Ghikas et al.IGR2010
... episodes of the break-up of Gondwana and evolved as latitudinal, east –west-oriented basins separated by discrete continental fragments. Most eastern Mediterranean ophiolites are spatially associated with both Triassic –Jurassic volcanic rocks and subophiolitic mélanges that rest tectonically on pa ...
... episodes of the break-up of Gondwana and evolved as latitudinal, east –west-oriented basins separated by discrete continental fragments. Most eastern Mediterranean ophiolites are spatially associated with both Triassic –Jurassic volcanic rocks and subophiolitic mélanges that rest tectonically on pa ...
Earth`s first two billion years—The era of internally
... plate tectonics, so the process is not inevitable throughout the history of a terrestrial planet. Rocks older than ca. 2.5 Ga are exposed in least-modified form on about 35 large and small “cratons” (Bleeker, 2003), and also as large and small reworked complexes in, mostly, Paleoproterozoic orogenic ...
... plate tectonics, so the process is not inevitable throughout the history of a terrestrial planet. Rocks older than ca. 2.5 Ga are exposed in least-modified form on about 35 large and small “cratons” (Bleeker, 2003), and also as large and small reworked complexes in, mostly, Paleoproterozoic orogenic ...
Fulltext - ETH E-Collection
... The Apuseni-Banat-Timok-Srednogorie (ABTS) magmatic arc in southeastern Europe formed as a result of NE-dipping subduction of the Neotethys ocean beneath the European continental margin during the Late Cretaceous. This magmatic arc is associated with some of Europe’s largest porphyry Cu-Au and epith ...
... The Apuseni-Banat-Timok-Srednogorie (ABTS) magmatic arc in southeastern Europe formed as a result of NE-dipping subduction of the Neotethys ocean beneath the European continental margin during the Late Cretaceous. This magmatic arc is associated with some of Europe’s largest porphyry Cu-Au and epith ...
Email addresses
... the petrologic and geochemical composition, rheological state, thermal evolution of the lithosphere. These xenoliths, fragments of wall rocks entrained by magmas at upper mantle and lower crustal levels, have been carried to the surface by alkaline basalts extreme rapidly, probably in less then 60 h ...
... the petrologic and geochemical composition, rheological state, thermal evolution of the lithosphere. These xenoliths, fragments of wall rocks entrained by magmas at upper mantle and lower crustal levels, have been carried to the surface by alkaline basalts extreme rapidly, probably in less then 60 h ...
garwin_et_al_2005 Au-Cu Cenozoic magmatic arcs SE Asia
... forearc islands, an active volcanic belt, and the Okinawa trough in the backarc. The Ryukyu arc is related to westward subduction of the Philippine Sea plate beneath the Eurasian plate at a velocity of 6 to 7 cm/yr (Shinjo, 1999). The basement rocks consist of Permian to Cretaceous sedimentary or se ...
... forearc islands, an active volcanic belt, and the Okinawa trough in the backarc. The Ryukyu arc is related to westward subduction of the Philippine Sea plate beneath the Eurasian plate at a velocity of 6 to 7 cm/yr (Shinjo, 1999). The basement rocks consist of Permian to Cretaceous sedimentary or se ...
Time-Space Development of an External Brine
... 1994). Fe oxide-rich deposits occur with igneous rocks that range from mafic to felsic (Barton and Johnson, 1996). In this and other respects, they contrast to many other kinds of igneous-related mineral deposits which occur with narrow ranges of igneous compositions. Alkali-dominated hydrothermal a ...
... 1994). Fe oxide-rich deposits occur with igneous rocks that range from mafic to felsic (Barton and Johnson, 1996). In this and other respects, they contrast to many other kinds of igneous-related mineral deposits which occur with narrow ranges of igneous compositions. Alkali-dominated hydrothermal a ...
101 - Durham University Community
... facts as their meanings are often interpreted by observers. The most common problem that many of us face is the scenario that we may imperceptibly treat some authority interpretations as facts or as being correct without questioning. This is unhealthy and inhibits the advance of our science. What is ...
... facts as their meanings are often interpreted by observers. The most common problem that many of us face is the scenario that we may imperceptibly treat some authority interpretations as facts or as being correct without questioning. This is unhealthy and inhibits the advance of our science. What is ...
GEOLOGY OF PRE-MESOZOIC BEDROCK OF THE AMHERST
... Connecticut Valley border fault and on the west by an unconformity in 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 ...
... Connecticut Valley border fault and on the west by an unconformity in 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 ...
GEOLOGY, ORE DEPOSITS, AND MINERAL POTENTIAL OF THE
... Lost River tin-tungsten-fluorite-beryllium deposits, and later in the reconnaissance geologic mapping of the remainder of the Seward Peninsula. During the earlier studies, which were coordinated with field investigations of the U.S. Bureau of Mines at Lost River, large new deposits of fluorite conta ...
