M44-2003-A4-eng - Publications du gouvernement du Canada
... broad belt of Lower Cretaceous (Valanginian, in part) volcanosedimentary rocks, within a northwest-trending corridor that coincides roughly with the western boundary of Tweedsmuir Provincial Park. Also within this corridor, an unconformable contact between Middle Jurassic and Lower Cretaceous strata ...
... broad belt of Lower Cretaceous (Valanginian, in part) volcanosedimentary rocks, within a northwest-trending corridor that coincides roughly with the western boundary of Tweedsmuir Provincial Park. Also within this corridor, an unconformable contact between Middle Jurassic and Lower Cretaceous strata ...
Lecture 2: Before we get to PLATE TECTONICS…..
... disposed in symmetrical stripes paralleling the oceanic ridges. This indicates that new oceanic crust must be formed along the spreading ridges. ...
... disposed in symmetrical stripes paralleling the oceanic ridges. This indicates that new oceanic crust must be formed along the spreading ridges. ...
Hot Spots or Extension? - Department of Geology
... – Both have been used as explanations for the presence of volcanics. In some cases, actual evidence exists, in others not. Both produce “OIB”s, so the presence of OIBs is ambivalent. The two are interrelated – hot spots beget triple junctions and extension, but not all extension is due to hot spots. ...
... – Both have been used as explanations for the presence of volcanics. In some cases, actual evidence exists, in others not. Both produce “OIB”s, so the presence of OIBs is ambivalent. The two are interrelated – hot spots beget triple junctions and extension, but not all extension is due to hot spots. ...
mcrinterpslide - Northwestern University
... This density difference has a huge consequence for how the earth works. Because the continents are made up of less dense granite, they are higher than the denser basalt rocks under the oceans. The continents “float” above the denser basalt, just the way wood floats in water because it’s less dense. ...
... This density difference has a huge consequence for how the earth works. Because the continents are made up of less dense granite, they are higher than the denser basalt rocks under the oceans. The continents “float” above the denser basalt, just the way wood floats in water because it’s less dense. ...
Subduction and Mountain Building Andean
... • Older Paleozoic- and Precambrian-age mountains • The Appalachians • The Urals in Russia ...
... • Older Paleozoic- and Precambrian-age mountains • The Appalachians • The Urals in Russia ...
Three‐dimensional field perspective on deformation, flow, and
... [1] The study of fabric development and juvenile batholith emplacement across the tilted crustal section of the Eastern Dharwar craton shows that horizontal, constrictional deformation affected large volumes of the midcrust and lower crust at the time of regional partial melting and magmatic accreti ...
... [1] The study of fabric development and juvenile batholith emplacement across the tilted crustal section of the Eastern Dharwar craton shows that horizontal, constrictional deformation affected large volumes of the midcrust and lower crust at the time of regional partial melting and magmatic accreti ...
Chapter 11 Section 2
... Appalachians, do not lie along active convergent plate boundaries. However, evidence indicates that the places at which these ranges formed were previously active plate boundaries. ...
... Appalachians, do not lie along active convergent plate boundaries. However, evidence indicates that the places at which these ranges formed were previously active plate boundaries. ...
No Slide Title
... The Effects on Global Climates and Ocean Circulation Patterns • By the end of the Permian Period, – Pangaea extended from pole to pole, – covered about one-fourth of Earth's surface, – and was surrounded by Panthalassa, • a global ocean that encompassed about 300 degrees of ...
... The Effects on Global Climates and Ocean Circulation Patterns • By the end of the Permian Period, – Pangaea extended from pole to pole, – covered about one-fourth of Earth's surface, – and was surrounded by Panthalassa, • a global ocean that encompassed about 300 degrees of ...
deep-ocean trench
... What are plates & plate boundaries? •Plates are the pieces the crust is broken into. •The edges of these pieces are called boundaries . •Cracks in the crust along these boundaries are called faults. ...
