high-sulphidation, epithermal-style
... high-sulphidation alteration assemblage pyrophyllite–alunite–quartz–kaolinite–hematite–rutile–lazulite, are associated with discrete areas of massive and, locally, vuggy silicic alteration, containing gold, and anomalous concentrations of copper, arsenic and/or antimony. On the northern Burin Penins ...
... high-sulphidation alteration assemblage pyrophyllite–alunite–quartz–kaolinite–hematite–rutile–lazulite, are associated with discrete areas of massive and, locally, vuggy silicic alteration, containing gold, and anomalous concentrations of copper, arsenic and/or antimony. On the northern Burin Penins ...
Uranium - Geological Survey
... underground bulk sampling and pilot plant test work, which was completed in March 1973. This investigation indicated the existence of a very large, low-grade deposit of uranium that could be mined by open-pit methods and also showed that the uranium could be recovered by means of conventional metall ...
... underground bulk sampling and pilot plant test work, which was completed in March 1973. This investigation indicated the existence of a very large, low-grade deposit of uranium that could be mined by open-pit methods and also showed that the uranium could be recovered by means of conventional metall ...
L.S. Normore - Department of Natural Resources
... rocks to the east (Figure 2). Additional rock types, which have been observed locally within LC 1, include dark reddish-purple, aphanitic, brecciated basalt, dark purple amygdaloidal basalt, and also rare occurrences of medium greengrey, flow-laminated basalt. Love Cove Group Lithofacies 2 (LC 2) Th ...
... rocks to the east (Figure 2). Additional rock types, which have been observed locally within LC 1, include dark reddish-purple, aphanitic, brecciated basalt, dark purple amygdaloidal basalt, and also rare occurrences of medium greengrey, flow-laminated basalt. Love Cove Group Lithofacies 2 (LC 2) Th ...
Preliminary Geologic Map of the Picture Rock 7.5
... is privately owned. The eastern-most part of the village of Cerrillos lies in the Picture Rock quadrangle. The San Marcos Pueblo Grant occupies about 2.5 square miles in the central part of the Picture Rock quadrangle. The Ortiz Mine Grant covers about 7.5 square miles in the southwest corner of the ...
... is privately owned. The eastern-most part of the village of Cerrillos lies in the Picture Rock quadrangle. The San Marcos Pueblo Grant occupies about 2.5 square miles in the central part of the Picture Rock quadrangle. The Ortiz Mine Grant covers about 7.5 square miles in the southwest corner of the ...
A FIRST GEOLOGICAL MAP OF MAKIRA, SOLOMON ISLANDS
... limestones, cherts, sandstones, and basaltic breccias (herein termed the Waihaoru Sedimentary Group or WSG). The Wairahito Volcanic Group comprises a sequence of basalt, dolerite and gabbro sheets and dykes with local ultramafic sills and intrusions. A cumulate thickness is difficult to estimate as ...
... limestones, cherts, sandstones, and basaltic breccias (herein termed the Waihaoru Sedimentary Group or WSG). The Wairahito Volcanic Group comprises a sequence of basalt, dolerite and gabbro sheets and dykes with local ultramafic sills and intrusions. A cumulate thickness is difficult to estimate as ...
Porphyry Cu mineralization related to the small Tertiary volcanic
... mineralization (0.3 % Cu, 0.3-0.5 ppm Au) is spatially and temporarily associated with Tertiary subvolcanic intrusions of latitic and latitic-andesitic composition. The intrusions occurred during Oligo-Miocene time (24 to 27 Ma), a period of intensive tectono-magmatic and ore-forming processes.. The ...
... mineralization (0.3 % Cu, 0.3-0.5 ppm Au) is spatially and temporarily associated with Tertiary subvolcanic intrusions of latitic and latitic-andesitic composition. The intrusions occurred during Oligo-Miocene time (24 to 27 Ma), a period of intensive tectono-magmatic and ore-forming processes.. The ...
Pulverized fault rocks and damage asymmetry along the Arima
... In this paper we present and discuss new observations of pulverized rocks, along a strand of the Arima-Takatsuki Tectonic Line (ATTL) in Japan, and characterize the fault structure, damage distribution and textural features of the pulverized rocks. To provide additional constraints on the possible g ...
... In this paper we present and discuss new observations of pulverized rocks, along a strand of the Arima-Takatsuki Tectonic Line (ATTL) in Japan, and characterize the fault structure, damage distribution and textural features of the pulverized rocks. To provide additional constraints on the possible g ...
A combined study of melt inclusions and classical petrology on the
... The quartzo-feldspathic metatexites are mainly composed of Qtz + Pl + Kfs + Bt + Sil + Grt and probably derived from a greywacke protolith. Muscovite is very rare. The former presence of melt is recorded by melt inclusions and melt pseudomorphs at the microscale, and by peraluminous leucogranitic le ...
... The quartzo-feldspathic metatexites are mainly composed of Qtz + Pl + Kfs + Bt + Sil + Grt and probably derived from a greywacke protolith. Muscovite is very rare. The former presence of melt is recorded by melt inclusions and melt pseudomorphs at the microscale, and by peraluminous leucogranitic le ...
