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Pacific-Farallon Ridge

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Journal Article
Journal: Geology
Published: 01 January 2002
Geology (2002) 30 (1): 67–70.
...Roger L. Larson; Robert A. Pockalny; Richard F. Viso; Elisabetta Erba; Lewis J. Abrams; Bruce P. Luyendyk; Joann M. Stock; Robert W. Clayton Abstract The trace of the ridge-ridge-ridge triple junction that connected the Pacific, Farallon, and Phoenix plates during mid-Cretaceous time originates...
FIGURES
Published: 01 January 1984
DOI: 10.1130/MEM162-p81
... spreading ridge has been reconstructed using the ages and geometry of island and seamount chains emanating from Pacific hotspots. Then, by assuming symmetric spreading across the Pacific-Farallon ridge, the motion of the Farallon plate relative to the mantle has been calculated. This shows...
Journal Article
Journal: Geology
Published: 01 October 2008
Geology (2008) 36 (10): 767–770.
... the first detailed reconstruction of the break-up process. The opening began after chron 7 (25 Ma) at a location of focused crustal extension caused by overlapping spreading centers that had evolved in response to a slight reorientation of a Pacific-Farallon ridge segment. Beginning at chron 6B (22.7 Ma...
FIGURES
... of the Shatsky Rise. Magnetic anomalies and bathymetry are interpreted to indicate that segments of the Pacific-Farallon Ridge near the triple junction propagated northwest from chron M23 (153 Ma) to chron M22 (151 Ma) during a spreading ridge reorganization at the edge of a likely microplate. Our detailed...
Journal Article
Journal: Geology
Published: 01 January 2007
Geology (2007) 35 (1): 29–32.
..., revealing dramatic Cenozoic events. Globally, seafloor spreading rates increased by ∼20% during the early Cenozoic due to an increase in plate speeds in the Pacific basin. Since then, subduction of the fast-spreading Pacific-Farallon ridge system has led to a 12% decrease in average global spreading rate...
FIGURES | View All (4)
Journal Article
Journal: GSA Bulletin
Published: 01 July 1981
GSA Bulletin (1981) 92 (7): 437–446.
...REX H. PILGER, JR.; DAVID W. HANDSCHUMACHER Abstract Reconstructions of the Pacific and Nazca plates suggest that both the Nazca and Tuamotu Ridges originated from a melting anomaly which existed beneath the Pacific-Farallon Ridge during the time interval between anomalies 19 and 11, as would...
Journal Article
Journal: GSA Bulletin
Published: 01 November 1983
GSA Bulletin (1983) 94 (11): 1289–1307.
... oceanic plateau in the central North Pacific Ocean. Hess Rise apparently formed in the Southern Hemisphere along the western flank of the Pacific-Farallon Ridge 110 to 100 m.y. B.P. Core stratigraphies and lithologies show the response of sedimentation to subsidence and northward movement of Hess Rise...
Journal Article
Published: 31 May 2001
Canadian Journal of Earth Sciences (2001) 38 (5): 825–838.
... to the subduction of the PacificFarallon ridge and the initiation of a slab window environment, which persisted for 35 Ma. These asthenospheric melts were derived from a low degree of melting of a heterogeneous peridotite source mainly in the spinel stability field, as inferred from fractional melting inversion...
FIGURES | View All (10)
Image
Location of selected areas (gray polygons) and magnetic profiles (black) over bathymetry from Smith and Sandwell (1997). Data originating from the same spreading center have been grouped together (see Royer and Sandwell, 1989; Cande and Patriat, 2015; Wright et al., 2016): CIR—Central Indian Ridge; SEIR—South East Indian Ridge; WR—Wharton Ridge; PFR—Pacific-Farallon Ridge; PAR—Pacific Antarctic Ridge; PALR—Pacific Aluk Ridge.
Published: 01 November 2018
—Central Indian Ridge; SEIR—South East Indian Ridge; WR—Wharton Ridge; PFR—Pacific-Farallon Ridge; PAR—Pacific Antarctic Ridge; PALR—Pacific Aluk Ridge.
Image
Generalized geological map of the Queen Charlotte Islands, showing limits of Tertiary igneous rocks (Masset Formation volcanic rocks and Kano plutonic suite) and sampling sites (Naden Harbour, Lawn Hill, and Ramsay Island). One inset shows the location of Queen Charlotte Islands. The other inset is a cartoon map view of the Queen Charlotte portion of the continental margin showing the location of tectonic elements and the slab window in middle Tertiary time. Offshore is the Pacific–Farallon ridge system and the two respective oceanic plates. The Pacific–Farallon slab window is a narrow sliver along the continental margin (in hachure) coincident with the Queen Charlotte basin (QCB) in middle Tertiary time. Other tectonic elements include Queen Charlotte fault (QCF), Farallon subduction zone (FSZ), San Andreas fault (SAF), and North America plate (NAP).
