Paleogene–early Miocene igneous rocks and geodynamics of the
... Paleogene turbiditic succession; a Senonian and Paleogene igneous complex with intrusives and effusives; and finally the metamorphosed parts of the turbidite complex. Metamorphism of the turbidite sequence appears to be related to both burial and to contact metamorphism by the intrusive bodies (Fig. ...
... Paleogene turbiditic succession; a Senonian and Paleogene igneous complex with intrusives and effusives; and finally the metamorphosed parts of the turbidite complex. Metamorphism of the turbidite sequence appears to be related to both burial and to contact metamorphism by the intrusive bodies (Fig. ...
The Laramide Orogeny: What Were the Driving Forces?
... Laramide time remains a matter of much debate (e.g., Breitsprecher et al., 2003). It is, therefore, likely that the age of the subducting slab varied significantly along strike. The convergence rate is estimated to have been high during Laramide time (average trench-normal component of 10–15 cm/yr f ...
... Laramide time remains a matter of much debate (e.g., Breitsprecher et al., 2003). It is, therefore, likely that the age of the subducting slab varied significantly along strike. The convergence rate is estimated to have been high during Laramide time (average trench-normal component of 10–15 cm/yr f ...
The Laramide Orogeny - University of Nevada, Reno
... Laramide time remains a matter of much debate (e.g., Breitsprecher et al., 2003). It is, therefore, likely that the age of the subducting slab varied significantly along strike. The convergence rate is estimated to have been high during Laramide time (average trench-normal component of 10–15 cm/yr f ...
... Laramide time remains a matter of much debate (e.g., Breitsprecher et al., 2003). It is, therefore, likely that the age of the subducting slab varied significantly along strike. The convergence rate is estimated to have been high during Laramide time (average trench-normal component of 10–15 cm/yr f ...
PDF
... The Neoproterozic Allaqi–Heiani suture in southeastern Egypt is the western extension of the Allaqi–Heiani–Onib–Sol Hamed–Yanbu suture that represents one of arc–arc sutures in the Arabian–Nubian Shield. It extends for more than 250 km from the N-trending Hamisana Shear Zone in the east to Lake Nass ...
... The Neoproterozic Allaqi–Heiani suture in southeastern Egypt is the western extension of the Allaqi–Heiani–Onib–Sol Hamed–Yanbu suture that represents one of arc–arc sutures in the Arabian–Nubian Shield. It extends for more than 250 km from the N-trending Hamisana Shear Zone in the east to Lake Nass ...
Meddelelser fra Dansk Geologisk Forening, vol. 17/4, pp. 504-516
... the depth of exposure is probably somewhat greater and may be estimated at up to 20 km. These depths lead us to another feature; the amount and rate of uplift. These have apparently been rather small. In some areas postCarboniferous uplift has amounted to not more than a few kilometres. In other are ...
... the depth of exposure is probably somewhat greater and may be estimated at up to 20 km. These depths lead us to another feature; the amount and rate of uplift. These have apparently been rather small. In some areas postCarboniferous uplift has amounted to not more than a few kilometres. In other are ...
Convergent Tectonics and Coastal Upwelling: A History of
... and Pacific plates. As the Andes were built, the changing shape of the land was accompanied by morphological changes of similar magnitude beneath the sea. Convergent margin processes, whereby thousands of kilometres of oceanic crust were subducted, have resulted in a great change in the morphology o ...
... and Pacific plates. As the Andes were built, the changing shape of the land was accompanied by morphological changes of similar magnitude beneath the sea. Convergent margin processes, whereby thousands of kilometres of oceanic crust were subducted, have resulted in a great change in the morphology o ...
Evolutionary cycles during the Andean orogeny
... herein represents the base for the modern Andean evolution, and it is stressed that its tectonomagmatic and geochemical features are integral parts of repeated evolutionary patterns affecting the entire north Chilean Andean orogeny (200 Ma–Present). Like the present subhorizontal subduction segments ...
... herein represents the base for the modern Andean evolution, and it is stressed that its tectonomagmatic and geochemical features are integral parts of repeated evolutionary patterns affecting the entire north Chilean Andean orogeny (200 Ma–Present). Like the present subhorizontal subduction segments ...
Geologic Map of the Lucile Quadrangle, Idaho County, Idaho: DWM
... flows and volcaniclastic rocks of the Seven Devils Group in the west from strongly deformed volcaniclastic rocks of the western Salmon River belt (Gray and Oldow, 2005). In the Lucile quadrangle exposures are poor, but the brittle-ductile fault appears to place less deformed greenstone (TRPvg) again ...
... flows and volcaniclastic rocks of the Seven Devils Group in the west from strongly deformed volcaniclastic rocks of the western Salmon River belt (Gray and Oldow, 2005). In the Lucile quadrangle exposures are poor, but the brittle-ductile fault appears to place less deformed greenstone (TRPvg) again ...
