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Crustal Deformation At The Leading Edge Of The Oregon Coast Range Block Offshore Washington Columbia River To Hoh River
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Book Synopsis Crustal Deformation at the Leading Edge of the Oregon Coast Range Block, Offshore Washington (Columbia River to Hoh River) by : Patricia Alison McCrory
Download or read book Crustal Deformation at the Leading Edge of the Oregon Coast Range Block, Offshore Washington (Columbia River to Hoh River) written by Patricia Alison McCrory and published by . This book was released on 2002 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis U.S. Geological Survey Professional Paper by :
Download or read book U.S. Geological Survey Professional Paper written by and published by . This book was released on 1984 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis New Publications of the Geological Survey by : Geological Survey (U.S.)
Download or read book New Publications of the Geological Survey written by Geological Survey (U.S.) and published by . This book was released on 2003 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis New Publications of the U.S. Geological Survey by :
Download or read book New Publications of the U.S. Geological Survey written by and published by . This book was released on 2003 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis New Publications of the U.S. Geological Survey by : Geological Survey (U.S.)
Download or read book New Publications of the U.S. Geological Survey written by Geological Survey (U.S.) and published by . This book was released on 2002 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalog of United States Government Publications by :
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 2003 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Late Quaternary Crustal Deformation on the Central Oregon Coast as Deduced from Uplifted Wave-cut Platforms by : Robert Lord Ticknor
Download or read book Late Quaternary Crustal Deformation on the Central Oregon Coast as Deduced from Uplifted Wave-cut Platforms written by Robert Lord Ticknor and published by . This book was released on 1993 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geology of Oregon by : Elizabeth L. Orr
Download or read book Geology of Oregon written by Elizabeth L. Orr and published by . This book was released on 1999 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Summary of Knowledge of the Oregon and Washington Coastal Zone and Offshore Areas by :
Download or read book A Summary of Knowledge of the Oregon and Washington Coastal Zone and Offshore Areas written by and published by . This book was released on 1977 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Tertiary Geologic History of Western Oregon and Washington by : Parke Detweiler Snavely
Download or read book Tertiary Geologic History of Western Oregon and Washington written by Parke Detweiler Snavely and published by . This book was released on 1963 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Crustal Deformation in Western Oregon by : R. J. Weldon
Download or read book Crustal Deformation in Western Oregon written by R. J. Weldon and published by . This book was released on 1992* with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Books In Print 2004-2005 by : Ed Bowker Staff
Download or read book Books In Print 2004-2005 written by Ed Bowker Staff and published by R. R. Bowker. This book was released on 2004 with total page 3274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evolution of the Corvallis Fault and Implications for the Oregon Coast Range by : Chris Goldfinger
Download or read book Evolution of the Corvallis Fault and Implications for the Oregon Coast Range written by Chris Goldfinger and published by . This book was released on 1990 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Corvallis fault is a 50 km long northeast-trending structure, part of which defines the boundary between the central Willamette Valley and the east-central Coast Range of Oregon. Previously the fault had been mapped as either a high-angle reverse or normal fault, with the east block down. New gravity data suggest that the main structure is a low-angle thrust, with early Eocene Siletz River Volcanics thrust southeastward over middle to late Eocene Tyee and Spencer sandstones. The thrust geometry is similar to that of the Laramide thrusts of the Rocky Mountain foreland. Gravity modeling produces a best-fit geometry with the thrust-plane dipping approximately 100 northwest. The surface geology is consistent with a fault-propagation fold geometry. Consistent dips averaging 20° in the hanging wall block suggest a ramp dipping at the same angle, somewhat steeper than the dip indicated by gravity modeling. Vertical separation is about 6.7 km, and if the ramp dip is the same as bedding dips in the Siletz River Volcanics, horizontal displacement is 13-15 km, assuming no other thrust faults repeat the Siletz River stratigraphy. The Corvallis thrust was active during the late Eocene, and was the eastern boundary of a tectonic highland in the Eocene forearc. The highland was a local source of material for the upper Yamhill and lower Spencer Formations, deposited in a partially restricted shallow shelf to neritic setting. Other late Eocene tectonic and volcanic highlands formed an archipelago in the position of the present Coast Range. In the middle Oligocene, the fault was intruded by gabbroic dikes during an intrusive episode that emplaced massive sheets of gabbro throughout the central Coast Range. A younger normal fault paralleling the original Corvallis thrust is interpreted to be the result of gravitational collapse of the tip of the thrust sheet, and has truncated the older structure. Numerous left offsets of the main fault trace along northwest-trending left-lateral faults are interpreted to be the result of clockwise rotations of western Oregon documented by paleomagnetics. Later reactivation of the Corvallis fault as a left-lateral strike-slip fault, indicated by horizontal slickenlines, is consistent with the present north-south compression in Oregon. The Corvallis fault may have continued minor intermittent activity into the late Quaternary.