... Lost River tin-tungsten-fluorite-beryllium deposits, and later in the reconnaissance geologic mapping of the remainder of the Seward Peninsula. During the earlier studies, which were coordinated with field investigations of the U.S. Bureau of Mines at Lost River, large new deposits of fluorite conta ...
Origin of Mesoproterozoic A-type granites in Laurentia
... compositions reflect the relative contributions of mantle and crustal sources in their genesis. In Laurentia, a distinctive belt of Mesoproterozoic A-type or “anorogenic” granites of ∼ 1.4 Ga age was emplaced within composite, heterogeneous Proterozoic crust. Zircons are an ideal mineral to constrai ...
... compositions reflect the relative contributions of mantle and crustal sources in their genesis. In Laurentia, a distinctive belt of Mesoproterozoic A-type or “anorogenic” granites of ∼ 1.4 Ga age was emplaced within composite, heterogeneous Proterozoic crust. Zircons are an ideal mineral to constrai ...
McLelland, JM, Selleck, BW, and Bickford, ME, 2010
... ca. 1050 Ma, followed by orogen collapse at ca. 1020 Ma. A final contractional pulse (ca. 1010–980 Ma) ending with extensional collapse gave rise to the Grenville Front thrust. The Allochthonous Monocyclic Belt consists of rocks younger than ca. 1.35 Ga. Details of these belts and the orogenic seque ...
... ca. 1050 Ma, followed by orogen collapse at ca. 1020 Ma. A final contractional pulse (ca. 1010–980 Ma) ending with extensional collapse gave rise to the Grenville Front thrust. The Allochthonous Monocyclic Belt consists of rocks younger than ca. 1.35 Ga. Details of these belts and the orogenic seque ...
投影片 1
... Nature of sulphide bodies MVT deposits occur in clusters of a few to hundreds of individual ore bodies that vary in character and shape and are often interconnected (Fig. 6). Deposits and ore bodies range from massive replacement zones to open-space fillings of breccias and fractures, to disseminat ...
... Nature of sulphide bodies MVT deposits occur in clusters of a few to hundreds of individual ore bodies that vary in character and shape and are often interconnected (Fig. 6). Deposits and ore bodies range from massive replacement zones to open-space fillings of breccias and fractures, to disseminat ...
constraints, geotectonic setting and basin development Saxo
... Bohemian Massif (Fig. 1). To the north, the Saxo-Thuringian Zone is separated by the MidGerman Crystalline Zone from the RhenoHercynian Zone (Fig. 2). The bounding element to the SW is the Franconian Line, which is a relatively young fault system originated during Mesozoic to Cenozoic reactivation o ...
... Bohemian Massif (Fig. 1). To the north, the Saxo-Thuringian Zone is separated by the MidGerman Crystalline Zone from the RhenoHercynian Zone (Fig. 2). The bounding element to the SW is the Franconian Line, which is a relatively young fault system originated during Mesozoic to Cenozoic reactivation o ...
Magmatic growth and batholithic root development in the northern
... (1978) and Kistler (1990). Belts of metamorphic rocks in the northern Sierra foothills have been grouped according to the two different interpreted lithosphere types (Panthalassan and North American) of Kistler (1990). The western extent of the Great Valley is based on the presence of tonalitic and ...
... (1978) and Kistler (1990). Belts of metamorphic rocks in the northern Sierra foothills have been grouped according to the two different interpreted lithosphere types (Panthalassan and North American) of Kistler (1990). The western extent of the Great Valley is based on the presence of tonalitic and ...
Title K-feldspar sand-grain provenance in the Triassic
... some of the mixing or ‘averaging’ issues associated with analysis of bulk samples. 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 recy ...
... some of the mixing or ‘averaging’ issues associated with analysis of bulk samples. 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 recy ...
Oxygen and hydrogen isotope compositions of oceanic plutonic rocks
... between extensional veins oriented perpendicular to the metamorphic foliation and intensity of deformation. The veins related to deformation are either hornblende-bearing or hornblende- and sodic plagioclase-bearing, and are the most abundant vein type in the upper 250 m of core. Similar amphibole v ...
... between extensional veins oriented perpendicular to the metamorphic foliation and intensity of deformation. The veins related to deformation are either hornblende-bearing or hornblende- and sodic plagioclase-bearing, and are the most abundant vein type in the upper 250 m of core. Similar amphibole v ...
Delaware Piedmont Geology - The Delaware Geological Survey
... Valley and the geologic history of the Delaware Piedmont. It has been written for those who would like to know more about rocks, for students and teachers of earth science who would like to know more about Piedmont rocks and what they look like outside the classroom, and for geologists who may be fa ...
