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Geochemical Logging in the Cajon Pass Drill Hole and Its Application to a New, Oxide, Igneous Rock Classification Scheme

Pratson, Elizabeth Lewis and Anderson, Roger N. and Dove, Roy E. and Lyle, Mitchell and Silver, Leon T. and James, Eric W. and Chappell, Bruce W. (1992) Geochemical Logging in the Cajon Pass Drill Hole and Its Application to a New, Oxide, Igneous Rock Classification Scheme. Journal of Geophysical Research B, 97 (B4). pp. 5167-5180. ISSN 0148-0227. doi:10.1029/91JB02643.

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A new elemental oxide classification scheme for crystalline rocks is developed and applied to geochemical well logs from the Cajon Pass drill hole. This classification scheme takes advantage of measurements of elements taken by a geochemical logging tool string. It uses K_2O versus SiO_2/Al_2O_3 to distinguish between granites, granodiorites, tonalites, syenites, monzonites, diorites, and gabbros. Oxide measurements from cores are used to calibrate the elemental abundances determined from the well logs. From these logs, a detailed lithologic column of the core is generated. The lithologic column derived from the well log classification scheme is compared with a lithologic column constructed from core samples and well cuttings. In the upper 1295 m of the well, agreement between the two columns is good. Discrepancies occur from 1295 to 2073 m and are believed to be caused by the occurrence of rock types not distinguished by the classification scheme and/or the occurrence of secondary minerals. Despite these discrepancies, the well log-based classification scheme helps to distinguish changes in rock type and shows potential as an aid to the construction of lithologic columns in boreholes of crystalline rocks.

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Additional Information:© 1992 American Geophysical Union. Received May 20, 1991; revised October 3, 1991; accepted October 17, 1991. The first author would like to thank L. Pratson, J. Tivy, W. R. Van Schmus, and F. E. Goff for their input on the manuscript and critical review. M. Herron provided useful input on the ideas of the IgClass system. S. Cotkin contributed to the petrographic cutting and thin-section observation and the petrological classification of the geologic column. Lamont-Doherty Geological Observatory contribution number 4878.
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Lamont-Doherty Geological Observatory4878
Issue or Number:B4
Record Number:CaltechAUTHORS:20140312-075614994
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Official Citation:Pratson, E. L., R. N. Anderson, R. E. Dove, M. Lyle, L. T. Silver, E. W. James, and B. W. Chappell (1992), Geochemical logging in the Cajon Pass Drill Hole and its application to a new, oxide, igneous rock classification scheme, J. Geophys. Res., 97(B4), 5167–5180, doi:10.1029/91JB02643
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44270
Deposited By: Ruth Sustaita
Deposited On:12 Mar 2014 15:55
Last Modified:10 Nov 2021 16:50

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