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... ground gravity and magnetic follow up indicate that the Albertine Graben is divided into a number of sub-basins with depocentres in L. Edward, Semliki, Lake Albert, Pakwach and Rhino Camp areas which exceed 6000m in places; ...
... ground gravity and magnetic follow up indicate that the Albertine Graben is divided into a number of sub-basins with depocentres in L. Edward, Semliki, Lake Albert, Pakwach and Rhino Camp areas which exceed 6000m in places; ...
Equatorial Segment of the Mid-Atlantic Ridge: initial results of the
... a cluster of fracture zones - Cape Verde, Marathon, Mercury, Vema, Doldrums, Vemadsky and Sierra Leone - in the North, and a similar cluser of fracture zones - St. Paul, Romanche and Chain - in the South. During recent decades, following the publication of the 5th edition of the General Bathymetric ...
... a cluster of fracture zones - Cape Verde, Marathon, Mercury, Vema, Doldrums, Vemadsky and Sierra Leone - in the North, and a similar cluser of fracture zones - St. Paul, Romanche and Chain - in the South. During recent decades, following the publication of the 5th edition of the General Bathymetric ...
Coolbaugh, M.F., Arehart, G.B., Faulds, J.E., and Garside, L.J., 2005
... Western North America is richly endowed with Cenozoic metallic ore deposits, including world-class porphyry copper/ molybdenum districts and Carlin-type sedimentary rock-hosted, disseminated gold deposits. Of major importance, western North America is also richly endowed in active geothermal systems ...
... Western North America is richly endowed with Cenozoic metallic ore deposits, including world-class porphyry copper/ molybdenum districts and Carlin-type sedimentary rock-hosted, disseminated gold deposits. Of major importance, western North America is also richly endowed in active geothermal systems ...
Author`s personal copy
... Voluminous intermediate to silicic composition volcanic rocks were generated throughout the southern Rocky Mountains, western U.S., during the mid-Tertiary “ignimbrite flare-up”, principally at the San Juan and Mogollon-Datil volcanic fields. At both volcanic centers, radiogenic isotope data have be ...
... Voluminous intermediate to silicic composition volcanic rocks were generated throughout the southern Rocky Mountains, western U.S., during the mid-Tertiary “ignimbrite flare-up”, principally at the San Juan and Mogollon-Datil volcanic fields. At both volcanic centers, radiogenic isotope data have be ...
Southern Urals CONTENTS Age and tectonic/structural setting
... onto the eastern margin of the Eastern European Plate. The arc-continent collision in the SE Urals resulted in the attachment of a shallow crustal accretionary complex comprising the MUFZ and marginal areas of East European Plate. Allochthonous slices rooted in the MUFZ were intercalated to accretio ...
... onto the eastern margin of the Eastern European Plate. The arc-continent collision in the SE Urals resulted in the attachment of a shallow crustal accretionary complex comprising the MUFZ and marginal areas of East European Plate. Allochthonous slices rooted in the MUFZ were intercalated to accretio ...
Crustal Magnetism, Lamellar Magnetism and Rocks That Remember
... Q values. In quickly cooled continental or oceanic lavas, fine-grained (titano-)magnetite is known to carry a sufficiently strong remanence to produce moderate to high Q values. Much of the continental crust contains coarser magnetite that produces induced anomalies. Yet, some coarsely crystalline r ...
... Q values. In quickly cooled continental or oceanic lavas, fine-grained (titano-)magnetite is known to carry a sufficiently strong remanence to produce moderate to high Q values. Much of the continental crust contains coarser magnetite that produces induced anomalies. Yet, some coarsely crystalline r ...
Initiation of subduction in nature and models
... The issue of induced versus spontaneous subduction initiation also remains partially controversial in both nature and within numerical models. As summarized by [5], nearly half of all active subduction zones initiated during the Cenozoic. Furthermore, all subduction zones associated with active back ...
... The issue of induced versus spontaneous subduction initiation also remains partially controversial in both nature and within numerical models. As summarized by [5], nearly half of all active subduction zones initiated during the Cenozoic. Furthermore, all subduction zones associated with active back ...
Crustal structure - Department of Geosciences
... This paper presents a geodynamical model that explains both the mechanics and the geology of the subduction, metamorphism, exhumation, and emplacement of UHP terranes into the upper level of the crust. Our focus is on UHP metamorphism and exhumation that occurs within ca. 10 Ma of the transition fro ...