GEOLOGY OF PRE-MESOZOIC BEDROCK OF THE AMHERST
... places and in other places by east-dipping normal faults of small displacement (Wheeler, 1937; Krynine, 1950). The northern basin, called the Montague (Emerson, 1917; Goldstein,1976) or Deerfield basin (Chandler, 1978), extends 24 km northward from Amherst to the vicinity of Bernardston, Massachuset ...
... places and in other places by east-dipping normal faults of small displacement (Wheeler, 1937; Krynine, 1950). The northern basin, called the Montague (Emerson, 1917; Goldstein,1976) or Deerfield basin (Chandler, 1978), extends 24 km northward from Amherst to the vicinity of Bernardston, Massachuset ...
an example to sepiolite formation in volcanic belts by
... manganese dendrites and stainings in millirhetric scale along fractures. Zeolitization, recognized by its pale green color is also common. Pumice fragments, less than 1 cm in diameter, and irregular shaped, white silica nodules of variable size, which are thought to have generated from silica-rich i ...
... manganese dendrites and stainings in millirhetric scale along fractures. Zeolitization, recognized by its pale green color is also common. Pumice fragments, less than 1 cm in diameter, and irregular shaped, white silica nodules of variable size, which are thought to have generated from silica-rich i ...
Geology of the Corona South quadrangle and the Santa Ana
... The rejriou in jreneral eonsists of alluviated valleys separated hy rather narrow mountain raufies, whicli trend northwestward. The tlat lanils are mostly less tiian 1, ;")()() feet above sea level and slope jrently up to the bases of the mountain raiifres. The mountains rise sharply above the alluv ...
... The rejriou in jreneral eonsists of alluviated valleys separated hy rather narrow mountain raufies, whicli trend northwestward. The tlat lanils are mostly less tiian 1, ;")()() feet above sea level and slope jrently up to the bases of the mountain raiifres. The mountains rise sharply above the alluv ...
bulletin of the geological society of america vol, 68
... 70° E. and dips 5°-10° SE. The tuff ranges from buff to pink and shows various degrees of density and coherence. Some of the most firmly welded material contains fragments and crystals of quartz and feldspar in a glassy tuffaceous matrix. Other less dense and less coherent layers consist predominate ...
... 70° E. and dips 5°-10° SE. The tuff ranges from buff to pink and shows various degrees of density and coherence. Some of the most firmly welded material contains fragments and crystals of quartz and feldspar in a glassy tuffaceous matrix. Other less dense and less coherent layers consist predominate ...
Iron Oxide Copper-Gold Deposits: Geology, Space
... Uncertainty also exists about the original tectonic settings of several major IOCG districts, and considerably more research is needed before it will be clear whether these deposits are linked by a single family of related genetic mechanisms or whether they can form in a range of fundamentally diffe ...
... Uncertainty also exists about the original tectonic settings of several major IOCG districts, and considerably more research is needed before it will be clear whether these deposits are linked by a single family of related genetic mechanisms or whether they can form in a range of fundamentally diffe ...
SILURIAN CLIFFS
... resistance. Wave-cut notches occur when the rocks forming a cliff’s lower part are less resistant to abrasion than those in the cliff’s upper part. The appearance of cliffs changes constantly. Severe storms, during which the sea level rises and the intensity of wave activity increases considerably, ...
... resistance. Wave-cut notches occur when the rocks forming a cliff’s lower part are less resistant to abrasion than those in the cliff’s upper part. The appearance of cliffs changes constantly. Severe storms, during which the sea level rises and the intensity of wave activity increases considerably, ...
Geology of the Kimberley Region, Western Australia: The East
... Zone as batholiths and stocks. The end product of this cycle of activity is the igneousmetamorphic complex called the Lamboo Complex. The Tickalara Metamorphics have been subdivided into three metamorphic zones on the basis of mineralogical and textural changes in three groups of rocks—pelitic, aren ...
... Zone as batholiths and stocks. The end product of this cycle of activity is the igneousmetamorphic complex called the Lamboo Complex. The Tickalara Metamorphics have been subdivided into three metamorphic zones on the basis of mineralogical and textural changes in three groups of rocks—pelitic, aren ...
Aggregate terminology - Applied Petrography Group
... Classifier – Particle sizing device based upon the relative motions of particles in a viscous fluid, air or water (Smith and Collis 1993). Clast – A rock fragment; commonly applied to a fragment of pre-existing rock included in a younger sediment (Smith and Collis 1993). Clastic – A term relating to ...
... Classifier – Particle sizing device based upon the relative motions of particles in a viscous fluid, air or water (Smith and Collis 1993). Clast – A rock fragment; commonly applied to a fragment of pre-existing rock included in a younger sediment (Smith and Collis 1993). Clastic – A term relating to ...
I. Knight - Department of Natural Resources
... The shale member rapidly gives way upward into the upper member of grey shales interbedded with bioturbated, thin- to thick-bedded, white- to rusty-weathering, siltstone and very fine sandstone, and some black limestone. The succession ranges through a number of facies associations and small-scale p ...
