Petrology of Olkiluoto
... various veined gneisses and diatexitic gneisses, together with various mica gneisses and quartz gneisses. One typical feature of this series is the occurrence of strongly pinitized cordierite and sometimes also a small proportion of sillimanite. The T series is an transition series, the end members ...
... various veined gneisses and diatexitic gneisses, together with various mica gneisses and quartz gneisses. One typical feature of this series is the occurrence of strongly pinitized cordierite and sometimes also a small proportion of sillimanite. The T series is an transition series, the end members ...
List by Deposit Group - Ministry of Energy and Mines and
... usually required, but some bogs may cover several thousands of hectares. ECONOMIC LIMITATIONS: In North America, a thickness of 2 metres and an area of 50 hectares is generally considered the minimum for economic viability. The site must have good potential to build an enhanced drainage system, be c ...
... usually required, but some bogs may cover several thousands of hectares. ECONOMIC LIMITATIONS: In North America, a thickness of 2 metres and an area of 50 hectares is generally considered the minimum for economic viability. The site must have good potential to build an enhanced drainage system, be c ...
eclogites in quartzo-feldspathic gneisses of nordfjord, west norway
... are Iikely to be original crustal rocks. They occur as disrupted layers or boudins in paragneiss in harmony with a formation from dry basic igneous and sedimentary rocks endosed in a thick geosynclinal pile of supracrustals which were rapidly buckled down to great depths and metamorphosed there. Ele ...
... are Iikely to be original crustal rocks. They occur as disrupted layers or boudins in paragneiss in harmony with a formation from dry basic igneous and sedimentary rocks endosed in a thick geosynclinal pile of supracrustals which were rapidly buckled down to great depths and metamorphosed there. Ele ...
Sphalerite composition in relation to deposition and metamorphism
... sphalerite is seldom a major constituent. In sulphidic Fe content of the host sphalerite around these bands, the sphalerite content occasionally increases orientated inclusions suggests that this pyrrhotine to > 50 ~o over intervals of 1-20 cm. Sphalerite formed by exsolution from the sphalerite. Ch ...
... sphalerite is seldom a major constituent. In sulphidic Fe content of the host sphalerite around these bands, the sphalerite content occasionally increases orientated inclusions suggests that this pyrrhotine to > 50 ~o over intervals of 1-20 cm. Sphalerite formed by exsolution from the sphalerite. Ch ...
Rare Earth Elements - Technology Metals Research
... 4 Igneous: rocks which have a crystalline texture and appear to have consolidated from molten rock. 5 Sedimentary: a rock formed from sediment which may of organic or inorganic in origin, 6 Metamorphic: Metamorphic: rocks changed by temperature and pressure within the Earth’s crust 7 Hydrothermal – ...
... 4 Igneous: rocks which have a crystalline texture and appear to have consolidated from molten rock. 5 Sedimentary: a rock formed from sediment which may of organic or inorganic in origin, 6 Metamorphic: Metamorphic: rocks changed by temperature and pressure within the Earth’s crust 7 Hydrothermal – ...
1. INTRODUCTION The Sudbury Structure is located in Canada
... The mineralizations mapped on surface have been evaluated to be potential for low-sulphide Cu-Ni-PGE-type mineralization, popular exploration target of recent interests. The most detailed study of Vermilion mineralization was aimed to explain the multistage history of formation of such deposit types ...
... The mineralizations mapped on surface have been evaluated to be potential for low-sulphide Cu-Ni-PGE-type mineralization, popular exploration target of recent interests. The most detailed study of Vermilion mineralization was aimed to explain the multistage history of formation of such deposit types ...
Bulletin 80: Precambrian Geology of La Madera Quadrangle, Rio
... rocks. Granitic pegmatite dikes and sills intrude the metamorphic complex. The first regional metamorphism resulted in the formation of quartzite, schist, and gneiss, from an original assemblage of quartz sandstone, shale, basic flow rock, granite or granitized rock, and silicic volcanic rock. First ...
... rocks. Granitic pegmatite dikes and sills intrude the metamorphic complex. The first regional metamorphism resulted in the formation of quartzite, schist, and gneiss, from an original assemblage of quartz sandstone, shale, basic flow rock, granite or granitized rock, and silicic volcanic rock. First ...
ZEOLITES IN FISSURES OF CRYSTALLINE BASEMENT ROCKS
... formation are derived from dissolving primary granite and gneiss minerals. The nature of these minerals depends on the metamorphic history of the host rock. Zeolites in the Aar Massif derived from the dissolution of epidote or calcite and albite that were originally formed during Alpine greenschist ...
... formation are derived from dissolving primary granite and gneiss minerals. The nature of these minerals depends on the metamorphic history of the host rock. Zeolites in the Aar Massif derived from the dissolution of epidote or calcite and albite that were originally formed during Alpine greenschist ...
Origin of myrmekite as it relates to K-, Na-, and Ca
... Ab-An-Or-Q. Because their experimental results have been confirmed for innumerable examples in natural rocks, in the minds of most petrologists, Tuttle and Bowen also placed considerable limitations on the scale of possible subsolidus bulk chemical changes in granites. On that basis, it was logical ...
