; NEW MEXICO; CAVITIES; DRILLING; FEDERAL REGION VI; GEOLOGY; GEOTHERMAL FIELDS; NORTH AMERICA; USA; Geothermal Legacy; 150201* - Geology & Hydrology of Geothermal Systems- USA- (-1989)

Citation Formats

Goff, F, Rowley, J, Gardner, J N, Hawkins, W, Goff, S, Pisto, L, and Polk, G. History and results of VC-1, the first CSDP corehole in Valles caldera, New Mexico. United States: N. p., 1985. Web.
Goff, F, Rowley, J, Gardner, J N, Hawkins, W, Goff, S, Pisto, L, & Polk, G. History and results of VC-1, the first CSDP corehole in Valles caldera, New Mexico. United States.
Goff, F, Rowley, J, Gardner, J N, Hawkins, W, Goff, S, Pisto, L, and Polk, G. Tue . "History and results of VC-1, the first CSDP corehole in Valles caldera, New Mexico". United States. https://www.osti.gov/servlets/purl/5573384.
@article{osti_5573384,
title = {History and results of VC-1, the first CSDP corehole in Valles caldera, New Mexico},
author = {Goff, F and Rowley, J and Gardner, J N and Hawkins, W and Goff, S and Pisto, L and Polk, G},
abstractNote = {Valles Caldera No. 1 (VC-1) is the first Continental Scientific Drilling Program (CSDP) corehole drilled in the Valles caldera and the first continuously cored hole in the caldera region. The objectives of VC-1 were to penetrate a hydrothermal outflow plume near its source, to obtain structural and stratigraphic information near the intersection of the ring-fracture zone and the pre-caldera Jemez fault zone, and to core the youngest volcanic unit inside the caldera (Banco Bonito obsidian, 0.13 Ma). VC-1 penetrates 298 m of moat volcanics and caldera-fill ignimbrites, 35 m of pre-caldera volcaniclastic breccia, and 523 m of Paleozoic carbonates, sandstones and shales, with over 95% core recovery. Hydrothermal alterations are concentrated in sheared, brecciated and fractured zones from the volcaniclastic breccia to total depth with both the intensity and rank of alterations increasing with depth. Alterations consist primarily of clays, calcite, pyrite, quartz, and chlorite, but chalcopyrite has been identified as high as 518 m and molybdenite has been identified in a fractured zone at 847 m. Thermal aquifers were penetrated at various intervals from about 510 m on down. 11 refs., 5 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {1}
}

Conference:
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