Document
... (5) Progressive evolution of a steep orebearing stockwork from the early, short, and irregularly arranged veins and veinlets closely related to emplacement of intrusions via transitional veins lying in one plane to the late through veins and breccia bodies related to regional and local stress fields ...
... (5) Progressive evolution of a steep orebearing stockwork from the early, short, and irregularly arranged veins and veinlets closely related to emplacement of intrusions via transitional veins lying in one plane to the late through veins and breccia bodies related to regional and local stress fields ...
Sedimentary Geology and Paleontology
... sedimentary record filling a basin are tectonics, climate, and sea level changes. Sequence stratigraphy (a recent development in sedimentary geology) investigates the role of external controls in shaping the architecture of the depositional sequences. Fossils, a very important and common component o ...
... sedimentary record filling a basin are tectonics, climate, and sea level changes. Sequence stratigraphy (a recent development in sedimentary geology) investigates the role of external controls in shaping the architecture of the depositional sequences. Fossils, a very important and common component o ...
Tertiary tectonics of the sub-Andean region of the North Patagonian
... the external sector of the North Patagonian Andes fold-and-thrust belt, which is characterized by east-vergent thrusts that affect stratified Cenozoic rocks. The units involved in the deformation correspond to El Maitén Oligocene volcanic belt, deformed between east-vergent thrusts and backthrusts, ...
... the external sector of the North Patagonian Andes fold-and-thrust belt, which is characterized by east-vergent thrusts that affect stratified Cenozoic rocks. The units involved in the deformation correspond to El Maitén Oligocene volcanic belt, deformed between east-vergent thrusts and backthrusts, ...
Dynamical effects of subducting ridges: insights from 3
... In the following, we model the subduction of a 80-km-thick lithosphere (∼50-Myr-old oceanic plate). In case the thickness of the oceanic crust is ‘normal’ (∼7 km), the 50-Myr-old oceanic lithosphere is negatively buoyant with respect to the asthenosphere, and its average buoyancy (ρ L ) Nature = −3 ...
... In the following, we model the subduction of a 80-km-thick lithosphere (∼50-Myr-old oceanic plate). In case the thickness of the oceanic crust is ‘normal’ (∼7 km), the 50-Myr-old oceanic lithosphere is negatively buoyant with respect to the asthenosphere, and its average buoyancy (ρ L ) Nature = −3 ...
Extensional and transtensional continental arc basins: case studies
... extension was superimposed across a high, broad plain produced by low-angle subduction time under a contractional strain regime during Late Mesozoic to Paleocene time, termed the “Nevadaplano” (DeCelles, 2004). Also shown is the locus of the Cretaceous Sierra Nevada batholith and its extension into ...
... extension was superimposed across a high, broad plain produced by low-angle subduction time under a contractional strain regime during Late Mesozoic to Paleocene time, termed the “Nevadaplano” (DeCelles, 2004). Also shown is the locus of the Cretaceous Sierra Nevada batholith and its extension into ...
Paleomagnetic study of the Messejana Plasencia dyke - E
... were mostly thetmally demagnetized. Most sites exhibit a characteristic remanent component of nOlmal polarity with the exception of two sites, where samples with reversed polarities have been observed. The paleomagnetic pole derived from a total of 35 valid sites is representative of the whole struc ...
... were mostly thetmally demagnetized. Most sites exhibit a characteristic remanent component of nOlmal polarity with the exception of two sites, where samples with reversed polarities have been observed. The paleomagnetic pole derived from a total of 35 valid sites is representative of the whole struc ...
CONTACT METAMORPHISM and INTRUSIVE RELATIONS
... Complex, Croton Falls Complex, Rosetown Pluton, Torment Hill and Stony Point Plutons have been recognized by various workers. ...
... Complex, Croton Falls Complex, Rosetown Pluton, Torment Hill and Stony Point Plutons have been recognized by various workers. ...
Spring 2009 Showcase Abstracts
... Evidence of past co-seismic landslides have either be covered up by sediment or vegetation or has been eroded away so their remains cannot be seen in present day landscapes. These areas have become more populated in recent years and if an earthquake were to occur the losses would be even greater tha ...
... Evidence of past co-seismic landslides have either be covered up by sediment or vegetation or has been eroded away so their remains cannot be seen in present day landscapes. These areas have become more populated in recent years and if an earthquake were to occur the losses would be even greater tha ...