... This paper presents a geodynamical model that explains both the mechanics and the geology of the subduction, metamorphism, exhumation, and emplacement of UHP terranes into the upper level of the crust. Our focus is on UHP metamorphism and exhumation that occurs within ca. 10 Ma of the transition fro ...
global tectonic cycles Temporal relations between mineral deposits
... The regional framework of mineral deposits and mineral provinces provides fundamental information essential for successful long-term exploration and discovery. Critical data that can be gleaned from regional studies include stratigraphic, structural and tectonic controls and geophysical, geochemical ...
... The regional framework of mineral deposits and mineral provinces provides fundamental information essential for successful long-term exploration and discovery. Critical data that can be gleaned from regional studies include stratigraphic, structural and tectonic controls and geophysical, geochemical ...
Mn – Manganese
... central as well as north-easternmost Greece and Crete, all in the Alpidic region of Europe. High Mn values in stream water (above 92 µg l-1) occur around the Baltic Sea, on the Precambrian Shield rocks in southern Sweden (located in a Pb mining area), in central, east and south Finland, and on shiel ...
... central as well as north-easternmost Greece and Crete, all in the Alpidic region of Europe. High Mn values in stream water (above 92 µg l-1) occur around the Baltic Sea, on the Precambrian Shield rocks in southern Sweden (located in a Pb mining area), in central, east and south Finland, and on shiel ...
Tertiary Igneous Rocks of Northeastern Cache Valley, Idaho
... to determine the types of igneous structures involved. ...
... to determine the types of igneous structures involved. ...
L.S. Normore - Department of Natural Resources
... group was first defined by Hayes (1948) with the type section occurring on a point of land separating Clode Sound and Goose Bay, north of the map area. The Connecting Point Group crops out throughout the central part of the map area as an 8- to 15-km-wide north– south-trending, moderately east-dippi ...
... group was first defined by Hayes (1948) with the type section occurring on a point of land separating Clode Sound and Goose Bay, north of the map area. The Connecting Point Group crops out throughout the central part of the map area as an 8- to 15-km-wide north– south-trending, moderately east-dippi ...
Seismic crustal structure between the Transylvanian
... E) are intersected, which are largely covered by the nappes of the Carpathian Orogen or the Neogene sedimentary basins. Whereas these plates were consolidated during complex pre-Mesozoic deformations, the Carpathian Orogen and the younger sedimentary basins are the result of plate convergence during ...
... E) are intersected, which are largely covered by the nappes of the Carpathian Orogen or the Neogene sedimentary basins. Whereas these plates were consolidated during complex pre-Mesozoic deformations, the Carpathian Orogen and the younger sedimentary basins are the result of plate convergence during ...
Imaging subduction from the trench to 300 km depth beneath the
... ca. 2 Myr ago, joined by voluminous rhyolitic (plus minor basaltic and dacitic) activity from ca. 1.6 Myr ago. Volcanic activity within the TVZ changes character along strike, with rhyolite dominant caldera volcanoes in the central section and andesite dominant cone volcanoes to the north and south ...
... ca. 2 Myr ago, joined by voluminous rhyolitic (plus minor basaltic and dacitic) activity from ca. 1.6 Myr ago. Volcanic activity within the TVZ changes character along strike, with rhyolite dominant caldera volcanoes in the central section and andesite dominant cone volcanoes to the north and south ...
A-Level Handbook V4 - Earth Science Teachers` Association
... There are two examination boards that produce specifications for Geology AS and A2 level; namely OCR and WJEC. Both specifications contain the QCA Core Content, so there is overlap in some places. However, the interpretation of these core statements is different in the two different exam boards, all ...
... There are two examination boards that produce specifications for Geology AS and A2 level; namely OCR and WJEC. Both specifications contain the QCA Core Content, so there is overlap in some places. However, the interpretation of these core statements is different in the two different exam boards, all ...
Lithospheric evolution of the Andean fold–thrust belt, Bolivia, and
... by hot asthenosphere may have provided the heat source for a pulse of mafic volcanism in the Eastern Cordillera and Altiplano at 24–23 Ma, and further volcanism recorded by 12–7 Ma crustal ignimbrites. 4) After ~20 Ma, deformation waned in the Eastern Cordillera and Interandean zone and began to be ...
... by hot asthenosphere may have provided the heat source for a pulse of mafic volcanism in the Eastern Cordillera and Altiplano at 24–23 Ma, and further volcanism recorded by 12–7 Ma crustal ignimbrites. 4) After ~20 Ma, deformation waned in the Eastern Cordillera and Interandean zone and began to be ...
Fluorite Ridge Mines
... Florida and Little Florida Mountains. In the broad Mimbres Valley between the two fluorspar areas is Deming, to which most of the fluorspar mined in the county is taken. There it is beneficiated in the General Chemical Company's flotation mill or the Grattan flotation mill, or is shipped direct to c ...
