Gold, Silver, and Copper Metallogeny of the Eastern Sunda
... (30.1 million ounces of gold and 19 billion pounds of copper), the Eastern Sunda Arc has continued to prove itself as an emerging economically important magmatic belt. This paper provides a general description of the metallogeny of the Eastern Sunda Arc, covering a wide spectrum of topics, from its ...
... (30.1 million ounces of gold and 19 billion pounds of copper), the Eastern Sunda Arc has continued to prove itself as an emerging economically important magmatic belt. This paper provides a general description of the metallogeny of the Eastern Sunda Arc, covering a wide spectrum of topics, from its ...
Subduction cycles under western North America during the
... strain, ranging from less than a few million years to some tens of million years in length. The primary goal of this chapter is to summarize the major geologic events in western North America since the beginning of the Triassic period that bear on the interactions of oceanic plates in the northeast ...
... strain, ranging from less than a few million years to some tens of million years in length. The primary goal of this chapter is to summarize the major geologic events in western North America since the beginning of the Triassic period that bear on the interactions of oceanic plates in the northeast ...
Geofile 2016-3 synopsis - Ministry of Energy and Mines
... Geofile 2016-3 contains the results, methodology and quality control data from geochronological analyses of samples collected during fieldwork conducted as part of the Southern Nicola Arc Project (SNAP, Mihalynuk and Logan 2013a, b; Mihalynuk et al., 2014a, b, c; Mihalynuk et al., 2015; Mihalynuk et ...
... Geofile 2016-3 contains the results, methodology and quality control data from geochronological analyses of samples collected during fieldwork conducted as part of the Southern Nicola Arc Project (SNAP, Mihalynuk and Logan 2013a, b; Mihalynuk et al., 2014a, b, c; Mihalynuk et al., 2015; Mihalynuk et ...
volcanological and tectonic insights into geothermal systems
... The TVZ began erupting around 2 Ma, with early andesitic volcanism being joined and swamped around 1.6 Ma by voluminous rhyolitic volcanism (Wilson et al., 1995). At least 10,000 km3 o f overwhelmingly rhyolitic magma has been erupted in the past 1.6 Myr, but the eruption records from terrestrial an ...
... The TVZ began erupting around 2 Ma, with early andesitic volcanism being joined and swamped around 1.6 Ma by voluminous rhyolitic volcanism (Wilson et al., 1995). At least 10,000 km3 o f overwhelmingly rhyolitic magma has been erupted in the past 1.6 Myr, but the eruption records from terrestrial an ...
09_chapter 1
... giant “plume head” that rose from the core mantle boundary. This plume head was anchored to the source by long tail that created the Chagos-Laccadive volcanic chain. A jump of a ridge that is now the Central Indian Ridge about 40 million years ago broke up the chain and the original plume tail is no ...
... giant “plume head” that rose from the core mantle boundary. This plume head was anchored to the source by long tail that created the Chagos-Laccadive volcanic chain. A jump of a ridge that is now the Central Indian Ridge about 40 million years ago broke up the chain and the original plume tail is no ...
d ated 2010
... Titanomagnetite microphenocrysts have been oXldlsed to an aggregate of magnetite and ilmenite, the latter forming intersecting plates. Further reacti~n involves ~he formation of sphene after ilmenite, but with the replacIng mineral retaining the ~ross-hatched distribution. Pseudomorphs after titanom ...
... Titanomagnetite microphenocrysts have been oXldlsed to an aggregate of magnetite and ilmenite, the latter forming intersecting plates. Further reacti~n involves ~he formation of sphene after ilmenite, but with the replacIng mineral retaining the ~ross-hatched distribution. Pseudomorphs after titanom ...
DNR Yakima Fold Belt Reidel and Campbell
... River-Naches River fault zone is a major fault zone and is aligned with this 50-km-long Naches-Little Naches val¬ley system that separates two terranes of dissimilar structure, stratigraphy, and topography (Campbell, 1988). Northeast of the White River-Naches River fault zone, faults and folds in pr ...
