Showing papers in "Earth and Planetary Science Letters in 1985"

TL;DR: In this article, detailed Cd/Ca and δ 13 C data have been obtained for benthic foraminifera from western North Atlantic and Equatorial Pacific sediment cores, which indicate that bottom waters overlying the Atlantic site have been nutrient depleted relative to those at the Pacific site over the last 215,000 years.

TL;DR: The ability of a melt to separate from the residual crystals depends principally on the viscosity of the melt as mentioned in this paper, and the ability of melt to move at small melt fractions depends on the viscous properties of the melts.

TL;DR: In this article, the authors conclude that the convecting upper mantle is a much more likely source as it will be well-stirred and unlikely to show any ocean-continent differences.

TL;DR: In this article, the suitability of some geothermometers for application to garnet lherzolite xenoliths and their limits of precision are discussed and the applicability to simple and complex systems is demonstrated and the modelling procedure briefly outlined.

TL;DR: In this paper, a group of rats grown from birth to death in identical conditions, but with different δ18O of drinking water (δw), were studied for variations of their body water and bone phosphate.

TL;DR: In this article, the authors presented a model for cooling, crystallization and contamination during the turbulent ascent of a komatiite, a picritic basalt and a tholeiitic basalt.

TL;DR: In this paper, the trace element enrichment of lamproites and group II kimberlites has been studied and a strong positive correlation between loweNd and206Rb/204Pb, which indicates that lowSm/Nd, and U/Pb ratios coexist within the subcontinental mantle.

TL;DR: In this article, the activity ratio (230Th/238U) was calculated for a simple model of melting, for which the melt fraction in chemical and radioactive equilibrium with the solid residium remains constant as melting proceeds.

TL;DR: In this paper, the concentrations of nine rare earth elements (REE) La, Ce, Nd, Sm, Eu, Gd, Dy, Er and Yb have been determined in mixed species assemblages of foraminifera tests taken from Atlantic Ocean sediment core tops.

TL;DR: In this paper, the authors proposed a tectonic model that can explain contemporaneous fluctuations in apparent sealevel in neighbouring depositional environments by an interaction between these stresses and the deflections of the lithosphere caused by sedimentary loading.

TL;DR: In this paper, the authors used a total inversion procedure applied successively to solution models and synthetic systems of increasing degrees of complexity to evaluate the best analogue of the natural system and to select an optimum thermodynamic model.

TL;DR: In this paper, the authors proposed that late Cretaceous blueschists formed during subduction under the active continental margin, and that continental collision and formation of the Indus Suture was in the Eocene.

TL;DR: A rifting model of the Japan arc is proposed in this article, which shows that Northeast Japan was apparently subjected to a counter-clockwise rotation through 47 ± 14° about a vertical axis on the representative point of Northeast Japan (141°E, 39°N) during the past 21 Ma.

TL;DR: In this paper, the authors show that there are differences in the bulk chemistry of peridotites which correspond to the amount of basaltic melt that has been extracted from them.

TL;DR: Palaeomagnetic results from the Himalayan Arc and Southern Tibet compared with simulated apparent polar wander paths for the Indian plate show a consistent pattern of rotations of the Indian Arc relative to the Indian Shield, varying gradually from 45° clockwise in the northwestern Himalaya to slightly counterclockwise in Lhasa region, consistent with continental underthrusting of India beneath the Tibetan Plateau since the Early Miocene over at least 650 km at the longitude of western Nepal and oroclinal bending since the latest Miocene as discussed by the authors.

TL;DR: In this article, the authors used isotope dilution technique to determine rare earth element abundances in the New Caledonian ophiolitic melting residues and proposed the sequential integrated disequilibrium melting model, which allows quantitative agreement with these data.

TL;DR: A 9 km length of one of the axial rift valleys of a Gulf of California spreading center was mapped by Deep Tow and examined on ten “Alvin” dives.

TL;DR: In most ophiolites, the ultramafic section is harzburgitic as discussed by the authors, and it is rarely composed of residual lherzolites, except for the local occurrence of impregnation lhersolites within harzbergitic massifs.

TL;DR: The Eolian island orogenic volcanism extends to the seamounts located on the western (Sisifo, Enarete, Eolo Seamounts) and the northeastern (Alcione, Lametini Seamount, and Elberich Seamount) sides of the emerged EOLIAN island arc, as well as on the upper part of Palinuro and Marsili seamounts, constituting a ring-like structure as mentioned in this paper.

TL;DR: In this article, the Akaki River section of the Troodos ophiolite complex was analyzed and the major elements, K, Rb, Cs, Sr, Ba, Sc, Cr, Ni, Hf, Ta, Th, and REE concentrations and isotopic compositions of carefully hand-picked volcanic glasses were reported.

TL;DR: In this article, it was shown that the 3.2 Ga age is incorrect and that the Sm-Nd array results from mixing between depleted mantle and either older continental crust or enriched mantle.

TL;DR: In this article, a suite of 16 Ca,Al-rich inclusions (CAIs) from 5 carbonaceous chondrites were analyzed and it was shown that Mo and W depletions are common in CAIs from carbonaceous CHs and that the depletion result from high temperature oxidation.

TL;DR: In this paper, stable isotope records from the Atlantic and Antarctic suggest that 13C depletion of the glacial North Atlantic may reflect higher preformed nutrients (due to bottom-water formation under sea and/or shelf ice) and increased residence time of northern-source water.

TL;DR: In this article, porewater δ 13 C profiles from four sites in the Central Equatorial Pacific Ocean were used to estimate carbon rain rates at two of these sites, MANOP sites C and S.

TL;DR: A compilation of published143Nd/144Nd data from recent Mn-nodules and marineFeMn deposits shows that the North Central Pacific Ocean and the major portion of the Atlantic Ocean display distinctly different, narrow ranges in isotopic compositions.

TL;DR: In this article, a link between orbital periodicities, variations of intense precipitation associated with specific paleogeographic situations and Cretaceous bedding patterns has been established for the sensitivity of the atmosphere-hydrosphere-lithosphere system to external forcing.

TL;DR: This article found microtektite-like spherules have been found in almost every core or outcrop with an iridium anomaly, forming a worldwide strewnfield, which is an excellent indicator of the K/T boundary level.

TL;DR: In this paper, different regonalized thermal evolution models are presented to determine the concentration of heat-producing elements such as U, Th, and K, which are required to have a present-day mantle potential temperature of 1350 C starting from a high temperature of 2000 C, 4.5 billion years ago and to calculate the thermal structure of the continental lithosphere through time.

TL;DR: In this paper, a large-scale partial melting of crustal material, dominantly of sedimentary origin, is proposed based on the combined data, which is probably the result of age differences in the source materials of the different leucogranites.

TL;DR: In this article, a model based on bathymetric mapping has revealed a near-harmonic distribution of intermediate wavelength morphologic highs on slow to fast spreading centers, which may result from the thermal instabilities generated by the interaction of cold fracture zone walls with the axial asthenosphere.