Abyssal peridotites, very slow spreading ridges and
... In addition to peridotite, other rocks, including diabase, gabbro and their greenschist and amphibolite facies equivalents are commonly found at fracture zones. Weathered and metamorphosed pillow basalt, however, is by far the most common rock found. In some cases, dredges spaced systematically up f ...
... In addition to peridotite, other rocks, including diabase, gabbro and their greenschist and amphibolite facies equivalents are commonly found at fracture zones. Weathered and metamorphosed pillow basalt, however, is by far the most common rock found. In some cases, dredges spaced systematically up f ...
alleghanian plutonism in the eastern blue ridge
... The Alleghanian orogeny was caused by the closing of the Theic ocean basin and subsequent collision of Gondwana with Laurentia. The orientation of the subducted Theic oceanic lithosphere is unknown but may be recorded in Carboniferous magmatism recently discovered in the southern Appalachians. The f ...
... The Alleghanian orogeny was caused by the closing of the Theic ocean basin and subsequent collision of Gondwana with Laurentia. The orientation of the subducted Theic oceanic lithosphere is unknown but may be recorded in Carboniferous magmatism recently discovered in the southern Appalachians. The f ...
FRICTIONAL PROPERTIES OF NATURAL FAULT GOUGE FROM A
... Mechanisms for both of these phenomena are geologically reasonable and relatively intuitive. At elevated pore pressures, effective stress is reduced and the frictional failure criterion is met for a wider range of fault planes (Figure 2a). In laboratory studies, synthetic fault gouge containing expa ...
... Mechanisms for both of these phenomena are geologically reasonable and relatively intuitive. At elevated pore pressures, effective stress is reduced and the frictional failure criterion is met for a wider range of fault planes (Figure 2a). In laboratory studies, synthetic fault gouge containing expa ...
Impact resistance of Illinois limestones and
... Of the limestones reported in this study (see table 4) only samples NF512, NF511, NF527, 1009, and K19 have noteworthy amounts of impurities consisting of dolomite and/or quartz grains, but these grains are dispersed so thinly that they do not noticeably affect the impact modulus. No calcite was det ...
... Of the limestones reported in this study (see table 4) only samples NF512, NF511, NF527, 1009, and K19 have noteworthy amounts of impurities consisting of dolomite and/or quartz grains, but these grains are dispersed so thinly that they do not noticeably affect the impact modulus. No calcite was det ...
Field Guide to the Punchbowl Fault Zone at Devil`s Punchbowl Los
... Between 2.5 and approximately 100 m from the fault surface, microfractures display a single preferred orientation that is perpendicular to the fault surface and to the slip direction of the fault. The microfracture fabrics are inconsistent with models of fracture formation during the initial stages ...
... Between 2.5 and approximately 100 m from the fault surface, microfractures display a single preferred orientation that is perpendicular to the fault surface and to the slip direction of the fault. The microfracture fabrics are inconsistent with models of fracture formation during the initial stages ...
Seismic evidence of Alpine crustal thickening and wedging from the
... Figure 6. Shot A recorded toward the east along profile 1. (top) Record section. (bottom) Synthetic section from the velocity-depth model of Figure 5. extension of the crust reached a maximum during this period with the occurrence of submarine volcanism but without oceanization. In the Late Cretaceo ...
... Figure 6. Shot A recorded toward the east along profile 1. (top) Record section. (bottom) Synthetic section from the velocity-depth model of Figure 5. extension of the crust reached a maximum during this period with the occurrence of submarine volcanism but without oceanization. In the Late Cretaceo ...
No. 51. The Sveconorwegian Orogen of southern Scandinavia
... The Sveconorwegian orogen in southern Scandinavia is the result of a collision between Fennoscandia (the southwestern continental segment of Baltica) and another continent in late Mesoproterozoic time. The orogenic province is composed of five distinct Proterozoic gneiss segments that were displaced ...
... The Sveconorwegian orogen in southern Scandinavia is the result of a collision between Fennoscandia (the southwestern continental segment of Baltica) and another continent in late Mesoproterozoic time. The orogenic province is composed of five distinct Proterozoic gneiss segments that were displaced ...
GEOLOGICAL SURVEY OF FINLAND Special Paper 48 2008 GTK
... interpretation of remote sensing data, comprising previous geological maps, satellite images, and new regional and high resolution radiometric and magnetic airborne data. Field verification was performed at 20 000 observation sites, supported by nearly 30 000 digital photographs of outcrops and selec ...
