The Bastnäs-type REE-mineralisations in north-western
... At a time when exploration for base- and precious metals in Sweden prosper and new copper, zinc and gold mines are put into production, it can be appropriate to remind about other, more exotic metals and minerals that are found and have been mined in Sweden. Among those are the rare earth element (R ...
... At a time when exploration for base- and precious metals in Sweden prosper and new copper, zinc and gold mines are put into production, it can be appropriate to remind about other, more exotic metals and minerals that are found and have been mined in Sweden. Among those are the rare earth element (R ...
Precambrian Time: Vast and Puzzling
... • The lack of Precambrian rock illustrates the law of superposition, it is covered by much younger strata • Precambrian rocks do show through the surface where younger strata are extensively eroded, such as in the Grand Canyon and in some mountain ranges • Shield – a large relatively flat expanse of ...
... • The lack of Precambrian rock illustrates the law of superposition, it is covered by much younger strata • Precambrian rocks do show through the surface where younger strata are extensively eroded, such as in the Grand Canyon and in some mountain ranges • Shield – a large relatively flat expanse of ...
Tectonics 1 - Montville.net
... • Ages of rocks near mid-ocean ridges was youngest • Age increased away from ridge • Age of rocks with same magnetism is same • Therefore must have been formed at mid ocean ridge and been forced away by formation of new crust ...
... • Ages of rocks near mid-ocean ridges was youngest • Age increased away from ridge • Age of rocks with same magnetism is same • Therefore must have been formed at mid ocean ridge and been forced away by formation of new crust ...
Definition of a Cenozoic alkaline magmatic
... Uplift and doming typically associated with mantle plumes are also largely absent. Also, to explain the areal distribution of the volcanism, an unusually large plume would have to underlie the entire southwest Pacific, or there would have to be hundreds of hot spots, which are not observed. Clearly, ...
... Uplift and doming typically associated with mantle plumes are also largely absent. Also, to explain the areal distribution of the volcanism, an unusually large plume would have to underlie the entire southwest Pacific, or there would have to be hundreds of hot spots, which are not observed. Clearly, ...
View - GFZpublic
... The Arabian Peninsula (Plate) is composed of the (western) Arabian Shield (AS) and the (eastern) Arabian Platform (Fig. 1). The AS constitutes a region of Precambrian/early Cambrian basement that became exposed as result of uplift associated with rifting along the Red Sea. T ...
... The Arabian Peninsula (Plate) is composed of the (western) Arabian Shield (AS) and the (eastern) Arabian Platform (Fig. 1). The AS constitutes a region of Precambrian/early Cambrian basement that became exposed as result of uplift associated with rifting along the Red Sea. T ...
The spatial extent and characteristics of block fields in Alpine areas
... 4th Swiss Geoscience Meeting, Bern 2006 ...
... 4th Swiss Geoscience Meeting, Bern 2006 ...
Planet Earth - Townley Grammar School
... Describe the common features of igneous, sedimentary and metamorphic rocks, and name some examples of each. Describe the layers that make up the Earth, and name the most common elements found in the crust. Describe continental drift, and use it to explain how similar rocks may be found in different ...
... Describe the common features of igneous, sedimentary and metamorphic rocks, and name some examples of each. Describe the layers that make up the Earth, and name the most common elements found in the crust. Describe continental drift, and use it to explain how similar rocks may be found in different ...
2.1 The Bushveld Complex is the largest known layered intrusion on
... established extensions of the western limb at its northern end beneath the Bushveld granite, and of the eastern limb beneath the Karoo sedimentary cover to the west of the Wonderkop fault (Eales and Cawthorn, 1996). Cawthorn and Webb (2001) proposed that Hall's initial model was correct, in that th ...
... established extensions of the western limb at its northern end beneath the Bushveld granite, and of the eastern limb beneath the Karoo sedimentary cover to the west of the Wonderkop fault (Eales and Cawthorn, 1996). Cawthorn and Webb (2001) proposed that Hall's initial model was correct, in that th ...
Plate tectonics and lithosphere architecture: temporal and spatial
... lithosphere ( < 2 0 0 > Ma; < 150 kin; plagioclasegarnet facies mantle). However the lithosphere architecture that results from such processes can be greatly disturbed by thermo-tectonic processes. While the Archaean crust of the Kaapvaal and Siberian cratons (> 2500 Ma) is associated with deep (c. ...
... lithosphere ( < 2 0 0 > Ma; < 150 kin; plagioclasegarnet facies mantle). However the lithosphere architecture that results from such processes can be greatly disturbed by thermo-tectonic processes. While the Archaean crust of the Kaapvaal and Siberian cratons (> 2500 Ma) is associated with deep (c. ...
