Showing papers in "Journal of Geochemical Exploration in 1995"

TL;DR: In this paper, a geochemical model was used to predict copper concentrations in a river system affected by acid mine drainage and tailings inputs, showed good agreement between measured and predicted values.

TL;DR: In this paper, a new approach to deciphering the origin of diamond is presented, involving the collation of all primary genetic information collected from large single crystals, and it is concluded that diamond monocrystals of both eclogitic and peridotitic parageneses took place during early igneous events within the mantle.

TL;DR: In this paper, the position of the local paleogeotherm can be derived from garnet concentrates, and the depth of origin of each garnet grain is determined by referral of its T n i to the derived geotherm.

TL;DR: In this paper, the major element compositions of the mantle macrocryst minerals recovered during stream sediment or soil sampling are investigated to provide a qualitative or at best semi-quantitative estimate of diamond potential.

TL;DR: In this paper, the possibility of restoring a vegetation on a bare, industrial dumping ground, strongly contaminated by several nonferrous metals was studied, and the potential beneficial effect of this restoration on metal leaching was estimated.

TL;DR: Based on a three dimensional topological diagram of Pb isotopes, six geochemical provinces can be recognized in China, namely southern China, Yangtze, northern China, northern Xinjiang, Jiamusi and Tibet.

TL;DR: In this article, the influence of acid sulfate soils on stream water geochemistry was studied in thirteen catchment basins in western Finland, and the median concentrations of several elements, including Al, Co, Li, Mn and Ni, are much higher than those in headwater streams of Finland and in Fennoscandian rivers.

TL;DR: In this article, the As concentrations in the water show seasonal differences, with an average concentration of 62 μg/L during the summer, and 22 μg /L in winter, and the As profile of interstitial waters are characterized by subsurface maxima with concentrations four to six times greater than the lake waters.

TL;DR: In this paper, the Tarnowskie Gory region, the most contaminated area of Upper Silesia, is contaminated with Cd, Pb and Zn, and the geometric means of concentrations of these elements in the soils are as follows ( in mg/kg, dry wt.): Cd 3.2; Pb 102.3; Zn 270.2.

TL;DR: In this article, the area selection in modern diamond exploration should be based on the prediction of regions under which diamonds may have formed, selection of those areas under which the diamonds might have survived until entrained by younger kimberlites or lamproites, and identification of mantle-root-friendly structures which served as pathways for diamondiferous kimbers or lamps in the appropriate areas.

TL;DR: Kimberlites occur on every continent and the total number of known primary host rock occurrences is generally accepted as 5000, of which 500 are diamondiferous, 50 have been or are being mined and 15 are large active mines.

TL;DR: In this paper, the Glengonnar Water has experienced severe environmental degradation resulting from historic lead mining operations and the legacy of the mining era remains in the form of river and floodplain sediments grossly polluted with metals.

TL;DR: A comparison of the character of epithermal gold deposits in the southwest Pacific with those in other regions (e.g., the northeastern Pacific margin) suggests that they are in most respects similar with, however, three differences: (i) through much of the region (especially the Philippines and Indonesia) low-sulfidation style deposits commonly show characteristics suggestive of formation at deeper levels than is typical elsewhere; (ii) high-Sulfidation deposits appear to be more common than along the northeast Pacific margin; (iii) many of the largest deposits show atypical features

TL;DR: In this paper, the authors review the regional and local structural controls on the emplacement, in the crustal environment, of kimberlites and lamproites after the generation of the magmas at depth.

TL;DR: In this paper, the biogeochemical effects of abandoned gold mine tailings on the aquatic ecosystem of JCL in the Fraser River drainage basin were assessed, and the concentrations of major and trace elements in different environmental compartments (e.g., water, suspended and bottom sediments, sediment porewater, and biota) of Jack of Clubs Lake (JCL), Wells, British Columbia (Canada).

TL;DR: In this article, ground water, alluvium, and bedrock samples were collected from drill holes near the Chimney Creek, Preble, Summer Camp, and Rabbit Creek disseminated gold deposits in northern Nevada to determine if Au and ore-related metals, such as As, Sb, and W, are being hydromorphically mobilized from buried mineralized rock, and, if they are, to determine whether the metal-enriched ground water is reacting with the alluvial material to produce a geochemical anomaly within the overburden.

TL;DR: In this article, a sampling program is designed to obtain a reliable estimate of the average grade of the diamond deposit, expressed as carats per tonne or cubic metre, and of the value of the diamonds, traditionally expressed as US dollars per carat.

TL;DR: In this paper, a critical analysis of the environmental responses to the releases of radionuclides and metals from the uranium mining and milling facilities of Pocos de Caldas into surface waters is presented.

TL;DR: The potential use of selected willow clones for reclamation and restoration of contaminated soils is discussed, and significant differences were found in root length increase, number of lateral roots produced and patterns of metal uptake between species, hybrids and clones.

TL;DR: The diamond bearing volcano, whether kimberlite or lamproite, is of variable size and structure (and hence variable diamond reserves) largely dependent on groundwater availability at the time of eruption.

TL;DR: In this article, the element concentrations in the fine and coarse fractions of 618 till samples from southern Finland were compared using four data sets: 1. analyses based on total dissolution of the fine till fraction, as published in the Geochemical Atlas of Finland; 2. aqua regia soluble concentrations of the coarse till fraction; 3. analytical results from the fine fraction of till can be used to estimate the natural distribution of trace elements in the coarser till fraction.

TL;DR: A series of 12 gravity cores and 150 surface grab samples were collected in Lake Coeur d'Alene, Idaho to determine trace element concentrations, partitioning and surface and subsurface distribution patterns in the bed sediments of the lake as discussed by the authors.

TL;DR: The most cost effective geophysical reconnaissance technique has been airborne magnetics as mentioned in this paper, which can accurately detect and map kimberlite and lamproite pipes, whether diatreme or crater fades, and may discriminate separate intrusive phases within an intrusion.

TL;DR: In this paper, an energy dispersive X-ray micro-analyses of the remains of individual organisms in plankton samples, together with more conventional analyses of sediments and water, were performed for the purpose of investigating the accumulation of heavy metals by plankton in three Canadian Shield lakes polluted with Cu, Zn, Cd, Pb, As, and SO2−4 from a base metal mine and smelter.

TL;DR: In this article, partial least squares regression analysis (PLSAR) is used to distinguish anthropogenic anomalies from natural contents. But the results show that the anthropogenic impact is also carried by these new samples.

TL;DR: The most successful and broadly applied method in diamond exploration is heavy mineral sampling which, through recovery of indicator minerals and diamonds, has led to the discovery of many mines around the world as mentioned in this paper.

TL;DR: In this paper, mass spectrometers were used to determine the δ37C1 values of selected minerals from different localities and origins, including secondary sedimentary and volcanic minerals.

TL;DR: Stream sediment data of Sierra de San Carlos, Tamaulipas, Mexico are used to demonstrate the possibilities of limited fuzzy clustering in geochemical exploration and mapping.