... Ab-An-Or-Q. Because their experimental results have been confirmed for innumerable examples in natural rocks, in the minds of most petrologists, Tuttle and Bowen also placed considerable limitations on the scale of possible subsolidus bulk chemical changes in granites. On that basis, it was logical ...
full text, PDF
... prepared in order to detailly observe and to describe the superposition manner and the textural features, mineral composition and its variation. Furthermore, 34 trenchs in sepiolite-rich beds vertical to bedding are opened. 170 samples are collected from various lithologic units, from the stratigrap ...
... prepared in order to detailly observe and to describe the superposition manner and the textural features, mineral composition and its variation. Furthermore, 34 trenchs in sepiolite-rich beds vertical to bedding are opened. 170 samples are collected from various lithologic units, from the stratigrap ...
Minerali Bosne i Hercegovine
... original text and only minor modifications have been made in cases where clarity or modern usage required this. The order in which the minerals are described follows the classic crystallochemical approach by Hugo Strunz (1966) and the formulae have also been written following his system. Even the on ...
... original text and only minor modifications have been made in cases where clarity or modern usage required this. The order in which the minerals are described follows the classic crystallochemical approach by Hugo Strunz (1966) and the formulae have also been written following his system. Even the on ...
Gold mineralization and associated alteration zones of the Biely vrch
... The deposit is located in the central zone of the Neogene Javorie stratovolcano, and shares many properties typical for Au-porphyry deposits. Parental intrusion of diorite to andesite porphyry and its andesitic volcanic host rocks are affected by extensive alteration, dominated by intermediate argil ...
... The deposit is located in the central zone of the Neogene Javorie stratovolcano, and shares many properties typical for Au-porphyry deposits. Parental intrusion of diorite to andesite porphyry and its andesitic volcanic host rocks are affected by extensive alteration, dominated by intermediate argil ...
Tourmaline-rich pseudomorphs in sillimanite zone metapelites
... In metamorphic rocks, pseudomorphs and their associated mineral assemblages are especially useful in providing insights into the reaction history experienced by a terrane. Because pseudomorphing generally represents a local bulk compositional change, pseudomorphs preserve evidence of compositional e ...
... In metamorphic rocks, pseudomorphs and their associated mineral assemblages are especially useful in providing insights into the reaction history experienced by a terrane. Because pseudomorphing generally represents a local bulk compositional change, pseudomorphs preserve evidence of compositional e ...
ORIGINAL PAPER
... barytocalcite-structured carbonates (Chang 1971). With decreasing P, these fields shrink, and the calcite structure is adapted by low-Ba (≤ 3 mol.% BaCO3) Sr-bearing compositions near the CaCO3 corner, which are separated from the aragonite-type (Ca,Sr)CO 3 series by a miscibility gap (Fig. 1b). The ...
... barytocalcite-structured carbonates (Chang 1971). With decreasing P, these fields shrink, and the calcite structure is adapted by low-Ba (≤ 3 mol.% BaCO3) Sr-bearing compositions near the CaCO3 corner, which are separated from the aragonite-type (Ca,Sr)CO 3 series by a miscibility gap (Fig. 1b). The ...
Berg Porphyry Copper
... A multistagevein stockwork is superimposed onthe pervasively alteredrocks.Early veins, both with and without alteration envelopes, were deposited from saline fluids at temperatures in excess of 400 degreesCelsius. Later veins were deposited from cooler, less saline fluids and commonly have retrograd ...
... A multistagevein stockwork is superimposed onthe pervasively alteredrocks.Early veins, both with and without alteration envelopes, were deposited from saline fluids at temperatures in excess of 400 degreesCelsius. Later veins were deposited from cooler, less saline fluids and commonly have retrograd ...
Petrotectonics of ultrahigh-pressure crustal and upper
... mineral Fe3+/Fe2+ typically had uncertainties of ±100 °C. Proyer et al. (2004) used the Mössbauer milliprobe to demonstrate that the problem can be even worse, with apparent temperatures as much as 300 °C too high. Unfortunately, only a handful of Fe3+/Fe2+ measurements on UHP eclogites have been ma ...
... mineral Fe3+/Fe2+ typically had uncertainties of ±100 °C. Proyer et al. (2004) used the Mössbauer milliprobe to demonstrate that the problem can be even worse, with apparent temperatures as much as 300 °C too high. Unfortunately, only a handful of Fe3+/Fe2+ measurements on UHP eclogites have been ma ...
Mineral exploration Lewisian supracrustal and basic rocks of the
... characteristics of ‘greenstone belts’ in basement gneiss terrain which host many of the world’s gold deposits. Often these deposits are closely associated with banded iron formations (BIFs) and iron-rich exhalites are present in the Gairloch and Loch Maree belts associated with a mixed volcanosedime ...
... characteristics of ‘greenstone belts’ in basement gneiss terrain which host many of the world’s gold deposits. Often these deposits are closely associated with banded iron formations (BIFs) and iron-rich exhalites are present in the Gairloch and Loch Maree belts associated with a mixed volcanosedime ...
