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... represent a forearc and backarc basin sequence, respectively. These inferences are most simply resolved with a tectonic model whereby the intra-oceanic Kohistan arc evolved over a south-dipping subduction zone, implying that Kohistan and India moved northwards on the same plate, although separated, ...
... represent a forearc and backarc basin sequence, respectively. These inferences are most simply resolved with a tectonic model whereby the intra-oceanic Kohistan arc evolved over a south-dipping subduction zone, implying that Kohistan and India moved northwards on the same plate, although separated, ...
Dynamics of continental collision: influence of the plate contact
... upper-mantle structure and tectonic deformation in many regions, for example, the Mediterranean–Carpathian region, the New Hebrides and Turkey (Chatelain et al. 1992; Wortel & Spakman 1992, 2000; Parlak et al. 2006; Lei & Zhao 2007). Understanding the factors controlling the three different modes of ...
... upper-mantle structure and tectonic deformation in many regions, for example, the Mediterranean–Carpathian region, the New Hebrides and Turkey (Chatelain et al. 1992; Wortel & Spakman 1992, 2000; Parlak et al. 2006; Lei & Zhao 2007). Understanding the factors controlling the three different modes of ...
OVERVIEW Tectonics of the Himalaya and southern Tibet from two
... Gansser, 1939; Wadia, 1939); the application of these tectonostratigraphic divisions to other parts of the Himalaya is not entirely without controversy (Yeats and Lawrence, 1984; Pogue et al., 1999). Transhimalayan Zone Prior to its collision with India, the southern margin of Eurasia was marked by ...
... Gansser, 1939; Wadia, 1939); the application of these tectonostratigraphic divisions to other parts of the Himalaya is not entirely without controversy (Yeats and Lawrence, 1984; Pogue et al., 1999). Transhimalayan Zone Prior to its collision with India, the southern margin of Eurasia was marked by ...
Igneous Rocks and Intrusive Igneous Activity
... Olivine, for example, might have a rim of pyroxene, indicating an incomplete reaction. If magma cools rapidly enough, the early-formed minerals do not have time to react with the melt, and thus all the ferromagnesian silicates in the discontinuous branch can be in one rock. In any case, by the time ...
... Olivine, for example, might have a rim of pyroxene, indicating an incomplete reaction. If magma cools rapidly enough, the early-formed minerals do not have time to react with the melt, and thus all the ferromagnesian silicates in the discontinuous branch can be in one rock. In any case, by the time ...
alleghanian plutonism in the eastern blue ridge
... Alleghanian progressed from southeast to northwest as Gondwana collided with the eastern margin of Laurentia (Hatcher 2002). An alternative model is that the Alleghanian plutons formed during subduction of Theic oceanic lithosphere prior to the Gondwanan collision (Sinha and Zietz 1982, Stahr 2008) ...
... Alleghanian progressed from southeast to northwest as Gondwana collided with the eastern margin of Laurentia (Hatcher 2002). An alternative model is that the Alleghanian plutons formed during subduction of Theic oceanic lithosphere prior to the Gondwanan collision (Sinha and Zietz 1982, Stahr 2008) ...
the orivesi granite batholith, southern central finland
... The Orivesi granite batholith has intruded along regional shear zones in the southern part of the CFGC. The intrusion was diapiric at least during the final emplacement, and produced the magmatic structures in the batholith. Regional deformation has affected the batholith only as semi-brittle moveme ...
... The Orivesi granite batholith has intruded along regional shear zones in the southern part of the CFGC. The intrusion was diapiric at least during the final emplacement, and produced the magmatic structures in the batholith. Regional deformation has affected the batholith only as semi-brittle moveme ...
The Ingalls ophiolite complex, central Cascades, Washington
... one of several Middle to Late Jurassic ophiolites of the North American Cordillera. It consists primarily of mantle tectonites. High-temperature mylonitic peridotite, overprinted by serpentinite mélange (Navaho Divide fault zone), separates harzburgite and dunite in the south from lherzolite in the ...
... one of several Middle to Late Jurassic ophiolites of the North American Cordillera. It consists primarily of mantle tectonites. High-temperature mylonitic peridotite, overprinted by serpentinite mélange (Navaho Divide fault zone), separates harzburgite and dunite in the south from lherzolite in the ...
