Popov_a
... the Priabonian and continued almost without breaks during the Oligocene and Neogene. The postcollisional orogenic belt was formed as a result of a general uplift. Intensive faulting, vertical block displacement and molasse type sedimentation in depressions are typical. The Trans-Balkan volcanic belt ...
... the Priabonian and continued almost without breaks during the Oligocene and Neogene. The postcollisional orogenic belt was formed as a result of a general uplift. Intensive faulting, vertical block displacement and molasse type sedimentation in depressions are typical. The Trans-Balkan volcanic belt ...
Summary of Northeast Asia geodynamics and tectonics*
... continental-margin rocks, oceanic crust and overlying units, and oceanic mantle. Units are interpreted to have formed during tectonic juxtaposition in a zone of major thrusting of one lithosphere plate beneath another, generally in zones of thrusting along the margin of a continent or an island arc. ...
... continental-margin rocks, oceanic crust and overlying units, and oceanic mantle. Units are interpreted to have formed during tectonic juxtaposition in a zone of major thrusting of one lithosphere plate beneath another, generally in zones of thrusting along the margin of a continent or an island arc. ...
Field Trip Guide to the Upper Cretaceous Hornbrook Formation and
... Wells (1956) published a geologic map of the Medford 15-minute quadrangle highlighting the sedimentary deposits. Smith and others (1982) produced a 1:250,000 scale geologic map of the 1o by 2o Medford quadrangle. In recent years, the focus has shifted from the compilation of regional geologic maps t ...
... Wells (1956) published a geologic map of the Medford 15-minute quadrangle highlighting the sedimentary deposits. Smith and others (1982) produced a 1:250,000 scale geologic map of the 1o by 2o Medford quadrangle. In recent years, the focus has shifted from the compilation of regional geologic maps t ...
Ancient North America (Laurentia)
... erupted atop the sediments 1700 million years ago, but their existence is known only from remnants that collapsed into pits formed by gaseous explosions from great depth (the Wernecke breccias; Thorkelson et al., 2005). About 1320 Ma, crustal extension was accompanied by basalt intrusions (dykes, si ...
... erupted atop the sediments 1700 million years ago, but their existence is known only from remnants that collapsed into pits formed by gaseous explosions from great depth (the Wernecke breccias; Thorkelson et al., 2005). About 1320 Ma, crustal extension was accompanied by basalt intrusions (dykes, si ...
The Cretaceous and Cenozoic tectonic evolution of
... of conclusive full fit reconstructions between two conjugate continental margins. This region, as the link between the Tethys and (proto-)Pacific, is complex also because of the uncertain nature of plate boundaries that accommodated generally westward subduction of (proto-)Pacific oceanic crust bene ...
... of conclusive full fit reconstructions between two conjugate continental margins. This region, as the link between the Tethys and (proto-)Pacific, is complex also because of the uncertain nature of plate boundaries that accommodated generally westward subduction of (proto-)Pacific oceanic crust bene ...
evolution of the north american cordillera
... continental separation south of the trans-Idaho discontinuity occurred during the interval 600–575 Ma (Armin & Mayer 1983). Isotopic dating of synrift volcanic rocks in southern British Columbia at 570 ± 5 Ma (Colpron et al. 2002) documents that active rifting persisted into latest Neoproterozoic ti ...
... continental separation south of the trans-Idaho discontinuity occurred during the interval 600–575 Ma (Armin & Mayer 1983). Isotopic dating of synrift volcanic rocks in southern British Columbia at 570 ± 5 Ma (Colpron et al. 2002) documents that active rifting persisted into latest Neoproterozoic ti ...
EVOLUTION OF THE NORTH AMERICAN CORDILLERA William R
... continental separation south of the trans-Idaho discontinuity occurred during the interval 600–575 Ma (Armin & Mayer 1983). Isotopic dating of synrift volcanic rocks in southern British Columbia at 570 ± 5 Ma (Colpron et al. 2002) documents that active rifting persisted into latest Neoproterozoic ti ...
... continental separation south of the trans-Idaho discontinuity occurred during the interval 600–575 Ma (Armin & Mayer 1983). Isotopic dating of synrift volcanic rocks in southern British Columbia at 570 ± 5 Ma (Colpron et al. 2002) documents that active rifting persisted into latest Neoproterozoic ti ...
