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Showing 1 to 12 of 12 for “"Geochemical compositions"”.
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Origin of geochemical heterogeneity in the mantle : constraints from volcanism associated with Hawaiian and Kerguelen mantle plumes
… plumes provide important information of mantle compositions and the processes that created the geochemical heterogeneity within the mantle. Kerguelen and Hawaii are two long-lived mantle plumes and lavas associated with them have very different geochemical characteristics. In this thesis I …
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Multi-scale evaluation of groundwater flow and metal sourcing to streams in the Bonita Peak mining district
Hydrologic and geochemical processes associated with acid mine drainage that result in the weathering of sulfide minerals and fluxes of metals to streams vary through space and time. Remediation of former mine sites relies on appropriate recognition and quantification of these changing processes. …
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On the spatial modelling of mixed and constrained geospatial data
… permeability, seismic velocity, mineral and geochemical compositions or pollutant concentration). These multivariate geospatial data normally have complex statistical and spatial relationships which should be honoured in the predicted models. Continuous variables in the form of percentages, …
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Effects of Glaciation on Volcanism in Iceland
… formed during the Termination~II have different geochemical compositions from that formed during the Termination~I. Lastly, predictions for the future of the Icelandic volcanic eruption rates are made based on given estimated deglaciation rates of the current Icelandic glaciers.
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Continental Magmatism and Dynamic Topography
… of this study is to investigate the link between geochemical compositions of intracontinental magmatism and geophysical, geomorphological and geodetic observations of dynamic uplift. Three volcanic regions are considered in detail: western North America, northeast Brazil and Madagascar. The …
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Mineralogy and geochemistry of geophagic materials from Mashau Village in Limpopo Province, South Africa
… Village, however, their mineral content and geochemical compositions had not been determined. Moreover, though the consumption of geophagic materials is very common in the village, the associated health implications had not been addressed. Thus, the main aim of the research was to …
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Regional dolomitization of Early Ordovician, Upper Knox Group, Appalachians
… falls. "Early" dolomite was metastable and its geochemical composition was modified during initial stabilization by marine brines during progradation of each cycle, and by mixed fresh/marine waters of the Knox aquifer associated with unconformity development. Much "early" dolomite however, …
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Expressions of Mantle Dynamics in Landscapes and Sedimentary Basins
… temperature were obtained by modelling geochemical compositions of mafic volcanic rocks. Results suggest that elevated topography is supported by anomalously hot asthenosphere and by a thinned lithospheric plate. Regional uplift and magmatism appear to have propagated from east to west …
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Variability, origin and physical characteristics of dust aerosol in Iceland
… dust reveal major differences in mineralogy, geochemical compositions, shapes, sizes and colour, compared to the crustal mineral dust. Icelandic dust is of volcanic origin, dark in colour with sharp-tipped shards and large bubbles. About 80 % of the particulate matter is volcanic glass rich in …
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Characterisation of ocean island basalt sources : St. Helena
… framework is developed to illustrate temporal geochemical variations over 2 Ma of subaerial activity. This is accomplished in conjunction with a detailed field study of the SHRS by Baker(1968) which is shown to be largely accurate. It is demonstrated that ascending magma batches are …
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Lakes and Groundwater of the Rieti Basin, Central Italy: Hydrochemistry, Paleolimnology, and Seismologic Influences
… were proposed with distinct sedimentological and geochemical compositions. The common feature of seismites attributed to the 1298, 1349, and 1703 earthquakes was a homogenite formed either by a rapid influx of groundwater at the sediment-water interface or strong ground shaking causing sediment …
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Mineralogy and geochemistry of kaolins in oxidic soils developed from different parent rocks in Limpopo Province, South Africa
… with predominantly kaolinitic assemblage. The geochemical and mineralogical composition of soil kaolin has significant implications on soil fertility, geochemical exploration and engineering properties. Despite the dominance of kaolin in these soils, little is known of their properties in the …