magnetite and ilmenite from some finnish rocks
... The first two of these rocks are anorogenic, practically unmetamorphosed late Precambrian igneous rocks, the others are metamorphosed Svecofennian deep-seated rocks. In olivine diabase and gabbroanorthosite the Fe-Ti oxides are xenomorphic filling the spaces between other minerals (Fig. 2). Thus, th ...
... The first two of these rocks are anorogenic, practically unmetamorphosed late Precambrian igneous rocks, the others are metamorphosed Svecofennian deep-seated rocks. In olivine diabase and gabbroanorthosite the Fe-Ti oxides are xenomorphic filling the spaces between other minerals (Fig. 2). Thus, th ...
STP 3 & 4
... Major tectonic events in the site region include three compressional deformational events (orogenies) and at least two major extensional events. Direct evidence for most of these events is largely buried beneath the coastal plain sediments in the site region. 2.5S.1.1.2.1 Grenville Orogeny The earli ...
... Major tectonic events in the site region include three compressional deformational events (orogenies) and at least two major extensional events. Direct evidence for most of these events is largely buried beneath the coastal plain sediments in the site region. 2.5S.1.1.2.1 Grenville Orogeny The earli ...
GROUNDWATER ATLAS OF THE UNITED STATES
... Most of the illustrations in the Atlas use color to emphasize the information and to increase the clarity and understandability of the complex data or interpretive material that is presented. To help maintain consistency, each principal aquifer is assigned a unique color that is used to map the aqui ...
... Most of the illustrations in the Atlas use color to emphasize the information and to increase the clarity and understandability of the complex data or interpretive material that is presented. To help maintain consistency, each principal aquifer is assigned a unique color that is used to map the aqui ...
Fault geometry and Cenozoic kinematic history of the San Luis B
... and is bordered by the Sangre de Cristo Mountains on the east, and the Tusas and San Juan Mountains on the west. The southern part of the basin is a physiographically and geologically unique terrain known as the Taos Plateau. The plateau is composed mostly of Pliocene basaltic ...
... and is bordered by the Sangre de Cristo Mountains on the east, and the Tusas and San Juan Mountains on the west. The southern part of the basin is a physiographically and geologically unique terrain known as the Taos Plateau. The plateau is composed mostly of Pliocene basaltic ...
Geosciences Course Descriptions - The University of Texas at Dallas
... epidemiology and biostatistics. U.S. regulatory agencies. Ethics, risk assessment and public policy. Diseases spread by food and water. Lung diseases associated with particles and fibers. Health significance of exposures to arsenic, cadmium, chromium, lead and mercury compounds and to chemical subst ...
... epidemiology and biostatistics. U.S. regulatory agencies. Ethics, risk assessment and public policy. Diseases spread by food and water. Lung diseases associated with particles and fibers. Health significance of exposures to arsenic, cadmium, chromium, lead and mercury compounds and to chemical subst ...
40. Evolution of a layered diorite-gabbro to become a layered quartz
... Sudbury, Canada, is shown to be folded into a tight, nearly isoclinal anticline and then to evolve into a layered quartz monzonite-granodiorite body containing parallel bands of thin amphibolite layers. This evolution occurred during K- and Si-metasomatism that was made possible by strong deformatio ...
... Sudbury, Canada, is shown to be folded into a tight, nearly isoclinal anticline and then to evolve into a layered quartz monzonite-granodiorite body containing parallel bands of thin amphibolite layers. This evolution occurred during K- and Si-metasomatism that was made possible by strong deformatio ...
OKINAWA TROUGH: ORIGIN OF A BACK
... High seismicity is associated with the length of Okinawa Trough and the Ryukyu Arc and Trench (Barazangi and Dorman, 1969). Katsumata and Sykes (1969) demonstrated that the seismic activity is concentrated along a northwestward-dipping plane extending from the region of the Ryukyu Trench beneath the ...
... High seismicity is associated with the length of Okinawa Trough and the Ryukyu Arc and Trench (Barazangi and Dorman, 1969). Katsumata and Sykes (1969) demonstrated that the seismic activity is concentrated along a northwestward-dipping plane extending from the region of the Ryukyu Trench beneath the ...
Peridotite and Metabasic Rocks of the Marianské Lázně
... Institute of Geochemistry, Mineralogy and Mineral Resources, Charles University, Albertov 6, 128 43 Praha, Czech Republic Institute of Petrology and Structural Geology, Charles University, Albertov 6, 128 43 Praha, Czech Republic The Mariánské Lázně Complex (MLC), an eclogite-bearing metaophiolite, ...