... River-Naches River fault zone is a major fault zone and is aligned with this 50-km-long Naches-Little Naches val¬ley system that separates two terranes of dissimilar structure, stratigraphy, and topography (Campbell, 1988). Northeast of the White River-Naches River fault zone, faults and folds in pr ...
A Geoelectric Model of the Cascadia Subduction Zone
... Almost the entire Juan de Fuca plate is covered by magnetic variation (MV) observations with a spacing of 50 to 100 km. Magnetotelluric soundings (MTS) were perIZVESTIYA, PHYSICS OF THE SOLID EARTH ...
... Almost the entire Juan de Fuca plate is covered by magnetic variation (MV) observations with a spacing of 50 to 100 km. Magnetotelluric soundings (MTS) were perIZVESTIYA, PHYSICS OF THE SOLID EARTH ...
Cenozoic magmatism in the western Ross Embayment:
... between the circular symmetry expected for a plume stressinduced perturbation and the surface linear expression of rifts [Tommasi and Vauchez, 2001]. Thus, the question about the causal relationships between plumes and extension is matter of debate. Indeed, since the original proposals of Wilson [19 ...
... between the circular symmetry expected for a plume stressinduced perturbation and the surface linear expression of rifts [Tommasi and Vauchez, 2001]. Thus, the question about the causal relationships between plumes and extension is matter of debate. Indeed, since the original proposals of Wilson [19 ...
Geological Activity from Plate Tectonics Processes
... crust or at the surface? What if the stress applied is sharp rather than gradual? • At the Earth’s surface, rocks usually break quite quickly, but deeper in the crust, where temperatures and pressures are higher, rocks are more likely to deform plastically. • Sudden stress, such as a hit with a hamm ...
... crust or at the surface? What if the stress applied is sharp rather than gradual? • At the Earth’s surface, rocks usually break quite quickly, but deeper in the crust, where temperatures and pressures are higher, rocks are more likely to deform plastically. • Sudden stress, such as a hit with a hamm ...
NWGS BC Coast Range
... revised and updated version of the one used for the conference. It does not claim to give an even-handed overview of all aspects of the geology, but emphasizes structure and tectonics; granitic rocks are not the focus of the guidebook even though they constitute 80% of the Coast Mountains! The guide ...
... revised and updated version of the one used for the conference. It does not claim to give an even-handed overview of all aspects of the geology, but emphasizes structure and tectonics; granitic rocks are not the focus of the guidebook even though they constitute 80% of the Coast Mountains! The guide ...
06_chapter 2
... Island volcano goes back to at least 72 ka, that its caldera may have formed earlier to 10 ka. Based on ...
... Island volcano goes back to at least 72 ka, that its caldera may have formed earlier to 10 ka. Based on ...
Philippine Sea Plate inception, evolution, and consumption with
... across the paleo-transform boundary between the proto-PSP and the Pacific Plate, Izu-Bonin-Mariana subduction initiation and ultimately PSP inception. (2) The initial splitting phase of the composite proto-PSP under the plume influence at ∼54–48 Ma led to the formation of the long-lived West Philipp ...
... across the paleo-transform boundary between the proto-PSP and the Pacific Plate, Izu-Bonin-Mariana subduction initiation and ultimately PSP inception. (2) The initial splitting phase of the composite proto-PSP under the plume influence at ∼54–48 Ma led to the formation of the long-lived West Philipp ...
Article - The Oceanography Society
... Seamounts are the least explored major morphological features on Earth. Hundreds of thousands of them are dispersed through the ocean basins, with less than 0.1% known from any direct observation such as an echosounding, or any kind of sampling. Most of what we know about seamounts comes from satell ...
