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Showing 1 to 20 of 21 for “"Dolerite"”.
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The petrology of the Elephant's Head dyke and New Amalfi sheet
… study of two allied intrusions of Karroo dolerite, situated in the Matatiele district of East Griqualand (South Africa). The one intrusion is a multiple dike of exceptional form and great length. It served as the main feeder of the second intrusion, a thick transgressive sheet. Two magmas …
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Microbial-Induced Calcite Precipitation in soils: use of alternative raw materials and analysis of environmental implications
… and potentially reduce treatment costs. Dolerite fines by-product of the quarrying sector and cow urine derived from the farming sector were investigated as sources of calcium and nutrients to induce urea hydrolysis, respectively.<br/><br/>Suitability of the proposed products was …
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Sediment-hosted Zn-Pb-Ag (+ Cu) deposits in the Mount Isa region: An epigenetic approach to mineralisation
… Tl, Co and Bi relative to the parent minerals. Dolerite dykes exist within the Hilton and George Fisher Zn-Pb-Ag deposits. Apatite U-Pb geochronology constrains the emplacement age of the dolerite dykes to ca. 1620 Ma. Monazite U-Pb and calcite Lu-Hf geochronology constrains widespread …
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Apophyllite weathering and the aqueous geochemistry of a Karoo breccia pipe
… a major secondary phase occupying fractures in a dolerite breccia pipe on the farm Kopoasfontein, outside Calvinia in the western Karoo, South Africa. Groundwater abstracted from this breccia is uncharacteristically alkaline (pH 10) and high in fluoride (11 mg/L) for a natural water and the link …
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Petrogenesis of the False Bay dyke swarm, Cape Peninsula, South Africa
… is the southern-most set of Early Cretaceous dolerite dyke intrusions along the western margin of southern Africa associated with rifting of Gondwana and opening of the South Atlantic Ocean. Previous work highlighted the evolution of a single magma type from olivine-tholeiite basalt to …
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The Dynamics of the Late Neogene Antarctic Ice Sheets in the Central Ross Sea using a Multianalytical Approach
… values are relatively un radiogenic, and dolerite clasts are present signaling a shift to East Antarctic derived ice. Above Ross Sea Unconformity 3, early to mid Pliocene samples show a shift back to West Antarctic provenance with abundant Cretaceous zircons and more radiogenic neodymium …
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Palaeomagnetic studies on some South African rocks
… samples. A palaeomagnetic study of the Karroo dolerites was undertaken in an attempt to (i) determine 1 the position of the geomagnetic pole at the time of the intrusions, and (ii) possibly assess the importance of the remagnetization of Karroo sediments by the thermal effects of the younger …
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The geology of the area east of Pofadder with emphasis on shearing associated with the Pofadder lineament, North West Cape
… suite, diorite, pegmatite and vein quartz. Dolerite is post-tectonic, most likely of Karoo age and occurs as sills and remnant hillocks. Non-diamondiferous kirnberlite pipes occur in the west and their emplacement appears to have been structurally controlled, being situated along the Nouzees …
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Geology and characterization of coal at the Mushithe Coal Occurrence, Soutpansberg Coalfield, Limpopo Province, South Africa
… The host rocks including coal were intruded by dolerite dykes and this resulted in the devolatilization of coal. The current study concluded that the Mushithe coal was formed in a wet swampy environment. This has been confirmed based on tissue preservation index (1.69) and gelification index …
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The influence of various South African aggregates on the creep of concrete
… Quartzitic Reef Quartzite, Hornfels, Granite and Dolerite.
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The geochemistry of the Karoo igneous volcanic and intrusive rocks of Botswana
The Mesozoic basalts and dolerites of Botswana underlie an estimated area of 150 000km2 and form part of the Karoo Igneous Province of southern Africa. The distribution of Karoo basalts in Botswana is limited essentially to three main sub-basins, the Central Kalahari Subbasin, northern Botswana and …
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Hydrogeological characterisation and water supply potential of Lebalelo South, Limpopo Province of South Africa
… locate the position of magnetic bodies such as dolerite dykes and different lithologies with different magnetic properties. The electromagnetic survey however, was used to determine zones of high permeability associated with the intrusive bodies as well as high permeability zones in fault …
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Granite By-Products for inverted pavement technique
… granite by-products were analyzed comparing to Dolerite, used in South Africa in the Inverted Pavement Technique.
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Tertiary and carboniferous magmatism around Lundy Island and the outer Bristol Channel - a geophysical and geochemical perspective
… anomalies. The Lundy Dyke Swarm comprises basalt/dolerite and trachyte to rhyolite intrusions within host Tertiary granite (58.7 ± 1.6 Ma) and Devonian sediments. Outcrops of dykes are confined to coastal exposures on Lundy as they are veneered by peat over most of the island. Dykes present paired …
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Antarctic glacial chronology : new constraints from surface exposure dating
… and determination of initial 3He/4He in Ferrar Dolerite and Beacon Sandstone, substantially reduce uncertainties in Antarctic exposure ages. 3He production rates of 129 ± 4 atoms/g/yr (olivine) and 124 ± 4 atoms/g/yr (clinopyroxene) at sea level, high latitude, are determined from an …
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Diagenetic, thermal and provenance histories of the Permian lower Ecca Group based on two newly drilled boreholes in the western and eastern main Karoo Basin, South Africa
… were also altered by contact metamorphism due to dolerite intrusions in the Early Jurassic. Major mineralogical differences between the boreholes include: 1) Fesilicate (greenalite); carbonates (rhodochrosite and dolomite) and Mn nodules (birnessite) being found only in BH KZF-1; and 2) …
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40Ar/39Ar, AFT and (U-Th)/He thermochronologic implications for the low-temperature geological evolution in SE Sweden
… (TIB). Younger, 1.45 Ga granites and c. 0.95 Ga dolerite dykes are also present in the area. 40Ar-39Ar hornblende ages indicate initial rapid cooling down to c. 500 °C after the emplacement of TIB rocks. Subsequent cooling through c. 300 °C initially occurred at 1.6 Ga (40Ar-39Ar biotite ages). A …
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Hut lung : a study of domestically acquired pneumoconiosis in rural women
… respectively) when non-quartz containing dolerite was used. Calculated cumulative equivalent time-weighted average respirable dust concentrations were shown to be similar to those found in an average South African gold mine while calculated equivalent respirable quartz concentrations were …
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Patterns of plant species richness and diversity across two habitat types in the Upper Karoo, South Africa
… in two habitat types (i.e. plains and rocky dolerite hillslopes), and along a longitudinal environmental gradient. A pairwise floristic survey approach was implemented, using modified Whittaker plots in each habitat type at 30 sites within the shale gas exploration area in the Upper Karoo …
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The isotopic evolution of the British lithosphere
… are the same as the calculated sources of the dolerite dyke suites and are probably equivalent to these, at depth, sources.<br></br><br></br>Two suites of metabasaltic rocks occur in the Mona Complex (Anglesey), the Gwna Group ((Ce/Yb)<sub>N</sub> = 0.6 - 2.1) and New Harbour Group …
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