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Showing 1 to 13 of 13 for “"Mode of occurrence"”.
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Geology and Geochemistry of Muyexe Magnesite Deposit, Giyani Greenstone Belt, Limpopo Province, South Africa
… is available about the geology and geochemistry of the deposit. This has resulted in a gap of information about the nature and character of magnesite, namely; its geology, mineralogy, geochemistry and mode of occurrence. Consequently, there is a need for further investigation of the magnesite …
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ΜΕΤΑΛΛΟΓΕΝΕΣΗ ΣΥΜΠΑΓΩΝ ΘΕΙΟΥΧΩΝ ΜΕΤΑΛΛΕΥΜΑΤΩΝ ΚΑΙ ΠΕΤΡΟΛΟΓΙΑ ΤΗΣ ΕΞΩΤΕΡΙΚΗΣ ΜΕΤΑΜΟΡΦΙΚΗΣ ΤΕΚΤΟΝΙΚΗΣ ΖΩΝΗΣ ΤΩΝ ΕΛΛΗΝΙΔΩΝ (Ν.Α. ΠΕΛΟΠΟΝΝΗΣΟΣ)
CONSIDERATION OF THE GEOLOGICAL, MINERALOGICAL, GEOCHEMICAL AND STRATIGRAPHIC CHARACTERISTICS OF THE STUDIED SEGMENT OF THE EXTERNAL METAMORPHIC BELT OF THEHELLENIDES IN SE PELOPONNESUS, LEAD TO THE FOLLOWING CONCLUSIONS: 1. THE ROCKS OF THE "TYROS BEDS" HAVE SUFFERED A VERY LOW GRADE METAMORPHISM. …
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Petrogenesis and geochemistry of kyanite-bearing pegmatites in the Buncombe Pegmatite District, North Carolina
Kyanite is generally considered to be a product of metamorphism. This study investigates a set of kyanite-bearing pegmatites that represent a case in which kyanite crystallized directly from melt. The pegmatites intrude spinel orthopyroxene hornblendite in the Buncombe Pegmatite District in the …
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Classification of surficial materials
… system has been designed to fit the needs of a geologist in mapping and classifying surficial materials. The system developed in this study is intended primarily for analysis of surficial materials where time-stratigraphic markers are not applicable or recognized. Primary classification is …
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Crescent Hill Chert: A Geological and Cultural Study of a Raw Material Procurement Area in Yellowstone National Park, Wyoming
… Archaeological Project (MYAP) conducted survey of the Crescent Hill chert outcrop (site 48YE729) in the northern portion of Yellowstone National Park. Occurring in a variety of colors and qualities, the chert precipitated within the Eocene-era Crescent Hill basalt formation. The procurement area …
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Crescent Hill Chert: A Geological and Cultural Study of a Raw Material Procurement Area in Yellowstone National Park, Wyoming
… Archaeological Project (MYAP) conducted survey of the Crescent Hill chert outcrop (site 48YE729) in the northern portion of Yellowstone National Park. Occurring in a variety of colors and qualities, the chert precipitated within the Eocene-era Crescent Hill basalt formation. The procurement area …
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Distribution of gold in soils and stream sediments and the use of cyanidation in exploration geochemistry
… problem in gold exploration. The recent use of cyanide to extract gold from geochemical samples has allowed samples up to 1 kg or larger to be processed. Results of cyanide analyses cannot be interpreted, however, without first understanding the mode of occurrence of gold in the sample media. …
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The gold absorption properties of shaly material from Beatrix Gold Mine
… Beatrix Gold Mine has been found to be capable of adsorbing gold from cyanide solutions. Black shale bands occur in the reef zone at Beatrix Mine, but because of the mode of occurrence of the shale bands selective mining cannot be practised and ore delivered to the plant is contaminated by …
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The possibility of an impact-related origin of quasi-conglomerate pseudotachylytes on Barra, Outer Hebrides, Scotland, an integrated study
This study investigates the origin of the quasi-conglomerate pseudotachylytes in the Lewisian Gneiss on Barra, Outer Hebrides, Scotland. These exceptionally large pseudotachylytes have either been ascribed to the Outer Hebrides Fault Zone (OHFZ) or considered to be at a distance from the OHFZ. The …
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The geologic and tectonic evolution of the Pan-African/Mozambique Belt in East Africa
The presence of ophiolite complexes in NE and E Africa has been documented using Landsat, field and geochemical studies. This has led to the recognition of five ophiolite belts. These ophiolite belts represent sutures marking the position of island arcs and could be traced to Saudi Arabia on a …
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Geochemical Evolution at White Island, New Zealand
… volcano that is located near the southern end of the Tonga-Kermadec Volcanic Arc at the convergent plate boundary where the Pacific Plate is being subducted beneath the Indian-Australian Plate. The plate tectonic setting, volcanic features and the petrology of White Island are thought to be …
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The genesis of the blue amphibole asbestos of the Union of South Africa.
… occurs as interbedded seams in banded ironstones of the Lower Griquatown stage of the Transvaal System in the Northern Cape Province, is the finely fibrous form of the soda-amphibole riebeckite. Despite the widespread occurrence of the Precambrian type of banded ironstones, crocidolite is a …