... Seamounts are the least explored major morphological features on Earth. Hundreds of thousands of them are dispersed through the ocean basins, with less than 0.1% known from any direct observation such as an echosounding, or any kind of sampling. Most of what we know about seamounts comes from satell ...
- BIROn - Birkbeck Institutional Research Online
... Pannonian Basin, the Dinarides (Serbia, Slovenia, Croatia, N. Bosnia), Bulgaria and western Turkey. Further south,within the Mediterranean region, anorogenic volcanism occurs in Sicily, Sardinia, Monte Vulture and the Veneto area of Italy, in the Alboran Sea and along the northern coast of Africa, l ...
... Pannonian Basin, the Dinarides (Serbia, Slovenia, Croatia, N. Bosnia), Bulgaria and western Turkey. Further south,within the Mediterranean region, anorogenic volcanism occurs in Sicily, Sardinia, Monte Vulture and the Veneto area of Italy, in the Alboran Sea and along the northern coast of Africa, l ...
Geologic Map of the Melba Quadrangle,Canyon and Ada Counties
... have described as strongly tholeiitic and included in their M2 catagory. Basalts of this catagory either require multiple magma sources or a single lithospheric source with a complex enrichment and depletion history for some elements. These basalts units were erupted from two small shield volcanoes, ...
... have described as strongly tholeiitic and included in their M2 catagory. Basalts of this catagory either require multiple magma sources or a single lithospheric source with a complex enrichment and depletion history for some elements. These basalts units were erupted from two small shield volcanoes, ...
online guide - Hofstra People
... A land of “Fire and Ice”, at least for the past few million years! Yet the geological history of NW Wyoming stretches back to the Archean Eon, roughly 2.7 billion years ago. This year’s field trip will visit the most thermally active area on the Earth’s surface – above the Yellowstone hot spot. Here ...
... A land of “Fire and Ice”, at least for the past few million years! Yet the geological history of NW Wyoming stretches back to the Archean Eon, roughly 2.7 billion years ago. This year’s field trip will visit the most thermally active area on the Earth’s surface – above the Yellowstone hot spot. Here ...
7. Skagit River
... At the same time, the varied rocks which comprise this spectacular province tell a much older story, a story which stretches back hundreds of millions of years into geologic time. This is the story of the geologic evolution of the Pacific Northwest, one of the most persistant enigmas in North America ...
... At the same time, the varied rocks which comprise this spectacular province tell a much older story, a story which stretches back hundreds of millions of years into geologic time. This is the story of the geologic evolution of the Pacific Northwest, one of the most persistant enigmas in North America ...
Paleogeographic and tectonic implications of Jurassic sedimentary
... of Walker’s (1988) overlap assemblage in the Victorville region (Fig. 2) and was interpreted to be Early Triassic in age. Coarse conglomeratic units within the Fairview Valley Formation were interpreted by Miller (1978b, 1981) as alluvial-fan facies reflecting intra-orogenic deposition following a P ...
... of Walker’s (1988) overlap assemblage in the Victorville region (Fig. 2) and was interpreted to be Early Triassic in age. Coarse conglomeratic units within the Fairview Valley Formation were interpreted by Miller (1978b, 1981) as alluvial-fan facies reflecting intra-orogenic deposition following a P ...
NWGS Pasco Basin
... The immense size of Columbia River flood-basalt lavas makes it difficult to determine what constitutes a single eruption and what does not. Historically, Columbia River flood-basalt descriptions have used the term cooling unit to describe a lobe. A single cooling unit is defined as having a flow top and ...
... The immense size of Columbia River flood-basalt lavas makes it difficult to determine what constitutes a single eruption and what does not. Historically, Columbia River flood-basalt descriptions have used the term cooling unit to describe a lobe. A single cooling unit is defined as having a flow top and ...
Fluid release from the subducted Cocos plate and
... transfer functions. The MT models demonstrate that the plate southern profile shows enhanced conductivity in the deep crust. The northern profile is dominated by an elongated conductive zone extending >250 km below the Trans-Mexican Volcanic Belt (TMVB). The isolated conductivity anomalies in the so ...