Published: 31 May 2001
. The other inset is a cartoon map view of the Queen Charlotte portion of the continental margin showing the location of tectonic elements and the slab window in middle Tertiary time. Offshore is the PacificFarallon ridge system and the two respective oceanic plates. The PacificFarallon slab window
Image
 Figure 4. Schematic evolutionary model of plate boundaries off Baja California from 15 to 7 Ma, assuming a fixed North American plate (NAM; full circle). Propagation of slab window is shown in light gray. 1—At 15 Ma, subduction between Farallon plate (FAR) and NAM is subperpendicular to trench. Pacific plate (PAC) moves at 52 mm/yr (Atwater and Stock, 1998); Pacific-Farallon ridge spreads at 156 mm/yr (Fig. 3). 2—As break-off of the young Farallon slab propagates southward, Farallon plate breaks into Guadalupe (GUA) and Magdalena (MAG) plates. GUA slows rapidly relative to PAC. Farther south, diminishing slab pull induces increasing coupling between MAG and NAM, causing clockwise change in spreading direction between MAG and PAC. Subduction of MAG relative to NAM slows and becomes oblique. 3—At 10 Ma, north of Shirley fracture zone (FZ) subduction has stopped and dextral shear occurs. Extension is predicted at junction between Shirley FZ and trench. South of Shirley FZ, spreading ridge segments reorganize perpendicular to PAC-NAM direction of motion; very oblique subduction still produces compression along trench. 4—At 8 Ma, MAG-NAM subduction and MAG-PAC seafloor spreading progressively stop from north to south while Tosco-Abreojos propagates to south, all boundaries accommodating PAC-NAM motion. 5— After 8–7 Ma, MAG-PAC seafloor spreading and MAG-NAM subduction cease concomitantly while strike-slip motion along Tosco-Abreojos fully accommodates PAC-NAM motion.
Published: 01 January 2006
. Pacific plate (PAC) moves at 52 mm/yr ( Atwater and Stock, 1998 ); Pacific-Farallon ridge spreads at 156 mm/yr ( Fig. 3 ). 2—As break-off of the young Farallon slab propagates southward, Farallon plate breaks into Guadalupe (GUA) and Magdalena (MAG) plates. GUA slows rapidly relative to PAC. Farther south
Image
Colored curves and gray bands represent averaged half-spreading rates and 95% confidence intervals, respectively, deduced from the magnetic profiles located in areas defined in Figure 2 and according to the age model of different authors (ordered from top to bottom): Cande and Kent (1995, purple line), Geologic Time Scale 2004 (GTS2004; Ogg and Smith, 2004, brown line), Geologic Time Scale 2012 (GTS2012; Ogg, 2012, green line), Westerhold et al. (2017, red line), and this study (Contessa Road–Bottaccione composite section and Smirra 1, blue line). Numbers of profiles used for each area and magnetochron are reported on Table 2. Note that 95% confidence intervals deduced from a small number of profiles may be artificially small and not representative of the overall spatial spreading rate variability and uncertainty. For Central Indian Ridge and South East Indian Ridge, the dark thick curves show the spreading rates associated with the north (solid line) and south (dotted lines) flanks. Black solid and dotted lines represent published spreading rate curves and their 95% confidence interval deduced from rotation parameters that have been adjusted to each age model (Central Indian Ridge and South East Indian Ridge from Cande and Patriat [2015] and Pacific-Farallon Ridge and Pacific Antarctic Ridge from Wright et al. [2016b]).
Published: 01 November 2018
Indian Ridge and South East Indian Ridge from Cande and Patriat [2015] and Pacific-Farallon Ridge and Pacific Antarctic Ridge from Wright et al. [2016b] ).
Book Chapter

Author(s)
D.C. Engebretson
Series: Miscellaneous Publication
Published: 01 January 1987
DOI: 10.32375/1987-MP37B.2
EISBN: 9781733984423
... within the Farallon plate. In addition, reorganizations along ridges and transforms of the Pacific-Farallon boundary likely created bathymetric irregularities that descended into nearby trenches. Other bathymetric structures associated with the original rifting within the Farallon plate to form the Kula...
