The Mogollon-Datil volcanic field, southwestern New Mexico
... periods was strong evidence for the then-disputed magmatic origin of granite, a problem fundamental to understanding the origin and nature of continents. During a proposed extensional orogeny, volcanism of the North American ignimbrite province began in the continental back arc of an ocean-to-contin ...
... periods was strong evidence for the then-disputed magmatic origin of granite, a problem fundamental to understanding the origin and nature of continents. During a proposed extensional orogeny, volcanism of the North American ignimbrite province began in the continental back arc of an ocean-to-contin ...
Generation of high-silica rhyolite: A Nd, Sr, and O isotopic study of
... all erupted within a period shorter than 5-10 ky. About 75 ky ago, a new group of ring domes (e.g., Sample 174) erupted at the southern margin of the lake. Subsequent uplift due to magmatic insurgence caused the lake to drain and culminated about 60 ky ago in eruption of aphyric lavas (e.g., Sample ...
... all erupted within a period shorter than 5-10 ky. About 75 ky ago, a new group of ring domes (e.g., Sample 174) erupted at the southern margin of the lake. Subsequent uplift due to magmatic insurgence caused the lake to drain and culminated about 60 ky ago in eruption of aphyric lavas (e.g., Sample ...
PDF
... initially characterized by tonalite–trondhjemite–granodiorite (TTG) and granite (monzogranite, syenogranite), but also characterized, from 610 Ma on, by increasing amounts of alkali-feldspar granite and alkali granite. The plutons are largely undeformed, except where cut by brittle–ductile shear zo ...
... initially characterized by tonalite–trondhjemite–granodiorite (TTG) and granite (monzogranite, syenogranite), but also characterized, from 610 Ma on, by increasing amounts of alkali-feldspar granite and alkali granite. The plutons are largely undeformed, except where cut by brittle–ductile shear zo ...
Table of Contents
... Partial support for this work was provided by the National Science Foundation's Course, Curriculum, and Laboratory Improvement (CCLI) program underAward No. 0837185. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily ...
... Partial support for this work was provided by the National Science Foundation's Course, Curriculum, and Laboratory Improvement (CCLI) program underAward No. 0837185. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily ...
A Comparative Study of the Badger Pass Igneous Intrusion and the
... Strong geochemical evidence suggests that the intrusive rocks of the two areas are consanguineous. The striking similarity of the geochemical fingerprints of all the rocks, supported by field relationships observed through detailed field mapping, is further used to propose the temporal relationship ...
... Strong geochemical evidence suggests that the intrusive rocks of the two areas are consanguineous. The striking similarity of the geochemical fingerprints of all the rocks, supported by field relationships observed through detailed field mapping, is further used to propose the temporal relationship ...
Here - ScienceA2Z.com
... which the spreading and extension occurs along the narrow rift zone along the ridge crest. To demonstrate the concepts of a divergent plate boundary and mid-ocean ridge spreading centers, begin by placing the two 20 x 20 cm foam pieces on the base (Figure 3B) with one edge adjoined at the ridge cres ...
... which the spreading and extension occurs along the narrow rift zone along the ridge crest. To demonstrate the concepts of a divergent plate boundary and mid-ocean ridge spreading centers, begin by placing the two 20 x 20 cm foam pieces on the base (Figure 3B) with one edge adjoined at the ridge cres ...
Spectrum of Fault Slip Behavior
... Seismic and Aseismic Faulting: End Members of a Continuous Spectrum of Behaviors What causes this range of behaviors? One (earthquake) mechanism, or several? How best do we describe the rheology of brittle fault zones? ...
... Seismic and Aseismic Faulting: End Members of a Continuous Spectrum of Behaviors What causes this range of behaviors? One (earthquake) mechanism, or several? How best do we describe the rheology of brittle fault zones? ...
Comparative Study of Quaternary Arc Volcanic Belts: Southern Chile
... volcanic rocks. The mantle process seems to be related to the rock-series of frontal basalts and across-arc variation of alkaline content or rock-series of basalts. While, the condition of crustal stress field may be important for the occurrence of large calderas with voluminous felsic pyroclastic f ...
... volcanic rocks. The mantle process seems to be related to the rock-series of frontal basalts and across-arc variation of alkaline content or rock-series of basalts. While, the condition of crustal stress field may be important for the occurrence of large calderas with voluminous felsic pyroclastic f ...
the geology of the olifants river area, transvaal
... The major portion of the area is inhabited by Bantu who live either in locations or on property of the Bantu Trust. The only white people in these areas are missionaries, storekeepers and officials of the Department of Bantu Administration and Development. The Bantu keep large herds of goats, cattle ...