... transfer functions. The MT models demonstrate that the plate southern profile shows enhanced conductivity in the deep crust. The northern profile is dominated by an elongated conductive zone extending >250 km below the Trans-Mexican Volcanic Belt (TMVB). The isolated conductivity anomalies in the so ...
Fluid release from the subducted Cocos plate and partial melting of
... transfer functions. The MT models demonstrate that the plate southern profile shows enhanced conductivity in the deep crust. The northern profile is dominated by an elongated conductive zone extending >250 km below the Trans-Mexican Volcanic Belt (TMVB). The isolated conductivity anomalies in the so ...
... transfer functions. The MT models demonstrate that the plate southern profile shows enhanced conductivity in the deep crust. The northern profile is dominated by an elongated conductive zone extending >250 km below the Trans-Mexican Volcanic Belt (TMVB). The isolated conductivity anomalies in the so ...
Stratigraphy, geochemistry and tectonic significance of the
... In western Oaxaca, Tertiary magmatic activity is represented by extensive plutons along the continental margin and volcanic sequences in the inland region. K–Ar age determinations reported previously and in the present work indicate that these rocks correspond to a relatively broad arc in this regio ...
... In western Oaxaca, Tertiary magmatic activity is represented by extensive plutons along the continental margin and volcanic sequences in the inland region. K–Ar age determinations reported previously and in the present work indicate that these rocks correspond to a relatively broad arc in this regio ...
chapter 3
... The Coast Range Episode, the second episode in the assembly of the Pacific Northwest, was initiated with the accretion of the Insular Belt megaterrane in mid-Cretaceous time. The accretion of that terrane belt moved the western edge of the continent another several hundred kilometers to the west, est ...
... The Coast Range Episode, the second episode in the assembly of the Pacific Northwest, was initiated with the accretion of the Insular Belt megaterrane in mid-Cretaceous time. The accretion of that terrane belt moved the western edge of the continent another several hundred kilometers to the west, est ...
Geologic history of Siletzia, a large igneous province in the Oregon
... and outboard terranes were transported northward by plate motion and accreted to southern Alaska. The Yakutat terrane of southern Alaska has basalt basement compositions, stratigraphy, and a structural history similar to Siletzia (Plafker, 1987; Davis and Plafker, 1986), and may be related (Fig. 1). ...
... and outboard terranes were transported northward by plate motion and accreted to southern Alaska. The Yakutat terrane of southern Alaska has basalt basement compositions, stratigraphy, and a structural history similar to Siletzia (Plafker, 1987; Davis and Plafker, 1986), and may be related (Fig. 1). ...
Geology of the Pacific Northwest
The geology of the Pacific Northwest refers to the study of the composition (including rock, minerals, and soils), structure, physical properties and the processes that shape the Pacific Northwest region of the United States and Canada. The geology of the region produces much of the area's scenic beauty and also causes periodic catastrophes, such as volcanoes and earthquakes.There are at least five geologic provinces in the area: the Cascade Volcanoes, the Columbia Plateau, the North Cascades, the Coast Mountains, and the Insular Mountains. The Cascade Volcanoes are an active volcanic region along the western side of the Pacific Northwest. The Columbia Plateau is a region of subdued geography that is inland of the Cascade Volcanoes, and the North Cascades are a mountainous region in the northwest corner of the United States, extending into British Columbia. The Coast Mountains and Insular Mountains are a strip of mountains along the coast of British Columbia, each with its own geological history.The geology of the Pacific Northwest is vast, complex and confusing. Most of the region was formed about 200 million years ago as the North American Plate started to drift westward during the rupture of Pangaea. Since that date, the western edge of North America has grown westward as a succession of island arcs and assorted ocean-floor rocks have been added along the continental margin.