In-Situ Plate Tectonic Model of the Gulf of Mexico (GOM) and
... processes in the east and the corresponding, mainly compressional regime, in the west. The present-day tectonics illustrates a series of active and extinct spreading centres. Understanding the timing and direction of these centres is critical in understanding how the continental to mixed plates move ...
... processes in the east and the corresponding, mainly compressional regime, in the west. The present-day tectonics illustrates a series of active and extinct spreading centres. Understanding the timing and direction of these centres is critical in understanding how the continental to mixed plates move ...
Document
... Small, spherical, heat-emitting probe could reach depths well in excess of 100 km below the surface of both oceanic and continental crust. Initial penetration of the crust would be very rapid and worthwhile depths in the mantle could be reached in ~35 years. The acoustic signals generated during the ...
... Small, spherical, heat-emitting probe could reach depths well in excess of 100 km below the surface of both oceanic and continental crust. Initial penetration of the crust would be very rapid and worthwhile depths in the mantle could be reached in ~35 years. The acoustic signals generated during the ...
GEOLOGY OF THE BUCHANS–ROBERTS ARM VOLCANIC BELT
... One of the more distinctive rock units in the Gullbridge tract is represented by a unique lithodemic assemblage of interbedded volcanic and sedimentary strata (Unit Gh). Rocks in this map unit are interpreted to stratigraphically overlie the purplish-red replacement chert at the top of the bimodal p ...
... One of the more distinctive rock units in the Gullbridge tract is represented by a unique lithodemic assemblage of interbedded volcanic and sedimentary strata (Unit Gh). Rocks in this map unit are interpreted to stratigraphically overlie the purplish-red replacement chert at the top of the bimodal p ...
Document
... - lithology often consists of oolites (sand-size grains of limestone), stromatolites (algal-built structures), skeletal debris, coal, and evaporites - sedimentary structures often consist of repetitive fining-upward sequences of sand, silt and clay J. Organic Reefs - solid but porous limestone struc ...
... - lithology often consists of oolites (sand-size grains of limestone), stromatolites (algal-built structures), skeletal debris, coal, and evaporites - sedimentary structures often consist of repetitive fining-upward sequences of sand, silt and clay J. Organic Reefs - solid but porous limestone struc ...
yosemite national park
... Formation of the area one factor that helped shape Yosemite is the fact that sediment deposited in shallow water and those rocks where metamorphosed. Another factor is the history of volcanic activity. Also, movement along the sierra fault caused sierra Nevada to uplift which created the many dome ...
... Formation of the area one factor that helped shape Yosemite is the fact that sediment deposited in shallow water and those rocks where metamorphosed. Another factor is the history of volcanic activity. Also, movement along the sierra fault caused sierra Nevada to uplift which created the many dome ...
The Laramide Orogeny: What Were the Driving Forces?
... deformation, then orogenesis was ultimately driven by the subducting oceanic slab. Plate reconstruction models indicate that the Kula and Farallon oceanic plates, separated by a spreading center, were subducting beneath western North America during Laramide time (e.g., Engebretson et al., 1985; Kell ...
... deformation, then orogenesis was ultimately driven by the subducting oceanic slab. Plate reconstruction models indicate that the Kula and Farallon oceanic plates, separated by a spreading center, were subducting beneath western North America during Laramide time (e.g., Engebretson et al., 1985; Kell ...
The Laramide Orogeny - University of Nevada, Reno
... deformation, then orogenesis was ultimately driven by the subducting oceanic slab. Plate reconstruction models indicate that the Kula and Farallon oceanic plates, separated by a spreading center, were subducting beneath western North America during Laramide time (e.g., Engebretson et al., 1985; Kell ...
... deformation, then orogenesis was ultimately driven by the subducting oceanic slab. Plate reconstruction models indicate that the Kula and Farallon oceanic plates, separated by a spreading center, were subducting beneath western North America during Laramide time (e.g., Engebretson et al., 1985; Kell ...
Flood basalts, continental breakup and the dispersal of
... The causes of repeated supercontinent breakups following intraplate deformation and intensive magmatic outpouring are still a controversial issue (Bott, 1992; Storey, 1995; Sheth, 1999). Although some models suggest lithospheric extension and magmatism in response to subduction (Storey et al., 1992) ...
... The causes of repeated supercontinent breakups following intraplate deformation and intensive magmatic outpouring are still a controversial issue (Bott, 1992; Storey, 1995; Sheth, 1999). Although some models suggest lithospheric extension and magmatism in response to subduction (Storey et al., 1992) ...
New Horizons: The Exploration of the Pluto System and the Kuiper
... engines to target the flyby of a small (~40 km diameter), cold classical Kuiper Belt Object (KBO) designated 2014 MU69. The spacecraft will fly past this object, at much closer range than it did Pluto, on 1 January 2019. If NASA approves this extended mission, this KBO will be mapped for geology, al ...
... engines to target the flyby of a small (~40 km diameter), cold classical Kuiper Belt Object (KBO) designated 2014 MU69. The spacecraft will fly past this object, at much closer range than it did Pluto, on 1 January 2019. If NASA approves this extended mission, this KBO will be mapped for geology, al ...
