Showing papers in "Earth and Planetary Science Letters in 2004"

TL;DR: In this paper, a cross-calibration of U-Pb and Lu-Hf isotopic systems on mineral fractions from the Proterozoic Karlshamn and Sorkka dolerites in Sweden and Finland is presented.

TL;DR: In this paper, the best dated and most complete African mammal fossil databases indicate African faunal assemblage and speciation changes during the Pliocene-Pleistocene interval (the last ca. 5.3 million years) were mediated by changes in African climate or shifts in climate variability.

TL;DR: In this paper, a tracer for terrestrial organic carbon in sediments based on the analysis of tetraether lipids using high-performance liquid chromatography/mass spectrometry (HPLC/MS) was proposed.

TL;DR: In this paper, the authors report the occurrence of potassic adakites from south Tibet in an orogenic belt produced by the Indo-Asian continent collision, which occurs in a postcollisional extensional setting.

TL;DR: In this paper, it was shown that H2O-rich, Cl-poor, alkali-aluminosilicate-bearing fluid is fundamental to element transport in the mantle wedge.

TL;DR: In this paper, the smallest number of grains in a sample that must be dated to achieve a required level of statistical adequacy is calculated, i.e., if no fraction of the population comprising more than 0.05 of the total is missed at the 95% confidence level, at least 117 grains should be dated.

TL;DR: In this article, a chemo-thermo-dynamic subduction zone model was proposed to solve for slab dehydration during subduction, and the authors investigated how changes in the incoming plate's hydration and thermal structure may effect the efficiency of sub-arc water release from sediments, crust, and serpentinized mantle.

TL;DR: In this paper, the authors present new profiles of mantle viscosity derived on the basis of nonlinear, Occam-style joint inversions of an extensive set of data associated with mantle convection and glacial isostatic adjustment (GIA).

TL;DR: In this article, two general mechanisms are recognized: induced and spontaneous nucleation of subduction zones, i.e., induced nucleation (INSZ) responds to continuing plate convergence following jamming of a subduction zone by buoyant crust.

TL;DR: In this paper, a new polymorph of MgSiO3 more stable than the Pbnm-perovskite phase has been identified by first-principles computations.

TL;DR: In this article, the authors presented new rare earth element (REE) plus yttrium (Y) data for two distinct suites of early Archaean metamorphosed rocks from southern West Greenland, whose interrelationships have been much debated in recent literature.

TL;DR: In this article, the authors used cosmogenic nuclide and geochemical mass balance methods to measure long-term rates of chemical weathering and total denudation in granitic landscapes in diverse climatic regimes.

TL;DR: In this paper, a histogram of heat-flow values determined from existing measurements obtained from regions that are structurally similar to the target point is generated based on a "structural similarity functional" to quantify the structural analogy between different regions.

TL;DR: In this paper, the phase relations of carbonate-bearing eclogite assemblages from 2.5 to 8.5 GPa were investigated and the results indicated that carbonated peridotite is a more likely source of magmatic carbon in oceanic provinces.

TL;DR: In this article, the best-exposed lava succession in the western ELIP is studied in order to further constrain their petrogenesis and plume-lithosphere interaction.

TL;DR: In this article, a mechanistic model for the distribution of methane clathrate in marine sediments, and use it to predict the sensitivity of the steady-state methane inventory to changes in the deep ocean.

TL;DR: In this article, the phase rule and heterogeneous equilibrium were shown to hold for all three bulk compositions of the mid-ocean ridge basalt (MORB), a greywacke, and a pelite with excess H2O of 0.4-1.4 wt.

TL;DR: In this paper, the authors determined the timing and kinematics of rifting in the 3rd arm, the Main Ethiopian rift (MER), near its intersection with the southern Red Sea rift.

TL;DR: Barling et al. as mentioned in this paper conducted an experimental investigation into the mass-dependent fractionation of Mo isotopes during adsorption onto Mn oxyhydroxide and found that the isotope offset between dissolved and adsorbed Mo is comparable to that observed between Mo in seawater and Mo in ferromanganese nodules and crusts.

TL;DR: In this paper, a trace-element systematics analysis of the mid-ocean ridge basalt (MORB) has been conducted and it has been shown that a small proportion of the basalt is enriched in incompatible elements (e.g., thoracic acid), which can result from continuous processes of formation and destruction of enriched sources by melting and convective mixing.

TL;DR: In this model, the young Sun is surrounded by a disk of gas and fine dust grains, which stick together to form mountain-size bodies called planetesimals.

TL;DR: In this article, the onset of mountain building in the western part of the Himalayan orogenic belt has been documented in the synorogenic stratigraphic record of northern Pakistan and India as Early to Middle Eocene (~52 Ma).

TL;DR: In this paper, high resolution records of atmospheric CO2 concentration during the Holocene are obtained from the Dome Concordia and Dronning Maud Land (Antarctica) ice cores.

TL;DR: In this article, the gas hydrate stability zone (GHSZ) from the seafloor to its base was sampled during Leg 204 of the Ocean Drilling Program (ODP) to the accretionary complex of the Cascadia subduction zone.

TL;DR: In this article, high precision measurements of Nb/Ta, Zr/Hf, and Lu /Hf ratios together with 176 Hf/ 177 Hf analyses on arc rocks from Kamchatka and the western Aleutians were performed to investigate the properties of HFSE in subduction regimes closer.

TL;DR: In this paper, the authors developed a one dimensional, non-steady state, transport reaction model to simulate the observed chloride enrichment at Site 1249 and showed that in order to reach the observed high chloride values, methane must be transported in the gas phase from the depth of the BSR to the seafloor.

TL;DR: In this paper, geochemical data on the water contents of western US lavas and mantle xenoliths, compared these data to water solubility in olivine, and calculate the corresponding effective viscosity of olivines, the major constituent of the upper mantle, using a power law creep rheological model.

TL;DR: In this article, the authors used laser 40Ar/39Ar age and geochemical data from igneous rocks from southern Spain, the Alboran Sea and northern Morocco to reconstruct the magmatic evolution of the westernmost Mediterranean since the Eocene.

TL;DR: In this article, the authors used a three-parameter inverse-gamma distribution, which fits the frequency-based area statistics of three substantially dcomplete landslide-event inventories.

TL;DR: In this article, the authors suggest that this concentrated loss of material was accommodated by motion along a back-stepping thrust to the south and a normal fault zone to the north as part of an extruding wedge.