IDOE Workshop on Tectonic Patterns and Metallogenesis in East
... but with the increasing exploration effort for mineral resources in many parts ofthe region,it is rapidly changing from one ofthe least explored to one ofthe more extensively investigated parts of the world. The IDOE Workshop has as its main focus the need to develop a strategy and programme for the ...
... but with the increasing exploration effort for mineral resources in many parts ofthe region,it is rapidly changing from one ofthe least explored to one ofthe more extensively investigated parts of the world. The IDOE Workshop has as its main focus the need to develop a strategy and programme for the ...
Geology
... Bonin arc, where the major tectonic line (the Sofugan tectonic line) meets the volcanic front (Fig. 3). The 10-km-thick crust represents the thinnest arc crust among reported crustal structure of arcs on the Earth. The most important finding is the variation of the volume of the middle crust (Vp = 6 ...
... Bonin arc, where the major tectonic line (the Sofugan tectonic line) meets the volcanic front (Fig. 3). The 10-km-thick crust represents the thinnest arc crust among reported crustal structure of arcs on the Earth. The most important finding is the variation of the volume of the middle crust (Vp = 6 ...
The Tien Shan Early Paleozoic tectonics and geodynamics
... [8] Oceanic basin. This term defines the oceanic type of the earth crust in the study area is used regardless of the size and depth of the basin. This term is applicable to paleooceans, back- and inter-arc basins, and to intercontinent rifts with oceanic crust. [9] Microcontinent, continental island ...
... [8] Oceanic basin. This term defines the oceanic type of the earth crust in the study area is used regardless of the size and depth of the basin. This term is applicable to paleooceans, back- and inter-arc basins, and to intercontinent rifts with oceanic crust. [9] Microcontinent, continental island ...
GEOL 109 - Continuing Education
... d) As mentioned previously, we can't use radiometric dating to find the ages of sedimentary rocks directly. This means we have no way of estimating the age (in years) of a sedimentary rock. (5 points) ...
... d) As mentioned previously, we can't use radiometric dating to find the ages of sedimentary rocks directly. This means we have no way of estimating the age (in years) of a sedimentary rock. (5 points) ...
Thrusting, Active Back Thrusting and Tectonic Wedging: An Example
... The Surghar Range is the easternmost extension of the Trans-Indus Salt ranges of North Pakistan that appears as an arcuate mountain belt. The range follows in general an east-west structural trend while bordering the southern Kohat Plateau and switches to north-south trend along the eastern flank of ...
... The Surghar Range is the easternmost extension of the Trans-Indus Salt ranges of North Pakistan that appears as an arcuate mountain belt. The range follows in general an east-west structural trend while bordering the southern Kohat Plateau and switches to north-south trend along the eastern flank of ...
Plate Tectonic Evolution and Mineral Resource
... During the rifting phase, basic to acid volcanic rocks were extruded in a submarine environment to form small-scale Kuroko-type volcanogenic massive sulfide (VMS) deposits. They form a belt along the central and southern Lancang River. Deposits of this type are Sandashan, Yinzishan, Dapingzhang and ...
... During the rifting phase, basic to acid volcanic rocks were extruded in a submarine environment to form small-scale Kuroko-type volcanogenic massive sulfide (VMS) deposits. They form a belt along the central and southern Lancang River. Deposits of this type are Sandashan, Yinzishan, Dapingzhang and ...
What happened 1.5 billion years ago?
... area in a single intrusion can have compositions differing widely from the mean for the intrusion. Thus, a diverse group of magmas and processes played a part in anorthosite formation, rather than a single magma undergoing a unique process of differentiation. This in turn suggests that a favorable s ...
... area in a single intrusion can have compositions differing widely from the mean for the intrusion. Thus, a diverse group of magmas and processes played a part in anorthosite formation, rather than a single magma undergoing a unique process of differentiation. This in turn suggests that a favorable s ...
The Great Rift Valley
... Part II. The East African Rift If the rifting process described occurs in a continental setting, then we have a situation similar to what is now occurring in Kenya where the East African/Gregory Rift is forming. In this case it is referred to as "continental rifting" (for obvious reasons) and provid ...
... Part II. The East African Rift If the rifting process described occurs in a continental setting, then we have a situation similar to what is now occurring in Kenya where the East African/Gregory Rift is forming. In this case it is referred to as "continental rifting" (for obvious reasons) and provid ...
6 Metamorphic Rocks
... Figure 6.1B shows a more detailed view of metamorphic rocks.The alteration and deformation of the rock are evident in the alternating layers of light and dark minerals.These rocks were intensely sheared along almost horizontal planes while it was in a plastic or semiplastic state. The degree of plas ...
