Showing papers in "Earth and Planetary Science Letters in 2000"

TL;DR: The tonalite-trondhjemite-granodiorite (TTG) series comprises silicic and sodic rocks that form a major component of preserved Archaean crust.

TL;DR: In this paper, a new compilation of heat flow data for the continental area of China has been constructed using both published data (up to 1999) as well as previously unpublished data.

TL;DR: Ocean Drilling Program Leg 176 deepened Hole 735B in gabbroic lower ocean crust by 1 km to 1.5 km as discussed by the authors, with evidence for two principal and many secondary intrusive events.

TL;DR: Authigenic carbonate nodules have been recovered from the same areas during the MEDINETH cruise in July 1999 as mentioned in this paper, and large 13C depletions of authigenic calcite, aragonite and dolomite indicate methane as a major carbon source for the carbonate.

TL;DR: In this paper, a two-dimensional thermo-mechanical laboratory modelling of continental subduction was performed, which confirmed that the continental crust can be deeply subducted and showed that slab break-off, delamination and tectonic underplating are fundamental events with drastic consequences on the subsequent evolution of the convergent system.

TL;DR: In this paper, the authors presented new scaling factors for in situ produced cosmogenic nuclides, which incorporate the influence of the non-dipole contributions to the geomagnetic field on the cosmic ray flux.

TL;DR: In this article, Fourier transform infrared spectroscopy on doubly polished and clear crystals was used to investigate the partitioning of water between mantle phases, and the results suggest that most of the water in the Earth's mantle is partitioned in the transition zone.

TL;DR: In this paper, the Yarlung-Zangbo suture zone in southern Tibet has been extensively studied and extensive field investigations along the Suture zone reveal the presence of now fragmented remnants of a south-facing intra-oceanic subduction system.

TL;DR: In this paper, the main flow of the Kuroshio Current was inferred to re-enter the Okinawa Trough at ∼7.3 calendar (cal.) kyr BP, leading to abrupt changes in sedimentation rate, remarkably increased abundance of Pulleniatina obliquiloculata, increased sea surface temperature (SST) and depth of thermocline (DOT).

TL;DR: In this paper, the authors profile 87Sr/86Sr and δ13C, δ18O, Sr/Ca, Mg/Ca and Na/Ca in belemnites through Pliensbachian and Toarcian strata on the Yorkshire coast, UK.

TL;DR: In this article, a coupled U-Th-Pb isotopic and EMP chemical study was carried out in situ on monazite (micro-inclusions within garnet as well as matrix grains) from rocks recovered from two chronologically well-constrained areas of the Himalayan orogen.

TL;DR: In this article, the authors adapted the conventional Archie's law to produce a simple modified version that can be used with two conducting phases of any conductivity and any volume fraction, while retaining the ability to model variable connectivities within those phases that result from variations in their distribution.

TL;DR: In this paper, the authors determined the δ18O values of water from small tributaries along the Seti River and Kali Gandaki in the Nepal Himalaya and found that δ 18Omw values decrease with increasing altitude for both transects.

TL;DR: In this article, molecular biomarkers (C37 alkenones, n-nonacosane and n-hexacosanol) and TOC are used together with benthic δ18O and δ13C data to document the hydrographic response of the western Mediterranean Sea to rapid climatic variability.

TL;DR: In this article, the authors define three geochemical and structural domains of the Oman ophiolite: the main harzburgitic mantle section, the diapir areas, and the dunite transition zone.

TL;DR: In this article, a single section of abyssal peridotite from the Kane Transform area in the Atlantic Ocean was examined for 190Pt−186Os and 187Re−187Os systematics.

TL;DR: In this article, a series of decompression experiments using crystal-free, rhyolite melt were conducted to examine the development of large supersaturations due to delayed, homogenous (spontaneous) bubble nucleation.

TL;DR: In this article, the San Andreas Fault and the Eastern California Shear Zone (ECSZ) were observed to have a Moho upwarp, indicating that the mountain ranges were lifted en masse by crustal buckling under horizontal compression.

TL;DR: In this article, the authors examined the observation evidence for sea-level change along the French Mediterranean coast and compared with glacio-hydro-isostatic models to predict the spatial and temporal patterns of change for about the past 30,000 14C years.

TL;DR: In this article, the authors show that amphiboles are strongly dependent on the structure and composition of both amphibole and melt and that amphibole oxy-component is explained by the ordering of Nb and Ta at the M1 site, contributing with the fraction of Ti at M1 to locally balance the O3O2−↔O3(OH)− substitution.

TL;DR: In this article, the major and trace element and radiogenic isotope ratios (Sr, Nd and Pb) are presented for a suite of Neogene to Recent basalts (MgO>4 wt%) from the axial regions of the Kenya Rift.

TL;DR: In this paper, the authors present an interpretation of magnetic data from these regions to show that their OCT zones are underlain by crustal material formed by slow seafloor spreading (6.2^7.4 km/s) at shallow depths (1.2 km).

TL;DR: In this article, a mean age of 65.4±0.7 Ma for five flows near the base of the section (Jahwar and Igatpuri formations) and 65.2± 0.4 Ma for a dyke crosscutting the Poladpur formation, below the topmost Mahabaleshwar formation.

TL;DR: In this article, the authors present a map of the depth to the base of the upper crust and the total crustal thickness across Iceland constrained by seismic refraction results, receiver function analysis and gravity modelling.

TL;DR: In this paper, high precision U-Pb perovskite ages for kimberlite and other CO2-rich ultrabasic rocks, primarily from five fields or clusters in eastern North America (Rankin Inlet, Attawapiskat, Kirkland Lake, Timiskaming and Finger Lakes), indicate that at least five periods of Mesozoic kimblerlite magmatism can be distinguished.

TL;DR: In this article, the dominant rocks are basalts with geochemical characteristics distinct from those of mid-ocean ridge basalts and the presence of wood fragments, charcoal, pollen, spores and seeds in the shallow water sediments overlying the igneous basement show that the growth rate of the plateau was sufficient to form subaerial landmasses.

TL;DR: A series of fO2-buffered piston cylinder experiments were performed on three basaltic model compositions in the presence of a H2O-CO2 mixed fluid, at pressures from 1.0 to 2.0 GPa and temperatures from 665 to 730°C as discussed by the authors.

TL;DR: In this paper, a mineralogical study of the three nakhlite (martian) meteorites has revealed that they contain evaporite mineral assemblages and minor goethite is also present in the three meteorites.

TL;DR: This article presented a refined timescale for the entire sequence of Quaternary Chinese loess, which relies upon the correlation of detailed monsoon records to the astronomical solution of Laskar (1990) and the oceanic ODP677 δ18O record of Shackleton et al.

TL;DR: Pore fluid and sediment Li concentrations and isotopic ratios provide important insights on the hydrology, sediment contribution to the arc volcanoes and fluid-sediment reactions at the dominantly nonaccretionary Costa Rica subduction zone.