Oceanic Crust
... • the night high tide is rising, swirling with a confused rush of waters against the rocks below …. • Once this rocky coast beneath me was a plain of sand; • then the sea rose and found a new shore line. • And again in some shadowy future the surf will have ground these rocks to sand and will have r ...
... • the night high tide is rising, swirling with a confused rush of waters against the rocks below …. • Once this rocky coast beneath me was a plain of sand; • then the sea rose and found a new shore line. • And again in some shadowy future the surf will have ground these rocks to sand and will have r ...
Metamorfismo Varisco em rochas ígneas do Câmbrico Inferior
... Discussion Only three spot analyses on individual clearly magmatic zircons from sample ALC-10 are statistically related but we consider them significant enough to define the age of magmatism at 526.5±9.9 Ma (Lower Cambrian following the ISC [11]). This result invalidates the previous interpretation ...
... Discussion Only three spot analyses on individual clearly magmatic zircons from sample ALC-10 are statistically related but we consider them significant enough to define the age of magmatism at 526.5±9.9 Ma (Lower Cambrian following the ISC [11]). This result invalidates the previous interpretation ...
Pfurr et al_Thrust tectonics_SMZ
... Within the RBNC four major lithotypes are distinguished (see Fig. 2): pre- or early-Damara orthogneisses and three partly interfingering sedimentary and volcaniclastic sequences of the Nosib Group. The latter are subdivided into a sequence of conglomerates and quartzites of the Kamtsas Formation wit ...
... Within the RBNC four major lithotypes are distinguished (see Fig. 2): pre- or early-Damara orthogneisses and three partly interfingering sedimentary and volcaniclastic sequences of the Nosib Group. The latter are subdivided into a sequence of conglomerates and quartzites of the Kamtsas Formation wit ...
Primary - Maggie`s Earth Adventures
... that went beyond the usual three-layer division of the crust, mantle and core. Then we read about the new discovery in the mantle and this prompted us to use the analogy of an onion rather than the usual diagram of an apple to help children think about the many sub layers that make up the three main ...
... that went beyond the usual three-layer division of the crust, mantle and core. Then we read about the new discovery in the mantle and this prompted us to use the analogy of an onion rather than the usual diagram of an apple to help children think about the many sub layers that make up the three main ...
The lithology, geochemistry, and metamorphic gradation of the
... Metamorphic evolution and its variability with depth The extent of individual metamorphic zones in the surroundings of the Cheb basin (see Fig. 1), namely the zones of biotite and chlorite, points to relatively flat, regional metamorphic zoning. The results of drilling exploration in the broader sur ...
... Metamorphic evolution and its variability with depth The extent of individual metamorphic zones in the surroundings of the Cheb basin (see Fig. 1), namely the zones of biotite and chlorite, points to relatively flat, regional metamorphic zoning. The results of drilling exploration in the broader sur ...
Auckland Islands Formation Volcanoes and
... pole and snow and ice is also found on land closer to the equator. ...
... pole and snow and ice is also found on land closer to the equator. ...
Sedimentary cover of the Ankara Mélange: role of the Upper
... Haymana and Tuz Gölü basins, all of which record key events in the closure history of the İzmirAnkara-Erzincan Ocean. A key area is the Late Cretaceous to Mid-Eocene Kırıkkale Basin, which straddles the Ankara Mélange to the west and the Kırşehir Massif to the east. Here, we re-evaluate the tectonic ...
... Haymana and Tuz Gölü basins, all of which record key events in the closure history of the İzmirAnkara-Erzincan Ocean. A key area is the Late Cretaceous to Mid-Eocene Kırıkkale Basin, which straddles the Ankara Mélange to the west and the Kırşehir Massif to the east. Here, we re-evaluate the tectonic ...
Evolution of early continental crust
... and evolve towards a positive εNd with time. Crustal rocks that contain similar isotopic ratios as the DM are called juvenile, while rocks enriched in initial isotopic ratios are classified as evolved and contain a component of the older crust. The Nd-isotopic composition of Archaean rocks can thus ...
... and evolve towards a positive εNd with time. Crustal rocks that contain similar isotopic ratios as the DM are called juvenile, while rocks enriched in initial isotopic ratios are classified as evolved and contain a component of the older crust. The Nd-isotopic composition of Archaean rocks can thus ...
New geologic mapping and SHRIMP U
... the continental-margin arc was active for at least ~60–80 m.y. prior to being intruded by the mid-Cretaceous stitching plutons. 2. The Alisitos island arc was probably established ca. 140 Ma (Silver and Chappell, 1988) above an east- or west-facing subduction zone (Fig. 2A). The volcano-sedimentary ...