... interpretation of remote sensing data, comprising previous geological maps, satellite images, and new regional and high resolution radiometric and magnetic airborne data. Field verification was performed at 20 000 observation sites, supported by nearly 30 000 digital photographs of outcrops and selec ...
Sedimentary record of the tectonic growth of a collisional continental
... sandstone. The overall stratigraphy of the Nutzotin Mountains sequence represents a general upward-shallowing and upward-coarsening package that represents a general transition from distal mud-rich submarine-fan strata to more proximal sand-rich submarine-fan strata that are in turn overlain by mari ...
... sandstone. The overall stratigraphy of the Nutzotin Mountains sequence represents a general upward-shallowing and upward-coarsening package that represents a general transition from distal mud-rich submarine-fan strata to more proximal sand-rich submarine-fan strata that are in turn overlain by mari ...
Cenozoic geology of the Yerington district, Nevada, and implications
... farther south relative to the continent and when the oceanic spreading axis that had been between these fractures was interacting with the continent. ...
... farther south relative to the continent and when the oceanic spreading axis that had been between these fractures was interacting with the continent. ...
the complex tectonic events and their influence on formation
... minary survey of small area a in the ...
... minary survey of small area a in the ...
Geological Society of America Bulletin - User Web Pages
... retrogression with stretching lineation plunging SE, also indicative of dextral movement but with a NE-side-down component. A kinematic change from amphibolite- to greenschist-facies deformation was also documented further SE in Tibet along the shear zone (Valli et al., 2007, 2008), where greenschis ...
... retrogression with stretching lineation plunging SE, also indicative of dextral movement but with a NE-side-down component. A kinematic change from amphibolite- to greenschist-facies deformation was also documented further SE in Tibet along the shear zone (Valli et al., 2007, 2008), where greenschis ...
Makhtesh Ramon Geological Window, hyper
... the MR area and less soils. The area is mostly free of clouds throughout the year, and several weather stations that collect information on a diurnal basis have been dispersed throughout the area. The MR area is known as one of the most important mineralogical sites in Israel and has been called a “ ...
... the MR area and less soils. The area is mostly free of clouds throughout the year, and several weather stations that collect information on a diurnal basis have been dispersed throughout the area. The MR area is known as one of the most important mineralogical sites in Israel and has been called a “ ...
appendix 2 - Rockmass.net
... Knowledge of the origin or formation of the zone can be helpful in working out the description and evaluation of its composition and structure. But used in rock engineering and construction the features of main interest are connected to the actual properties and behaviour of the zone. Therefore, the ...
... Knowledge of the origin or formation of the zone can be helpful in working out the description and evaluation of its composition and structure. But used in rock engineering and construction the features of main interest are connected to the actual properties and behaviour of the zone. Therefore, the ...
Ghikas et al.IGR2010
... (2) North of Skoumtsa, (3) Frourio, and (4) the Aliakmonas River Valley (Figure 3). The Vourinos subophiolitic mélange locally contains numerous blocks and thrust sheets of various rock types, ranging in size from several metres to several kilometres. These subunits are typically less than 100 m th ...
... (2) North of Skoumtsa, (3) Frourio, and (4) the Aliakmonas River Valley (Figure 3). The Vourinos subophiolitic mélange locally contains numerous blocks and thrust sheets of various rock types, ranging in size from several metres to several kilometres. These subunits are typically less than 100 m th ...
GEOLOGIC MAP OF SOUTHEASTERN ALASKA INTRODUCTION
... Units of the undivided stratified and (or) metamorphosed and (or) deformed rocks category comprise stratified rocks and (or) their metamorphosed and (or) deformed equivalents that were not assigned to other categories of units because (1) their degree of deformation and (or) metamorphism are poorly ...
... Units of the undivided stratified and (or) metamorphosed and (or) deformed rocks category comprise stratified rocks and (or) their metamorphosed and (or) deformed equivalents that were not assigned to other categories of units because (1) their degree of deformation and (or) metamorphism are poorly ...
characterization and reconstruction of the tea cup porphyry system
... central Arizona that have been the focus of long-standing investigation (e.g. Ransome, 1903; Cornwall, 1978; Maher, 2008; Maher et al., this issue). Major deposits located in the district include Ray, Globe-Miami, Superior, and Christmas (Fig. 1). Exploration for porphyry copper deposits in the regi ...