T.Y.B.Sc. Geology
... g) Rupture strength, Ultimate strength & Fundamental strength. h) Factors controlling rock deformation: Confining pressure, temperature, time, solution, anisotropy & inhomogenity of rocks. i) Rheology (definition & concept). C) Mechanics of Plastic deformation: (3 Lectures) a) Definition & examples ...
... g) Rupture strength, Ultimate strength & Fundamental strength. h) Factors controlling rock deformation: Confining pressure, temperature, time, solution, anisotropy & inhomogenity of rocks. i) Rheology (definition & concept). C) Mechanics of Plastic deformation: (3 Lectures) a) Definition & examples ...
An integrated geophysical analysis of the upper crust of the southern
... is sometimes associated with volcanoes, which produce local maxima. He also showed that a minor densification of the basement by dyke injection could explain much of the axial high. The KRISP 90 and 94 results were not available at the time he did his analysis, and he did not have access to the new ...
... is sometimes associated with volcanoes, which produce local maxima. He also showed that a minor densification of the basement by dyke injection could explain much of the axial high. The KRISP 90 and 94 results were not available at the time he did his analysis, and he did not have access to the new ...
Petrology, mineralogy, and origin of the Feragen ultramafic body
... The chromites have a large compositional range. In the chromites a rare Ni-Fe alloy awaruite (josephinite) is present that is generally regarded as being secondary. The textures and mineralogy of the rocks are interpreted, indicating that the Feragen ultramafic body has been formed by cumulate proce ...
... The chromites have a large compositional range. In the chromites a rare Ni-Fe alloy awaruite (josephinite) is present that is generally regarded as being secondary. The textures and mineralogy of the rocks are interpreted, indicating that the Feragen ultramafic body has been formed by cumulate proce ...
New Hypothesis for the Formation of the Catalina
... 1999) this cannot explain how high-pressure/temperature rocks of the Catalina Schist were juxtaposed beneath the western margin of the Peninsular Ranges batholith. As is outlined in this paper, we believe that the juxtaposition originated during medial Cretaceous subduction erosion. A long-standing ...
... 1999) this cannot explain how high-pressure/temperature rocks of the Catalina Schist were juxtaposed beneath the western margin of the Peninsular Ranges batholith. As is outlined in this paper, we believe that the juxtaposition originated during medial Cretaceous subduction erosion. A long-standing ...
The Asia–Kohistan–India Collision: Review and Discussion
... hanging plate. Blue lines extensional sites with barbed lines in ...
... hanging plate. Blue lines extensional sites with barbed lines in ...
Rhenium–osmium isotope and elemental behaviour during
... and 550–600 °C [11,12]. More recently it has been suggested that peak metamorphic pressures for the Allalin Gabbro may have reached 3.5 GPa [13]. The ‘peak’ of metamorphism in the ZSO is thought to have occurred at 40.6 ± 2.6 Ma from a Sm–Nd mineral isochron for a metabasite in the Lago di Cignana a ...
... and 550–600 °C [11,12]. More recently it has been suggested that peak metamorphic pressures for the Allalin Gabbro may have reached 3.5 GPa [13]. The ‘peak’ of metamorphism in the ZSO is thought to have occurred at 40.6 ± 2.6 Ma from a Sm–Nd mineral isochron for a metabasite in the Lago di Cignana a ...
Variations in magmatic processes along the East Greenland
... Müller (1994) suggested that the mantle plume was located beneath central Greenland in Late Cretaceous/Early Tertiary times (Fig. 1). Thus, the Tertiary volcanism of the North Atlantic margins prior to and during break-up is associated with mantle plume activity within a circle of radius of more th ...
... Müller (1994) suggested that the mantle plume was located beneath central Greenland in Late Cretaceous/Early Tertiary times (Fig. 1). Thus, the Tertiary volcanism of the North Atlantic margins prior to and during break-up is associated with mantle plume activity within a circle of radius of more th ...
Geologic history of Siletzia, a large igneous province in the Oregon
... zones, and magnetic polarities allow correlation of the volcanics with the 2012 geologic time scale. The data show that Siletzia was rapidly erupted 56–49 Ma, during the Chron 25–22 plate reorganization in the northeast Pacific basin. Accretion was completed between 51 and 49 Ma in Oregon, based on ...