... the continental-margin arc was active for at least ~60–80 m.y. prior to being intruded by the mid-Cretaceous stitching plutons. 2. The Alisitos island arc was probably established ca. 140 Ma (Silver and Chappell, 1988) above an east- or west-facing subduction zone (Fig. 2A). The volcano-sedimentary ...
Ontario geological map atlas: bedrock geology
... range in age, from 3.17 to 2.71 Ga. These suites have been intruded by plutons of massive tonalite. Muscovite-bearing granitic rocks (unit 13), which formed between 2.67 and 2.69 Ga, predominate in the metasedimentary subprovinces and postdate tonalites in those subprovinces. Two-mica granites also ...
... range in age, from 3.17 to 2.71 Ga. These suites have been intruded by plutons of massive tonalite. Muscovite-bearing granitic rocks (unit 13), which formed between 2.67 and 2.69 Ga, predominate in the metasedimentary subprovinces and postdate tonalites in those subprovinces. Two-mica granites also ...
precambrian rocks of the taos range and vicinity, northern new mexico
... of the important Precambrian rock types in the area. McKinlay (1956, 1957) mapped Precambrian rocks in the northern part of the range as part of quadrangle mapping. Much of the Taos Range was mapped by Clark and Read (1972) as part of their study of the Eagle Nest region. These investigations served ...
... of the important Precambrian rock types in the area. McKinlay (1956, 1957) mapped Precambrian rocks in the northern part of the range as part of quadrangle mapping. Much of the Taos Range was mapped by Clark and Read (1972) as part of their study of the Eagle Nest region. These investigations served ...
a geological fieldwork report on the geology of
... This geological report describes an area that is around Matuu town towards the North of Ikaatini and from Katulani towards Mavoloni to the west located in the North of Machakos County in Kenya. It is bounded by Northings 98 72 and 9884 and Easting 3208 and 3469. It lies on the east Africa Mozambique ...
... This geological report describes an area that is around Matuu town towards the North of Ikaatini and from Katulani towards Mavoloni to the west located in the North of Machakos County in Kenya. It is bounded by Northings 98 72 and 9884 and Easting 3208 and 3469. It lies on the east Africa Mozambique ...
Lecture W6-L15-17
... Migmatitic complexes (≈ metamorphic core complexes) do rise diapirically, or as tectonic-initiated domes originating in an extension situation. They can rise quite efficiently, especially if extension is present. But this seems to be more viable in the lower crust… or in very hot upper crust (theref ...
... Migmatitic complexes (≈ metamorphic core complexes) do rise diapirically, or as tectonic-initiated domes originating in an extension situation. They can rise quite efficiently, especially if extension is present. But this seems to be more viable in the lower crust… or in very hot upper crust (theref ...
Preliminary Geochemical Analysis of Various Gold Occurrences
... Grades of up to 200 g/t Au have been reported from grab samples collected from quartz veins exposed in trenches. At the South Hamilton Road occurrence, which lies within the boundaries of CFB Gagetown, grab samples collected from outcrop exposures yielded up to 5 g/t Au (McLeod, 2000). Overall, the ...
... Grades of up to 200 g/t Au have been reported from grab samples collected from quartz veins exposed in trenches. At the South Hamilton Road occurrence, which lies within the boundaries of CFB Gagetown, grab samples collected from outcrop exposures yielded up to 5 g/t Au (McLeod, 2000). Overall, the ...
Part A - Parkway C-2
... The most dangerous place to live in the vicinity of a cascade volcano ( ie Mt. St. Helens) would be a. in one of the river valleys at the base of he volcano b. 100 km. to the east, where ash could be deposited c. on top of a nearby non-volcanic ridge d. in any town within site of the volcano ...
... The most dangerous place to live in the vicinity of a cascade volcano ( ie Mt. St. Helens) would be a. in one of the river valleys at the base of he volcano b. 100 km. to the east, where ash could be deposited c. on top of a nearby non-volcanic ridge d. in any town within site of the volcano ...
Baltic Shield
The Baltic Shield (sometimes referred to as the Fennoscandian Shield) is located in Fennoscandia (Norway, Sweden and Finland), northwest Russia and under the Baltic Sea. The Baltic Shield is defined as the exposed Precambrian northwest segment of the East European Craton. It is composed mostly of Archean and Proterozoic gneisses and greenstones which have undergone numerous deformations through tectonic activity (see Geology of Fennoscandia map [1]). The Baltic Shield contains the oldest rocks of the European continent. The lithospheric thickness is about 200-300 km. During the Pleistocene epoch, great continental ice sheets scoured and depressed the shield's surface, leaving a thin covering of glacial material and innumerable lakes and streams. The Baltic Shield is still rebounding today following the melting of the thick glaciers during the Quaternary Period.