Journal of Asian Earth Sciences 20 2002
... measurements and present seismicity illustrate the high rates of motions and tectonic complexity of the region, but provide little help in longterm reconstruction. Plate boundaries shifted rapidly in the Cenozoic. During convergence of the major plates, there were numerous important episodes of exte ...
... measurements and present seismicity illustrate the high rates of motions and tectonic complexity of the region, but provide little help in longterm reconstruction. Plate boundaries shifted rapidly in the Cenozoic. During convergence of the major plates, there were numerous important episodes of exte ...
Cenozoic geological and plate tectonic evolution of SE Asia and the
... measurements and present seismicity illustrate the high rates of motions and tectonic complexity of the region, but provide little help in longterm reconstruction. Plate boundaries shifted rapidly in the Cenozoic. During convergence of the major plates, there were numerous important episodes of exte ...
... measurements and present seismicity illustrate the high rates of motions and tectonic complexity of the region, but provide little help in longterm reconstruction. Plate boundaries shifted rapidly in the Cenozoic. During convergence of the major plates, there were numerous important episodes of exte ...
8 Multiple plate collisions and the end of the Iapetus Ocean
... 8.3.2 Magmatism and the timing of deformation A series of intrusive bodies are found above and below the Naver Thrust. These occur as a series of branching sheets and lenses that are sub-concordant with the major thrust planes. They comprise medium- to coarse-grained granites, granodiorites and dior ...
... 8.3.2 Magmatism and the timing of deformation A series of intrusive bodies are found above and below the Naver Thrust. These occur as a series of branching sheets and lenses that are sub-concordant with the major thrust planes. They comprise medium- to coarse-grained granites, granodiorites and dior ...
2. - Teacher Friendly Guides
... detailed sequence of rocks for the history that has gone on under our feet. What is not possible from only one location is making sense of why this particular sequence of events took place when and where it did, particularly relative to sequences in other places around it. The distribution of rocks ...
... detailed sequence of rocks for the history that has gone on under our feet. What is not possible from only one location is making sense of why this particular sequence of events took place when and where it did, particularly relative to sequences in other places around it. The distribution of rocks ...
TOPIC:EVOLUTION OF THE SOUTHERN ALPS AND DOLOMITES
... Hauptdolomit platform. While cooling and embrittlement of the thinned crust, extension began to concentrate in the western parts of the Southern Alps. Lower crustal (Canavese zone) and mantle rocks (Piemont zone) were exhumed to the seafloor within a system of lowangle detachment faults (BERNOULLI ...
... Hauptdolomit platform. While cooling and embrittlement of the thinned crust, extension began to concentrate in the western parts of the Southern Alps. Lower crustal (Canavese zone) and mantle rocks (Piemont zone) were exhumed to the seafloor within a system of lowangle detachment faults (BERNOULLI ...
Geology, age and field relations of Hadean zircon-bearing
... Quad Creek Paleoarchean (≤3250 Ma) quartzites in southern Montana host Hadean (pre-3850 Ma) detrital zircons. Although an accessible resource for investigating early Earth processes distinct from other better known ancient zircon localities, the outcrop-scale geological and geochemical context of th ...
... Quad Creek Paleoarchean (≤3250 Ma) quartzites in southern Montana host Hadean (pre-3850 Ma) detrital zircons. Although an accessible resource for investigating early Earth processes distinct from other better known ancient zircon localities, the outcrop-scale geological and geochemical context of th ...
as a PDF
... because it does not differ significantly, at least since c. 90 Ma, from more recent ‘moving hot spot’ reference frames. The Caribbean oceanic lithosphere has moved little relative to the hot spots in the Cenozoic, but moved north at c. 50 km/Ma during the Cretaceous, while the American plates have d ...
... because it does not differ significantly, at least since c. 90 Ma, from more recent ‘moving hot spot’ reference frames. The Caribbean oceanic lithosphere has moved little relative to the hot spots in the Cenozoic, but moved north at c. 50 km/Ma during the Cretaceous, while the American plates have d ...
Geologica: Earth`s Dynamic Forces by Robert Coenraads and John I
... Earthquakes are the shaking, rolling or sudden shock of the earth’s surface. They are the Earth's natural means of releasing stress. More than a million earthquakes rattle the world each year. The West Coast is most at risk of having an earthquake in the United States, but earthquakes can happen in ...
... Earthquakes are the shaking, rolling or sudden shock of the earth’s surface. They are the Earth's natural means of releasing stress. More than a million earthquakes rattle the world each year. The West Coast is most at risk of having an earthquake in the United States, but earthquakes can happen in ...