... Institute of Geochemistry, Mineralogy and Mineral Resources, Charles University, Albertov 6, 128 43 Praha, Czech Republic Institute of Petrology and Structural Geology, Charles University, Albertov 6, 128 43 Praha, Czech Republic The Mariánské Lázně Complex (MLC), an eclogite-bearing metaophiolite, ...
Earth & Space Science An open source text edited by MPS teachers
... is claimed to be infringing or to be the subject of infringing activity. You must include sufficient information, such as a specific page number or other specific identification, for us to locate the material. 3. Information for us to be able to contact the claimant (e.g., email address, phone numbe ...
... is claimed to be infringing or to be the subject of infringing activity. You must include sufficient information, such as a specific page number or other specific identification, for us to locate the material. 3. Information for us to be able to contact the claimant (e.g., email address, phone numbe ...
the Scanned PDF
... (Wilshire and Binns, 1961). The plagioclaseis probably derived from small amounts of CaSiOa and MgAlzSiO2 originally contained in the bronzite. In such cases,the symplectite showsmore complex texture. Augite forms relatively large anhedral plates up to 2 mm long with graphic intergrowths of spinel. ...
... (Wilshire and Binns, 1961). The plagioclaseis probably derived from small amounts of CaSiOa and MgAlzSiO2 originally contained in the bronzite. In such cases,the symplectite showsmore complex texture. Augite forms relatively large anhedral plates up to 2 mm long with graphic intergrowths of spinel. ...
Origin of carbonatites in the South Qinling orogen:
... Most studies of compositional heterogeneities in the mantle, related to recycling of crustal sediments or delaminated subcontinental lithosphere, come from oceanic setting basalts. In this work, we present direct geochronological and geochemical evidence for the incorporation of recycled crustal mat ...
... Most studies of compositional heterogeneities in the mantle, related to recycling of crustal sediments or delaminated subcontinental lithosphere, come from oceanic setting basalts. In this work, we present direct geochronological and geochemical evidence for the incorporation of recycled crustal mat ...
nature and composition of the continental crust
... of convergent margin where a continent on the subducting plate collides with another on the overriding plate. Convergent margin: the zone where two tectonic plates converge and one is subducted beneath the other. Craton: an area of crust that has remained stable for very long periods of time. Critic ...
... of convergent margin where a continent on the subducting plate collides with another on the overriding plate. Convergent margin: the zone where two tectonic plates converge and one is subducted beneath the other. Craton: an area of crust that has remained stable for very long periods of time. Critic ...
Petroleum Geology and Reservoirs of the Wessex Basin
... They give the impression of lines of relative movement between the intervenig stable regions, and clearly represents a basement influence on the sedimentary layers, probably reactivating earlier features. ...
... They give the impression of lines of relative movement between the intervenig stable regions, and clearly represents a basement influence on the sedimentary layers, probably reactivating earlier features. ...
Chapter 21: Metamorphism
... • Mild deformation, no igneous intrusions discovered • Fine-grained, high-temperature phases, glassy ash: very susceptible to metamorphic alteration • Metamorphic effects attributed to increased temperature and pressure due to burial ...
... • Mild deformation, no igneous intrusions discovered • Fine-grained, high-temperature phases, glassy ash: very susceptible to metamorphic alteration • Metamorphic effects attributed to increased temperature and pressure due to burial ...
Chapter 8 Let`s take it from the top: the crust and upper mantle
... The crust The major divisions of the Earth's interior- crust, mantle and core - have been known from seismology for about 80 years . These are based on the reflection and refi·action of P- and S-waves. The boundary between the crust and mantle is called the Mohorovicic discontinuity (M-discontinuity ...
... The crust The major divisions of the Earth's interior- crust, mantle and core - have been known from seismology for about 80 years . These are based on the reflection and refi·action of P- and S-waves. The boundary between the crust and mantle is called the Mohorovicic discontinuity (M-discontinuity ...
iceland in relation to the mid-atlantic ridge
... with a maximum productivity just south of central Ice land where it may be 4-5 times higher than at the south western and northeastern ends of the zone. ...
... with a maximum productivity just south of central Ice land where it may be 4-5 times higher than at the south western and northeastern ends of the zone. ...
On the tectonic origin of Iberian topography - E
... followed by Neogene rifting on the Mediterranean side) and surface processes acting during the Quaternary. The northern-central part of Iberia (corresponding to the geological units of the Duero Basin, the Iberian Chain, and the Central System) shows a mean elevation close to one thousand meters abo ...
... followed by Neogene rifting on the Mediterranean side) and surface processes acting during the Quaternary. The northern-central part of Iberia (corresponding to the geological units of the Duero Basin, the Iberian Chain, and the Central System) shows a mean elevation close to one thousand meters abo ...