Book Synopsis Bulletin - State of Oregon Department of Geology and Mineral Industries by : Oregon. Department of Geology and Mineral Industries
Download or read book Bulletin - State of Oregon Department of Geology and Mineral Industries written by Oregon. Department of Geology and Mineral Industries and published by . This book was released on 1937 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Onshore-offshore Geologic Cross Section, Northern Oregon Coast Range to Continental Slope by : Alan R. Niem
Download or read book Onshore-offshore Geologic Cross Section, Northern Oregon Coast Range to Continental Slope written by Alan R. Niem and published by . This book was released on 1992 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dextral Shear and North-directed Crustal Shortening Defines the Transition Between Extensional and Contractional Provinces in North-central Oregon by : Ajeet K. Johnson
Download or read book Dextral Shear and North-directed Crustal Shortening Defines the Transition Between Extensional and Contractional Provinces in North-central Oregon written by Ajeet K. Johnson and published by . This book was released on 2011 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: Distributed deformation in the backarc of Cascadia is complex. Off the west coast lies the Cascadia convergent margin. East of the plate boundary, clockwise rotation of the Oregon Coast Range block with respect to stable North America influences backarc deformation, causing extensional faults in southeast Oregon, contraction folding in southeast Washington and a transition between the two opposing styles in north-central Oregon. Folding of the Mutton Mountain and Tygh Ridge anticlines commenced post 15.5 Ma and was most active between ~8.4 and 2.6 Ma. From Mutton Mountain to Tygh Ridge anticlines, minimum estimates of north-south shortening give an average shortening rate of 0.14 mm/yr from 8.4 to 2.6 Ma. Change in strike and dextral offsets of axial traces reflects a broad shear zone transferring motion between two relatively stable blocks; the Ochoco Mountain block and the Cascade arc. The transition region is characterized where dextral shear accommodates for an west-east velocity gradient. GPS velocity vectors indicate a difference of 1.0 mm/yr from the northern Basin and Range to the north and ~0.8 mm/yr from west to east.
Book Synopsis Geology of the Green Mountain-Young's River Area, Clatsop County, Northwest Oregon by : Carolyn Pugh Peterson
Download or read book Geology of the Green Mountain-Young's River Area, Clatsop County, Northwest Oregon written by Carolyn Pugh Peterson and published by . This book was released on 1983 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: The upper Eocene to lower Oligocene Oswald West mudstone is the oldest formation (informal) in the Green Mountain-Young's River area. This 1,663 meter thick hemipelagic sequence was deposited in a low-energy lower to upper slope environment in the Coast Range forearc basin. The formation ranges from the late Narizian to the early Zemorrian in age and consists of thick-bedded bioturbated foraminiferal claystone and tuffaceous siltstone. Rare glauconitic sandstone beds also occur. In the eastern part of the study area, the upper part of the Oswald West mudstone is interbedded with the upper Refugian Klaskanine siltstone tongue. This informal unit consists of thick bioturbated sandy siltstone and silty sandstone that is a lateral deep-marine correlative of the deltaic to shallow-marine Pittsburg Bluff Formation in the northeastern Coast Range. Discontinuous underthrusting of the Juan de Fuca oceanic plate at the base of the continental slope of the North American plate caused extensive uplift and subsidence along the Oregon continental margin throughout the Cenozoic (Snavely et al., 1980). Initiation of Oregon Coast Range uplift and accompanying erosion in the early Miocene, coupled with a global low stand of sea level (Vail and Mitchum, 1979), stripped most of the Oligocene (Zemorrian) Oswald West strata and in places much of the uppermost Eocene (upper Refugian) Oswald West strata in the field area, creating an unconformity. Deformation accompanying uplift included a system of east-west-trending, oblique-slip faults. The Pillarian-to-Newportian Astoria Formation