4.1 Sedimentary Rocks The sedimentary rocks of the Silverton
... magnetite and sulphides which are intergrown with the secondary silicates. The sulphides and magnetite increase in abundance with an increase in alteration suggesting some S mobility. Amphibole may replace clinopyroxene, orthopyroxene, magnetite and sulphides. Actinolite needles sometimes penetrate ...
... magnetite and sulphides which are intergrown with the secondary silicates. The sulphides and magnetite increase in abundance with an increase in alteration suggesting some S mobility. Amphibole may replace clinopyroxene, orthopyroxene, magnetite and sulphides. Actinolite needles sometimes penetrate ...
chloritization and associated alteration at the jabiluka
... pelitic sequence that is now composed of quartz + chlorite :t muscovite :t sericite :t graphite schist, which commonly contains chlorite-replaced garnet porphyroblasts, and massive chlorite rock. In places, the schists contain apatite- or tourmaline-rich layers. Unaltered amphibolite-facies schists ...
... pelitic sequence that is now composed of quartz + chlorite :t muscovite :t sericite :t graphite schist, which commonly contains chlorite-replaced garnet porphyroblasts, and massive chlorite rock. In places, the schists contain apatite- or tourmaline-rich layers. Unaltered amphibolite-facies schists ...
13.21 Geochemistry of the Rare-Earth Element, Nb, Ta, Hf, and Zr...
... Intermediate members of the complex ferrocolumbite– manganotantalite series (colloquially known as ‘coltan’) are the major source of Ta, although it is difficult to estimate their exact share of the market because they are typically accompanied by a variety of other Ta ore minerals, the most common ...
... Intermediate members of the complex ferrocolumbite– manganotantalite series (colloquially known as ‘coltan’) are the major source of Ta, although it is difficult to estimate their exact share of the market because they are typically accompanied by a variety of other Ta ore minerals, the most common ...
Petrology, Petrophysics and Fracture Mineralogy of the Drill Core Sample OL-KR8
... (Kärki & Paulamäki 2006). In addition to those, pegmatitic granites and diabases form their own groups which can be identified both macroscopically and chemically. The members the T-series build up a transition series the end members of which are relatively dark and often cordierite bearing mica gne ...
... (Kärki & Paulamäki 2006). In addition to those, pegmatitic granites and diabases form their own groups which can be identified both macroscopically and chemically. The members the T-series build up a transition series the end members of which are relatively dark and often cordierite bearing mica gne ...
Geology Level II - Marais des Cygnes District
... heard it, felt it, tasted it, or smelled it, they have a hard time thinking of it. Leaders should show and tell, rather than giving instructions verbally. Early elementary children are learning to sort things into categories. This makes collecting things important and fun at this age. Most are more ...
... heard it, felt it, tasted it, or smelled it, they have a hard time thinking of it. Leaders should show and tell, rather than giving instructions verbally. Early elementary children are learning to sort things into categories. This makes collecting things important and fun at this age. Most are more ...
BASIN ANALYSIS AND THE EVALUATION OF CRITICAL FACTORS FOR UNCONFORMITY-RELATED URANIUM
... hydrothermal alteration and uranium mineralization must have occurred at low water/rock ratios. This produced uneconomic amounts of U-bearing phosphate that was misidentified as uraninite in a previous report. A significant uranium deposit is unprobable based on the lack of unsupported radiogenic Pb ...
... hydrothermal alteration and uranium mineralization must have occurred at low water/rock ratios. This produced uneconomic amounts of U-bearing phosphate that was misidentified as uraninite in a previous report. A significant uranium deposit is unprobable based on the lack of unsupported radiogenic Pb ...
Sedimentary rock
Sedimentary rocks are types of rock that are formed by the deposition of material at the Earth's surface and within bodies of water. Sedimentation is the collective name for processes that cause mineral and/or organic particles (detritus) to settle and accumulate or minerals to precipitate from a solution. Particles that form a sedimentary rock by accumulating are called sediment. Before being deposited, sediment was formed by weathering and erosion in a source area, and then transported to the place of deposition by water, wind, ice, mass movement or glaciers which are called agents of denudation.The sedimentary rock cover of the continents of the Earth's crust is extensive, but the total contribution of sedimentary rocks is estimated to be only 8% of the total volume of the crust. Sedimentary rocks are only a thin veneer over a crust consisting mainly of igneous and metamorphic rocks. Sedimentary rocks are deposited in layers as strata, forming a structure called bedding. The study of sedimentary rocks and rock strata provides information about the subsurface that is useful for civil engineering, for example in the construction of roads, houses, tunnels, canals or other structures. Sedimentary rocks are also important sources of natural resources like coal, fossil fuels, drinking water or ores.The study of the sequence of sedimentary rock strata is the main source for scientific knowledge about the Earth's history, including palaeogeography, paleoclimatology and the history of life. The scientific discipline that studies the properties and origin of sedimentary rocks is called sedimentology. Sedimentology is part of both geology and physical geography and overlaps partly with other disciplines in the Earth sciences, such as pedology, geomorphology, geochemistry and structural geology.