Far-travelled Permian chert of the North Fork terrane, Klamath Mountains, California
Article Abstract:
The Permian chert of the North Fork terrane, Klamath Mountains, California, has been displaced by 8.6 degrees plus or minus 2.5 degrees in the northern direction from its place of deposition. The rocks of the chert were displaced as a solid block that is latitudinally concordant with the North American craton. Paleomagnetic evidence suggests that the paleolatitude of the chert is 8.6 degrees plus or minus 2.5 degrees. Convergence of the North Fork with the composite Central Metamorphic-Eastern Klamath terranes took place during Triassic or Early Jurassic period, and joined during the Middle Jurassic period.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1996
User Contributions:
Comment about this article or add new information about this topic:
Pre-Neogene evolution of the Western Carpathians: constraints from the Bochnia-Tatra Mountains section (Polish Western Carpathians)
Article Abstract:
A study of the balanced cross section of major structure and evolution of the Polish Western Carpathians shows that the Outer Carpathians are comprised of many flysch thrust units, the internal structure of which is strongly controlled by the initial thickness of the flysch succession. The Inner Carpathians' structure shows that it is an antiformal stack of basement thrust sheets. This means that the post-Middle Oligocene shortening in the European foreland platform and Outer Carpathian is more than 180 km. This shortening is probably solved by basement consumption.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1995
User Contributions:
Comment about this article or add new information about this topic:
Wide-angle seismic constraints on the evolution of the deep San Andreas plate boundary by Mendocino triple junction migration
Article Abstract:
Data from a number of seismic surveys in the California Coastal Ranges have shown the existence of a mafic layer in the lower crust throughout the entire ranges. The existence and geometry of this layer place significant constraints on the tectonic models for evolution of the deep plate boundary under the influence of triple junction migration. It is possible that different tectonic models are correct in different regions. Both the Pacific slab model and the asthenospheric upwelling model are inconsistent with the seismic data.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1998
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Silurian plutonism in the Trinity terrane (Neoproterozoic and Ordovician), Klamath Mountains, California, United States
- Abstracts: Early Jurassic hydrothermal vent community from the Franciscan complex, San Rafael Mountains, California. Long-term faunal stasis with evolutionary coordination: Jurassic benthic marine paleocommunities, Western Interior, United States: comment and reply
- Abstracts: Back folds in the core of the Himalayan orogen: an alternative interpretation. Occurrence, age, and implications of the Yagan-Onch Hayrhan metamorphic core complex, southern Mongolia
- Abstracts: Displacement since the Pliocene along the southern section of the Alpine fault, New Zealand: comment and reply
- Abstracts: Shock-induced amorphous textures in plagioclase, Maniacouagan, Quebec, Canada. Fluid-rock interaction between syenites and marbles at Stephen Cross Quarry,Quebec, Quebec, Canada: petrological and stable isotope data