Chapter 8
... Plate Tectonics and Metamorphism Higher temperatures and pressures existing at depth within ...
... Plate Tectonics and Metamorphism Higher temperatures and pressures existing at depth within ...
Kansas 4-H Geology Leader Notebook
... Next we will look at soil particles that come from rocks. Look at these three piles — what do they look like? Which pile has the smallest pieces? Next smallest? Largest pieces? Which soil particles are most like the cooking items found around the house? Now, let’s look at three different rocks. Thes ...
... Next we will look at soil particles that come from rocks. Look at these three piles — what do they look like? Which pile has the smallest pieces? Next smallest? Largest pieces? Which soil particles are most like the cooking items found around the house? Now, let’s look at three different rocks. Thes ...
Heterogeneous crustal deformation along the central-northern
... the central part around the Gofukuji Fault does not have so much shortening. Rather, left-lateral shear deformation seems dominant in this area. It is worthwhile to point out that we do not detect significant vertical deformation at the majority of the stations. However, there are two sites showing ...
... the central part around the Gofukuji Fault does not have so much shortening. Rather, left-lateral shear deformation seems dominant in this area. It is worthwhile to point out that we do not detect significant vertical deformation at the majority of the stations. However, there are two sites showing ...
accepted manuscript
... and brought back to the surface. Consequently, if the UHP depth estimates are valid (e.g., Spear, 1993), the HP/UHP rocks can be regarded as passive markers of continental subduction and their P-T-t paths can be used for reconstruction of subduction dynamics and of the conditions at the subduction i ...
... and brought back to the surface. Consequently, if the UHP depth estimates are valid (e.g., Spear, 1993), the HP/UHP rocks can be regarded as passive markers of continental subduction and their P-T-t paths can be used for reconstruction of subduction dynamics and of the conditions at the subduction i ...
Baltica upside down: A new plate tectonic model for Rodinia and the
... Greenland with sandstones, shales, limestones, and dolomites, and correlate on a bed-to-bed basis for more than 1000 km in East Greenland and directly across to Svalbard (Haller, 1971; Henriksen and Higgins, 1976). Barentia (central and eastern Svalbard) is thus inferred to have been located offshor ...
... Greenland with sandstones, shales, limestones, and dolomites, and correlate on a bed-to-bed basis for more than 1000 km in East Greenland and directly across to Svalbard (Haller, 1971; Henriksen and Higgins, 1976). Barentia (central and eastern Svalbard) is thus inferred to have been located offshor ...
The discovery of a conjugate system of faults in the Wharton Basin
... or strike-slip boundaries. The deformation along these plate boundaries is controlled by the motion between the plates, evidenced by the occurrence of different types of earthquakes. For example, normal faulting earthquakes are generally produced at divergent plate boundaries, whereas dominantly thr ...
... or strike-slip boundaries. The deformation along these plate boundaries is controlled by the motion between the plates, evidenced by the occurrence of different types of earthquakes. For example, normal faulting earthquakes are generally produced at divergent plate boundaries, whereas dominantly thr ...
Plate Tectonic Evolution and Mineral Resource
... identical to the continental flood basalts of the Emeishan Large Igneous Province (LIP), which are proposed to be mantle-plume related (Xu et al., 2001; Chung, 1998). Hence, the new plate tectonic model excludes a Mesozoic island-arc setting and expectations of finding large-scale Au-bearing porphyr ...
... identical to the continental flood basalts of the Emeishan Large Igneous Province (LIP), which are proposed to be mantle-plume related (Xu et al., 2001; Chung, 1998). Hence, the new plate tectonic model excludes a Mesozoic island-arc setting and expectations of finding large-scale Au-bearing porphyr ...
Large igneous province
A large igneous province (LIP) is an extremely large accumulation of igneous rocks, including liquid rock (intrusive) or volcanic rock formations (extrusive), when hot magma extrudes from inside the Earth and flows out. The source of many or all LIPs is variously attributed to mantle plumes or to processes associated with plate tectonics. Types of LIPs can include large volcanic provinces (LVP), created through flood basalt and large plutonic provinces (LPP). Eleven distinct flood basalt episodes occurred in the past 250 million years, creating volcanic provinces, which coincided with mass extinctions in prehistoric times. Formation depends on a range of factors, such as continental configuration, latitude, volume, rate, duration of eruption, style and setting (continental vs. oceanic), the preexisting climate state, and the biota resilience to change.