experiment shows the effects of an active basement thrust slice ... basement thrust slice in this area. ..... The frontal thrust flattens progressively from stage 6b to.
Dwight Bradley. Richard Goldfarb. U.S. Geological Survey, Box 25046, MS 973, Denver Federal Center, Denver, Colorado, 80225. Lawrence Snee. Cliff Taylor.
Munazzam Ali Mahar1*, Terry L Pavlis1, John R Bowman2, Walter K Conrad3, Philip C. 5. Goodell1. 6. 1 Department of Geological Sciences, University of Texas ...
Joseph L. Goldstein. Mary L. Good. F. Clark Howell. James D. Idol, Jr. Leon Knopoff. Oliver E. Nelson. Yasutomi Nishizuka. Helen M. Ranney. David M. Raup.
In an accretionary complex, pelagic sediment commonly overlies layers of midocean ridge ba- salt, but in some complexes, oceanic pelagic beds are absent ...
In the Madre de Dios basin, seismic reflection profiles show an onlap of late. Neogene ... Iquitos region (Hoorn, 1993; Râsânen et al., 1995; Gingras et al., 2002).
plutons. In addition, minor dike-like intrusion of a gra- nitic rock is distributed ...... rhyolite (Crecraft et al., 1981; Norman et al., 1992; Gerber et al., 1995; Miller and ...
wedge system: Insights from marine observations and sandbox experiments. S. Dominguez1, S. Lallemand1, J. Malavieille1 & P. Schnürle2. 1Laboratoire de ...
We use a modified version of the finite element code Cit-. comS (Tan et al., 2006), where we incorporated a pseudo free surface in modeling subduction (Liu and ...
magmas by melting of subducting sediments in Shodo-. Shima island, Southwest Japan, and its bearing on the ori- gin of high-Mg andesites. Isl. Arc 8, 383â392.
HREE-depleted magma similar to the Archean TTG, call- ing attention to the .... location where an active spreading center is colliding with and subducting ...
Estero Cono. Pan de. Azucar. TRES MONTES. PENINSULA. Cabo Raper. Fjordo San Pedro. Cupula. San Pablo. 75Ë35'W. 75Ë30'W. 75Ë25'W. 75Ë20'W. 75Ë15'W.
University of Sydney, Department of Geosciences Email: [email protected] ... previously been attributed to Kula-Pacific ridge subduction at 85 Ma ...
trench (Clift and Hartley, 2007). Furthermore, the fact that similar Pleisto- cene uplift is seen along much of the northern Andean margin suggests that much of ...
Apr 10, 2000 - shown along the Taitao peninsula transect, including (1) rapid uplift ...... the Humboldt abyssal plain, the Mornington channel, deep- sea fan ...
movement of the Riviera and Cocos plates [Stock and Lee,. 1994; Bandy et al., 19951. Subduction of the Mendocino fracture zone has significantly altered the ...
The interaction of the Pacific-Farallon spreading centers with the North American con- vergent margin off Baja California, Mexico, supposedly ceased at 12 Ma, ...
1 CAS Key Laboratory of Isotope Geochronology and Geochemistry, Guangzhou ... Ridge subduction and porphyry copper-gold mineralization: An overview.
world (Åengör et al., 1993; Windley et al., 2007; Xiao et al., 2010, 2013;. Safonova .... from the Late Silurian to the Permian (Han et al., 2006; Chen et al.,. 2010a ...
United States where a substantial locked interplate zone ...... et al., 2000]. v = orthogonal plate convergence based on global plate kinematic models [DeMets et ...
Dec 10, 2005 - Department of Geology, San Jose State University, One Washington Square, San Jose, ..... survey in 1995 aboard R/V Maurice Ewing of.
mid-ocean ridges and the overlying ocean through submarine hydrothermal circu- lation remains a ... mum temperatures that can exceed 400°C . At these temper- atures the fluids .... Atlantic Ridge have revealed a new class of tectonically-.
considerably over the cross section as can be seen in Fig. 1. This figure shows the cross section of an AlGaInP-. GaInP ridge laser mounted junction-side-down ...
of depth (Figure 2a) show that upward deflections of the α â β, α â γ, and β â γ .... slab and new global tectonics, J. Geophys. Res., 75, 1379-1419,. 1970.
Earth and Planetary Science Letters, 44 (1979) 239-246. 239 ... Lamont-Doherty Geological Observatory of Columbia University, Palisades, NY 10964 (U.S.A.).
Earth and Planetary Science Letters, 44 (1979) 239-246
THERMAL EFFECTS OF RIDGE SUBDUCTION S T E P H E N E. D e L O N G
Department o f Geological Sciences, State University o f New York at Albany, Albany, NY 12222 (U.S.A.) W.M. S C H W A R Z
Department o f Physics, Union College, Schenectady, NY 12308 (U.S.A.) and R O G E R N. A N D E R S O N
Lamont-Doherty Geological Observatory o f Columbia University, Palisades, NY 10964 (U.S.A.)
Received January 29, 1979 Revised version received April 2, 1979
The temperature structure of a subduction zone during subduction of an oceanic spreading ridge has been calculated by a finite-difference procedure. The plates preceding and following the ridge crest into the trench had convergence rates of 90 and 20 mm/yr, respectively, corresponding to a spreading half-rate for the ridge of 35 mm/yr and to the velocity balance for a simple three-plate model of ridge subduction. Abrupt temperature increases in the range 50-500°C occur at shallow locations (~
