Stress and Strain - Academic Home Page
... FAULT: A surface or narrow zone along which one side has moved relative to the other. A fault may form through either brittle (fractures) or ductile (shear) deformation. Faults are classified based upon the orientation of the displacement vector along the fault surface. DIP-SLIP FAULTS: Faults alo ...
... FAULT: A surface or narrow zone along which one side has moved relative to the other. A fault may form through either brittle (fractures) or ductile (shear) deformation. Faults are classified based upon the orientation of the displacement vector along the fault surface. DIP-SLIP FAULTS: Faults alo ...
Geologic Map of the Prisor Hill Quadrangle, Sierra
... formation. It certainly underlies much of the surficial deposits east and north of Prisor Hill and Upham Hills, as well as those north of Point of Rocks Hills. Outcrops are restricted to the southwestern side of Upham Hills and the northeastern corner of Point of Rocks Hills. Light purple to bluish ...
... formation. It certainly underlies much of the surficial deposits east and north of Prisor Hill and Upham Hills, as well as those north of Point of Rocks Hills. Outcrops are restricted to the southwestern side of Upham Hills and the northeastern corner of Point of Rocks Hills. Light purple to bluish ...
The Rio Grande rift, Part I: Modifications and additions
... west of the rift is drifting faster than the continental interior (mantle convection may be pulling it over the East Pacific Rise in a "conveyor belt" manner similar to that suggested by Cook, 1962); resultant crustal attenuation formed the Basin and Range province and is splitting the Colorado Plat ...
... west of the rift is drifting faster than the continental interior (mantle convection may be pulling it over the East Pacific Rise in a "conveyor belt" manner similar to that suggested by Cook, 1962); resultant crustal attenuation formed the Basin and Range province and is splitting the Colorado Plat ...
7. Skagit River
... Figure 3 (Above) Rock, ice and subalpine meadows. The meadows in the foreground are heather, typical of the cover on igneous rocks like the granitic varieties seen here. The dark green meadows in the background are lush herbaceous species, growing on iron-rich metamorphic and metavolcanic rocks. Th ...
... Figure 3 (Above) Rock, ice and subalpine meadows. The meadows in the foreground are heather, typical of the cover on igneous rocks like the granitic varieties seen here. The dark green meadows in the background are lush herbaceous species, growing on iron-rich metamorphic and metavolcanic rocks. Th ...
The tectonic evolution of Sabah provides... development. The summary below was compiled... 2.1 TECTONIC EVOLUTION AND BASIN DEVELOPMENT IN SABAH
... Formation and Crystalline Basement (Leong, 1974). These events also deformed and gradually uplifted the overlying Eocene to early Miocene sediments in the western area (Balaguru, 2006a). The break up of Celebes Sea, at the same time, has developed the SE Pacific margin accretionary complex on Cretac ...
... Formation and Crystalline Basement (Leong, 1974). These events also deformed and gradually uplifted the overlying Eocene to early Miocene sediments in the western area (Balaguru, 2006a). The break up of Celebes Sea, at the same time, has developed the SE Pacific margin accretionary complex on Cretac ...
NWGS Priest River
... (Left) Map showing field stop locations. coexisting with garnet, sillimanite, biotite, and rutile; muscovite is largely absent. Look closely and you will find small crystals of kyanite in contact with garnet and K-feldspar. These mineral assemblages attesting to partial melting of these rocks in the ...
... (Left) Map showing field stop locations. coexisting with garnet, sillimanite, biotite, and rutile; muscovite is largely absent. Look closely and you will find small crystals of kyanite in contact with garnet and K-feldspar. These mineral assemblages attesting to partial melting of these rocks in the ...
precambrian geology of the truchas peaks region, north
... have been deposited in a similar environment. Metavolcanic rocks of the Vadito Formation are underlain and overlain by massive quartzite, and so, do not represent a changing depositional /tectonic environment, but rather exist as flows, tuffs and volcanic debris deposited and reworked atop the stabl ...
... have been deposited in a similar environment. Metavolcanic rocks of the Vadito Formation are underlain and overlain by massive quartzite, and so, do not represent a changing depositional /tectonic environment, but rather exist as flows, tuffs and volcanic debris deposited and reworked atop the stabl ...
ch 4
... In contrast to the events of the more distant past, the events of this episode have preserved a true abundance of information on the course of geologic evolution here. We can map the appearance of magma species, the orientation and magnitude of folds, the character and displacement of faults, and w ...