... Florida and Little Florida Mountains. In the broad Mimbres Valley between the two fluorspar areas is Deming, to which most of the fluorspar mined in the county is taken. There it is beneficiated in the General Chemical Company's flotation mill or the Grattan flotation mill, or is shipped direct to c ...
54. Regional Geology of the Goban Spur Continental Margin
... occurred simultaneously with the deposition of formation 3. The upper two sequences are draped over the basement topography and postdate any large-scale fault movement. The early history of the margin, the rift phase, was characterized by the formation of an "en-échelon" series of margin-parallel no ...
... occurred simultaneously with the deposition of formation 3. The upper two sequences are draped over the basement topography and postdate any large-scale fault movement. The early history of the margin, the rift phase, was characterized by the formation of an "en-échelon" series of margin-parallel no ...
2.1.1 Introduction
... fault imparts only shearing motions in their directions; they are consequently known as nodal planes. Simplistically, then, a focal mechanism solution could be obtained by recording an earthquake at a number of seismographs distributed around its epicenter, determining the nature of the first motion ...
... fault imparts only shearing motions in their directions; they are consequently known as nodal planes. Simplistically, then, a focal mechanism solution could be obtained by recording an earthquake at a number of seismographs distributed around its epicenter, determining the nature of the first motion ...
Neoproterozoic Conglomerate and Breccia in the Formation of
... Upper Formation of Leaton Gulch (OZlu) The upper part of the formation of Leaton Gulch (OZlu) unconformably overlies OZll on a channelized contact (Fig. 9), and consists of an upward-fining conglomerate to siltstone succession (see stratigraphic column, Fig. 4). The unit lacks outcrop scale folds, a ...
... Upper Formation of Leaton Gulch (OZlu) The upper part of the formation of Leaton Gulch (OZlu) unconformably overlies OZll on a channelized contact (Fig. 9), and consists of an upward-fining conglomerate to siltstone succession (see stratigraphic column, Fig. 4). The unit lacks outcrop scale folds, a ...
Temporal relations between mineral deposits and global tectonic
... The regional framework of mineral deposits and mineral provinces provides fundamental information essential for successful long-term exploration and discovery. Critical data that can be gleaned from regional studies include stratigraphic, structural and tectonic controls and geophysical, geochemical ...
... The regional framework of mineral deposits and mineral provinces provides fundamental information essential for successful long-term exploration and discovery. Critical data that can be gleaned from regional studies include stratigraphic, structural and tectonic controls and geophysical, geochemical ...
The origin of metamorphic core complexes and detachment faults
... southeastern California and western Arizona, where multiple generations of detachment faults have produced remarkable excisement and incisement geometries. ...
... southeastern California and western Arizona, where multiple generations of detachment faults have produced remarkable excisement and incisement geometries. ...
Landform evolution in the Nagar region, Hispar Mustagh Karakoram
... Results of geomorphological analysis of climate-morphogenetic landform patterns in the Nagar region of the Hispar Mustagh Karakoram, related to morphotectonic features of relief-building processes in the Late Cainozoic, are presented. High-mountain landforms are the result of morphotectonic processe ...
... Results of geomorphological analysis of climate-morphogenetic landform patterns in the Nagar region of the Hispar Mustagh Karakoram, related to morphotectonic features of relief-building processes in the Late Cainozoic, are presented. High-mountain landforms are the result of morphotectonic processe ...
Some Thermal Constraints on Crustal
... in the ‘mantle wedge’ above subduction zones (e.g. Hildreth & Moorbath, 1988; Davies & Stevenson, 1992). However, mantle-derived magmas can also undergo closed-system fractional crystallization (FC) in crustal magma chambers, and to complicate matters the ‘granitic’ magmatic end products of FC proce ...
... in the ‘mantle wedge’ above subduction zones (e.g. Hildreth & Moorbath, 1988; Davies & Stevenson, 1992). However, mantle-derived magmas can also undergo closed-system fractional crystallization (FC) in crustal magma chambers, and to complicate matters the ‘granitic’ magmatic end products of FC proce ...
Different Coloration of Devonian Shales
... As the mountain building forms the basin begins to fill in with sediment and form land. As the mountain building process begins the earth acts as a trampoline, and the earth sinks a little as the ...
... As the mountain building forms the basin begins to fill in with sediment and form land. As the mountain building process begins the earth acts as a trampoline, and the earth sinks a little as the ...
Algoman orogeny
![](https://commons.wikimedia.org/wiki/Special:FilePath/Orogenic_wedge.jpg?width=300)
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.