... The shale member rapidly gives way upward into the upper member of grey shales interbedded with bioturbated, thin- to thick-bedded, white- to rusty-weathering, siltstone and very fine sandstone, and some black limestone. The succession ranges through a number of facies associations and small-scale p ...
Kimberlites and Lamproites: Primary Sources of Diamond
... data imply that diamonds cannot be phenocrysts in kimberlite or lamproite, and that their origins must lie within rocks sampled by these magmas during their ascent toward the crust. Additional evidence regarding the origin of diamonds has stemmed from studies of upper mantle-derived xenoliths and mi ...
... data imply that diamonds cannot be phenocrysts in kimberlite or lamproite, and that their origins must lie within rocks sampled by these magmas during their ascent toward the crust. Additional evidence regarding the origin of diamonds has stemmed from studies of upper mantle-derived xenoliths and mi ...
The Skaergaard Layered Series. Part II
... define the extent and trajectories of magmatic flow and thereby lead to a better understanding of internal processes during cooling and crystallization. Recent studies of the layered rocks of the Oman Ophiolite, for example, have revealed that the gabbros have been intensely deformed while in the ma ...
... define the extent and trajectories of magmatic flow and thereby lead to a better understanding of internal processes during cooling and crystallization. Recent studies of the layered rocks of the Oman Ophiolite, for example, have revealed that the gabbros have been intensely deformed while in the ma ...
SESSIONE TS1.3 Processi magmatici e metamorfici nella crosta
... Hercynian crustal sections exposed in Calabria. In the Sila and Serre massif the granitoids are stacked to make a pile of tabular intrusions with a cumulative thickness of 9 to 13 km. Composition typically ranges from tonalite to granite, but minor dioritic and gabbroic bodies are also present. Magm ...
... Hercynian crustal sections exposed in Calabria. In the Sila and Serre massif the granitoids are stacked to make a pile of tabular intrusions with a cumulative thickness of 9 to 13 km. Composition typically ranges from tonalite to granite, but minor dioritic and gabbroic bodies are also present. Magm ...
Laramie Peak shear system, central Laramie
... strain is distributed in sialic crust during an oceanic arc– continental margin collision. As magmatism (and attendant thermal softening) did not occur in the Wyoming province during its partial subduction beneath the oceanic-arc terranes of the Colorado province, the crystal-plastic strain manifest ...
... strain is distributed in sialic crust during an oceanic arc– continental margin collision. As magmatism (and attendant thermal softening) did not occur in the Wyoming province during its partial subduction beneath the oceanic-arc terranes of the Colorado province, the crystal-plastic strain manifest ...
Class worksheet for Chapter 5: An Introduction to
... may have been produced will solidify immediately as glass. Any minerals that may have been stable at the run temperature, will of course, be present as crystals, either recrystallized in the solid state below the melting temperature, or imbedded in glass if some melting occurred. Several runs are re ...
... may have been produced will solidify immediately as glass. Any minerals that may have been stable at the run temperature, will of course, be present as crystals, either recrystallized in the solid state below the melting temperature, or imbedded in glass if some melting occurred. Several runs are re ...
Geology of granite - Royal Society of Western Australia
... crust. Between these end members, there is a spectrum of hybrid processes, including mixing of basaltic and granitic magmas, and contamination of basaltic magma by partial melts of different kinds of continental crust. Although superficially simple and similar, most granites reflect a complicated hi ...
... crust. Between these end members, there is a spectrum of hybrid processes, including mixing of basaltic and granitic magmas, and contamination of basaltic magma by partial melts of different kinds of continental crust. Although superficially simple and similar, most granites reflect a complicated hi ...
Tectonic Setting and Regional Geology of the KSZ
... the metasediments in the southern sector of the shear zone indicate metamorphic conditions of c. 700° C and 20 km crustal depth. In the northern part of the KSZ lithologies preserve most of their primary compositions, textures and structures. Sedimentary structures and textures (cross and graded bed ...
... the metasediments in the southern sector of the shear zone indicate metamorphic conditions of c. 700° C and 20 km crustal depth. In the northern part of the KSZ lithologies preserve most of their primary compositions, textures and structures. Sedimentary structures and textures (cross and graded bed ...
A detrital record of the Nile River and its catchment
... found. Formation of the Arabian–Nubian Shield began with the initiation of subduction and development of magmatic arcs at 870 Ma. Terrane amalgamation associated with closure of the Mozambique Ocean and amalgamation of East and West Gondwana took place between c. 780 and c. 600 Ma (Johnson & Woldeha ...
... found. Formation of the Arabian–Nubian Shield began with the initiation of subduction and development of magmatic arcs at 870 Ma. Terrane amalgamation associated with closure of the Mozambique Ocean and amalgamation of East and West Gondwana took place between c. 780 and c. 600 Ma (Johnson & Woldeha ...
Clastic rock
Clastic rocks are composed of fragments, or clasts, of pre-existing minerals and rock. A clast is a fragment of geological detritus, chunks and smaller grains of rock broken off other rocks by physical weathering. Geologists use the term clastic with reference to sedimentary rocks as well as to particles in sediment transport whether in suspension or as bed load, and in sediment deposits.