Showing papers in "Earth and Planetary Science Letters in 2012"

TL;DR: For example, Pujol et al. as mentioned in this paper proposed that the Earth is not as volatile-poor as previously thought, and showed that it contains up to 2 (± 1) % contribution of carbonaceous chondrite (CI-CM) to a dry proto-Earth.

TL;DR: The existence of a pre-Rodinia Precambrian supercontinent, variously called Nuna or Columbia, has been widely speculated in the past decade, but the precise timing of its existence and its configuration have been uncertain due to the lack of unequivocal paleomagnetic and geological constraints as mentioned in this paper.

TL;DR: In this article, the authors present a dis- tribution of high-resolution glaciologically self-consistent deglacial histories for the North American ice com- plex calibrated against a large set of RSL, marine limit, and geodetic data.

TL;DR: In this paper, the authors present U-Pb zircon (and baddeleyite) ages for fourteen new samples of Karoo LIP sills and dykes spaced by as much as 1100 km across the half million square kilometer Karoo Basin.

TL;DR: In this article, gold deposits from the Xiaoqinling district, southern NCC, bracket their emplacement in the range of 154.1 ± 1.1 to 118.9± 1.2 million years, postdating formation of the craton by 1.7 billion years.

TL;DR: In the Lomagundi Event as mentioned in this paper, marine carbonates recorded the largest and longest uninterrupted positive carbon isotope excursion, the earliest extensive marine sulfate evaporites were deposited, and the average ferric iron to total iron (expressed as Fe 2 O 3 /∑Fe |Fe2O3| ) ratio of shales increased dramatically.

TL;DR: In this paper, the authors revisited the early evolution of the Moon's bombardment and showed the timeline of the lunar bombardment has a sawtooth-like profile, with an uptick in the impact flux near ∼ 4.1 Gy ago.

TL;DR: In this article, the authors use cluster analysis to identify structures and seismic characteristics common to a set of recent global tomographic models which have been derived using different data sets, parameterizations, and theory behind approximations used in inversion.

TL;DR: In this paper, the authors present a new planktic foraminiferal δ11B record from 16.6 to 11.8Ma from two deep ocean sites currently in equilibrium with the atmosphere with respect to CO2, and demonstrate that the evolution of global climate during the middle Miocene was well correlated to variations in the concentration of atmospheric CO2.

TL;DR: In this paper, a review of recent literatures shows that grain-size sensitive anelastic relaxation inevitably has two successive processes, high-frequency elastically accommodated grain-boundary sliding followed by low-frequency diffusion-accommodated aelasticity.

TL;DR: Bristow et al. as mentioned in this paper determined Arrhenius parameters for solid-state reordering of C-O bonds in two different calcites through a series of laboratory heating experiments.

TL;DR: In this paper, the partitioning of 15 major to trace metals between monosulfide solid solution (MSS), sulfide liquid (SL) and mafic silicate melt (SM) was determined in piston-cylinder experiments performed at 1175- 1300 1C, 1.5-3.0 GPa and oxygen fugacities ranging from 3.1 log units below to 1.0 log units above the quartz-fayalite-magnetite fO2 buffer, which conditions are representative of partial melting in the upper mantle in different

TL;DR: In this article, the authors measured olivine-hosted melt inclusions from a single eruption of Agrigan volcano, Marianas, in order to test the influence of differentiation processes vs. source conditions on the Fe{sup 3+}/{Sigma}Fe ratio, a proxy for system oxygen fugacity.

TL;DR: In this article, the authors show that shear wave velocity anomalies do not require, and are most likely incompatible with, large-scale compositional heterogeneity, which is not expected for purely thermal structures.

TL;DR: In this paper, the authors present a new multiproxy (TEX86, δ18O and Mg/Ca), marine temperature history for Canterbury Basin, eastern New Zealand, that extends from middle Paleocene to middle Eocene, including the Paleocene-Eocene thermal maximum (PETM) and early Eocene climatic optimum (EECO).

TL;DR: This article performed reaction experiments between partial melt of volatile-free MORB-eclogite and peridotite at 2.5-3 GPa, 1375-°C and 1440°C.

TL;DR: In this article, a detailed estimate of static coseismic surface offsets as measured by survey and continuous GPS, both in near and far-field regions, has been inferred from a Joint inversion of new data together with published GPS, InSAR, and land-level changes data using Green's functions generated by a spherical finite-element model with realistic subduction zone geometry.

TL;DR: In this paper, the authors used the 60Fe-60Ni decay system to establish the time of core formation on Vesta at 3.7 − 1.7 + 2.5 ym after condensation of calcium-aluminum-rich inclusions.

TL;DR: In this article, the authors derived, for the first time, consistent ice-mass trends and temporal variations within seven major drainage basins from gravity fields from the Gravity Recovery and Climate Experiment (GRACE), surface-ice velocities from Inteferometric Synthetic Aperture Radar (InSAR), and output of the regional atmospheric climate modelling (RACMO2/GR; Ettema et al., 2009), and surface-elevation changes from the Ice, cloud and land elevation satellite (ICESat).

TL;DR: The early Cambrian strata in South China record two prominent negative carbonate carbon isotope (δ13Ccarb) excursions of early Nemakit-Daldynian (N-D) and early Tommotian ages as mentioned in this paper.

TL;DR: In this article, the authors analyzed the impact of spatiotemporal climatic gradients on surface erosion in the Calchaquies basin of northwestern Argentina and identified an intrinsic channel-slope behavior in different climatic compartments.

TL;DR: In this article, the authors developed thermodynamic and mineral physics estimates of the crystallization pressure and differential stress resulting from volume changes during olivine hydration (serpentinization) and carbonation.

TL;DR: A detailed history of surface uplift along the southern margin of the Central Anatolian plateau from the Late Miocene to the present can be found in the Mut Basin, southern Turkey as discussed by the authors.

TL;DR: In this article, the authors present lithium, magnesium and silicon isotope ratios from pore waters and soils from a well-characterised Histic Andosol in south-west Iceland.

TL;DR: In this paper, the authors focus on a well-characterized upper crustal intrusion, the 15 km2 Lago della Vacca complex (LVC), Adamello batholith, N. Italy, and test this model using a dense sampling strategy and high-precision ID-TIMS U-Pb geochronology of zircon and titanite combined with hafnium isotope and trace element analyses of the same volume of dated mineral.

TL;DR: In this article, combined whole-rock and zircon MC-ICP-MS Lu-Hf isotope data are reported for a large collection of Archean granitoids belonging to typical tonalite-trondhjemite-granodiorite (TTG) suites.

TL;DR: In this paper, Olivine-hosted melt inclusions from a geochemically depleted shergottite (Yamato 980459, representing a very primitive Martian melt) possess undegassed water with a chondritic and Earth-like D/H ratio (δD≤275‰).

TL;DR: In this paper, an Eocene-Oligocene melting event in southern Tibet is documented, which forms a 150-km-long, NW-SE-trending granitoid belt along the Zedong-Lhunze traverse between the Indus-Yarlung suture (IYS) and the south Tibetan detachment (STD).

TL;DR: In this article, the authors presented an expanded East African lakes surface sediment brGDGT dataset based upon 111 lakes and examined three methods of calibrating brDGTs to MAAT.

TL;DR: In this article, the authors use the concentrations and isotope compositions of water, carbon, and sulfur in serpentinites and their dehydration products to trace the cycling of volatiles during subduction.