... Figure 6.1B shows a more detailed view of metamorphic rocks.The alteration and deformation of the rock are evident in the alternating layers of light and dark minerals.These rocks were intensely sheared along almost horizontal planes while it was in a plastic or semiplastic state. The degree of plas ...
Attachment between brittle and ductile crust at wrenching
... linear fabrics are predicted. Attachment zones beneath rotating blocks should display radiating foliation and concentric lineations; if rotation of rigid blocks is driven from below, deformation in the attachment zone is dominated by the wrench component, altering significantly the radiating and con ...
... linear fabrics are predicted. Attachment zones beneath rotating blocks should display radiating foliation and concentric lineations; if rotation of rigid blocks is driven from below, deformation in the attachment zone is dominated by the wrench component, altering significantly the radiating and con ...
Geophysical insights into the Transition fault debate: Propagating
... On the basis of faulting mapped on seismic reflection and bathymetric data, seismicity, current plate motions, and evidence that the Yakutat block may be anomalously thick, we propose a tectonic model for Yakutat-Pacific interactions, including the often-debated Transition fault. To the east, deform ...
... On the basis of faulting mapped on seismic reflection and bathymetric data, seismicity, current plate motions, and evidence that the Yakutat block may be anomalously thick, we propose a tectonic model for Yakutat-Pacific interactions, including the often-debated Transition fault. To the east, deform ...
Geology - SCERT - Government of Kerala
... surface are crystallized from some type of silicate magma, which means the melt was made up mostly of the two elements silicon and oxygen, combined to form "silica", or SiO2. This is because of the relative abundances of oxygen and silicon in magmas. The continental areas are made up of close to 60 ...
... surface are crystallized from some type of silicate magma, which means the melt was made up mostly of the two elements silicon and oxygen, combined to form "silica", or SiO2. This is because of the relative abundances of oxygen and silicon in magmas. The continental areas are made up of close to 60 ...
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 ...
Aseismic zone and earthquake segmentation associated with a
... thrust sub-events, occurred in 2000 in the downgoing plate8 , at the southeastern end of the rupture area of the great (M > 8.8) 1833 and 2007 earthquakes (Fig. 1). The epicentre of this earthquake lies on our profile in the forearc basin, northeast of Enggano Island (Fig. 1 and Supplementary Fig. S ...
... thrust sub-events, occurred in 2000 in the downgoing plate8 , at the southeastern end of the rupture area of the great (M > 8.8) 1833 and 2007 earthquakes (Fig. 1). The epicentre of this earthquake lies on our profile in the forearc basin, northeast of Enggano Island (Fig. 1 and Supplementary Fig. S ...
Precambrian Rocks of Alaska
... been restricted to the usage of Leffingwell and renamed the Neruokpuk Quartzite (Reiser and others, 1978). The Neruokpuk Quartzite is unconformably overlain in ascending sequence by a chert and phyllite unit, a calcareous siltstone and sandstone unit, a black phyllite and sandstone unit, and a volca ...
... been restricted to the usage of Leffingwell and renamed the Neruokpuk Quartzite (Reiser and others, 1978). The Neruokpuk Quartzite is unconformably overlain in ascending sequence by a chert and phyllite unit, a calcareous siltstone and sandstone unit, a black phyllite and sandstone unit, and a volca ...
DNR San Juan Islands Brandon
... The oldest terrane is the Chilliwack (Monger and Berg, 1987), which records intermittent arc-magmatism from at least the Cambrian to Middle Jurassic. This terrane is synonymous with the Grandy Ridge terrane of Haugerud (this volume) and the Turtleback terrane of Brandon and others (1988). The Chilli ...
... The oldest terrane is the Chilliwack (Monger and Berg, 1987), which records intermittent arc-magmatism from at least the Cambrian to Middle Jurassic. This terrane is synonymous with the Grandy Ridge terrane of Haugerud (this volume) and the Turtleback terrane of Brandon and others (1988). The Chilli ...
Chapter 11
... (crystals) in an igneous rock. In that case, you will end up with the entire rock having minerals aligned in a certain direction, all by the breaking of bonds between atoms in a mineral, and reforming (recrystallizing) in the lower pressure areas among the grains or crystals in the rock. The end res ...
... (crystals) in an igneous rock. In that case, you will end up with the entire rock having minerals aligned in a certain direction, all by the breaking of bonds between atoms in a mineral, and reforming (recrystallizing) in the lower pressure areas among the grains or crystals in the rock. The end res ...
