Titlebook: Crust/Mantle Recycling at Convergence Zones; Stanley R. Hart,Levent Gülen Book 1989 Kluwer Academic Publishers 1989 atmosphere.chemistry.g

尖叫

collagenase

Geochemical Evidence for Crust-To-Mantle Recycling in Subduction Zones, Chase, 1981; Hofmann and White, 1982; White and Hofmann, 1982; DePaolo, 1983; Dupre and Allegre, 1983; Weaver, et al., 1986), but it is by no means clear that this process is in fact responsible for all that it is called upon to account for.

粗语

Isotopic Characterization and Identification of Recycled Components,y of this heterogeneous character has been expanded over the intervening years with the application of new isotopic tracer systems (Nd, Hf, He, Xe) to volcanic rocks from most of the oceanic islands. Currently, this isotopic heterogeneity can be embraced as mixtures between four or five fairly disti

antipsychotic

Hydrothermal Alteration of the Oceanic Crust,nt contribution to the flux of material between the continent and the depleted mantle (Albarede and Michard, 1986). The subducted oceanic crust is expected to comprise widely different end-members: continent-derived sediments of which the abyssal clays are an important fraction, metalliferous ridge-

哭得清醒了

Lipoprotein

Geochemical Evidence for Crust-To-Mantle Recycling in Subduction Zones,e most part is derived from the continental crust. It also reacts with sea water and hydrothermal fluids produced from sea water, changing its composition. To the degree this sediment is subducted along with the basaltic portion of the oceanic crust, continental crust is recycled into the mantle. Th

西瓜

Kerguelen Archipelago: Geochemical Evidence for Recycled Material,from which oceanic basalts may be produced by variable mixing relationships, assuming that oceanic basalt isotope systematics reflect mixing. The existence of two additional components, BSE and PREMA, is also compatible with the observed isotopic heterogeneities in the mantle. The combinations of en

异教徒

Subduction of Young Lithosphere: Lithospheric Doubling, A Possible Scenario,ratification, rheology, and buoyancy. It is proposed that young oceanic lithosphere (< 20 Ma) and oceanic ridges, when being subducted upon being overridden by cool and strong (continental) lithosphere resides subhorizontally in the shallow upper mantle underneath a cooler upper lithospheric plate.

Original

Influx

Sediment Recycling at Convergent Margins: Constraints from the Cosmogenic Isotope 10Be,mogenic isotope .Be (T. = 1.5 million years) suggests that sediments are indeed recycled at some volcanic arcs. Further, the .Be data suggest that sediment subduction may be enhanced where topographic steps in the oceanic plate (fracture zones, seamount chains, grabens) are subducted. If all sedimen