... zones, and magnetic polarities allow correlation of the volcanics with the 2012 geologic time scale. The data show that Siletzia was rapidly erupted 56–49 Ma, during the Chron 25–22 plate reorganization in the northeast Pacific basin. Accretion was completed between 51 and 49 Ma in Oregon, based on ...
nature and composition of the continental crust
... Amphibolite facies: the set of metamorphic mineral assemblages in which mafic rocks are composed of amphibole and plagioclase. The facies is typical of regional metamorphism at moderate to high pressures and temperatures (i.e., >300 MPa, 450°-700°C). Anisotropy: see seismic anisotropy. Anorthosite: ...
... Amphibolite facies: the set of metamorphic mineral assemblages in which mafic rocks are composed of amphibole and plagioclase. The facies is typical of regional metamorphism at moderate to high pressures and temperatures (i.e., >300 MPa, 450°-700°C). Anisotropy: see seismic anisotropy. Anorthosite: ...
54. mesozoic-tertiary tectonic evolution of the easternmost
... 1995). 13. Antalya “Nappes” are grossly allochthonous and thrust from the north from a single Neotethyan ocean located in central and northern Turkey (Marcoux et al., 1989). 14. The Antalya Complex rifted to form a small ocean basin only in the Cretaceous, rather than the Triassic? (Dilek and Rowlan ...
... 1995). 13. Antalya “Nappes” are grossly allochthonous and thrust from the north from a single Neotethyan ocean located in central and northern Turkey (Marcoux et al., 1989). 14. The Antalya Complex rifted to form a small ocean basin only in the Cretaceous, rather than the Triassic? (Dilek and Rowlan ...
- Wiley Online Library
... [2] Whether or not a large amount of magmatic activity occurs during rifting has led to two separate classes of rifted passive margins: volcanic or nonvolcanic margins. Volcanic margins are commonly associated with high thermal anomalies in the mantle, which are often due to mantle plumes like the A ...
... [2] Whether or not a large amount of magmatic activity occurs during rifting has led to two separate classes of rifted passive margins: volcanic or nonvolcanic margins. Volcanic margins are commonly associated with high thermal anomalies in the mantle, which are often due to mantle plumes like the A ...
The Indonesian Sedimentologists Forum (FOSI)
... (1979) described the topography, structural elements, crustal composition and seismicity of the entire arc system. He also interpreted subducting lithosphere around the Banda arc as a continuous and gravitation-controlled downgoing slab. Hamilton (1979) is one of the earliest publications on the tec ...
... (1979) described the topography, structural elements, crustal composition and seismicity of the entire arc system. He also interpreted subducting lithosphere around the Banda arc as a continuous and gravitation-controlled downgoing slab. Hamilton (1979) is one of the earliest publications on the tec ...
Fe-Ti oxidesilicate equilibria: Assemblages with fayalitic olivine
... ilmenite". * quartz) all give the same/o, at the temperature indicated by the oxides. Activities of FerO, in ilmenite and of Fe.Oo in titanomagnetite are calculated from the solution models of Andersen and Lindsley (1988).QUIIF must becomeasymptoticto the FMQ buF er at low temperatureswhere magnetit ...
... ilmenite". * quartz) all give the same/o, at the temperature indicated by the oxides. Activities of FerO, in ilmenite and of Fe.Oo in titanomagnetite are calculated from the solution models of Andersen and Lindsley (1988).QUIIF must becomeasymptoticto the FMQ buF er at low temperatureswhere magnetit ...
Geology and petrology of the felsic intrusions in the
... Furthermore I also want to thank Professor Fernandez-Alonso, head of the geology department at the RMCA, for the collaboration with Ghent University. Together with Luc André, I want to thank him for the approval and financial contribution of the geochemical analyses. These analyses were carried out ...
... Furthermore I also want to thank Professor Fernandez-Alonso, head of the geology department at the RMCA, for the collaboration with Ghent University. Together with Luc André, I want to thank him for the approval and financial contribution of the geochemical analyses. These analyses were carried out ...