... In contrast to the events of the more distant past, the events of this episode have preserved a true abundance of information on the course of geologic evolution here. We can map the appearance of magma species, the orientation and magnitude of folds, the character and displacement of faults, and w ...
Paleogeographic and tectonic implications of Jurassic sedimentary
... age of extension and development of the angular unconformity between the Upper and Lower Sidewinder volcanic series at ca. 151 Ma. The data suggest that at least part, and possibly all, of the Fairview Valley Formation is late Early Jurassic in age. We correlate the Fairview Valley Formation with Me ...
... age of extension and development of the angular unconformity between the Upper and Lower Sidewinder volcanic series at ca. 151 Ma. The data suggest that at least part, and possibly all, of the Fairview Valley Formation is late Early Jurassic in age. We correlate the Fairview Valley Formation with Me ...
hofstra university 1c field guidebook a geological transect from new
... volcanic activity vast quantities of "instant" new regolith are created by explosions (which may involve new igneous rocks in their formative stages or old rocks through which the magma passes on its way to the surface). Because of its enormous surface area and glass content, volcanic regolith can ...
... volcanic activity vast quantities of "instant" new regolith are created by explosions (which may involve new igneous rocks in their formative stages or old rocks through which the magma passes on its way to the surface). Because of its enormous surface area and glass content, volcanic regolith can ...
geotour guide - Ministry of Energy and Mines and Responsible for
... The Purcell Mountains extend from the Rocky Mountain Trench to Kootenay Lake. Most of the southern Purcell Mountains, including those exposed along Mark Creek, are sandstone and mudstone interpreted by geologists to be over 1.4 billion years old. These are the oldest sedimentary rock in British Colu ...
... The Purcell Mountains extend from the Rocky Mountain Trench to Kootenay Lake. Most of the southern Purcell Mountains, including those exposed along Mark Creek, are sandstone and mudstone interpreted by geologists to be over 1.4 billion years old. These are the oldest sedimentary rock in British Colu ...
Mineral deposits and structural pattern of the Big Burro Mountains
... crystals of andesine up to 5 cm in length set in a coarsegrained matrix of smaller crystals of andesine, oligoclase, quartz, and biotite. The plagioclase feldspars constitute about 45-50 percent of the rock, biotite 25-30 percent, and quartz 15-20 percent. Hornblende (2-3 percent) and microdine are ...
... crystals of andesine up to 5 cm in length set in a coarsegrained matrix of smaller crystals of andesine, oligoclase, quartz, and biotite. The plagioclase feldspars constitute about 45-50 percent of the rock, biotite 25-30 percent, and quartz 15-20 percent. Hornblende (2-3 percent) and microdine are ...
guidebook san luis basin, colorado
... west of the rift is drifting faster than the continental interior (mantle convection may be pulling it over the East Pacific Rise in a "conveyor belt" manner similar to that suggested by Cook, 1962); resultant crustal attenuation formed the Basin and Range province and is splitting the Colorado Plat ...
... west of the rift is drifting faster than the continental interior (mantle convection may be pulling it over the East Pacific Rise in a "conveyor belt" manner similar to that suggested by Cook, 1962); resultant crustal attenuation formed the Basin and Range province and is splitting the Colorado Plat ...
Mineral deposits and structurral pattern of the Big Burro Mountains
... crystals of andesine up to 5 cm in length set in a coarsegrained matrix of smaller crystals of andesine, oligoclase, quartz, and biotite. The plagioclase feldspars constitute about 45-50 percent of the rock, biotite 25-30 percent, and quartz 15-20 percent. Hornblende (2-3 percent) and microdine are ...
... crystals of andesine up to 5 cm in length set in a coarsegrained matrix of smaller crystals of andesine, oligoclase, quartz, and biotite. The plagioclase feldspars constitute about 45-50 percent of the rock, biotite 25-30 percent, and quartz 15-20 percent. Hornblende (2-3 percent) and microdine are ...
geomorphology - About Manidhaneyam
... the features are the largest that can be recognized continental platform and ocean basins. Although the shoreline at sea level appears as a conspicuous demarcation between land and water, it is not the accepted boundary between platform and basins, each continent has a margin that is submerged, call ...
