Showing papers in "Journal of Geochemical Exploration in 2000"

TL;DR: The gadopentetic acid (Gd-DTPA) was used as a contrast medium in magnetic resonance imaging to measure the stability of surface water and groundwaters of industrialised and highly populated areas as mentioned in this paper.

TL;DR: In this paper, the authors assess the types of rocks and the geochemical processes responsible for the chromium presence in the water in the Leon Guanajuato Valley, Central Mexico.

TL;DR: The use of Pb isotopes, measured by inductively coupled plasma mass spectrometry (ICP-MS), in combination with the determination of heavy metal concentrations has identified the mining and smelting activities that took place early in the Harz Mountains as the source of contamination as discussed by the authors.

TL;DR: Pironon et al. as discussed by the authors proposed a new modeling tool, called Petroleum Inclusion Thermodynamic (PIT), based on applied thermodynamics of natural oils, for interpreting volumetric (Fv) and micro-thermometric (Th) measurements obtained on hydrocarbon fluid inclusions.

TL;DR: In this article, a Confocal Laser Scanning Microscope was used along with PVT modeling software to estimate the composition, PT phase envelope and isochore of single petroleum inclusions in the North Sea's Judy field.

TL;DR: Fenton et al. as discussed by the authors observed that fluid seepage occurs preferentially in the proximity to faults and faulted anticlines, and to slump scarps, with faults acting as preferred conduits for fluid flow across units of low matrix permeability.

TL;DR: In this paper, the possibility of sequestering CO 2 in regional-scale aquifers in sedimentary basins, including residence time in possible aquifer storage sites and migration rates away from such sites, was tested.

TL;DR: In this article, the authors explore and provide bounds for the various parameters involved in mineralisation and even determine parameters critical for predictive exploration through quantitative modelling of specific regions with detailed structure and simple "what-if" scenarios.

TL;DR: In this article, a modified alteration index (AI Mark 3) was proposed for defining the most favourable stratigraphic units for stratiform Zn-Pb-Ag mineralisation within carbonate-bearing sedimentary basins.

TL;DR: Fluorite-bearing Cu-Au, Ag-Pb-Zn and Ag-Ag-Ag deposits in southwestern New Mexico have been studied in this paper, showing that fluorite in most of the veins formed from low salinity (0.7 eq. wt.% NaCl) fluids at temperatures between 100° and 220°C.

TL;DR: In this paper, the authors show that the strongly non-ideal behavior of alkali chlorides causes unmixing of the volatile phase to form a H2O-rich vapor and a hydrosaline phase with important implications for the maximum concentration of Cl in magmas.

TL;DR: In this article, the authors studied the effect of tectonic stress transition on the capacity of hydraulic extension fracturing and showed that the maximum overpressure is always higher in compressional than in extensional regimes.

TL;DR: In this paper, a detailed overview of the Miocene and Quaternary placers in the northwest (NW) of Spain has been presented, including the Las Medulas mine, which was the largest earth movement mining operation in Iberia up until the 20th century.

TL;DR: In this article, the acid leachability of major elements from common silicate and oxide minerals has been determined experimentally and the results revealed appreciable differences in the leachable properties of different elements from different minerals.

TL;DR: In this paper, the authors show that the fibrous growths are believed to reflect precipitation in over-pressured systems where fracture-walls are held apart by fluid pressure.

TL;DR: In this paper, it is proposed that fluid is pumped down into dry basement during faulting and causes a ductile response with recrystallisation that leads to them being sealed in and compressed.

TL;DR: In this article, a precise age ( 62.6±0.7 Ma ) has been obtained from an isochron that combines ore-stage calcite and galena from the Avecilla Mine.

TL;DR: The provenance of saline inputs to the Salar de Atacama has been studied by means of the isotopic composition of sulphates dispersed in drilling core samples and the analysis of the water of surface inflows as mentioned in this paper.

TL;DR: A study of five separate alluvial localities yielded a microchemical signature consistent with the mineralogy of the adjacent host mineralisation as discussed by the authors, which has permitted informed speculation on the styles and complexity of gold mineralisation contributing to the gold grains where the style of source mineralisation is unknown.

TL;DR: In this article, mineralogical, fluid inclusion and geochemical studies were made on two intra-granitic gold deposits (Grovelas and Pene- dono), together with a deposit linked to sub-vertical structures in silicified metasediments at Tres-Minas, and several intra- metamorphic occurrences at Vila Pouca de Aguiar.

TL;DR: In this article, the authors discuss the petrographical, mineralogical and geochemical characteristics of the intrusive rocks located along the Rio Narcea Gold Belt, and the timing of formation of the El Valle-Boinas deposit.

TL;DR: In this article, the authors used FT-IR microspectroscopy on synthetic and natural inclusions to show that the intensity of the liquid water infrared band decreases with temperature increase due to solubility of water in the oil phase.

TL;DR: In this paper, the authors used spatial variations of solute chemistry in basinal brines to determine the origin of formation waters and to infer regional patterns of fluid flow and dominant diagenetic processes active in the Williston Basin, Canada-U.S.A.

TL;DR: The Upper Jurassic sub-arkosic turbidite sandstones of the Magnus oil field, UK North Sea, are dominated by quartz, ankerite and kaolinite cements that all grew immediately prior to and during, the early stages of oil-filling.

TL;DR: The El Valle-Boinas copper-gold mine as discussed by the authors is located in the southern part of the Rio Narcea Gold Belt 65 km west of Oviedo (NW Spain), within the Cantabrian Zone (Iberian Hercynian Massif).

TL;DR: In this paper, the spectral reflectance characteristics of forest vegetation growing on the altered rocks were analyzed and the authors concluded that the dominant chestnut oak canopy and the lack of other species that are usually present here on the unaltered rocks, result in lower apparent canopy density at the altered sites, which is expressed in the AVIRIS data by lower O-H absorption intensity.

TL;DR: In the presentation, several migration-modelling techniques are reviewed and each one is related to the key criteria of dynamics and scaling according to their current development stage and potential.

TL;DR: An exotic trend of positively correlated Cr and Ca occurs in garnet from xenoliths in the Jericho kimberlite, northern Canada and is attributed to equilibration of garnet with spinel.

TL;DR: In this paper, the isotope compositions of formation-waters from the Williston Basin are reported from produced waters and drill stem tests for a vertical stratigraphic section near Midale, Saskatchewan.

TL;DR: Fuzzy c-means clustering of multivariate stream-sediment geochemistry in a geologically complex area of the Eastern Alps (Austria) allows to separate four dominant associations of lithologies.