geologic map of the pocatello south quadrangle, bannock and
... olive-green or maroon slate with discontinuous lenses of marble at top of member. Marble is thin-bedded to massive, tan to dark gray, typically composed of calcite but locally dolomite, and as much as 30 feet thick. Quartzite is interbedded with interlaminated metasiltstone and fine-grained quartzit ...
... olive-green or maroon slate with discontinuous lenses of marble at top of member. Marble is thin-bedded to massive, tan to dark gray, typically composed of calcite but locally dolomite, and as much as 30 feet thick. Quartzite is interbedded with interlaminated metasiltstone and fine-grained quartzit ...
California terranes
... (Şengör and Dewey, 1990, and references therein; Hansen and Dusel-Bacon, 1998; Moores and Day, 1984). 3. Many tectonic models for the western United States have considered only east-dipping subduction zones, and the role of terranes in structural development of an orogen has seldom been considered ...
... (Şengör and Dewey, 1990, and references therein; Hansen and Dusel-Bacon, 1998; Moores and Day, 1984). 3. Many tectonic models for the western United States have considered only east-dipping subduction zones, and the role of terranes in structural development of an orogen has seldom been considered ...
gravity and magnetic integrated data interpretation of the
... magnetization) over the intrusion outcrop. A2Ma also shows a high amplitude Bouguer anomaly of –4 mGal (+22 mGal of residual anomaly) and magnetic anomaly stronger than ME, varying from –4000 nT to +3000 nT. But at the anomaly site the authors could not find any outcrop, just sediments from the Arag ...
... magnetization) over the intrusion outcrop. A2Ma also shows a high amplitude Bouguer anomaly of –4 mGal (+22 mGal of residual anomaly) and magnetic anomaly stronger than ME, varying from –4000 nT to +3000 nT. But at the anomaly site the authors could not find any outcrop, just sediments from the Arag ...
DNR Yakima Fold Belt Reidel and Campbell
... maps of Figs. 12, 13, and 14. B. Units older than the Columbia River Basalt Group that are exposed along the margin of the Columbia River basalt Holocene surficial sediments are generalized as: alluvium ...
... maps of Figs. 12, 13, and 14. B. Units older than the Columbia River Basalt Group that are exposed along the margin of the Columbia River basalt Holocene surficial sediments are generalized as: alluvium ...
Rusty Ridge JEA Drilling Report (PDF Format)
... a sequence of mafic volcanic rocks and mafic volcano-sedimentary sequences. The contact with the base of the felsic volcanics and the top of the mafic volcanic rocks is somewhat enigmatic. The nature of the contact suggests a possible unconformity resulting from a hiatus in volcanic activity, due to ...
... a sequence of mafic volcanic rocks and mafic volcano-sedimentary sequences. The contact with the base of the felsic volcanics and the top of the mafic volcanic rocks is somewhat enigmatic. The nature of the contact suggests a possible unconformity resulting from a hiatus in volcanic activity, due to ...
Faults and Earthquakes - Indiana Geological Survey
... Hanging Wall – a block of crust that lies beneath the fault plane Hypocenter – the point within the Earth’s crust where an earthquake begins; also commonly termed the focus Earthquake – the shaking or vibration of the ground surface in response to the sudden release of energy caused by fault movemen ...
... Hanging Wall – a block of crust that lies beneath the fault plane Hypocenter – the point within the Earth’s crust where an earthquake begins; also commonly termed the focus Earthquake – the shaking or vibration of the ground surface in response to the sudden release of energy caused by fault movemen ...
Bedrock Geology along the Northern Margin of the Athabasca Basin
... quartzite, they were correlative with the Murmac Bay Group, a shelf-type siliciclastic succession best known in the Uranium City area (Hartlaub, 2004; Hartlaub et al., 2004). Both Paleoproterozoic (O’Hanley et al., 1994) and Archean (Hartlaub et al., 2004) ages have been suggested for the Murmac Bay ...
