Carboniferous and Permian igneous rocks of Great Britain
... Britain. However, during the Dinantian activity in Scotland, basic magmas were commonly accompanied by lesser amounts of more differentiated associates including mugearites, benmoreites, trachytes and rhyolites. Silica-undersaturated evolved compositions such as phonolitic trachytes and phonolites a ...
... Britain. However, during the Dinantian activity in Scotland, basic magmas were commonly accompanied by lesser amounts of more differentiated associates including mugearites, benmoreites, trachytes and rhyolites. Silica-undersaturated evolved compositions such as phonolitic trachytes and phonolites a ...
GS-15
... possibly related to similar rocks in the adjacent Split Lake Block; mafic metavolcanic rocks (amphibolite); metasedimentary rocks; late-stage granitic and tonalitic intrusive rocks; and latest stage (Paleoproterozoic) mafic dikes. All rock types, except for the mafic dikes, are Archean and affected by ...
... possibly related to similar rocks in the adjacent Split Lake Block; mafic metavolcanic rocks (amphibolite); metasedimentary rocks; late-stage granitic and tonalitic intrusive rocks; and latest stage (Paleoproterozoic) mafic dikes. All rock types, except for the mafic dikes, are Archean and affected by ...
Geology and petrology of the felsic intrusions in the
... Promotor: Prof. Dr. J. De Grave Co-promotor: Prof. Dr. L. Tack Leescommissie: Prof. Dr. P. Van den haute, Prof. Dr. M. Fernandez-Alonso ...
... Promotor: Prof. Dr. J. De Grave Co-promotor: Prof. Dr. L. Tack Leescommissie: Prof. Dr. P. Van den haute, Prof. Dr. M. Fernandez-Alonso ...
Geology of Base-Metal Deposits
... Thus, in a Cu–Zn deposit the copper may be contained in chalcopyrite and/or bornite, and the zinc in sphalerite. Other sulfide minerals usually found in association with these ore minerals are pyrite and/or pyrrhotite; common accessory oxide minerals are magnetite and hematite. Geologists recognize ...
... Thus, in a Cu–Zn deposit the copper may be contained in chalcopyrite and/or bornite, and the zinc in sphalerite. Other sulfide minerals usually found in association with these ore minerals are pyrite and/or pyrrhotite; common accessory oxide minerals are magnetite and hematite. Geologists recognize ...
Title K-feldspar sand-grain provenance in the Triassic
... However, although these techniques enable the likely sourcelands to be determined, the transport history experienced by individual framework components remains unconstrained. Robust minerals such as zircon can be recycled through one or more intermediary sediments or sedimentary rock (Dickinson et a ...
... However, although these techniques enable the likely sourcelands to be determined, the transport history experienced by individual framework components remains unconstrained. Robust minerals such as zircon can be recycled through one or more intermediary sediments or sedimentary rock (Dickinson et a ...
VOLCANIC-HOSTED MASSIVE SULPHIDE DEPOSITS
... Carbonate-Sericite-Chlorite Alteration,Victoria Mine VMS DEPOSITS (cont’d) ...
... Carbonate-Sericite-Chlorite Alteration,Victoria Mine VMS DEPOSITS (cont’d) ...
geological solutions concluded by petroleum geochemical data in
... amount was reduced towards the shallower areas. This aspect is strengthened by the fact that in some outcrops, like the Paliogrimbiani section (Rigakis, 1999), only the deepest shale horizon contains significant amounts of organic matter, while the overlying horizons present low TOC content. Obviou ...
... amount was reduced towards the shallower areas. This aspect is strengthened by the fact that in some outcrops, like the Paliogrimbiani section (Rigakis, 1999), only the deepest shale horizon contains significant amounts of organic matter, while the overlying horizons present low TOC content. Obviou ...
Petrogenesis of subvolcanic rocks from the Khunik prospecting area
... geology map (Movahed Avval and Emami, 1978). Detailed field work and geological mapping in 1:20000 were carried out by the author. The major part of the study area is covered by Cenozoic volcanic rocks that are intruded by subvolcanic rocks (Fig. 2). According to the studies, the lithology of the Kh ...
... geology map (Movahed Avval and Emami, 1978). Detailed field work and geological mapping in 1:20000 were carried out by the author. The major part of the study area is covered by Cenozoic volcanic rocks that are intruded by subvolcanic rocks (Fig. 2). According to the studies, the lithology of the Kh ...
The Pecos greenstone belt - New Mexico Geological Society
... central part of the belt, and displays both concordant and discordant relations. These rocks are distinguished from the mafic flows by their coarser grain size and distinct remnants of diabasic to ophitic textures. Felsic rocks are represented by well foliated, grayish, mediumto fine-grained quartz ...