Fast spreading ridges
... across-axis bathymetry of slow and fast ridges differ in terms of magmatic, tectonic and hydrothermal processes that form the crust ...
... across-axis bathymetry of slow and fast ridges differ in terms of magmatic, tectonic and hydrothermal processes that form the crust ...
lecture7_tomo
... 2. Other arcs show the effect of addition of different continental components to source, most likely Atlantic sediment (Antilles) or Pacific sediment (Banda, New Zealand). The basaltic lavas are more enriched in radioactive elements (more “original” or “primordial”) and more gassed. These are often ...
... 2. Other arcs show the effect of addition of different continental components to source, most likely Atlantic sediment (Antilles) or Pacific sediment (Banda, New Zealand). The basaltic lavas are more enriched in radioactive elements (more “original” or “primordial”) and more gassed. These are often ...
Igneous Rock Associations 8. Arc Magmatism II: Geo
... eclogite at depth in the vicinity of the subducted oceanic slab. Water released from dehydration invades the overlying mantle wedge causing melting in the mantle. Rising mafic magmas may underplate the crust. (a) Subduction of denser (and older) oceanic lithosphere beneath less dense lithosphere to ...
... eclogite at depth in the vicinity of the subducted oceanic slab. Water released from dehydration invades the overlying mantle wedge causing melting in the mantle. Rising mafic magmas may underplate the crust. (a) Subduction of denser (and older) oceanic lithosphere beneath less dense lithosphere to ...
Trace element evidence from seamounts for recycled oceanic crust
... of different ratios and all are consistent with such two-component mixing. The mixing curves can be linear or hyperbolic w23,24x on ratio–ratio diagrams, depending on the differences in relative incompatibility between the two elements in the numerator and in the denominator. The hyperbolic plots, h ...
... of different ratios and all are consistent with such two-component mixing. The mixing curves can be linear or hyperbolic w23,24x on ratio–ratio diagrams, depending on the differences in relative incompatibility between the two elements in the numerator and in the denominator. The hyperbolic plots, h ...
Najman, et al., 1997 - Lancaster University
... Limited age information for the lower Tertiary sedimentary rocks can be gained from stratigraphy, paleontology, and paleomagnetic studies. The conformably underlying Subathu Formation is paleontologically dated as extending from the Paleocene to the early part of the middle Eocene (Mathur, 1978). A ...
... Limited age information for the lower Tertiary sedimentary rocks can be gained from stratigraphy, paleontology, and paleomagnetic studies. The conformably underlying Subathu Formation is paleontologically dated as extending from the Paleocene to the early part of the middle Eocene (Mathur, 1978). A ...
Continental geotherm and the evolution of rifted margins
... base of cratonic lithosphere from heat flow models (Jaupart et al., 1998), expected values of thermal conductivity and heat production in the mantle, and heat flow across the cratonic Moho (Jaupart and Mareschal, 1999). More globally, variations in the depths to the 410 and 660 km discontinuities im ...
... base of cratonic lithosphere from heat flow models (Jaupart et al., 1998), expected values of thermal conductivity and heat production in the mantle, and heat flow across the cratonic Moho (Jaupart and Mareschal, 1999). More globally, variations in the depths to the 410 and 660 km discontinuities im ...
Provenance of zircon of the lowermost sedimentary cover, Estonia
... KONSA, MARE and PUURA, VÄINÖ 1999. Provenance of zircon of the lowermost sedimentary cover, Estonia, East-European Craton. Bulletin of the Geological Society of Finland, Number 71, Part 2, 253-273. Bulk and accessory mineral composition of fresh and weathered crystalline rocks, and sedimentary depos ...
... KONSA, MARE and PUURA, VÄINÖ 1999. Provenance of zircon of the lowermost sedimentary cover, Estonia, East-European Craton. Bulletin of the Geological Society of Finland, Number 71, Part 2, 253-273. Bulk and accessory mineral composition of fresh and weathered crystalline rocks, and sedimentary depos ...
Nicholson et al., 1997 - University of Minnesota Duluth
... during reconnaissance fieldwork in the last 2 years. There appears to be a thin interval of flows with normal polarity at the base of the upper member. The stratigraphic thickness of this interval has not yet been delineated and exposure is limited; however, most of the upper KCV elsewhere has rever ...
... during reconnaissance fieldwork in the last 2 years. There appears to be a thin interval of flows with normal polarity at the base of the upper member. The stratigraphic thickness of this interval has not yet been delineated and exposure is limited; however, most of the upper KCV elsewhere has rever ...
P-wave velocity structure in the central Japan Basin, Japan
... 9-km thick crust, including a 1.5-km thick sedimentary layer. Figure 4 shows a comparison of the crustal velocity model of this study with those of 3 to 15 Ma old oceanic crust in the Pacific Ocean [White et al., 1992]. The thickness of the upper part of crust (3.8-4.3, 4.7-5.1 and 5.9-6.2 km/s) in ...