Birth and Development of Continental Margin Basins
... A schematic geological transect across the central Red Sea (Figure 8) was prepared based on the integration of potential field, seismic refraction and reflection data (eg. Egloff et al., 1991), and further constrained by geological information from exploratory wells (Hughes and Johnson, 2005). This ...
... A schematic geological transect across the central Red Sea (Figure 8) was prepared based on the integration of potential field, seismic refraction and reflection data (eg. Egloff et al., 1991), and further constrained by geological information from exploratory wells (Hughes and Johnson, 2005). This ...
1 The scope of metamorphic Geology
... 2 Progressive metamorphism: the e ect of bulk composition The bulk composition of the rock is of paramount importance to the mineralogical reaction history during metamorphism. Some bulk compositions are essentially unreactive because the minerals they develop have very large PT stability ranges. Fo ...
... 2 Progressive metamorphism: the e ect of bulk composition The bulk composition of the rock is of paramount importance to the mineralogical reaction history during metamorphism. Some bulk compositions are essentially unreactive because the minerals they develop have very large PT stability ranges. Fo ...
Manganese Nodules: Research Data and
... structure and constitute a reference collection at Washington State University (Pullman, Washington), available to other workers. This volume constitutes a reference essential to those working on manganese nodules. Manganese nodules not only exhibit variation in their internal composition and struct ...
... structure and constitute a reference collection at Washington State University (Pullman, Washington), available to other workers. This volume constitutes a reference essential to those working on manganese nodules. Manganese nodules not only exhibit variation in their internal composition and struct ...
Divergent Plate Boundaries - North Coast Distance Education
... melting of the mantle. The magma then collects into elongate chambers beneath the ridge, and some is intruded as dikes or extruded along the rift zone. Seawater is heated as it circulates through the hot crust and causes extensive metamorphism. Locally, the hydrothermal fluids produce hot springs on ...
... melting of the mantle. The magma then collects into elongate chambers beneath the ridge, and some is intruded as dikes or extruded along the rift zone. Seawater is heated as it circulates through the hot crust and causes extensive metamorphism. Locally, the hydrothermal fluids produce hot springs on ...
ppt
... A FEW BROAD GENERALIZATIONS ABOUT GRANITES 1) Most granitoids of significant volume occur in areas where the continental crust has been thickened by orogeny, either continental arc subduction or collision of sialic masses. Many granites, however, may post-date the thickening event by tens of millio ...
... A FEW BROAD GENERALIZATIONS ABOUT GRANITES 1) Most granitoids of significant volume occur in areas where the continental crust has been thickened by orogeny, either continental arc subduction or collision of sialic masses. Many granites, however, may post-date the thickening event by tens of millio ...
NJDEP - NJGWS - GMS 15-2, Bedrock Geologic Map of the High
... Mesoproterozoic rocks in both the footwall and hanging wall. Good exposures of this fault are visible along Spruce Run at Red Mill. The fault displays brittle deformation along its entire length. It bifurcates north of Bells Crossing: its the southern segment is cut off on the east by the Longwood V ...
... Mesoproterozoic rocks in both the footwall and hanging wall. Good exposures of this fault are visible along Spruce Run at Red Mill. The fault displays brittle deformation along its entire length. It bifurcates north of Bells Crossing: its the southern segment is cut off on the east by the Longwood V ...
Physical Processes Along Internal Boundaries In An Con
... our intial fabric study revealed flat to moderately dipping magmatic fabrics, which may reflect the tabular shape of this body. In the Votice area, durbachites also occur as moderately dipping sheet-like bodies displaying highly localized sub-solidus deformation and S-side-up kinematics resulting fr ...
... our intial fabric study revealed flat to moderately dipping magmatic fabrics, which may reflect the tabular shape of this body. In the Votice area, durbachites also occur as moderately dipping sheet-like bodies displaying highly localized sub-solidus deformation and S-side-up kinematics resulting fr ...
church_hall
... Fig. 3a), but with the BG unit best simulating the variation in the G4 section. Only in the case of the G2 section is the total thickness clearly controlled by the LPL—but this is the on group that the authors consider to be anomalous and without explanation. The G2 group of ores is located near the ...
... Fig. 3a), but with the BG unit best simulating the variation in the G4 section. Only in the case of the G2 section is the total thickness clearly controlled by the LPL—but this is the on group that the authors consider to be anomalous and without explanation. The G2 group of ores is located near the ...
Collision of continental corner from 3
... in the ‘sticky air’ viscosity and/or increase in its thickness are precluded by numerical limitations of the multigrid solver convergence. Indeed, the large viscosity contrast caused by this lowviscosity boundary layer minimizes shear stresses (<105 Pa) at the top of the solid portion of the model ( ...