Structure of the crust beneath Cameroon, West Africa, from the joint
... least-squares misfit comparable, a normalization of the data set is necessary, and this is done using the number of data points and variance for each of the data sets. An influence factor is used to control the trade-off between fitting the receiver functions and the group velocity curves. During th ...
... least-squares misfit comparable, a normalization of the data set is necessary, and this is done using the number of data points and variance for each of the data sets. An influence factor is used to control the trade-off between fitting the receiver functions and the group velocity curves. During th ...
1 BGS Open Report: OR/10/044 GUIDE TO THE GEOLOGY OF
... volcaniclastic succession. This is an ‘umbrella’ term for bracketing strata containing varying proportions of grains derived from the erosion of preexisting volcanic successions (epiclastic origin), as well as material incorporated into the rock directly from volcanic eruptions (pyroclastic origin) ...
... volcaniclastic succession. This is an ‘umbrella’ term for bracketing strata containing varying proportions of grains derived from the erosion of preexisting volcanic successions (epiclastic origin), as well as material incorporated into the rock directly from volcanic eruptions (pyroclastic origin) ...
introduction - KFUPM Faculty List
... Najd Faults system form in a group in en echelon form distance between each group and the other is about 70 km. ...
... Najd Faults system form in a group in en echelon form distance between each group and the other is about 70 km. ...
Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario
... weathering of ultramafic rocks, are also substantial sources of Ni, and have global reserves greater than those of Ni-Cu sulphide deposits. Lateritic Ni deposits do not occur in Canada, but will probably in time become the main source of nickel. Magmatic PGE deposits and Ni-Cu sulphide deposits are ...
... weathering of ultramafic rocks, are also substantial sources of Ni, and have global reserves greater than those of Ni-Cu sulphide deposits. Lateritic Ni deposits do not occur in Canada, but will probably in time become the main source of nickel. Magmatic PGE deposits and Ni-Cu sulphide deposits are ...
Subduction factory 2. Are intermediate
... between the patterns of intermediate-depth seismicity and the locations of predicted hydrous minerals: Earthquakes occur in subducting slabs where dehydration is expected, and they are absent from parts of slabs predicted to be anhydrous. We propose that a subducting oceanic plate can consist of fou ...
... between the patterns of intermediate-depth seismicity and the locations of predicted hydrous minerals: Earthquakes occur in subducting slabs where dehydration is expected, and they are absent from parts of slabs predicted to be anhydrous. We propose that a subducting oceanic plate can consist of fou ...
poster technical sessions
... Situated at the intersection of the Eurasian, African, and Arabian plates, Anatolia and the eastern Mediterranean region form one of the most seismically and volcanically active tectonic zones in the Alpine-Himalayan orogenic system. This broad zone of convergence is dominated by crustal extension a ...
... Situated at the intersection of the Eurasian, African, and Arabian plates, Anatolia and the eastern Mediterranean region form one of the most seismically and volcanically active tectonic zones in the Alpine-Himalayan orogenic system. This broad zone of convergence is dominated by crustal extension a ...
GEOLOGY OF THE BUCHANS–ROBERTS ARM VOLCANIC BELT
... tectonic strike, drawn from the eastern shore of Great Gull Lake to the vicinity of Kippens Pond, southwest of Badger Bay (Figure 3). Here, the Baker Brook, Burnt Pond and Powderhorn Lake tracts occur on the southwest flank of a regional antiformal thrust stack cored by the Middle Ordovician and old ...
... tectonic strike, drawn from the eastern shore of Great Gull Lake to the vicinity of Kippens Pond, southwest of Badger Bay (Figure 3). Here, the Baker Brook, Burnt Pond and Powderhorn Lake tracts occur on the southwest flank of a regional antiformal thrust stack cored by the Middle Ordovician and old ...
Radiometric dating results 5
... U tracer prior to decomposition. The sample aliquots, dissolved in 3.1 N HCl (ID aliquots and 205Pbspiked samples) or 2 N HCl (IC aliquots), were loaded onto anion exchange columns with 50 µl resin volume for extraction of Pb and U. Pb was loaded on Re single filaments with silica gel and H3PO4. U w ...
... U tracer prior to decomposition. The sample aliquots, dissolved in 3.1 N HCl (ID aliquots and 205Pbspiked samples) or 2 N HCl (IC aliquots), were loaded onto anion exchange columns with 50 µl resin volume for extraction of Pb and U. Pb was loaded on Re single filaments with silica gel and H3PO4. U 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.