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Middle Cretaceous silicic metavolcanic rocks in the Kings Canyon area, central Sierra Nevada, California

Saleeby, Jason B. and Kistler, Ronald W. and Longiaru, Samuel and Moore, James G. and Nokleberg, Warren J. (1990) Middle Cretaceous silicic metavolcanic rocks in the Kings Canyon area, central Sierra Nevada, California. In: The Nature and Origin of Cordilleran Magmatism. Memoir (Geological Society of America). No.174. Geological Society of America , Boulder, CO, pp. 251-270. ISBN 9780813711744.

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Metamorphosed silicic volcanic and hypabyssal rocks of middle Cretaceous (110 to 100 Ma) age occur in two roof pendants in the Kings Canyon area of the central Sierra Nevada. The metavolcanic remnants are similar in age to or are only slightly older than the voluminous enclosing batholithic rocks. Thus, high to surface levels of the batholith are implied for this region. This is interesting considering that deep-level (∼25 km) batholithic rocks of the same age as the metavolcanic rocks occur at the southern end of the range. Apparent structural continuity between these two regions suggests that the southern half of the range offers an oblique section through young (˜100 Ma) sialic crust. The middle Cretaceous ages of the two volcanic sequences are indicated by U/Pb zircon and Rb/Sr bulk-rock isochron data. The two isotopic systems agree very closely with one another. Some of the U/Pb systems within the Boyden Cave pendant are discordant due to the inheritance or entrainment of Proterozoic zircon. This is a common phenomenon in volcanic or plutonic rocks erupted or emplaced within the Kings sequence metamorphic framework, a belt of distinct pendants with abundant continent-derived sedimentary protoliths. In conjunction with other petrochemical parameters, lavas and magmas of this framework domain are shown to be contaminated with sedimentary admixtures. The contaminated domain of the batholith reflects the bounds of the Kings sequence framework, which along its eastern margin probably represents a major pre-batholith to early batholith tectonic break. The middle Cretaceous metavolcanic sequences were apparently built on two distinctly different early Mesozoic substrates separated by a major tectonic break. In the Boyden Cave pendant, the substrate may be represented by the shallow to deep-marine Kings sequence; to the east in the Oak Creek pendant, the substrate consists of a thick silicic ignimbrite sequence. In both areas the middle Cretaceous rocks and adjacent sequences share intense ductile deformation fabrics. Earlier views that considered these fabrics as an expression of Jurassic orogenic deformation are in error. Structural and age relations indicate that the fabrics developed between 105 and 100 Ma and during the medial phases of Cretaceous composite batholith growth.

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Additional Information:© 1990 Geological Society of America. Received 23 October 1987. Revision received 22 April 1988. Accepted 7 February 1989. Support for field and laboratory studies was provided by National Science Foundation (NSF) Grants EAR-8218460 and EAR-8419731 (to Saleeby) and the U.S. Geological Survey, Menlo Park. Funding for work in the Oak Creek pendant was provided for Longiaru by NSF Grants EAR-8318212 and EAR- 8503882 (to O. T. Tobisch). Funding for instrumental facilities (Saleeby) was provided by NSF Grant AEO-8415114 and the Weingart Foundation. Patience and expertise in hand-sorting of zircon by Cherilyn Saleeby is gratefully acknowledged. Special thanks to J. H. Chen for supplying zircon separates for replicate analysis. Caltech Division of Geological & Planetary Science Contribution Number 4611.
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Weingart FoundationUNSPECIFIED
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Caltech Division of Geological and Planetary Sciences4611
Series Name:Memoir (Geological Society of America)
Issue or Number:174
Record Number:CaltechAUTHORS:20140905-082210487
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Official Citation:Jason B. Saleeby, Ronald W. Kistler, Samuel Longiaru, James G. Moore, and Warren J. Nokleberg Chapter 14: Middle Cretaceous silicic metavolcanic rocks in the Kings Canyon area, central Sierra Nevada, California Geological Society of America Memoirs, 1990, 174, p. 251-271, doi:10.1130/MEM174-p251
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49266
Deposited By: Tony Diaz
Deposited On:05 Sep 2014 22:31
Last Modified:10 Nov 2021 18:41

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