Ultramafic tectonite of the Miyamori ophiolitic complex in the Kitakami Mountains, Northeast Japan: hydrous upper mantle in an island arc

1988 ◽  
Vol 99 (2) ◽  
pp. 159-175 ◽  
Author(s):  
Kazuhito Ozawa
Keyword(s):  
Upper Mantle ◽  
Island Arc ◽  
Ophiolitic Complex

scholarly journals The Imbert Formation of northern Hispaniola: a tectono-sedimentary record of arc-continent collision and ophiolite emplacement in the northern Caribbean subduction-accretionary prism

2015 ◽  
Vol 7 (2) ◽  
pp. 1827-1876 ◽  
Author(s):  
J. Escuder-Viruete ◽  
A. Suárez-Rodríguez ◽  
J. Gabites ◽  
A. Pérez-Estaún
Keyword(s):  
Subduction Zone ◽  
Continental Margin ◽  
Middle Eocene ◽  
Accretionary Prism ◽  
Island Arc ◽  
Caribbean Island ◽  
Stratigraphic Sequence ◽  
Oblique Collision ◽  
The Caribbean ◽  
Ophiolitic Complex

Abstract. In northern Hispaniola, the Imbert Formation (Fm) has been interpreted as an orogenic "mélange" originally deposited as trench-fill sediments, an accretionary (subduction) complex formed above a SW-dipping subduction zone, or the sedimentary result of the early oblique collision of the Caribbean plate with the Bahama Platform in the middle Eocene. However, new stratigraphical, structural, geochemical and geochronological data from northern Hispaniola indicate that the Imbert Fm constitutes a coarsening-upward stratigraphic sequence that records the transition of the sedimentation from a pre-collisional forearc to a syn-collisional piggy-back basin. This piggy-back basin was transported on top of the Puerto Plata ophiolitic complex slab and structurally underlying accreted units of the Rio San Juan complex, as it was emplaced onto the North America continental margin units. The Imbert Fm unconformably overlies different structural levels of the Caribbean subduction-accretionary prism, including a supra-subduction zone ophiolite, and consists of three laterally discontinuous units that record the exhumation of the underlying basement. The distal turbiditic lower unit includes the latest volcanic activity of the Caribbean island arc; the more proximal turbiditic intermediate unit is moderately affected by syn-sedimentary faulting; and the upper unit is a (caotic) olistostromic unit, composed of serpentinite-rich polymictic breccias, conglomerates and sandstones, strongly deformed by syn-sedimentary faulting, slumping and sliding processes. The Imbert Fm is followed by subsidence and turbiditic deposition of the overlying El Mamey Group. The 40Ar / 39Ar plagioclase plateau ages obtained in gabbroic rocks from the Puerto Plata ophiolitic complex indicate its exhumation at ∼ 45–40 Ma (lower-to-middle Eocene), contemporaneously to the sedimentation of the overlying Imbert Fm. These cooling ages imply the uplift to the surface and submarine erosion of the complex to be the source of the ophiolitic fragments in the Imbert Fm, during of shortly after the emplacement of the intra-oceanic Caribbean island-arc onto the continental margin.

scholarly journals Relation of crustal and upper mantle deformation beneath Sunda-Banda Island Arc inferred from shear-wave splitting analysis

2019 ◽  
Vol 1204 ◽  
pp. 012069
Author(s):  
Syuhada Syuhada ◽  
Nanang Tyasbudi Puspito ◽  
Titi Anggono ◽  
Nugroho Dwi Hananto ◽  
Hendra Grandis ◽  
...  
Keyword(s):  
Shear Wave ◽  
Upper Mantle ◽  
Shear Wave Splitting ◽  
Island Arc ◽  
Wave Splitting

scholarly journals Crustal and upper mantle structure in the Ryukyu Island Arc deduced from deep seismic sounding

1990 ◽  
Vol 102 (3) ◽  
pp. 631-651 ◽  
Author(s):  
T. Iwasaki ◽  
N. Hirata ◽  
T. Kanazawa ◽  
J. Melles ◽  
K. Suyehiro ◽  
...  
Keyword(s):  
Upper Mantle ◽  
Island Arc ◽  
Deep Seismic Sounding ◽  
Ryukyu Island ◽  
Mantle Structure ◽  
Upper Mantle Structure ◽  
Seismic Sounding

Continental Crust, Crustal Underplating, and Low-Q Upper Mantle Beneath an Oceanic Island Arc

Science ◽  
1996 ◽  
Vol 272 (5260) ◽  
pp. 390-392 ◽  
Author(s):  
K. Suyehiro ◽  
N. Takahashi ◽  
Y. Ariie ◽  
Y. Yokoi ◽  
R. Hino ◽  
...  
Keyword(s):  
Continental Crust ◽  
Upper Mantle ◽  
Oceanic Island ◽  
Island Arc
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