Chortis block: where did it come from - Centro de Geociencias
... (1937), then well described in relation to its mineral deposits (Roberts and Irving, 1957), subsequently comprehensively treated by Butterlin (1977) and Weyl (1980), and most thoroughly reviewed on occasion of the Centennial Decade celebration of the Geological Society of America by Donnelly and ot ...
... (1937), then well described in relation to its mineral deposits (Roberts and Irving, 1957), subsequently comprehensively treated by Butterlin (1977) and Weyl (1980), and most thoroughly reviewed on occasion of the Centennial Decade celebration of the Geological Society of America by Donnelly and ot ...
Heavy Mineral Characteristics and Their Implication for Provenance
... rutile-ilmenite-leucoxene-pyroxene combination. The first two main factors contain the unstable mineral pyroxene and the unstable minerals apatite, monazite, ilmenite and leucoxene; the rest of the minerals are ultra-stable minerals. A portion of the interpreted information (13.80%) of F3 represents ...
... rutile-ilmenite-leucoxene-pyroxene combination. The first two main factors contain the unstable mineral pyroxene and the unstable minerals apatite, monazite, ilmenite and leucoxene; the rest of the minerals are ultra-stable minerals. A portion of the interpreted information (13.80%) of F3 represents ...
- NERC Open Research Archive
... for similar deep crustal structure across the different terranes; (3) ocean island basalt magmas and deep marine sedimentary rocks formed during continental margin extension within the previously proposed accretionary wedge sequence (i.e. not formed against an active oceanic arc); (4) the distributi ...
... for similar deep crustal structure across the different terranes; (3) ocean island basalt magmas and deep marine sedimentary rocks formed during continental margin extension within the previously proposed accretionary wedge sequence (i.e. not formed against an active oceanic arc); (4) the distributi ...
vi. north moluccas
... are also similarities with the Triassic stratigraphy of nearby Misool, but the Jurassic- Paleogene of SeramBuru is in more distal facies, and lack the rich macrofossil faunas of Misool. There is also evidence of consumed oceanic crust between Misool and Seram (see below), so the present-day proximit ...
... are also similarities with the Triassic stratigraphy of nearby Misool, but the Jurassic- Paleogene of SeramBuru is in more distal facies, and lack the rich macrofossil faunas of Misool. There is also evidence of consumed oceanic crust between Misool and Seram (see below), so the present-day proximit ...
Subduction cycles under western North America during the
... relative to surrounding plates and relative to the mantle below the asthenosphere. In western North America, magmatism and tectonics during the Jurassic period are quite similar to magmatism and tectonics since mid-Cretaceous time except strikeslip faulting shifted in sense from left lateral to righ ...
... relative to surrounding plates and relative to the mantle below the asthenosphere. In western North America, magmatism and tectonics during the Jurassic period are quite similar to magmatism and tectonics since mid-Cretaceous time except strikeslip faulting shifted in sense from left lateral to righ ...
NWGS BC Coast Range
... tectonic evolution. The trip was run initially as part of the Geological Society of America Penrose Conference on the “Tectonic evolution of the Coast Mountains orogen,” held from 17-22 May 1992 (reported in GSA Today, October 1992). This guidebook is a revised and updated version of the one used fo ...
... tectonic evolution. The trip was run initially as part of the Geological Society of America Penrose Conference on the “Tectonic evolution of the Coast Mountains orogen,” held from 17-22 May 1992 (reported in GSA Today, October 1992). This guidebook is a revised and updated version of the one used fo ...
A review of structure and tectonics of Kutch basin, western
... The Kutch basin is a western margin pericratonic rift basin of India. Nagar Parkar uplift in the north and Kathiawar uplift (Saurashtra horst) in the south respectively along Nagar Parkar and North Kathiawar faults delimit the E–W rift. The Kutch rift was initiated during the Late Triassic break up ...
... The Kutch basin is a western margin pericratonic rift basin of India. Nagar Parkar uplift in the north and Kathiawar uplift (Saurashtra horst) in the south respectively along Nagar Parkar and North Kathiawar faults delimit the E–W rift. The Kutch rift was initiated during the Late Triassic break up ...