Petrology and structure of syenite intrusions of the Okenyenya
... Petrology and structure of syenite intrusions of Okenyenya present level of exposure. The dyke is well developed around the WSW margin of the complex, where it attains a maximum thickness of some 75 m (Fig. 2) and comprises dominantly syenite of similar appearance to the “ridge syenite” described b ...
... Petrology and structure of syenite intrusions of Okenyenya present level of exposure. The dyke is well developed around the WSW margin of the complex, where it attains a maximum thickness of some 75 m (Fig. 2) and comprises dominantly syenite of similar appearance to the “ridge syenite” described b ...
Geology and geochronology of mineral deposits in the Biga
... 2. Geologic and tectonic setting Biga Peninsula constitutes the northwestern tip of the Turkish Peninsula (Fig. 1), tectonically forming the westernmost part of the Sakarya Zone of the Pontides at the intersection of Gondwana and Laurasia. Thus it illustrates much of the complicated geologic and tec ...
... 2. Geologic and tectonic setting Biga Peninsula constitutes the northwestern tip of the Turkish Peninsula (Fig. 1), tectonically forming the westernmost part of the Sakarya Zone of the Pontides at the intersection of Gondwana and Laurasia. Thus it illustrates much of the complicated geologic and tec ...
Lab Manual - Canvas @ WWU
... In contrast, plate tectonics is a more recent theory that describes how the continents have moved. The plate tectonics theory is one of the most important and far-reaching theories in geology. It is based on an investigation of the sea floor using technology that was not available until the 1960’s t ...
... In contrast, plate tectonics is a more recent theory that describes how the continents have moved. The plate tectonics theory is one of the most important and far-reaching theories in geology. It is based on an investigation of the sea floor using technology that was not available until the 1960’s t ...
Download/View - ALQ Gold Corporation
... Exploration work in 2011 included an airborne ZTEM survey completed by Geotech Ltd. and a ground follow up program which included geologic mapping, prospecting, and soil sampling. This work outlined and confirmed seven unexplored multi-element (Cu±Zn±Pb±Au±Ag) soil geochemical anomalies and one sign ...
... Exploration work in 2011 included an airborne ZTEM survey completed by Geotech Ltd. and a ground follow up program which included geologic mapping, prospecting, and soil sampling. This work outlined and confirmed seven unexplored multi-element (Cu±Zn±Pb±Au±Ag) soil geochemical anomalies and one sign ...
Great Lakes tectonic zone
The Great Lakes tectonic zone is bounded by South Dakota at its tip and heads northeast to south of Duluth, Minnesota, then heads east through northern Wisconsin, Marquette, Michigan, and then trends more northeasterly to skim the northern-most shores of lakes Michigan and Huron before ending in the Sudbury, Ontario, Canada, area.During the Late Archean Era the Algoman orogeny added landmass to the Superior province by volcanic activity and continental collision along a boundary that stretches from present-day South Dakota, U.S., into the Lake Huron region near Sudbury, Ontario, Canada.This crustal boundary is the Great Lakes tectonic zone. It is 1,400 km (870 mi) long, and separates the older Archean gneissic terrane to the south from younger Late Archean greenstone-granite terrane to the north.The zone is characterized by active compression during the Algoman orogeny (about 2,700 million years ago), a pulling-apart (extensional) tectonics (2,450 to 2,100 million years ago), a second compression during the Penokean orogeny (1,900 to 1,850 million years ago), a second extension during Middle Proterozoic time (1,600 million years ago) and minor reactivation during Phanerozoic time (the past 500 million years).Collision began along the Great Lakes tectonic zone (GLTZ) with the Algoman mountain-building event and continued for tens of millions of years. During the formation of the GLTZ, the gneissic Minnesota River Valley subprovince was thrust up onto the Superior province's edge as it consumed the Superior province's oceanic crust. Fragmentation of the Kenorland supercontinent began 2,450 million years ago and was completed by 2,100 million years ago. The Wyoming province is the continental landmass that is hypothesized to have rifted away from the southern Superior province portion of Kenorland, before moving rapidly west and docking with the Laurentia supercontinent 1,850 to 1,715 million years ago. Sedimentation from the GLTZ-rifting environment continued into the Penokean orogeny, which is the next major tectonic event in the Great Lakes region. Several earthquakes have been documented in Minnesota, Michigan's Upper Peninsula and Sudbury in the last 120 years along the GLTZ.