Transfonn continental margins have been subject of recent attention for two reasons. Firstly, transfonn faults represent the third category of major plate boundaries and are less understood than the two other major plate boundaries, (divergent and convergent). Secondly, the precise study of transfo...
dandeRemote sensing elaboration of ultramafic rocks of Mt. La Queglia and rock-type distribution. The stars represent the sampling points: orange star: rock-type 1 facies a; yellow star: rock-type 1 facies b; pink star: rock-type 2 facies c; purple star: rock-type 2 facies...
(5) After the end-ofJurassic seaward step-out of the Farallon-North American convergent plate junction,terrigineous debris began to be deposited in the outboard Franciscan trench and intervening Great Valley forearc.(6) Voluminous sedimentation and accretion of Franciscan Eastern + Central belts and...
Summary Palaeoproterozoic reworked volcaniclastic deposits, basaltic andesitic to rhyolitic pyroclastics and lava flows in the central part of the Fennoscandian Shield, western Finland, constitute part of the volcanic zones of the Svecofennian Domain, which formed in a convergent tectonic setting and...
It is concluded that all mafic rocks from this locality derive from the erosion of an oceanic plutono-volcanic complex of MORB affinity that was reworked in a block matrix m茅lange and emplaced as turbidites and debris flows during the Mesozoic. We propose a convergent plate margin setting for...
Deep-sea turbidite sedimentation in convergent margin settings generally is controlled by tectonic uplift, climate and eustatic sea-level variations. The rate of tectonic uplift governs the relief of the source area and the position of the base level (coinciding with sea-level), climate influences ...
The rhyodacites are also strongly depleted (Nd(t) of 11.1 to 5.9) and include adakite. P-T calculations indicate that primary magmas were formed at ~1300-1350C and 30-45 km, consistent with sub-crustal depths that existed before underplating of oceanic lithosphere beneath southern Alaska as ...
Convergent margin tectonics of the South China Sea near southern Taiwan is characterized by a progressively northward transition from oceanic subduction along the Manila Trench to the incipient collision zone offshore southern Taiwan where the continental crust of the Eurasian plate subducts beneath the ...
A long-lived convergent margin along southern Laurentia is now well accepted; but lithospheric extension and basin development can be interrupted by intermittent subduction of buoyant oceanic plateaus while the cyclicity depends on the frequency of plateau arrivals. Convergence with a protracted extension ...
(5) After the end-of-Jurassic seaward step-out of the Farallon-North American convergent plate junction, terrigineous debris began to be deposited in the outboard Franciscan trench and intervening Great Valley forearc. (6) Voluminous sedimentation and accretion of Franciscan Eastern + Central ...