The early interaction between the Caribbean Plateau and the NW
... 9809289), the Triassic migmatites exposed in the southern Eastern Cordillera (UTM: 758038/9669978) and basaltic lavas of the Natividad Unit (UTM: 771610/9996629). Analytical details and data tables are stored in the data repository. UTM coordinates are indicated in the Prov. S. Amer. 56 system. ...
... 9809289), the Triassic migmatites exposed in the southern Eastern Cordillera (UTM: 758038/9669978) and basaltic lavas of the Natividad Unit (UTM: 771610/9996629). Analytical details and data tables are stored in the data repository. UTM coordinates are indicated in the Prov. S. Amer. 56 system. ...
The role of crustal and mantle sources in the genesis of granitoids of
... Sri (0.714 to 0.720) and low Ndi (–7.4 to –8.1). A suite of metaluminous granites (EPL-II in Fig. 3b) was intruded at c. 210 Ma, and shows relatively low 87Sr/86Sri (c. 0.706) and high Ndi (−1.9 to –3.4). Subsequently, highly peraluminous leucogranites (EPL-III in Fig. 3b) were emplaced at c. 205 ...
... Sri (0.714 to 0.720) and low Ndi (–7.4 to –8.1). A suite of metaluminous granites (EPL-II in Fig. 3b) was intruded at c. 210 Ma, and shows relatively low 87Sr/86Sri (c. 0.706) and high Ndi (−1.9 to –3.4). Subsequently, highly peraluminous leucogranites (EPL-III in Fig. 3b) were emplaced at c. 205 ...
Paleogene Foredeep Basin Deposits of North
... FIG. 4. Schematic cross-sections of the Remedios (Cubitas Hills) and Placetas (Camaján Hills) sequences in Camagüey, exemplifying the complex structure of those areas. Adapted from Iturralde-Vinent et al. (1981). ...
... FIG. 4. Schematic cross-sections of the Remedios (Cubitas Hills) and Placetas (Camaján Hills) sequences in Camagüey, exemplifying the complex structure of those areas. Adapted from Iturralde-Vinent et al. (1981). ...
Evidence for Early Cretaceous oceanic crust trapped in the
... The Huatung Basin located east of Taiwan constitutes the westernmost part of the PSP. It is bordered by the Luzon volcanic arc to the west and by the Gagua Ridge to the east (Fig. 1). It extends from latitude 20³30PN to 23³30PN, and from longitude 121³30PE to 123³E, and covers an area of about 22 30 ...
... The Huatung Basin located east of Taiwan constitutes the westernmost part of the PSP. It is bordered by the Luzon volcanic arc to the west and by the Gagua Ridge to the east (Fig. 1). It extends from latitude 20³30PN to 23³30PN, and from longitude 121³30PE to 123³E, and covers an area of about 22 30 ...
Building stones of Greater Lincolnshire
... as coursed rubblestone in some of the local churches such as St Lawrence in Scunthorpe – often with Lincolnshire Limestone dressings and mouldings. The rock is an iron-rich oolitic limestone (oolites are spherical grains of calcium carbonate) which has a greenish colour when fresh but weathers to an ...
... as coursed rubblestone in some of the local churches such as St Lawrence in Scunthorpe – often with Lincolnshire Limestone dressings and mouldings. The rock is an iron-rich oolitic limestone (oolites are spherical grains of calcium carbonate) which has a greenish colour when fresh but weathers to an ...
The rocks on which we stand The geology of Greater Lincolnshire
... Slate is another imported rock which is widely used as a building material throughout the area. The distribution of this was initially by boat to the various ports in the area but the construction of the railways allowed for even wider distribution in the 19th century. For example, Victorian terrace ...
... Slate is another imported rock which is widely used as a building material throughout the area. The distribution of this was initially by boat to the various ports in the area but the construction of the railways allowed for even wider distribution in the 19th century. For example, Victorian terrace ...
Review of Upper Paleozoic and Lower Mesozoic stratigraphy and
... are made up of a mosaic of pre-Jurassic terranes, and that previously defined terranes are mostly composites of basements of different origins. Most of those terranes are allochthonous with respect to North America, but some developed not far from their present position. It has been suggested that t ...
... are made up of a mosaic of pre-Jurassic terranes, and that previously defined terranes are mostly composites of basements of different origins. Most of those terranes are allochthonous with respect to North America, but some developed not far from their present position. It has been suggested that t ...
