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Open- and closed-system characteristics of a tilted plutonic system, Klamath Mountains, California

Barnes, Calvin G. and Allen, Charlotte M. and Saleeby, Jason (1986) Open- and closed-system characteristics of a tilted plutonic system, Klamath Mountains, California. Journal of Geophysical Research B, 91 (B6). pp. 6073-6090. ISSN 0148-0227. doi:10.1029/JB091iB06p06073.

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The Wooley Creek batholith and Slinkard pluton are adjacent plutons with identical U-Pb zircon ages of 161 +4/−2 Ma. The plutons dip toward each other, which suggests that they are connected in the subsurface. Geologic and thermochemical evidence shows that the Slinkard pluton is the structurally lowest part of the system and the Wooley Creek batholith the structurally highest, with a total structural relief of at least 15 km. The wall rocks adjacent to the highest level of the Wooley Creek batholith are intruded by mafic to felsic dikes derived from the subjacent pluton. The Slinkard pluton is predominantly quartz diorite but grades from two-pyroxene diorite to sparse muscovite-biotite granite and shows little evidence of contamination except near contacts. The Wooley Creek batholith grades upward from two-pyroxene gabbro to biotite-hornblende granite and has a central zone in which injected mafic magma was trapped and mixed. Major and trace element data are consistent with closed-system fractionation of the Slinkard pluton and lower (adjacent) Wooley Creek batholith, but with open-system differentiation of the upper Wooley Creek batholith and roof-zone dikes. Andesitic roof-zone dikes show trace element enrichment similar to the central mixed zone of the Wooley Creek batholith and may have differentiated at that central level of the system.

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Additional Information:© 1986 by the American Geophysical Union. Received November 12, 1984; revised October 1, 1985; accepted October 7, 1985. Paper number 4B5342. We are grateful to M. A. Kays, R. G. Coleman, and M. M. Donato for their encouragement and assistance. Reviews by A. Halliday and an anonymous reviewer are greatly appreciated. Our work was supported by NSF grant EAR 8408319 and Texas Tech University (to C. G. B.), Sigma Xi (to C. M. A.), and NSF grants EAR 7925998 and EAR 8206382 (to J. B. S.). Patience and expertise in hand purification of zircon fractions by Cherilyn Saleeby were essential for this study.
Funding AgencyGrant Number
NSFEAR 8408319
Texas Tech UniversityUNSPECIFIED
NSFEAR 7925998
NSFEAR 8206382
Issue or Number:B6
Record Number:CaltechAUTHORS:20140826-111010397
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Official Citation:Barnes, C. G., C. M. Allen, and J. B. Saleeby (1986), Open- and closed-system characteristics of a tilted plutonic system, Klamath Mountains, California, J. Geophys. Res., 91(B6), 6073–6090, doi:10.1029/JB091iB06p06073
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48910
Deposited By: Tony Diaz
Deposited On:26 Aug 2014 19:48
Last Modified:10 Nov 2021 18:37

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