... quartzite, they were correlative with the Murmac Bay Group, a shelf-type siliciclastic succession best known in the Uranium City area (Hartlaub, 2004; Hartlaub et al., 2004). Both Paleoproterozoic (O’Hanley et al., 1994) and Archean (Hartlaub et al., 2004) ages have been suggested for the Murmac Bay ...
Faults - Dr.A.Shah
... Symmetrical Folds: A ‘symmetrical folds’ is one where the axial plane is vertical and the two limbs have the same amount of dip. Asymmetrical folds: An asymmetrical folds is one where the axial plane is inclined and the limbs dip at different angles, and in opposite directions. Overturned folds: Ove ...
... Symmetrical Folds: A ‘symmetrical folds’ is one where the axial plane is vertical and the two limbs have the same amount of dip. Asymmetrical folds: An asymmetrical folds is one where the axial plane is inclined and the limbs dip at different angles, and in opposite directions. Overturned folds: Ove ...
Crustal Shortening and Extension in the Central Andes: Insights
... (FTB) [Isacks, 1988; Sheffels, 1990], consistent with modern seismicity [Suarez et al., 1983]. Leffler et al. [1997] and Norabuena et al. [1998] suggested that the GPS velocity in the coastal area and the Altiplano represents elastic strain that will be released in future earthquakes, and only withi ...
... (FTB) [Isacks, 1988; Sheffels, 1990], consistent with modern seismicity [Suarez et al., 1983]. Leffler et al. [1997] and Norabuena et al. [1998] suggested that the GPS velocity in the coastal area and the Altiplano represents elastic strain that will be released in future earthquakes, and only withi ...
Early Ordovician rifting of Avalonia and birth of the Rheic Ocean: U
... volcanic tuff sampled immediately below the sub-Conception Group unconformity yields a date of 729 7 Ma (Israel 1998), thereby negating any correlation with the younger volcanic arc sequences. On the Connaigre Peninsula, early arc rocks are represented by low-grade calc-alkaline rhyolite flows and ...
... volcanic tuff sampled immediately below the sub-Conception Group unconformity yields a date of 729 7 Ma (Israel 1998), thereby negating any correlation with the younger volcanic arc sequences. On the Connaigre Peninsula, early arc rocks are represented by low-grade calc-alkaline rhyolite flows and ...
Introduction and project objectives
... The sheer size of the study area limits the amount of detail with which the total area could be mapped. Due to the long geological history and relatively small amount of outcrops, it is difficult to accurately recreate an exact geochronological timeline of the numerous events that took place by ...
... The sheer size of the study area limits the amount of detail with which the total area could be mapped. Due to the long geological history and relatively small amount of outcrops, it is difficult to accurately recreate an exact geochronological timeline of the numerous events that took place by ...
Forum Reply - Francis A. Macdonald
... England Appalachians and reassess the tectonic evolution of the Taconic orogeny. Detrital zircon ages demonstrate that the Moretown Formation (Fm) was deposited on a peri-Gondwanan terrane, referred to as the Moretown terrane, and metamorphic and igneous ages suggest that it accreted to extended fra ...
... England Appalachians and reassess the tectonic evolution of the Taconic orogeny. Detrital zircon ages demonstrate that the Moretown Formation (Fm) was deposited on a peri-Gondwanan terrane, referred to as the Moretown terrane, and metamorphic and igneous ages suggest that it accreted to extended fra ...
geologic map (scale 1 :250000) of the penokean orogen, central
... orogen is known to extend along the southern margin of the Archean Superior craton from central Minnesota to the Grenville Front, and appears to have been the locus of tectonic activity from before 2200 Ma to about 1760 Ma (Young, 1983). It is possible that the orogen does not end on the west in cen ...
