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Clark Mountain thrust complex, Clark Mountain District (Clark District), Clark Mts (Clark Mountain Range), San Bernardino Co., California, USA

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Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude (WGS84): 35° North , 115° West (est.)
Margin of Error:~13km


The Clark Mountain thrust complex is located at the intersection of the Mesozoic magmatic arc and the east Sierran and Sevier thrust belts. New U-Pb zircon ages for granitic rocks establish the timing of deformation within the thrust complex. The Pachalka thrust, structurally the highest fault in the complex, carries plutonic rocks eastward above Cambrian rocks. Hanging-wall and footwall rocks are mylonitic near the thrust. Hanging-wall plutonic rocks, previously considered Precambrian, are dated at 146 62 Ma and thus are Late Jurassic. Folds kinematically related to thrusting in footwall metasedimentary rocks are overturned eastward and cut by the Pachalka pluton dated at 142 ± 7 Ma. This brackets thrusting and related deformation in structurally high levels of the complex to be latest Jurassic. The Ivanpah and Striped Mountain plutons in the Ivanpah Mountains have been dated at 147 ± 7 Ma and 141 ± 11 Ma, respectively. These plutons are cut by the Keaney-Mollusk Mine and Morning Star Mine thrusts, which are in turn cut by the middle to late Cretaceous Teutonia batholith. These data indicate that these thrusts are early to middle Cretaceous in age. - Geological Society of America Bulletin

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3 valid minerals.

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References

Adams, D.M. and Anderson, J.L. (1979) Occurrence of clintonite-monticellite-idocrase assemblages in contact skarns of the Clark Mountain Thrust, N.E. San Bernardino County, California; Abstracts with Program of the Geological Society of America: 11: 65.

Walker, J. Douglas, B.C. Burchfiel and Gregory A. Davis (1995), New age controls on initiation and timing of foreland belt thrusting in the Clark Mountains, southern California, Geological Society of America Bulletin: 107(6): 742-750.

 
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