... The major portion of the area is inhabited by Bantu who live either in locations or on property of the Bantu Trust. The only white people in these areas are missionaries, storekeepers and officials of the Department of Bantu Administration and Development. The Bantu keep large herds of goats, cattle ...
Yogo_et_al._Slab Edg.. - UNC
... northward migration of the Mendocino triple junction in the Neogene. In Costa Rica, adakite genesis has been linked to the melting of young and hot lithosphere during subduction of an extinct segment of the Galapagos spreading centre19, but if adakites can also form by melting along the edges of pla ...
... northward migration of the Mendocino triple junction in the Neogene. In Costa Rica, adakite genesis has been linked to the melting of young and hot lithosphere during subduction of an extinct segment of the Galapagos spreading centre19, but if adakites can also form by melting along the edges of pla ...
the karuah bypass - Australian Geomechanics Society
... intense faulting of many types. As a consequence, the stratigraphy and structure has been the subject of research for over 150 years and is still being unravelled. The earliest work within the area was undertaken by Strzelecki (1845). David (1907), Benson (1913) and Sussmilch and David (1919) were t ...
... intense faulting of many types. As a consequence, the stratigraphy and structure has been the subject of research for over 150 years and is still being unravelled. The earliest work within the area was undertaken by Strzelecki (1845). David (1907), Benson (1913) and Sussmilch and David (1919) were t ...
Towards a Creationist Explanation of Regional
... The metasedimentary sheaths surrounding stratiform sulfide orebodies have facilitated the study of regional metamorphic processes on a much smaller scale. Such orebodies were produced by hydrothermal waters disgorging both sulfides and a variety of other minerals and chemicals onto the sea-floor, where ...
... The metasedimentary sheaths surrounding stratiform sulfide orebodies have facilitated the study of regional metamorphic processes on a much smaller scale. Such orebodies were produced by hydrothermal waters disgorging both sulfides and a variety of other minerals and chemicals onto the sea-floor, where ...
Discovering the mysteries of earthquakes
... could cause huge earthquakes at any moment. The project in New Zealand is called the Deep Fault Drilling Project. Thurber and Tobin are part of a group of scientists studying the Alpine Fault there. The New Zealand fault has been quiet since 1717. It causes a major quake every 300 or 400 years. Scie ...
... could cause huge earthquakes at any moment. The project in New Zealand is called the Deep Fault Drilling Project. Thurber and Tobin are part of a group of scientists studying the Alpine Fault there. The New Zealand fault has been quiet since 1717. It causes a major quake every 300 or 400 years. Scie ...
Helium - Adrian Jones - Deep Carbon Observatory
... groundwater and to time the rise of continents1. The hydrothermal system at Yellowstone National Park is famous for its high helium-3/helium-4 isotope ratio, commonly cited as evidence for a deep mantle source for the Yellowstone hotspot2. However, much of the helium emitted from this region is actu ...
... groundwater and to time the rise of continents1. The hydrothermal system at Yellowstone National Park is famous for its high helium-3/helium-4 isotope ratio, commonly cited as evidence for a deep mantle source for the Yellowstone hotspot2. However, much of the helium emitted from this region is actu ...
Sea Floor Spreading powerpoint
... under-water objects and then records the echoes of these sound waves. The time it takes for the echo to arrive indicates the distance to the object. ...
... under-water objects and then records the echoes of these sound waves. The time it takes for the echo to arrive indicates the distance to the object. ...
Sea-Floor Spreading - Moore Middle School PTSA
... under-water objects and then records the echoes of these sound waves. The time it takes for the echo to arrive indicates the distance to the object. ...
... under-water objects and then records the echoes of these sound waves. The time it takes for the echo to arrive indicates the distance to the object. ...
Amphibious Array Arctic Beaufort Sea RoyOct7
... The northerly thrust motion over the Beaufort Sea is interpreted to be driven by the Yakutat terrane collision in the Gulf of Alaska (see Steep Project) 1000 km to the southwest (e.g., Mazzotti and Hyndman, 2002) (Figure 5). Crustal temperatures are concluded to be hot enough in the northern Cordill ...
... The northerly thrust motion over the Beaufort Sea is interpreted to be driven by the Yakutat terrane collision in the Gulf of Alaska (see Steep Project) 1000 km to the southwest (e.g., Mazzotti and Hyndman, 2002) (Figure 5). Crustal temperatures are concluded to be hot enough in the northern Cordill ...
Lone Pine Area - Geologic Trips
... The Alabama Hills are famous for the scenic rounded rocks that have formed the backdrop for some 200 movies and many television programs. The rocks of the Alabama Hills are the same granitic and metamorphic rocks that occur in the Sierra Nevada. However, the granite in the Alabama Hills is not clean ...
