Comment on "Formation and Thrusting in Some Great Valley Rocks Near the Fransiscan Complex, California, and Implications for the Tectonic Wedging Hypothesis." (response to article by R.A. Glen, Tectonics, vol. 9, p. 1451, 1990)
Article Abstract:
R.A. Glen's 1990 article made a valuable contribution to data on Mesozoic and Cenozoic forearc basin evolution in northern California by mapping the western Sacramento Valley. However, extrapolation of results from his study area do not yield defensible regional paleotectonic interpretations. Structural complexity of the Paskenta area precludes the extension of the area's deformation style to the rest of the Great Valley Group (GVG). His thrust-wedge model aside, west-vergent GVG structures may have also resulted from Fransiscan rock underthrusting beneath the forearc basin flank.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1992
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Tectonic evolution of the Japanese islands as reflected in modal compositions of Cenozoic forearc and backarc sand and sandstone
Article Abstract:
Analysis of sand and sandstone from forearc and backarc basins in the Japanese continental arc-trench system reveals tectonic evolution in the area during the Cenozoic. The arc is divided by the Izu-Bonin Ridge, resulting in two triple junctions on both sides of the ridge. Deformation in these junctions has generated volcanic-sedimentary sand which is eventually deposited into the Nankai Trough. Forearc compositions indicate uplift and volcanism in the Oligocene. Uninterrupted arc volcanism in the northeast is documented by Pliocene and Quaternary sand deposits.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1992
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Article Abstract:
Raymond Ingersoll and William Dickinson prefer the original tilting hypothesis in interpreting the relevance of the Paskenta area to the Great Valley Group (GVG). However, because no evidence exists that the area is atypically complex, its relevance to the GVG may be considered, as supported by Glen (1990). Recent forearc models, involving backstop inclination leading to forearc basin and accretionary prism deformation, exist that provid.e a viable alternative to the tilting hypothesis. Further research may lead to a convergence of these models.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1992
User Contributions:
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- Abstracts: Comment on "Origin of the Chichibu Sea, Japan: Middle Paleozoic to Early Mesozoic Plate Construction in the Northern Margin of the Gondwana Continent." (response to article by S. Otoh, S. Yamakita, and S. Yanai, Tectonics, vol. 9, p. 423, 1990)
- Abstracts: Active continental rifting in southern Baja California, Mexico: implications for plate motion partitioning and the transition to seafloor spreading in the Gulf of California
- Abstracts: The kinematic history of the Pennine Nappes east of the Lepontine Dome: implications for the tectonic evolution of the Central Alps
- Abstracts: Extension in the southern Ryukyu arc (Japan): Link with oblique subduction and back arc rifting. Response of intracontinental deformation in the central Andes to late Cenozoic reorganization of South American Plate motions