... the features are the largest that can be recognized continental platform and ocean basins. Although the shoreline at sea level appears as a conspicuous demarcation between land and water, it is not the accepted boundary between platform and basins, each continent has a margin that is submerged, call ...
SSlamang-Poster2014
... to determine the depositional environment of each of the members. The Whitehill Formation has an average thickness of ~20-30m and is composed predominantly of shales The area was chosen as it incorporates an exceptionally well exposed outcrop along the Ecca Pass, portraying all the formations of the ...
... to determine the depositional environment of each of the members. The Whitehill Formation has an average thickness of ~20-30m and is composed predominantly of shales The area was chosen as it incorporates an exceptionally well exposed outcrop along the Ecca Pass, portraying all the formations of the ...
Proterozoic rocks of the Pilar Cliffs, Picuris Mountains, New Mexico
... zones. The Pilar cliffs section forms the north limb of the large, shallowly plunging, east-trending, overturned Hondo syncline. The south-dipping contact (Pilar shear zone) between the Glenwoody Formation and the overlying, upright Ortega Formation in the Pilar cliffs is a ductile shear zone preser ...
... zones. The Pilar cliffs section forms the north limb of the large, shallowly plunging, east-trending, overturned Hondo syncline. The south-dipping contact (Pilar shear zone) between the Glenwoody Formation and the overlying, upright Ortega Formation in the Pilar cliffs is a ductile shear zone preser ...
Cambrian palaeomagnetic data confirm a Natal Embayment location
... The Liberty Hills Formation comprises a 1000 m thick sequence of conglomerates, quartzites, argillites and mafic lava. Lateral facies variations reveal a northward change in depositional environment from coarse-grained fluvial deposits, through transitional deltaic to fine-grained shallow marine uni ...
... The Liberty Hills Formation comprises a 1000 m thick sequence of conglomerates, quartzites, argillites and mafic lava. Lateral facies variations reveal a northward change in depositional environment from coarse-grained fluvial deposits, through transitional deltaic to fine-grained shallow marine uni ...
Magmatism and tectonics in a tilted crustal section through a
... magmatic flux. In a like manner, more precise geochronologic control on evolution of the foreland fold-and-thrust belt is necessary to better establish the orogen-wide stress field over long time scales, and thus clarify whether foreland shortening is a cause or consequence of convergent margin arc ...
... magmatic flux. In a like manner, more precise geochronologic control on evolution of the foreland fold-and-thrust belt is necessary to better establish the orogen-wide stress field over long time scales, and thus clarify whether foreland shortening is a cause or consequence of convergent margin arc ...
Post-Hercynian formations of the western Tauern window
... is also valid for the lime-rich members (Fig. lc). Despite metamorphism, the carbonatic or quartzitic layers often reveal graded bedding (see below). Hence it may be suggested that the entire sequence of the BS-TF formation, or at least the great part of it, has been deposited as turbidity currents. ...
... is also valid for the lime-rich members (Fig. lc). Despite metamorphism, the carbonatic or quartzitic layers often reveal graded bedding (see below). Hence it may be suggested that the entire sequence of the BS-TF formation, or at least the great part of it, has been deposited as turbidity currents. ...
Geology of Northern California Geolo
... subducted under the leading edge ed of the North American plate as it slowly moved ved west. The T last and largest of the oceanic plates to descend beneath North America was the bene Farallon plate, remnants of which still exist along the western margin of North and Central America. This plate tect ...
... subducted under the leading edge ed of the North American plate as it slowly moved ved west. The T last and largest of the oceanic plates to descend beneath North America was the bene Farallon plate, remnants of which still exist along the western margin of North and Central America. This plate tect ...
2015 Coaches Institute Handout - North Carolina Science Olympiad
... between rock units that were deposited in layers one on top of another in a continuous sequence. These are typically sedimentary rocks, but volcanic units may also be part of a conformable sequence. Unconformable contacts are the result of unconformities, or periods of erosion, as described in Lab 4 ...