... orogen is known to extend along the southern margin of the Archean Superior craton from central Minnesota to the Grenville Front, and appears to have been the locus of tectonic activity from before 2200 Ma to about 1760 Ma (Young, 1983). It is possible that the orogen does not end on the west in cen ...
millenderdale
... that the site of intrusion was tectonically active. The textural evidence indicates that much of the hornblende in the ‘beerbachites' has replaced granoblastic pyroxene developed in original doleritic and gabbroic lithologies. This requires a post-magmatic metamorphism at about 900 to 1000°C (Jeline ...
... that the site of intrusion was tectonically active. The textural evidence indicates that much of the hornblende in the ‘beerbachites' has replaced granoblastic pyroxene developed in original doleritic and gabbroic lithologies. This requires a post-magmatic metamorphism at about 900 to 1000°C (Jeline ...
- NERC Open Research Archive
... largely derived from felsic, mafic and ultramafic intrusive igneous protoliths. The Torridonian rocks are mostly fluviatile to lacustrine, red-brown arkosic sandstones with local conglomerates and minor siltstones and mudstones. They are late Mesoproterozoic and early Neoproterozoic in age and have ...
... largely derived from felsic, mafic and ultramafic intrusive igneous protoliths. The Torridonian rocks are mostly fluviatile to lacustrine, red-brown arkosic sandstones with local conglomerates and minor siltstones and mudstones. They are late Mesoproterozoic and early Neoproterozoic in age and have ...
Geological Society, London, Special Publications
... (Maltman et al. 1997). The cataclasite units are interpreted as fault strands that accommodated higher strain than the surrounding mélange due to the total destruction of the original bedding and transposition or destruction of previous mélange fabrics. Ultrafine-grained black fault rocks (BFRs) l ...
... (Maltman et al. 1997). The cataclasite units are interpreted as fault strands that accommodated higher strain than the surrounding mélange due to the total destruction of the original bedding and transposition or destruction of previous mélange fabrics. Ultrafine-grained black fault rocks (BFRs) l ...
CENOZOIC HISTORY OF THE CHUYA DEPRESSION (Gorny Altai
... structure of the formation suggest its origin in a large limnic basin, and the presence of coarse-grained interbeds with angular fragments at the depression's periphery indicates the inception of the Kurai Range. The 50 m thick Kyzyl-Gir Formation is composed of yellow-brown and gray coarse-grained ...
... structure of the formation suggest its origin in a large limnic basin, and the presence of coarse-grained interbeds with angular fragments at the depression's periphery indicates the inception of the Kurai Range. The 50 m thick Kyzyl-Gir Formation is composed of yellow-brown and gray coarse-grained ...
U-Pb MINERAL AGE DETERMINATIONS FROM ARCHEAN ROCKS
... Sokli, and the Lapland Volcanite Project by the Geological Survey carried out detailed studies of the volcanic rocks. Isotopic studies were, however, almost non-existent as the only sample taken for U-Pb determinations was from a mafic dike (A1001) crosscutting the Archean rocks in the southern part ...
... Sokli, and the Lapland Volcanite Project by the Geological Survey carried out detailed studies of the volcanic rocks. Isotopic studies were, however, almost non-existent as the only sample taken for U-Pb determinations was from a mafic dike (A1001) crosscutting the Archean rocks in the southern part ...
The Russian Far East is a territory where young geological
... Institute scientists work in close collaboration with local universities and colleges including the Far Eastern State University, the Far Eastern State Technical University, and the Vladivostok State University of Economy and Service. In addition, FEGI scientists periodically present lectures in col ...
... Institute scientists work in close collaboration with local universities and colleges including the Far Eastern State University, the Far Eastern State Technical University, and the Vladivostok State University of Economy and Service. In addition, FEGI scientists periodically present lectures in col ...
A preliminary Geological and Generalized Stratigraphy of Western
... sensors are highly advanced, multi-channel scanning devices designed to acquire high resolution image, improved geometric fidelity, sharper spectral separation, and greater radiometric resolution than the older Multi Spectral Scanner (MSS) sensors (Muzein, 2006). The ETM+ sensors with their six comp ...