FIGURES
Published: 01 January 2007
DOI: 10.1130/2007.2430(23)
... in the Early Cretaceous when accretion of the Insular terrane to the North American Cordillera and the Median Tectonic arc to New Zealand stalled migration of the Pacific-Farallon and Pacific-Phoenix ocean ridges, leading to the generation of the Ontong Java, Manahiki, Hikurangi, and Hess Rise oceanic plateaus...
Journal Article
Published: 01 November 2008
The Journal of Geology (2008) 116 (6): 587–598.
... spreading along at least three ridge systems associated with divergence between the Pacific Plate and the Izanagi (west and northwest), Phoenix (south), and Farallon (east) plates. Subduction of Pacific Plate lithosphere along the western margin, beneath the Mariana, Izu-Bonin, Japan, Kurile, and Kamchatka...
FIGURES | View All (6)
Image
Time-slice depictions of tectonic events. (A) Asymmetric rifting of Rodinia left a series of seaward-dipping normal faults along the passive margin of western Laurentia. Idaho occupied an upper-plate segment of continental rift system; see Figure 1A inset. Note the deep marine setting of Wallowa arc. (B) Seafloor connected to Laurentia subducts westward during rifting of Pangea. Olds Ferry arc forms above westward-subducting oceanic crust, e.g., Bronson Hill arc of Valley et al. (2020). (C) Opposing forces generated by Pacific–Farallon ridge (P–FR) and mid-Atlantic ridge (MAR) drove the island arcs together. Terranes shown in approximate positions prior to ~60° clockwise rotation (Wilson and Cox, 1980). (D) The narrow upper plate rift margin choked subduction during early accretion of the Blue Mountains province, allowing for exploitation of rift architecture. Imbricate thrusting across eastern Olds Ferry terrane caused anatectic melting (Hazard Creek complex zircon locality 03KG22), amphibolite-facies metamorphism (Pollock Mountain garnet locality 422), and pervasive ductile deformation (LS tectonite). (E) Margin-parallel northward transport was coeval with movement along the Pollock Mountain thrust; see accretion/translation orogenic phase of arc–continent collision in western Banda orogen (Harris, 1991, 2011) and Teslin suture zone (Hansen, 1988, 1989). (F) Brittle normal fault reactivation of accretion-related fabric (S1 of Gray et al., 2020) during Basin-and-Range extension. IB—Idaho batholith. Modified from Lister et al. (1986), Lund et al. (2010), and Kurz et al. (2017).
Published: 22 February 2024
setting of Wallowa arc. (B) Seafloor connected to Laurentia subducts westward during rifting of Pangea. Olds Ferry arc forms above westward-subducting oceanic crust, e.g., Bronson Hill arc of Valley et al. (2020) . (C) Opposing forces generated by PacificFarallon ridge (P–FR) and mid-Atlantic ridge (MAR
Published: 01 January 2007
DOI: 10.1130/2007.2430(22)
... (1970) . These authors showed that these lineations display two trends. Lineations that strike approximately north-south young to the east and record spreading along the Pacific-Farallon Ridge, with the Farallon plate moving east relative to the Pacific. The direction of relative motion between...
Journal Article
Journal: Geosphere
Published: 01 February 2006
Geosphere (2006) 2 (1): 11–34.
... ), and most of these forearc igneous provinces have been attributed to ridge-trench interactions, or the effects of a nearby ridge. Most of the Paleogene tectonic reconstructions for the Pacific Basin involve the Farallon, Kula, and Pacific plates (e.g., Engebretson et al., 1985 ; Stock and Molnar, 1988...
FIGURES | View All (16)
Journal Article
Journal: GSA Bulletin
Published: 01 May 1980
GSA Bulletin (1980) 91 (5): 263–271.
...J. MAMMERICKX; E. HERRON; L. DORMAN Abstract Two different sets of extinct spreading ridge segments (Pacific-Farallon and Pacific-Nazca) are identified from bathymetric and magnetic data in the southeast Pacific. The older set is composed of several topographically subdued segments of a fossil...
Journal Article
Journal: GSA Bulletin
Published: 01 October 1977
GSA Bulletin (1977) 88 (10): 1404–1420.
...RICHARD HEY Abstract Magnetic and bathymetric data from the eastern Pacific have been analyzed and a model for the evolution of the Galapagos region developed. The Farallon plate appears to have broken apart along a pre-existing Pacific-Farallon fracture zone, possibly the Marquesas fracture zone...