... central Arizona that have been the focus of long-standing investigation (e.g. Ransome, 1903; Cornwall, 1978; Maher, 2008; Maher et al., this issue). Major deposits located in the district include Ray, Globe-Miami, Superior, and Christmas (Fig. 1). Exploration for porphyry copper deposits in the regi ...
Tectonic history of the Chihuahua trough, Mexico
... late Paleozoic and Mesozoic tectonic elements affecting the area of the Chihuahua trough and it is assumed that the zone began to develop during the Precambrian. Figure 2 shows a postulated boundary of the North American craton at the end of Proterozoic time. The boundary of the craton from the La B ...
... late Paleozoic and Mesozoic tectonic elements affecting the area of the Chihuahua trough and it is assumed that the zone began to develop during the Precambrian. Figure 2 shows a postulated boundary of the North American craton at the end of Proterozoic time. The boundary of the craton from the La B ...
Deep-sea basins of the Atlantic ocean
... is, 100 million years ago, their isolated development lasting more than 50 million years. One more important fact need be mentioned. The opening of the ocean in the South Atlantic region followed the desintegration of Gondwana. The Central Atlantic Ocean had a more complicated geological prehistory: ...
... is, 100 million years ago, their isolated development lasting more than 50 million years. One more important fact need be mentioned. The opening of the ocean in the South Atlantic region followed the desintegration of Gondwana. The Central Atlantic Ocean had a more complicated geological prehistory: ...
Geologic Map and Cross Sections of the Embudo Fault Zone in the
... he southern Taos Valley encompasses the physiographic and geologic transition zone between the Picuris Mountains and the San Luis Basin of the Rio Grande rift. The Embudo fault zone is the rift transfer structure that has accommodated the kinematic disparities between the San Luis Basin and the Espa ...
... he southern Taos Valley encompasses the physiographic and geologic transition zone between the Picuris Mountains and the San Luis Basin of the Rio Grande rift. The Embudo fault zone is the rift transfer structure that has accommodated the kinematic disparities between the San Luis Basin and the Espa ...
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 ...
Did westward subduction cause Cretaceous
... of the topography directly reflects the development of the Cordilleran orogeny. The image was made and generously provided by Ray Sterner at The Johns Hopkins University Applied Physics Laboratory using digital elevation data obtained by the Shuttle Radar Topography Mission (SRTM), the 11-day STS-99 ...
... of the topography directly reflects the development of the Cordilleran orogeny. The image was made and generously provided by Ray Sterner at The Johns Hopkins University Applied Physics Laboratory using digital elevation data obtained by the Shuttle Radar Topography Mission (SRTM), the 11-day STS-99 ...
Papers presented to the Conference on Heat and Detachment in
... It should be noted that these values depend on flow laws which are somewhat uncertain due to their extrapolation from laboratory conditions. This model is not inconsistent with the thin lithosphere implied by the banded terrain. One might expect smaller scale fault blocks whose widths are controlled ...
... It should be noted that these values depend on flow laws which are somewhat uncertain due to their extrapolation from laboratory conditions. This model is not inconsistent with the thin lithosphere implied by the banded terrain. One might expect smaller scale fault blocks whose widths are controlled ...
petrogenesis of the oligocene east tintic volcanic field, utah
... southward across what is now the Basin and Range ...
... southward across what is now the Basin and Range ...
Structural Analysis of Ernst Tinaja Canyon Focusing on Strike
... pothole is in a narrow slot canyon that also features intense folds in thin, flaggy strata of the overlying Boquillas Formation. The complex geology of the Sierra Del Carmen region has been regionally mapped but is lacking in published detailed geologic maps, making this an interesting location for ...
... pothole is in a narrow slot canyon that also features intense folds in thin, flaggy strata of the overlying Boquillas Formation. The complex geology of the Sierra Del Carmen region has been regionally mapped but is lacking in published detailed geologic maps, making this an interesting location for ...
TaskForceMajella
The TaskForceMajella (TFM) is an industry funded geoscientific research project conducted between the years 1998 and 2005. The project involved numerous universities distributed worldwide, and was sponsored by a number of international major oil companies. The area of research was the Majella Mountain in Central Italy, regarded as an analogue of a faulted and fractured hydrocarbon reservoir as can be found in major provinces like the Middle East, Caspian Basin, Mediterranean Basin, and other areas. The scope was to obtain knowledge on the relation between fracture and fault generation, and all types of geological aspects of the evolution of the geological structure.