... sensors are highly advanced, multi-channel scanning devices designed to acquire high resolution image, improved geometric fidelity, sharper spectral separation, and greater radiometric resolution than the older Multi Spectral Scanner (MSS) sensors (Muzein, 2006). The ETM+ sensors with their six comp ...
Mountain Building Processes in Four-Dimensions (4D-MB)
... mission. It will test the hypothesis that re-organizations of Earth’s mantle during the collision of tectonic plates have both immediate and long-lasting effects on earthquake distribution, crustal motion and landscape evolution in mountain belts. 4D-MB challenges conventional wisdom by recognising ...
... mission. It will test the hypothesis that re-organizations of Earth’s mantle during the collision of tectonic plates have both immediate and long-lasting effects on earthquake distribution, crustal motion and landscape evolution in mountain belts. 4D-MB challenges conventional wisdom by recognising ...
Neoproterozoic Conglomerate and Breccia in the Formation of
... is interpreted to be part of the record of the Neoproterozoic Beaverhead Impact Event. On Grouse Peak at the north end of the Lost River Range (Pahsimeroi Mountains), the formation of Leaton Gulch (Neoproterozoic to Ordovician) contains two stratigraphic units. The thick lower part (OZll) is hundred ...
... is interpreted to be part of the record of the Neoproterozoic Beaverhead Impact Event. On Grouse Peak at the north end of the Lost River Range (Pahsimeroi Mountains), the formation of Leaton Gulch (Neoproterozoic to Ordovician) contains two stratigraphic units. The thick lower part (OZll) is hundred ...
isotope geology and fennoscandian lithosphere evolution
... Finland ever since its inception in the early sixties. The main analytical methods used have been U-Pb, Sm-Nd, Rb-Sr, Pb-Pb and light stable isotopes, and with the recent LA-MC-ICPMS instrument installation, the repertoire is increasing. Isotope research has contributed to many joint projects over a ...
... Finland ever since its inception in the early sixties. The main analytical methods used have been U-Pb, Sm-Nd, Rb-Sr, Pb-Pb and light stable isotopes, and with the recent LA-MC-ICPMS instrument installation, the repertoire is increasing. Isotope research has contributed to many joint projects over a ...
What happened 1.5 billion years ago?
... and Lake Michikamau—are being done by R. F. Emslie of the Geological Survey of Canada. The work at Nain draws heavily on Wheeler's work, and drew as well on Wheeler himself, who took part in the project during the first three summers. ...
... and Lake Michikamau—are being done by R. F. Emslie of the Geological Survey of Canada. The work at Nain draws heavily on Wheeler's work, and drew as well on Wheeler himself, who took part in the project during the first three summers. ...
pdf
... “off-axis” magmatism might be a common process in (ultra-) slow oceanic spreading systems, where “magmatic” and “tectonic” spreading varies in both space and time. Keywords: Ocean-Continent transition, MORB, rifting, magma-poor margins, age determinations. INTRODUCTION It is generally accepted that ...
... “off-axis” magmatism might be a common process in (ultra-) slow oceanic spreading systems, where “magmatic” and “tectonic” spreading varies in both space and time. Keywords: Ocean-Continent transition, MORB, rifting, magma-poor margins, age determinations. INTRODUCTION It is generally accepted that ...
TaskForceMajella
The TaskForceMajella (TFM) is an industry funded geoscientific research project conducted between the years 1998 and 2005. The project involved numerous universities distributed worldwide, and was sponsored by a number of international major oil companies. The area of research was the Majella Mountain in Central Italy, regarded as an analogue of a faulted and fractured hydrocarbon reservoir as can be found in major provinces like the Middle East, Caspian Basin, Mediterranean Basin, and other areas. The scope was to obtain knowledge on the relation between fracture and fault generation, and all types of geological aspects of the evolution of the geological structure.