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Impinging ring dike complexes in the Sierra Nevada batholith, California: Roots of the Early Cretaceous volcanic arc

Clemens-Knott, Diane and Saleeby, Jason B. (1999) Impinging ring dike complexes in the Sierra Nevada batholith, California: Roots of the Early Cretaceous volcanic arc. Geological Society of America Bulletin, 111 (4). pp. 484-496. ISSN 0016-7606. doi:10.1130/0016-7606(1999)111<0484:IRDCIT>2.3.CO;2.

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In this paper we interpret new and previously published U-Pb zircon data in light of structures mapped within ∼360 km^2 of the southwestern Sierra Nevada batholith. Traces of intrusive contacts and igneous foliations reveal the presence of two ring dike complexes: the eastern ring complex and the western ring(?) complex. These subvolcanic complexes formed during overlapping periods: the eastern ring complex between 123 and 117 Ma (n = 5) and the western ring complex between 120 and 115 Ma (n = 5). Each complex may have been emplaced during a minimum of two events, each 2 to 3 m.y. long and separated by 3 to 4 m.y. In the western ring complex, the presence of a 120 Ma xenolith of silicified porphyry enclosed by unaltered tonalite implies that the ring complexes intruded the shallow crust and stoped the overlying volcanic-hypabyssal constructs. Rare mafic mylonites suggest that collapse of a mafic-ultramafic mass may have assisted western ring complex emplacement. Near-synchronous emplacement of the two ring complexes is consistent with textures and structures indicative of intense magma mingling and synmagmatic deformation preserved in the north-northeast–trending Stone Corral shear zone. The ≥ 13-km-long Stone Corral shear zone separates the impinging magmatic centers and was active ca. 116 ± 2 Ma. Blocks of layered plagioclase-olivine-orthopyroxene cumulates, 0.2–5.5 km long, also record variable synmagmatic deformation ca. 123 ± 3 Ma, thus indicating that the cumulates crystallized in a shallow, dynamic environment immediately preceding or during the earliest stages of ring dike emplacement.

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Additional Information:© 1999 Geological Society of America. Manuscript received by the Society July 16, 1996; Revised manuscript received March 23, 1998; Manuscript accepted April 28, 1998. This work was supported by a National Science Foundation Graduate Fellowship, two GSA Penrose grants and a California State University, Fullerton Faculty Grant to Clemens-Knott, and National Science Foundation grant EAR-9105692 to Saleeby. We thank the many ranchers and farmers of the Stokes Mountain region allowing access to their properties, and the Chrisman, Collins, Edminston, and Travoli families for their generous hospitality. M. Chaudhry prepared zircon separates. J. Knott assisted with drafting. The late Martin Stout provided air photos from the California State University, Los Angeles collection. We benefited from discussions with L. T. Silver and M. B. Wolf; this manuscript was greatly improved based on thorough reviews by C. R. Bacon and T.W. Sisson. Caltech Division of Geological and Planetary Science Contribution 5746.
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NSF Graduate FellowshipUNSPECIFIED
Geological Society of America Penrose Bequest Research GrantsUNSPECIFIED
California State University, FullertonUNSPECIFIED
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Caltech Division of Geological and Planetary Sciences 5746
Issue or Number:4
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Official Citation:Diane Clemens-Knott and Jason B. Saleeby Impinging ring dike complexes in the Sierra Nevada batholith, California: Roots of the Early Cretaceous volcanic arc Geological Society of America Bulletin, April, 1999, v. 111, p. 484-496, doi:10.1130/0016-7606(1999)111<0484:IRDCIT>2.3.CO;2
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48868
Deposited By: Tony Diaz
Deposited On:25 Aug 2014 23:14
Last Modified:10 Nov 2021 18:37

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