Post-Hercynian formations of the western Tauern window
... The upper member of the Wustkogel formation consists of mature and pure quartzites which may be conglomeratic (quartzite pebbles) in places. It is up to several tens of metres thick. The entire formation is characterized by its light green colour due to phengite. D e p o s i t i o n a l e n v i r o ...
... The upper member of the Wustkogel formation consists of mature and pure quartzites which may be conglomeratic (quartzite pebbles) in places. It is up to several tens of metres thick. The entire formation is characterized by its light green colour due to phengite. D e p o s i t i o n a l e n v i r o ...
Regional Geology of the Bight Basin
... early 1970s, the early 1990s, and 2000-present (see O’Neil, 2003). In nearly 50 years of exploration in the offshore Bight Basin, approximately 100,000 line-km of seismic data have been acquired and only 10 petroleum exploration wells have been drilled (Figure 9). With the exception of Gnarlyknots 1 ...
... early 1970s, the early 1990s, and 2000-present (see O’Neil, 2003). In nearly 50 years of exploration in the offshore Bight Basin, approximately 100,000 line-km of seismic data have been acquired and only 10 petroleum exploration wells have been drilled (Figure 9). With the exception of Gnarlyknots 1 ...
Accreted oceanic terranes in Ecuador: Southern edge of the
... Coniacian-Maastrichtian age, or island arc / back-arc volcanic suites of Middle CampanianMiddle Maastrichtian age. The Piñón-Naranjal terrane recorded a comparable history, completed in the Maastrichtian-Paleocene, either by pelagic cherts, or by island arc products (Macuchi arc). The Late Cretaceou ...
... Coniacian-Maastrichtian age, or island arc / back-arc volcanic suites of Middle CampanianMiddle Maastrichtian age. The Piñón-Naranjal terrane recorded a comparable history, completed in the Maastrichtian-Paleocene, either by pelagic cherts, or by island arc products (Macuchi arc). The Late Cretaceou ...
44. Mesozoic-Cenozoic Geology of the Eastern Margin of the Grand
... described in a plate tectonic framework. In brief, the Mesozoic stratigraphy developed as a complex response to protracted rifting and continental breakup between the Late Triassic and the end of the Cretaceous. The Cenozoic stratigraphy, in contrast, is a relatively simple response to passive margi ...
... described in a plate tectonic framework. In brief, the Mesozoic stratigraphy developed as a complex response to protracted rifting and continental breakup between the Late Triassic and the end of the Cretaceous. The Cenozoic stratigraphy, in contrast, is a relatively simple response to passive margi ...
Mesozoic
The Mesozoic Era /mɛzɵˈzoʊɪk/ is an interval of geological time from about 252 to 66 million years ago. It is also called the Age of Reptiles, a phrase introduced by the 19th century paleontologist Gideon Mantell who viewed it as dominated by reptiles such as Iguanodon, Megalosaurus, Plesiosaurus and what are now called Pseudosuchia.Mesozoic means ""middle life"", deriving from the Greek prefix meso-/μεσο- for ""between"" and zōon/ζῷον meaning ""animal"" or ""living being"". It is one of three geologic eras of the Phanerozoic Eon, preceded by the Paleozoic (""ancient life"") and succeeded by the Cenozoic (""new life""). The era is subdivided into three major periods: the Triassic, Jurassic, and Cretaceous, which are further subdivided into a number of epochs and stages.The era began in the wake of the Permian–Triassic extinction event, the largest well-documented mass extinction in Earth's history, and ended with the Cretaceous–Paleogene extinction event, another mass extinction which is known for having killed off non-avian dinosaurs, as well as other plant and animal species. The Mesozoic was a time of significant tectonic, climate and evolutionary activity. The era witnessed the gradual rifting of the supercontinent Pangaea into separate landmasses that would eventually move into their current positions. The climate of the Mesozoic was varied, alternating between warming and cooling periods. Overall, however, the Earth was hotter than it is today. Non-avian dinosaurs appeared in the Late Triassic and became the dominant terrestrial vertebrates early in the Jurassic, occupying this position for about 135 million years until their demise at the end of the Cretaceous. Birds first appeared in the Jurassic, having evolved from a branch of theropod dinosaurs. The first mammals also appeared during the Mesozoic, but would remain small—less than 15 kg (33 lb)—until the Cenozoic.