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Osa Melange

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Series: Geological Society, London, Special Publications
Published: 01 January 2009
DOI: 10.1144/SP328.17
EISBN: 9781862395763
... ) and (2) the Osa Mélange (originally defined as the ‘Osa Caño Accretionary Complex’ by Di Marco 1994 ) (Fig.  2 ). We first propose here that the Osa Igneous Complex is not limited to the Osa Peninsula but extends toward the SE in the Burica Peninsula and, possibly, islands in the Montijo Gulf (western...
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Image
A: Geological map of <b>Osa</b> <b>mélange</b> from Bahia Drake (as shown in the figure) ...
in > Geology
Published: 15 February 2018
Figure 2. A: Geological map of Osa mélange from Bahia Drake (as shown in the figure) to Playa San Josecito (Costa Rica) (thrust fault from Vannucchi et al. [2006] , and inland mapping of Rio Claro valley from Buchs et al. [2009] ). Location of this map segment is shown on geological map of Osa
Journal Article
Journal: Lithosphere
Published: 01 June 2013
Lithosphere (2013) 5 (3): 247-264.
... aseismic Cocos Ridge where relief locally exceeds 1 km. Modern topography of the Osa Peninsula, elevation of the basement rocks (Early to Middle Tertiary Osa mélange), elevations of Quaternary marine deposits (Marenco formation), and distribution of late Quaternary uplift rates directly mirror...
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Journal Article
Journal: Geology
Published: 15 February 2018
Geology (2018) 46 (4): 367-370.
...Figure 2. A: Geological map of Osa mélange from Bahia Drake (as shown in the figure) to Playa San Josecito (Costa Rica) (thrust fault from Vannucchi et al. [2006] , and inland mapping of Rio Claro valley from Buchs et al. [2009] ). Location of this map segment is shown on geological map of Osa...
FIGURES
Series: GSA Special Papers
Published: 01 January 1995
DOI: 10.1130/SPE295-p1
... toward the Middle America Trench by the Tertiary Osa-Caño Accretionary Complex. The paleomagnetic data are derived from Upper Cretaceous and Paleocene pelagic limestones. The Chorotega Terrane constitutes most of the southern Middle American Landbridge and was the western edge of the Caribbean plate...
Journal Article
Published: 19 September 2019
Journal of the Geological Society (2019) jgs2019-081.
... that subduction of heterogeneous material with strong competency contrast and variable incompetent/competent ratio, such as chaotic deposits and sedimentary or tectonic mélanges, can explain the variability of slip style and seismic character observed in subduction zones from creep to seismic slip through tremors...
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Series: Geological Society, London, Special Publications
Published: 01 January 2008
DOI: 10.1144/SP.308.4
EISBN: 9781862395565
... defined as the Lurio Supergroup by Pinna et al. (1993) and consists of a tectonic mélange ( Thomas et al. 2006 ). The main rock types are mostly granulitic gneisses of tonalitic, dioritic and granitic composition, amphibolitic and granulitic gneisses as well as ultramafic and metaluminous gneiss...
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Image
Conceptual model of frontal accretion of seamount moat sediments adjacent t...
in > Geology
Published: 15 February 2018
accretion and development of frontal accretionary prism, even in otherwise non-accretionary subduction zones. This is the setting in which Osa mélange formed. Blue ticked line shows subduction accretion. C: Subduction of seamount (green) leading to increased local subduction erosion of upper plate (e.g
Image
Tectonic evolution of the Pacific coast of Costa Rica for the past 1 m.y. T...
Published: 01 July 2009
gray—Paleogene to recent deposits; black—Nicoya Complex and Osa mélange (undifferentiated); circles with spokes—volcanoes. (A) 1 Ma: Convergent margin with a laterally continuous lower slope, forearc basin, and volcanic arc. (B) 500 ka: Subduction of seamounts and plateaus resulting in scalloping
Journal Article
Journal: Geology
Published: 01 January 2007
Geology (2007) 35 (1): e162.
.... Gardner T.W. 2006 , From seamount accretion to tectonic erosion: Formation of Osa Melange and the effects of Cocos Ridge subduction in southern Costa Rica : Tectonics , v. 25 , TC2004 , doi: 10.1029/2005TC001855 . von Huene R. Ranero C.R. 2003 , Subduction erosion and basal...