... What are plates & plate boundaries? •Plates are the pieces the crust is broken into. •The edges of these pieces are called boundaries . •Cracks in the crust along these boundaries are called faults. ...
PDF - UCSB Earth Science - University of California, Santa Barbara
... Eocene pulse in LVC rocks, and Late Eocene to Oligocene and Early Miocene pulses that correspond to the two ignimbrite flare-ups (UVC). The earliest event is the least well understood, in terms of its structural setting, but the younger two are clearly controlled by normal faults and transfer zones. ...
... Eocene pulse in LVC rocks, and Late Eocene to Oligocene and Early Miocene pulses that correspond to the two ignimbrite flare-ups (UVC). The earliest event is the least well understood, in terms of its structural setting, but the younger two are clearly controlled by normal faults and transfer zones. ...
1 Ocean-Continent Convergent Plate Boundaries
... If the magma at a continental arc is felsic, it may be too viscous (thick) to rise through the crust. The magma will cool slowly to form granite or granodiorite. These large bodies of intrusive igneous rocks are called batholiths, ...
... If the magma at a continental arc is felsic, it may be too viscous (thick) to rise through the crust. The magma will cool slowly to form granite or granodiorite. These large bodies of intrusive igneous rocks are called batholiths, ...
Mineral deposits and structurral pattern of the Big Burro Mountains
... Burro Mountain block, but includes many roof pendants and pods of older metamorphic rocks. Intrusive plugs or stocks are absent. It is believed to represent a higher part of the batholith than that which occupies the central Big Burro Mountains. Within the Big Burro Mountain block, faulting and frac ...
... Burro Mountain block, but includes many roof pendants and pods of older metamorphic rocks. Intrusive plugs or stocks are absent. It is believed to represent a higher part of the batholith than that which occupies the central Big Burro Mountains. Within the Big Burro Mountain block, faulting and frac ...
Ocean Crust - The University of Southern Mississippi
... Basalt is a dark colored igneous rock made of Fe- and Mg-rich minerals and plagioclase feldspar. ...
... Basalt is a dark colored igneous rock made of Fe- and Mg-rich minerals and plagioclase feldspar. ...
Sr–Nd isotope geochemistry and tectonomagmatic setting of the
... High Sr/Y and La/Yb ratios of Dehsalm intrusives reveal that, despite their K-rich composition, these granitoids show some resemblances with adakitic rocks. A Rb–Sr whole rock–feldspar–biotite age of 33 ± 1 Ma was obtained in a quartz monzonite sample and coincides, within error, with a previous geo ...
... High Sr/Y and La/Yb ratios of Dehsalm intrusives reveal that, despite their K-rich composition, these granitoids show some resemblances with adakitic rocks. A Rb–Sr whole rock–feldspar–biotite age of 33 ± 1 Ma was obtained in a quartz monzonite sample and coincides, within error, with a previous geo ...
San Andreas Fault Trail – A Self
... coastal range where ponds are found: fault zones and landslide areas. This is because over time erosion occurs, filling in depressions and ponds. So, when one sees a pond in this area one knows it must have been created fairly recently. In this case, by the 1906 earthquake. Sag ponds like this one i ...
... coastal range where ponds are found: fault zones and landslide areas. This is because over time erosion occurs, filling in depressions and ponds. So, when one sees a pond in this area one knows it must have been created fairly recently. In this case, by the 1906 earthquake. Sag ponds like this one i ...
GEOLOGIC MAP OF THE RED LODGE AREA, CARBON COUNTY
... longer exists but was about 1 mile east-southeast of Luther). These rocks occur along the northern mountain front of the Beartooth Uplift (Calvert, 1916; Jobling, 1974; DeCelles and others, 1991) and are considered to be Laramide synorogenic deposits. Similar rocks occur along the eastern front of t ...
... longer exists but was about 1 mile east-southeast of Luther). These rocks occur along the northern mountain front of the Beartooth Uplift (Calvert, 1916; Jobling, 1974; DeCelles and others, 1991) and are considered to be Laramide synorogenic deposits. Similar rocks occur along the eastern front of t ...