... 9-km thick crust, including a 1.5-km thick sedimentary layer. Figure 4 shows a comparison of the crustal velocity model of this study with those of 3 to 15 Ma old oceanic crust in the Pacific Ocean [White et al., 1992]. The thickness of the upper part of crust (3.8-4.3, 4.7-5.1 and 5.9-6.2 km/s) in ...
Chapter 22 Evidence for Early and Mid
... Abstract: Evidence of Early- to Mid-Cryogenian (c. 780 Ma and c. 740 Ma) glacial activity is summarized for the northern Arabian–Nubian Shield (ANS), including structural framework, stratigraphy, lithological descriptions and relationships with younger and older units, banded iron formation chemostr ...
... Abstract: Evidence of Early- to Mid-Cryogenian (c. 780 Ma and c. 740 Ma) glacial activity is summarized for the northern Arabian–Nubian Shield (ANS), including structural framework, stratigraphy, lithological descriptions and relationships with younger and older units, banded iron formation chemostr ...
Unconformable and cross-cutting relationships indicate major
... the apparent ductile nature of this folding indicated slip during late Proterozoic metamorphic conditions. Karlstrom and Daniel (1993) contested the nature of this deformation, however, saying that the folding may have been generated by distributed brittle deformation. They attributed the major stri ...
... the apparent ductile nature of this folding indicated slip during late Proterozoic metamorphic conditions. Karlstrom and Daniel (1993) contested the nature of this deformation, however, saying that the folding may have been generated by distributed brittle deformation. They attributed the major stri ...
The Origin of Ocean Basins
... events leading to the formation, expansion, contracting and eventual elimination of ocean basins. • Stages in basin history are: – Embryonic - rift valley forms as continent begins to ...
... events leading to the formation, expansion, contracting and eventual elimination of ocean basins. • Stages in basin history are: – Embryonic - rift valley forms as continent begins to ...
Mesozoic extensional and strike-slip fault systems in magmatic arc
... Plutonic rocks no\. exposed in the h4iddle Jurassic to Early Cretaceous magmatic arc of northern Chile were empIaced between c. 153 Ma and c. 126 Ma at high levels in the crust - above the regional ductilebrittle transition. This is known because of the concordance of mineral and whole-rock cooling ...
... Plutonic rocks no\. exposed in the h4iddle Jurassic to Early Cretaceous magmatic arc of northern Chile were empIaced between c. 153 Ma and c. 126 Ma at high levels in the crust - above the regional ductilebrittle transition. This is known because of the concordance of mineral and whole-rock cooling ...
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... et al., 1992). For the southern Oklahoma aulacogen, which is a failed rift, this model requires that the lattice-preferred orientation in the asthenosphere has survived the 540 m.y. since the rift became inactive and during the process when the asthenosphere was cooling to become lithosphere. Given ...
... et al., 1992). For the southern Oklahoma aulacogen, which is a failed rift, this model requires that the lattice-preferred orientation in the asthenosphere has survived the 540 m.y. since the rift became inactive and during the process when the asthenosphere was cooling to become lithosphere. Given ...
The Tien Shan Early Paleozoic tectonics and geodynamics
... rocks are widespread in the region discussed. (Figure 3). The diamictite, dated Vendian, are overlain with a stratigraphic unconformity, recorded by a weathering crust, are overlain by a sequence of siliceous and carbonate rocks (Shortor, Baidamtal, Berkut, and other formations, ranging from 100 m t ...
... rocks are widespread in the region discussed. (Figure 3). The diamictite, dated Vendian, are overlain with a stratigraphic unconformity, recorded by a weathering crust, are overlain by a sequence of siliceous and carbonate rocks (Shortor, Baidamtal, Berkut, and other formations, ranging from 100 m t ...
Extensional origin of ductile fabrics in the Schist Belt, Central Brooks
... depositionally overlie metabasalt along a marked angular unconformity (Dillon et al. 1981). An unexposed Sdipping fault, here termed the Angayucham Fault, separates Angayucham metabasalt from the structurally underlying MP unit (Fig. 2). This fault zone is inferred to be equivalent to the Angayucham ...
... depositionally overlie metabasalt along a marked angular unconformity (Dillon et al. 1981). An unexposed Sdipping fault, here termed the Angayucham Fault, separates Angayucham metabasalt from the structurally underlying MP unit (Fig. 2). This fault zone is inferred to be equivalent to the Angayucham ...
Baltic Shield
The Baltic Shield (sometimes referred to as the Fennoscandian Shield) is located in Fennoscandia (Norway, Sweden and Finland), northwest Russia and under the Baltic Sea. The Baltic Shield is defined as the exposed Precambrian northwest segment of the East European Craton. It is composed mostly of Archean and Proterozoic gneisses and greenstones which have undergone numerous deformations through tectonic activity (see Geology of Fennoscandia map [1]). The Baltic Shield contains the oldest rocks of the European continent. The lithospheric thickness is about 200-300 km. During the Pleistocene epoch, great continental ice sheets scoured and depressed the shield's surface, leaving a thin covering of glacial material and innumerable lakes and streams. The Baltic Shield is still rebounding today following the melting of the thick glaciers during the Quaternary Period.