... The Alabama Hills are famous for the scenic rounded rocks that have formed the backdrop for some 200 movies and many television programs. The rocks of the Alabama Hills are the same granitic and metamorphic rocks that occur in the Sierra Nevada. However, the granite in the Alabama Hills is not clean ...
Click here to the FieldTrip Guide
... sharply contrasts with that of domains to the west (inland), with several exposures of older basement, older crust formation age (Nd TDM > 2.0 Ga), more unradiogenic Pb and low time-integrated Rb/Sr (Basei et al., 2008; Florisbal et al., 2012). Although the age of collision between the FPAB and the ...
... sharply contrasts with that of domains to the west (inland), with several exposures of older basement, older crust formation age (Nd TDM > 2.0 Ga), more unradiogenic Pb and low time-integrated Rb/Sr (Basei et al., 2008; Florisbal et al., 2012). Although the age of collision between the FPAB and the ...
Hot mantle drives elevation, volcanism along mid-ocean
... Science, shed new light on how temperature in the depths of the mantle influences the contours of the The mid-ocean ridges provide geologists with a Earth's crust. window to the interior of the Earth. The ridges form when mantle material melts, rises into the cracks Mid-ocean ridges form at the boun ...
... Science, shed new light on how temperature in the depths of the mantle influences the contours of the The mid-ocean ridges provide geologists with a Earth's crust. window to the interior of the Earth. The ridges form when mantle material melts, rises into the cracks Mid-ocean ridges form at the boun ...
Continents in Motion: The Search for a Unifying Theory
... ( ● Fig. 13.25). Tectonics involves large-scale forces originating within Earth that cause parts of the lithosphere to move around. In plate tectonics, the lithospheric plates move as distinct and discrete units. In some places they pull away from each other (diverge), in other places they push toge ...
... ( ● Fig. 13.25). Tectonics involves large-scale forces originating within Earth that cause parts of the lithosphere to move around. In plate tectonics, the lithospheric plates move as distinct and discrete units. In some places they pull away from each other (diverge), in other places they push toge ...
PRESIDENTIAL ADDRESS Patterns of mineral
... ages is greater than the duration of contact metamorphism, the ages of Mnz from the And and sillimanite (Sil) zones of contact aureoles test the prediction that they date the age of the And isograd. Specifically, if these monazites formed during metamorphism, their isotopic age should match the crys ...
... ages is greater than the duration of contact metamorphism, the ages of Mnz from the And and sillimanite (Sil) zones of contact aureoles test the prediction that they date the age of the And isograd. Specifically, if these monazites formed during metamorphism, their isotopic age should match the crys ...
DaVince Tools Generated PDF File
... 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 time. La ...
... 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 time. La ...
Copper - Department of Natural Resources
... that the most prospective rocks are those that have an arc signature and which also most likely developed during periods of arc rifting. Ophiolitic volcanic-hosted environments are found predominantly within the sheeted dyke and overlying pillow lava components of the ophiolite complexes, most of wh ...
... that the most prospective rocks are those that have an arc signature and which also most likely developed during periods of arc rifting. Ophiolitic volcanic-hosted environments are found predominantly within the sheeted dyke and overlying pillow lava components of the ophiolite complexes, most of wh ...
Algoman orogeny
The Algoman orogeny, known as the Kenoran orogeny in Canada, was an episode of mountain-building (orogeny) during the Late Archean Eon that involved repeated episodes of continental collisions, compressions and subductions. The Superior province and the Minnesota River Valley terrane collided about 2,700 to 2,500 million years ago. The collision folded the Earth's crust and produced enough heat and pressure to metamorphose the rock. Blocks were added to the Superior province along a 1,200 km (750 mi) boundary that stretches from present-day eastern South Dakota into the Lake Huron area. The Algoman orogeny brought the Archaen Eon to a close, about 2,500 million years ago; it lasted less than 100 million years and marks a major change in the development of the earth’s crust.The Canadian shield contains belts of metavolcanic and metasedimentary rocks formed by the action of metamorphism on volcanic and sedimentary rock. The areas between individual belts consist of granites or granitic gneisses that form fault zones. These two types of belts can be seen in the Wabigoon, Quetico and Wawa subprovinces; the Wabigoon and Wawa are of volcanic origin and the Quetico is of sedimentary origin. These three subprovinces lie linearly in southwestern- to northeastern-oriented belts about 140 km (90 mi) wide on the southern portion of the Superior Province.The Slave province and portions of the Nain province were also affected. Between about 2,000 and 1,700 million years ago these combined with the Sask and Wyoming cratons to form the first supercontinent, the Kenorland supercontinent.