The Shatter Zone: A Physical Borderland from 420 Million Years Ago
... composition between granite and gabbro. This area of diorite would fifty years later become critical in understanding the connection between the granite, the shatter zone, and volcanic activity at the surface. Carleton Chapman in 1953 in an abstract entitled “Cauldron Subsidence at Mount Desert Is ...
... composition between granite and gabbro. This area of diorite would fifty years later become critical in understanding the connection between the granite, the shatter zone, and volcanic activity at the surface. Carleton Chapman in 1953 in an abstract entitled “Cauldron Subsidence at Mount Desert Is ...
Geology of Greenland Survey Bulletin 177, 89-95
... itself nor in its underlying mantle. This is true for the regions of Early Archaean Amîtsoq gneiss within the Akulleq terrane immediately adjacent to the Akia terrane (e.g. McGregor et al., 1991) and is also well documented in other, younger parts of the Archaean block of southern West Greenland (se ...
... itself nor in its underlying mantle. This is true for the regions of Early Archaean Amîtsoq gneiss within the Akulleq terrane immediately adjacent to the Akia terrane (e.g. McGregor et al., 1991) and is also well documented in other, younger parts of the Archaean block of southern West Greenland (se ...
Normal faults Normal faults
... A note on fault populations • Power law distribution for number of faults in a rift system ...
... A note on fault populations • Power law distribution for number of faults in a rift system ...
Answer key for the note sheet.
... b. Root Action: Roots grow and force cracks in rock to widen. c. Abrasion: Scraping rocks – happens during erosion. Wind blown sand into larger rocks (ventifacts) or water pushing stones along a stream bed causing the rocks to have a rounded shape. d. Exfoliation: Due to variations in seasonal tempe ...
... b. Root Action: Roots grow and force cracks in rock to widen. c. Abrasion: Scraping rocks – happens during erosion. Wind blown sand into larger rocks (ventifacts) or water pushing stones along a stream bed causing the rocks to have a rounded shape. d. Exfoliation: Due to variations in seasonal tempe ...
the cretaceous sanfranciscan basin, eastern plateau of
... Bouguer anomaly data reported by Hasui and Haralyi (1991) indicate the presence of important lineaments of a NW/SE set, crossing the southwestern half of the arch. The tectonic development was aborted during the Late Cretaceous and the basin is now elevated at about 1100-1150m. At the north, in the ...
... Bouguer anomaly data reported by Hasui and Haralyi (1991) indicate the presence of important lineaments of a NW/SE set, crossing the southwestern half of the arch. The tectonic development was aborted during the Late Cretaceous and the basin is now elevated at about 1100-1150m. At the north, in the ...
Chapter 2 PPT
... Accurate measurements for small, nearby earthquakes not large, distant earthquakes ...
... Accurate measurements for small, nearby earthquakes not large, distant earthquakes ...
kamchatka
... crystallization took place at one time with a sharp increase of oxygen fugacity up to 1.5-2 log units above the NNO. Simultaneously, the melt reached near water-saturated conditions. These results suggest the following model: During the initial period of the young cone formation, its magma feeding s ...
... crystallization took place at one time with a sharp increase of oxygen fugacity up to 1.5-2 log units above the NNO. Simultaneously, the melt reached near water-saturated conditions. These results suggest the following model: During the initial period of the young cone formation, its magma feeding s ...
USGS: The Interior of the Earth
... Three centuries ago, the English scientist Isaac Newton calculated, from his studies of planets and the force of gravity, that the average density of the Earth is twice that of surface rocks and therefore that the Earth's interior must be composed of much denser material. Our knowledge of what's ins ...
... Three centuries ago, the English scientist Isaac Newton calculated, from his studies of planets and the force of gravity, that the average density of the Earth is twice that of surface rocks and therefore that the Earth's interior must be composed of much denser material. Our knowledge of what's ins ...
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.