Journal Article
Journal: Geology
Published: 01 May 2016
Geology (2016) 44 (5): 383-386.
... OIC and are locally in contact with the Osa Mélange and inner OIC (Fig. DR1). Pelagic limestones interbedded with pillow lavas and peperites of group 1 define Campanian to middle Eocene ages of formation ( Buchs et al., 2009 ). The absence of suprasubduction geochemical characteristics (e.g., low Nb...
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Journal Article
Journal: GSA Bulletin
Published: 01 July 2009
GSA Bulletin (2009) 121 (7-8): 992-1012.
... gray—Paleogene to recent deposits; black—Nicoya Complex and Osa mélange (undifferentiated); circles with spokes—volcanoes. (A) 1 Ma: Convergent margin with a laterally continuous lower slope, forearc basin, and volcanic arc. (B) 500 ka: Subduction of seamounts and plateaus resulting in scalloping...
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Journal Article
Journal: Geology
Published: 01 September 2011
Geology (2011) 39 (9): 819-822.
.... Gardner T.W. , 2006 , From seamount accretion to tectonic erosion: Formation of Osa Melange and the effects of Cocos Ridge subduction in southern Costa Rica : Tectonics , v. 25 TC2004 , doi:10.1029/2005TC001855 . Wang K. , 2010 , Finding faults in fault zones : Science , v. 329 , p...
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Series: GSA Special Papers
Published: 28 December 2018
DOI: 10.1130/2018.2540(27)
EISBN: 9780813795409
... England outcrops since the prism commonly lowers after the ridge has passed (see Appendix B ). Element 1b ( significantly more deformation in the accretionary prism where the aseismic ridge intersects the prism ) was proposed as an explanation for the Taconic Dunnage Mélange in Newfoundland, but more...
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Journal Article
Journal: Geology
Published: 01 April 2011
Geology (2011) 39 (4): 335-338.
... , 240 p . Buchs D.M. Baumgartner P.O. Baumgartner-Mora C. Bandini A.N. Jackett S.-J. Diserens M.-O. Stucki J. , 2009 , Late Cretaceous to Miocene seamount accretion and mélange formation in the Osa and Burica Peninsulas (southern Costa Rica): Episodic growth...
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Journal Article
Published: 01 January 2013
Bulletin de la Société Géologique de France (2013) 184 (1-2): 35-45.
....-O. Stucki J. ( 2009 ). – Late Cretaceous to Miocene seamount accretion and melange formation in the Osa and Burica peninsulas (southern Costa Rica); episodic growth of a convergent margin . In : James K.H. Lorente M.A. Pindell J.L. , Eds., The origin and evolution...
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Journal Article
Journal: GSA Bulletin
Published: 01 May 2012
GSA Bulletin (2012) 124 (5-6): 989-1006.
... grading into the more normal, well-bedded, and unsheared Valdez Group. Figure 7. Structural section across the Eagle River fault zone showing the transition between the McHugh Complex and the Valdez Group. Note the presence of bedded cherts and mélanges that are not common in either the Graywacke...
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Journal Article
Published: 18 April 2018
Geological Magazine (2019) 156 (4): 683-701.
...@cdut.edu.cn The Lhasa terrane is bound to the north by the Banggong–Nujiang Suture Zone (BNSZ) and to the south by the Yarlung–Zangbo Suture Zone (YZSZ; Fig. 1b ; Yin & Harrison, 2000 ). It can be divided into northern, central and southern subterranes by the Shiquan River–Nam Tso Mélange Zone (SNMZ...
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Journal Article
Journal: GSA Bulletin
Published: 20 March 2019
GSA Bulletin (2019) 131 (9-10): 1555-1580.
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Series: AAPG Memoir
Published: 01 January 2003
DOI: 10.1306/M79877C6
EISBN: 9781629810546
... these accreted rocks reveals that most are arc related. However, the Margot Formation exposed in northwestern Cuba as part of the Northern Ophiolitic Melange ( Iturralde-Vinent, 1994 ), possesses geochemical characteristics of oceanic-plateau basalts, i.e., flat REE to slightly LREE-enriched patterns ( Figure 3e...
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