... between rock units that were deposited in layers one on top of another in a continuous sequence. These are typically sedimentary rocks, but volcanic units may also be part of a conformable sequence. Unconformable contacts are the result of unconformities, or periods of erosion, as described in Lab 4 ...
2.5 MB Notes file that accompanies map ()
... The Benson Lake pendant preserves evidence of at least five deformation phases that are represented by five sets of crosscutting structures. While the older phases are best preserved in the quartzitic units, the younger structures are more apparent in the weaker, metapelitic rocks. Primary, sediment ...
... The Benson Lake pendant preserves evidence of at least five deformation phases that are represented by five sets of crosscutting structures. While the older phases are best preserved in the quartzitic units, the younger structures are more apparent in the weaker, metapelitic rocks. Primary, sediment ...
Hydrothermal vent Activities At the Gjallar Ridge In the
... fluids emitted by hydrothermal vents. (2) serpentinisation of ultramafic rocks (peridotite). The rise of methane-rich plumes into the water column and diapiric serpentinite bodies identification show that this process occurs near spreading centres and near subduction zones (3) Layered mafic intrusio ...
... fluids emitted by hydrothermal vents. (2) serpentinisation of ultramafic rocks (peridotite). The rise of methane-rich plumes into the water column and diapiric serpentinite bodies identification show that this process occurs near spreading centres and near subduction zones (3) Layered mafic intrusio ...
DaVince Tools Generated PDF File
... ABSTRACT The Sangre de Cristo Range from Blanca Peak northward to the Arkansas River in Colorado is composed mostly of Precambrian crystalline rocks and upper Paleozoic clastic sedimentary rocks. These rocks have been folded and faulted by Laramide compressional forces from Late Cretaceous to Eocene ...
... ABSTRACT The Sangre de Cristo Range from Blanca Peak northward to the Arkansas River in Colorado is composed mostly of Precambrian crystalline rocks and upper Paleozoic clastic sedimentary rocks. These rocks have been folded and faulted by Laramide compressional forces from Late Cretaceous to Eocene ...
Geology of the Death Valley area
The exposed geology of the Death Valley area presents a diverse and complex set of at least 23 formations of sedimentary units, two major gaps in the geologic record called unconformities, and at least one distinct set of related formations geologists call a group. The oldest rocks in the area that now includes Death Valley National Park are extensively metamorphosed by intense heat and pressure and are at least 1700 million years old. These rocks were intruded by a mass of granite 1400 Ma (million years ago) and later uplifted and exposed to nearly 500 million years of erosion.Marine deposition occurred 1200 to 800 Ma, creating thick sequences of conglomerate, mudstone, and carbonate rock topped by stromatolites, and possibly glacial deposits from the hypothesized Snowball Earth event. Rifting thinned huge roughly linear parts of the supercontinent Rodinia enough to allow sea water to invade and divide its landmass into component continents separated by narrow straits. A passive margin developed on the edges of these new seas in the Death Valley region. Carbonate banks formed on this part of the two margins only to be subsided as the continental crust thinned until it broke, giving birth to a new ocean basin. An accretion wedge of clastic sediment then started to accumulate at the base of the submerged precipice, entombing the region's first known fossils of complex life. These sandy mudflats gave way about 550 Ma to a carbonate platform which lasted for the next 300 million years of Paleozoic time.The passive margin switched to active margin in the early-to-mid Mesozoic when the Farallon Plate under the Pacific Ocean started to dive below the North American Plate, creating a subduction zone; volcanoes and uplifting mountains were created as a result. Erosion over many millions of years created a relatively featureless plain. Stretching of the crust under western North America started around 16 Ma and is thought to be caused by upwelling from the subducted spreading-zone of the Farallon Plate. This process continues into the present and is thought to be responsible for creating the Basin and Range province. By 2 to 3 million years ago this province had spread to the Death Valley area, ripping it apart and creating Death Valley, Panamint Valley and surrounding ranges. These valleys partially filled with sediment and, during colder periods during the current ice age, with lakes. Lake Manly was the largest of these lakes; it filled Death Valley during each glacial period from 240,000 years ago to 10,000 years ago. By 10,500 years ago these lakes were increasingly cut off from glacial melt from the Sierra Nevada, starving them of water and concentrating salts and minerals. The desert environment seen today developed after these lakes dried up.