A long in situ section of the lower ocean crust: results of ODP Leg
... at 32³43PS, 57³17³E, is in 11 Ma old crust, about 18 km east of the present-day transform-slip zone and 95 km south of the SW Indian Ridge axis. At the time of accretion, however, it was only about 15 km from the active transform fault as there was subsequent transtensional extension across the tran ...
... at 32³43PS, 57³17³E, is in 11 Ma old crust, about 18 km east of the present-day transform-slip zone and 95 km south of the SW Indian Ridge axis. At the time of accretion, however, it was only about 15 km from the active transform fault as there was subsequent transtensional extension across the tran ...
OROGENIC GOLD FORMATION AND TECTONIC EVOLUTION OF
... xenocrysts and also did not form from an evolving magmatic-hydrothermal system, but are instead formed by orogenic fluids. A second hydrothermal event formed the E-W veins at ~152 Ma, isolated in time from any regional magmatism. In addition to the geochronological research on the ore-hosting grano ...
... xenocrysts and also did not form from an evolving magmatic-hydrothermal system, but are instead formed by orogenic fluids. A second hydrothermal event formed the E-W veins at ~152 Ma, isolated in time from any regional magmatism. In addition to the geochronological research on the ore-hosting grano ...
View - Mid Wales Geology Club
... The Iapetus Ocean lay between Avalonia on one side and Laurentia on the other. As the Iapetus Ocean closed, Avalonia moved towards Laurentia, and after nearly one hundred million years they collided, uniting England & Wales with Scotland along the Solway Firth. Throughout all this time the subsiding ...
... The Iapetus Ocean lay between Avalonia on one side and Laurentia on the other. As the Iapetus Ocean closed, Avalonia moved towards Laurentia, and after nearly one hundred million years they collided, uniting England & Wales with Scotland along the Solway Firth. Throughout all this time the subsiding ...
Yin and yang of continental crust creation and destruction by plate
... Mature continental crust is compositionally layered and can be subdivided into upper continental crust (∼20 km thick) of approximately granodioritic composition and lower, mafic crust (∼20 km thick), separated by a Conrad discontinuity that is well to weakly formed (Christensen and Mooney 1995; Rudn ...
... Mature continental crust is compositionally layered and can be subdivided into upper continental crust (∼20 km thick) of approximately granodioritic composition and lower, mafic crust (∼20 km thick), separated by a Conrad discontinuity that is well to weakly formed (Christensen and Mooney 1995; Rudn ...
Bedrock Geology of the High Peaks Region, Marcy Massif
... 1910 and was partly remapped by Walton in the 1960's, and by oeWaard on Giant Mt. in 1970, and in an area to the east by Gasparik in the 1970's. Why then, remap? Although the rocks have changed but little, new concepts, new techniques, and a plethora of laboratory experimental data unavailable until ...
... 1910 and was partly remapped by Walton in the 1960's, and by oeWaard on Giant Mt. in 1970, and in an area to the east by Gasparik in the 1970's. Why then, remap? Although the rocks have changed but little, new concepts, new techniques, and a plethora of laboratory experimental data unavailable until ...
Perspectives on the origin of plagiogranite in ophiolites from oxygen
... and Coogan, 2002; Stakes and Taylor, 1992). While plagiogranite yields insights into a myriad of processes in modern and ancient settings, their petrogenesis has been the subject of much debate. Most early interpretations of oceanic plagiogranite regarded them as the products of fractional crystalli ...
... and Coogan, 2002; Stakes and Taylor, 1992). While plagiogranite yields insights into a myriad of processes in modern and ancient settings, their petrogenesis has been the subject of much debate. Most early interpretations of oceanic plagiogranite regarded them as the products of fractional crystalli ...
1 MELT VISCOSITY, TEMPERATURE AND TRANSPORT
... Lower Pillow Lavas and the Basal Group. The divisions were based on mineralogy, color (alteration), and the abundance of dikes. An olivine phyric group at the top of the sequence constitutes the Upper Pillow Lavas resting on generally aphyric Lower Pillow Lavas. In the Upper Pillow Lava sequence, di ...
... Lower Pillow Lavas and the Basal Group. The divisions were based on mineralogy, color (alteration), and the abundance of dikes. An olivine phyric group at the top of the sequence constitutes the Upper Pillow Lavas resting on generally aphyric Lower Pillow Lavas. In the Upper Pillow Lava sequence, di ...
Geology of Great Britain
The geology of Great Britain is renowned for its diversity. As a result of its eventful geological history, Great Britain shows a rich variety of landscapes across the constituent countries of England, Wales and Scotland. Rocks of almost all geological ages are represented at outcrop, from the Archaean onwards.