unconformably overlies the Oswald West mudstone and reflects deposition offshore from an open, storm-dominated coast during an early-to-middle Miocene transgression. Deposition of the Big Creek sandstone and Silver Point mudstone members of the Astoria Formation was controlled in part by submarine paleotopography that developed as a result of early Miocene deformation of the Oswald West strata. The up to 200 meter thick Big Creek member varies from storm-deposited laminated sandstone to bioturbated mollusk-bearing silty sandstone that accumulated during fair weather conditions on the inner to middle shelf. Overlying and perhaps in part laterally equivalent to the Big Creek member is the up to 200 meter thick, deeper marine Silver Point member which consists of two lithologies: 1) interbedded, micaceous, turbidite sandstones and laminated mudstone; and 2) laminated bathyal mudstone that intertongues with and caps the turbidite sequences. The turbidite lithology is composed of two facies: 1) an underlying sand-rich facies, transitional between the shallow-marine Big Creek member and bathyal Silver Point strata, that was deposited on the outer shelf by storm-induced turbidity currents; and 2) an overlying sand-poor facies that was deposited at bathyal depths. The turbidite facies channelized, and at some places removed the underlying Big Creek member and were deposited directly over Oswald West mudstone. The Astoria depositional sequence ranges, from inner to outer neritic to bathyal facies and reflects continued deepening and anoxic depositional conditions of the Astoria basin through the middle Miocene. Big Creek and Silver Point sandstone petrology reflects volcanic sources from an ancestral western Cascades volcanic arc and metamorphic and granitic basement rocks farther east via an ancestral Columbia River drainage system. Diagenetic effects include: (a) formation of local calcite concretionary cements; and (b) formation of pore-filling smectite from alteration of volcanic rock fragments. At least six middle Miocene Columbia River Basalt intrusive episodes affected the Green Mountain-Young's River area soon after deposition of the Astoria Formation. These basalt sills and dikes include normally polarized and reversely polarized low Mg0 high TiO2, low Mg0 low TiO2, and high Mg0 Grande Ronde basalt chemical subtypes and two porphyritic Frenchman Springs Member basalts (Ginkgo and Kelly Hollow petrologic types). These basalt intrusions are virtually indistinguishable, based on chemistry, from subaerial flows of the plateau-derived Columbia River Basalt Group subtypes at nearby Nicolai Mountain and Porter Ridge. This correlation supports the Beeson et al. (1979) hypothesis that the intrusions are not of local origin but formed by the invasion of the flows into the Miocene shoreline sediments to form "invasive" sills and dikes. Many dikes were emplaced along northeast- and northwest-trending faults, and some (i.e., Ginkgo) cut older sills (Grande Ronde). A laterally extensive Frenchman Springs sill occurs under an older widespread Grande Ronde sill. From this older over younger intrusive relationship, a mechanism of "invasion" of sediment from overlying lava flows is difficult to envision. A pulse of rapid subduction starting in the middle Miocene (Snavely et al., 1980) was accompanied by renewed uplift, intensive block faulting, and continued development of the earlier formed Coast Range uplift. Left-oblique northeast-trending faults and conjugate northwest-trending right-oblique faults offset Grande Ronde and Frenchman Springs dikes and sills. This conjugate fault pattern may reflect oblique east-west convergence between the North American and Juan de Fuca plates. The Silver Point mudstones and Oswald West mudstones have high total organic carbon contents, up to 5.5%, but are thermally immature and may act only as a source for biogenic gas in the subsurface. Suitable reservoir rocks, such as the gas-producing upper Eocene Cowlitz Formation C & W sandstone, may pinch out before reaching the Green Mountain-Young's River area and are yet to be penetrated by exploration drilling. Post-middle Miocene fault traps abound in the area, although these faults might also breach subsurface natural gas reservoirs in the Green Mountain-Young's River area.