... central part of the belt, and displays both concordant and discordant relations. These rocks are distinguished from the mafic flows by their coarser grain size and distinct remnants of diabasic to ophitic textures. Felsic rocks are represented by well foliated, grayish, mediumto fine-grained quartz ...
4. Kittitas Valley
... The flows of the Grand Ronde member of the Columbia River Basalts are basalt. Locally, flows include a pillow-palagonite complex at their base, a reflection of the wet landscape which persisted between eruptive events. Elsewhere these flows display classic columnar structure, a reflection of the cooling ...
... The flows of the Grand Ronde member of the Columbia River Basalts are basalt. Locally, flows include a pillow-palagonite complex at their base, a reflection of the wet landscape which persisted between eruptive events. Elsewhere these flows display classic columnar structure, a reflection of the cooling ...
CODES SEG Student Chapter Student-Industry Field Trip South Ural
... near fault zones in sedimentary or volcano-sedimentary sequences. They are related to dikes and small intrusions but are generally some distance from major granitic plutons. The ore is hosted in veins (concordant and discordant), stringer disseminated zones and mineralized dykes. The distribution of ...
... near fault zones in sedimentary or volcano-sedimentary sequences. They are related to dikes and small intrusions but are generally some distance from major granitic plutons. The ore is hosted in veins (concordant and discordant), stringer disseminated zones and mineralized dykes. The distribution of ...
petrology of the sthathbogie batholith: a cordierite-bearing
... sedimentary rocks on the southern side of the granite are truncated by the contact. However, the strike of the sedimentary rocks appears to be deflected near the western end of the batholith (Vandenberg & Garratt 1976), with the divergence becoming apparent within 20 km of the granite contact (Fig. ...
... sedimentary rocks on the southern side of the granite are truncated by the contact. However, the strike of the sedimentary rocks appears to be deflected near the western end of the batholith (Vandenberg & Garratt 1976), with the divergence becoming apparent within 20 km of the granite contact (Fig. ...
5. Nooksack Valley
... The Nooksack Group of volcanically-derived sediments and minor volcanic rocks accumulated on the Chilliwack Terrane in Early Cretaceous time, before that terrane was accreted to the continental margin. At that time it was probably an offshore island belt, not unlike the modern islands of Japan. Thes ...
... The Nooksack Group of volcanically-derived sediments and minor volcanic rocks accumulated on the Chilliwack Terrane in Early Cretaceous time, before that terrane was accreted to the continental margin. At that time it was probably an offshore island belt, not unlike the modern islands of Japan. Thes ...
26. SULFUR ISOTOPE RECONNAISSANCE OF EPIGENETIC
... absence as disseminated replacements of primary oxide and ferromagnesian minerals in the wall rocks adjacent to veinlets and fractures. With a finite reservoir of sulfur and with the wide range in the mole fractions of oxidized and reduced species of sulfur, as previously assumed, the measured isoto ...
... absence as disseminated replacements of primary oxide and ferromagnesian minerals in the wall rocks adjacent to veinlets and fractures. With a finite reservoir of sulfur and with the wide range in the mole fractions of oxidized and reduced species of sulfur, as previously assumed, the measured isoto ...
Magnetization properties of intrusive/extrusive rocks from East Maio
... The Mesozoic succession appears to have been planed off and overlain with marked unconformity by a Tertiary sequence of volcanics and sedimentary rocks. The lower part of this younger series, the Casas Velhas Formation, consists of lava deltas and subaerial ankaramitic flows which have been tentativ ...
... The Mesozoic succession appears to have been planed off and overlain with marked unconformity by a Tertiary sequence of volcanics and sedimentary rocks. The lower part of this younger series, the Casas Velhas Formation, consists of lava deltas and subaerial ankaramitic flows which have been tentativ ...
Depositional Environments of Permian Rocks of the
... chert nodules vary in size from 5 to 30 cm and are mainly composed of microcrystalline quartz locally disseminated with calcite rhombs. There seems to be a certain degree of similarity in lithology between the Unit C and the Unit D, except that the Unit D contains chert nodules and some foraminifera ...
... chert nodules vary in size from 5 to 30 cm and are mainly composed of microcrystalline quartz locally disseminated with calcite rhombs. There seems to be a certain degree of similarity in lithology between the Unit C and the Unit D, except that the Unit D contains chert nodules and some foraminifera ...