... Valley and the geologic history of the Delaware Piedmont. It has been written for those who would like to know more about rocks, for students and teachers of earth science who would like to know more about Piedmont rocks and what they look like outside the classroom, and for geologists who may be fa ...
e@ntlr rnrrul ll ng €dJuJeortttt ornr
... If so, we can therr seek these conditions in the geologic record of sedimentary basins. PLATE INIEMCTIO}'IS are spherical caps, or arcuat.e slabs, The plates of plate tectonics of the earthts lithosphere which is thicker or tectosphere, than Ehe crusL as defined by M and extends dor.m to the so-call ...
... If so, we can therr seek these conditions in the geologic record of sedimentary basins. PLATE INIEMCTIO}'IS are spherical caps, or arcuat.e slabs, The plates of plate tectonics of the earthts lithosphere which is thicker or tectosphere, than Ehe crusL as defined by M and extends dor.m to the so-call ...
International Conference and Anniversary Post
... February, 2006 at the Faculty of Geology, Moscow State University and at “Solnechnaia Poliana” Resort Hotel (ca. 50 km from Moscow). It was hosted by Moscow State University (MSU). The Training-through-Research (TTR) Programme, designed in 1990 by an international group of scientists under the auspi ...
... February, 2006 at the Faculty of Geology, Moscow State University and at “Solnechnaia Poliana” Resort Hotel (ca. 50 km from Moscow). It was hosted by Moscow State University (MSU). The Training-through-Research (TTR) Programme, designed in 1990 by an international group of scientists under the auspi ...
Barrovian metamorphism in the central Kootenay Arc, British
... Abstract: A narrow, partly fault-bounded belt of Barrovian amphibolite facies rocks transects the central Kootenay Arc in the internal zone of the southeastern Canadian Cordillera. The following zones of increasing metamorphic grade are recognised in metapelites: chlorite/biotite, garnet, staurolite ...
... Abstract: A narrow, partly fault-bounded belt of Barrovian amphibolite facies rocks transects the central Kootenay Arc in the internal zone of the southeastern Canadian Cordillera. The following zones of increasing metamorphic grade are recognised in metapelites: chlorite/biotite, garnet, staurolite ...
Sedimentary record of the tectonic growth of a collisional continental
... similar tectonic setting, a series of sedimentary basins are forming near Papua New Guinea as a result of the collision of the Bismarck volcanic arc with the northeastern continental margin of Australia (Silver et al., 1991; Cullen, 1996; Galewsky and Silver, 1997). Ancient examples of collisional b ...
... similar tectonic setting, a series of sedimentary basins are forming near Papua New Guinea as a result of the collision of the Bismarck volcanic arc with the northeastern continental margin of Australia (Silver et al., 1991; Cullen, 1996; Galewsky and Silver, 1997). Ancient examples of collisional b ...
Snoke and Barnes, 2006
... Oregon is a classic example of a mountain belt that developed by the tectonic accretion of rock assemblages of oceanic affinity during progressive crustal growth along an active continental margin. Consequently, the Klamath Mountains province has served as an important model for the definition and a ...
... Oregon is a classic example of a mountain belt that developed by the tectonic accretion of rock assemblages of oceanic affinity during progressive crustal growth along an active continental margin. Consequently, the Klamath Mountains province has served as an important model for the definition and a ...
Geological history of Earth
The geological history of Earth follows the major events in Earth's past based on the geologic time scale, a system of chronological measurement based on the study of the planet's rock layers (stratigraphy). Earth formed about 4.54 billion years ago by accretion from the solar nebula, a disk-shaped mass of dust and gas left over from the formation of the Sun, which also created the rest of the Solar System.Earth was initially molten due to extreme volcanism and frequent collisions with other bodies. Eventually, the outer layer of the planet cooled to form a solid crust when water began accumulating in the atmosphere. The Moon formed soon afterwards, possibly as the result of a Mars-sized object with about 10% of the Earth's mass impacting the planet in a glancing blow. Some of this object's mass merged with the Earth, significantly altering its internal composition, and a portion was ejected into space. Some of the material survived to form an orbiting moon. Outgassing and volcanic activity produced the primordial atmosphere. Condensing water vapor, augmented by ice delivered from comets, produced the oceans.As the surface continually reshaped itself over hundreds of millions of years, continents formed and broke apart. They migrated across the surface, occasionally combining to form a supercontinent. Roughly 750 million years ago, the earliest-known supercontinent Rodinia, began to break apart. The continents later recombined to form Pannotia, 600 to 540 million years ago, then finally Pangaea, which broke apart 180 million years ago.The present pattern of ice ages began about 40 million years ago, then intensified at the end of the Pliocene. The polar regions have since undergone repeated cycles of glaciation and thaw, repeating every 40,000–100,000 years. The last glacial period of the current ice age ended about 10,000 years ago.