Sediment tectonic setting

Tectonic setting Back-arc rift or continental rift Sediment-barren midoceanic Sediment-covered... 

The present-day age distribution pattern of the oceanic crust is well known (Sprague and Pollack, 1980 Sclater et al., 1981 Rowley, 2002), and the plate tectonic concept of ocean floor generation/ subduction well established. The age distribution pattern (Figure 3) conforms to systematics with a half-life (T50) of —60 Myr, translating to gener-ation/destruction of —3.5 km (or —20 km ) of oceanic crust per year. The maximal life-span Tmax (oblivion age) for its tectonic settings and their associated sediments is therefore less than 200 Myr. 

Is the proposition that differential recycling of sediments is controlled by tectonic settings supported by the observational data Could this... 

The overall outcome is a depletion of the labile Ca-Na plagioclases in the sediments of progressively more stable tectonic settings, the trend being more pronounced in the fine-grained muddy sediments than in their coarser counterparts (Figure 13). 

Sedimentation during the Triassic and Jurassic in the Gulf of Mexico Basin was controlled primarily by rift margin tectonics (Mancini et a/. 1985, 1990 Salvador 1987). The regional tectonic setting was... 

The input parameters for the model include the present-day sedimentary cross section, estimates of the amplitude and rate of erosion, the lithological composition and petrophysical characteristics of rocks, the structure of the lithosphere (basement) and its rock parameters, paleotemperature markers (vitrinite reflectance), paleoclimate, sea paleodepths, present-day surface heat flow, depth-temperature profiles, and information on the paleotectonics and the present-day tectonic setting of the basin. The evolution of the Oued el-Mya Basin is used to demonstrate the model. Table 6.1 presents the basin s main stages of evolution, which include sedimentation, hiatus, and erosion. 

Discrimination diagrams have also been applied to the environment of deposition of sedimentary rocks. Potter et al. (1965) showed that a discriminant function based upon the trace elements B and V could be used to distinguish between freshwater and marine argillaceous sediments. More recently tectonic discrimination diagrams have also been extended to sedimentary rocks. Bhatia (1983) and Roser and Korsch (1988) have produced discriminant function diagrams which allow the identification of the provenance of sandstones according to their plate tectonic setting. 

Plate tectonic processes impart a distinctive geochemical signature to sediments in two separate ways. Firstly, different tectonic environments have distinctive provenance characteristics and, secondly, they are characterized by distinctive sedimentary processes. Sedimentary basins may be assigned to the following tectonic settings (Bhatia and Crook, 1986) ... 

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