Chapter 5
... with refinements has been used by geologists, soil scientists, and oceanographers ever since. In this classification the coarsest particles are boulders, which are more than 256 millimeters (about 10 inches) in diameter. Although boulders, cobbles, and pebbles occur in the ocean, most marine sedimen ...
... with refinements has been used by geologists, soil scientists, and oceanographers ever since. In this classification the coarsest particles are boulders, which are more than 256 millimeters (about 10 inches) in diameter. Although boulders, cobbles, and pebbles occur in the ocean, most marine sedimen ...
AM N Pz Scale 1:8 500 000 - Norges geologiske undersøkelse
... by the Caledonide Orogen, which extends, in Norway, over 1500 km from Stavanger in the southwest to the northernmost part of the country (Figure 1). Understanding of the geology of the Caledonides in Scandinavia is in a period of flux following recognition, through the last decade, that a model cons ...
... by the Caledonide Orogen, which extends, in Norway, over 1500 km from Stavanger in the southwest to the northernmost part of the country (Figure 1). Understanding of the geology of the Caledonides in Scandinavia is in a period of flux following recognition, through the last decade, that a model cons ...
SUPERFAULTS AND PSEUDOTACHYLYTES
... The photomicrograph images in Figure 5 illustrate strong evidence of multiple deformation events at the Homestake site. Figures 5a, 5b, and 5c illustrate a well-developed foliation event developed under ductile conditions, followed by a second brittle event, shearing the foliation at high angles. F ...
... The photomicrograph images in Figure 5 illustrate strong evidence of multiple deformation events at the Homestake site. Figures 5a, 5b, and 5c illustrate a well-developed foliation event developed under ductile conditions, followed by a second brittle event, shearing the foliation at high angles. F ...
Caribbean Geological Conference 18th
... its southeast end the periodotite divides into two forks which are separated by a complex area of basalts, diabases, gabbros, tuffs, breccias and cherts. Because some of these rocks between the forks are deformed and metamorphosed, Bowin (1966) classified them with the Duarte Formation (Complex). Ho ...
... its southeast end the periodotite divides into two forks which are separated by a complex area of basalts, diabases, gabbros, tuffs, breccias and cherts. Because some of these rocks between the forks are deformed and metamorphosed, Bowin (1966) classified them with the Duarte Formation (Complex). Ho ...
Update and economic significance of geological mapping in the
... Intermediate to felsic volcaniclastic rocks (unit 2) Intermediate to felsic volcaniclastic rocks crop out along the north and, to a lesser extent, south shores of Garner Lake, and form a section more than 1 km thick. The predominant rock types are dacite and rhyolite breccia and tuff-breccia (subuni ...
... Intermediate to felsic volcaniclastic rocks (unit 2) Intermediate to felsic volcaniclastic rocks crop out along the north and, to a lesser extent, south shores of Garner Lake, and form a section more than 1 km thick. The predominant rock types are dacite and rhyolite breccia and tuff-breccia (subuni ...
Comparison studies of tin deposits (Priamurye, Russia) using the Aitchison’s methodology
... it allows an approximation to the conditions of their formation and it can reveal criteria for the characterization of large commercial deposits. Those can be used when forecasting ore deposits. This problem is very important for the geology of ore deposits, but it is very complicated because every ...
... it allows an approximation to the conditions of their formation and it can reveal criteria for the characterization of large commercial deposits. Those can be used when forecasting ore deposits. This problem is very important for the geology of ore deposits, but it is very complicated because every ...
The Floor of the Arctic Ocean in Photographs
... on continental slopes became oversteepened and then slumped after being triggered by an event such as an earthquake. The mud suspension flowed down the continental slope and out across the basin floor depositingits load of fine-grained material evenly to form an extremely flat surface. Photographs f ...
... on continental slopes became oversteepened and then slumped after being triggered by an event such as an earthquake. The mud suspension flowed down the continental slope and out across the basin floor depositingits load of fine-grained material evenly to form an extremely flat surface. Photographs f ...
View Entire Bulletin - Ministry of Energy and Mines and Responsible
... area, comprises extensive pyroxene and plagioclase-rich andesitic and basaltic flows, breccia, conglomerate, and lahar deposits. Comagmatic intrusive rocks are mostly diorite with subordinate syenite. The Eastern Belt consists of submarine volcanic sedimentary rocks in the north but i s dominated in ...
... area, comprises extensive pyroxene and plagioclase-rich andesitic and basaltic flows, breccia, conglomerate, and lahar deposits. Comagmatic intrusive rocks are mostly diorite with subordinate syenite. The Eastern Belt consists of submarine volcanic sedimentary rocks in the north but i s dominated in ...
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.