... in the ‘sticky air’ viscosity and/or increase in its thickness are precluded by numerical limitations of the multigrid solver convergence. Indeed, the large viscosity contrast caused by this lowviscosity boundary layer minimizes shear stresses (<105 Pa) at the top of the solid portion of the model ( ...
Conductivity distribution and seismicity in the northeastern Japan Arc Yukio Fujinawa
... striking difference is that relatively low values of the Poisson ratio (∼0.20–0.22) prevail beneath the Central Mountain Range compared with the Asahi Mountain Range. This can be construed as being a pointer towards the relatively poor saturation (fluid) state of rocks beneath the Central Mountain r ...
... striking difference is that relatively low values of the Poisson ratio (∼0.20–0.22) prevail beneath the Central Mountain Range compared with the Asahi Mountain Range. This can be construed as being a pointer towards the relatively poor saturation (fluid) state of rocks beneath the Central Mountain r ...
Geology of the Kettle River Area, Almond Mountain
... Regional extension during the Tertiary had a profound effect on the physiography and metallogeny of south-central BC, with low-angle detachment faults exhuming Proterozoic and Paleozoic gneissic and platform rocks that formed the metamorphic-core complexes of the southern Monashee Mountains, includi ...
... Regional extension during the Tertiary had a profound effect on the physiography and metallogeny of south-central BC, with low-angle detachment faults exhuming Proterozoic and Paleozoic gneissic and platform rocks that formed the metamorphic-core complexes of the southern Monashee Mountains, includi ...
ppt - nsf margins
... The accretion of island arc crust is believed to be a major contributor to the growth of continents. A particularly important question in arc evolution is the origin of felsic plutonic rocks in island arcs. Felsic rocks represent the nucleus of continents, yet there is no clear consensus on how thes ...
... The accretion of island arc crust is believed to be a major contributor to the growth of continents. A particularly important question in arc evolution is the origin of felsic plutonic rocks in island arcs. Felsic rocks represent the nucleus of continents, yet there is no clear consensus on how thes ...
PDF
... the dikes and the magnitude of anisotropy is likely smaller than that beneath active rifts. Paleozoic rifting of the aulacogen parallels a group of ca. 1350 Ma northwest-striking dikes (Thomas, 2006) and massive synrift intrusions are required to explain the linear gravity high (Fig. 1) and the seis ...
... the dikes and the magnitude of anisotropy is likely smaller than that beneath active rifts. Paleozoic rifting of the aulacogen parallels a group of ca. 1350 Ma northwest-striking dikes (Thomas, 2006) and massive synrift intrusions are required to explain the linear gravity high (Fig. 1) and the seis ...
Detrital Zircons from Missi Metasedimentary Rocks, Flin Flon Basin
... the Reindeer Zone did not occur until about 1810 Ma (Machado, 1990), and so the Flin Flon area was probably separated from Superior Province Archean rocks by an ocean basin at the time of Missi sedimentation. Bickford et al. (1990) suggest that collision between the Reindeer Zone, and the Rae-Hearne ...
... the Reindeer Zone did not occur until about 1810 Ma (Machado, 1990), and so the Flin Flon area was probably separated from Superior Province Archean rocks by an ocean basin at the time of Missi sedimentation. Bickford et al. (1990) suggest that collision between the Reindeer Zone, and the Rae-Hearne ...
unit 11 rocks - 1st ESO Bilingual Science
... 2. What is the name of a rock made of a single substance?..................................................................................... 3. Are all rocks solid?...................................................................................................................................... ...
... 2. What is the name of a rock made of a single substance?..................................................................................... 3. Are all rocks solid?...................................................................................................................................... ...
this PDF in a full window.
... Serpentinization reactions, the transformation of a dry peridodite to a wet serpentinite, have received considerable attention in the passive margin community (e.g. (Skelton et al., 2005)). One reason is that non-volcanic rifted margins show wide ocean-continent transitions zones of serpentinized ma ...
... Serpentinization reactions, the transformation of a dry peridodite to a wet serpentinite, have received considerable attention in the passive margin community (e.g. (Skelton et al., 2005)). One reason is that non-volcanic rifted margins show wide ocean-continent transitions zones of serpentinized ma ...
SCIENCE CHINA Magmatism during continental collision
... the last stage of collisional orogens, delamination of mountain root and collapse of mountains were the major events, which were accompanied by large scales of magmatic activity, e.g., post-collisional magmas in the Caledonian Orogen (Atherton et al., 2002, 2006) and in the North Qaidam UHPM belt (W ...
... the last stage of collisional orogens, delamination of mountain root and collapse of mountains were the major events, which were accompanied by large scales of magmatic activity, e.g., post-collisional magmas in the Caledonian Orogen (Atherton et al., 2002, 2006) and in the North Qaidam UHPM belt (W ...
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.