v. sulawesi - Vangorselslist
... (Crustal extension important in Neogene development of Sulawesi. North Arm with Eocene- Lower Miocene basalts intercalated with radiolarian chert and volcaniclastics, intruded by granitoids with zircon ages from~ 9.4- 8.2 Ma. Beneath these rocks is Malino Metamorphic core complex quartzo-feldspathic ...
... (Crustal extension important in Neogene development of Sulawesi. North Arm with Eocene- Lower Miocene basalts intercalated with radiolarian chert and volcaniclastics, intruded by granitoids with zircon ages from~ 9.4- 8.2 Ma. Beneath these rocks is Malino Metamorphic core complex quartzo-feldspathic ...
USGS Professional Paper 1697 - Alaska Resources Library and
... and geographic names for major regions. The major features, continued from the Neogene are (1) a series of continental-margin arcs and companion subduction-zone assemblages around the CircumNorth Pacific; (2) continuation of opening of major sedimentary basins behind major arcs; (3) in the eastern p ...
... and geographic names for major regions. The major features, continued from the Neogene are (1) a series of continental-margin arcs and companion subduction-zone assemblages around the CircumNorth Pacific; (2) continuation of opening of major sedimentary basins behind major arcs; (3) in the eastern p ...
Salt Plugs in the Eastern Zagros, Iran: Results of
... the hydratation of salts. Movement of glaciers can be very fast if supplied in salt from plug vent. No anomalously increased ...
... the hydratation of salts. Movement of glaciers can be very fast if supplied in salt from plug vent. No anomalously increased ...
Workshop Report - Consortium for Ocean Leadership
... mantle metasomatism, localized and regional deformation, formation and nature of plate boundaries, mechanisms of intermediate depth earthquakes, and both geochemistry and physical processes of low temperature alteration. The relevant earth science communities studying orogenic lherzolites, margin pe ...
... mantle metasomatism, localized and regional deformation, formation and nature of plate boundaries, mechanisms of intermediate depth earthquakes, and both geochemistry and physical processes of low temperature alteration. The relevant earth science communities studying orogenic lherzolites, margin pe ...
document - OurEnergyPolicy.org
... and Franklin, 2003; and Enegis, LLC). The envisioned CO2 plume is localized along the Permian basin detachment with traps localized within the Marathon subthrust facies (principally Ellenburger Dolomite). Contoured CO2 isograds given in percent contained gas and represents the CO2 source plume which ...
... and Franklin, 2003; and Enegis, LLC). The envisioned CO2 plume is localized along the Permian basin detachment with traps localized within the Marathon subthrust facies (principally Ellenburger Dolomite). Contoured CO2 isograds given in percent contained gas and represents the CO2 source plume which ...
physical, chemical, and chronological characteristics of
... the topic of several recent volumes [Fei et al., 1999; van der Hilst and McDonough, 1999; Fowler et al., 2002; Jones et al., 2004]. [3] Arguably, the most interesting aspect of the continental mantle is that it seems to assist in the long-term survival of continental crust, whereas the shallow ocean ...
... the topic of several recent volumes [Fei et al., 1999; van der Hilst and McDonough, 1999; Fowler et al., 2002; Jones et al., 2004]. [3] Arguably, the most interesting aspect of the continental mantle is that it seems to assist in the long-term survival of continental crust, whereas the shallow ocean ...
Cordierite in felsic igneous rocks: a synthesis
... these parameters are relatively low T, low P, and typically high (Mg+Fe2§ Mg/Fe2+, A/CNK, aAl20~, and fo2. Spatial and textural information indicate that cordierite may originate in one of three principal ways in felsic igneous rocks: Type 1 Metamorphic: (a) xenocrystic (generally anhedral, many inc ...
... these parameters are relatively low T, low P, and typically high (Mg+Fe2§ Mg/Fe2+, A/CNK, aAl20~, and fo2. Spatial and textural information indicate that cordierite may originate in one of three principal ways in felsic igneous rocks: Type 1 Metamorphic: (a) xenocrystic (generally anhedral, many inc ...
Zircon Behaviour in Deeply Subducted Rocks
... in equilibrium with these eclogitic minerals will thus be depleted in HREE relative to the middle REE (giving a flat chondrite-normalised HREE pattern with Lu/Gd < 3) and enriched in Eu (producing no negative Eu anomaly and with Eu/Euexpected > 0.75; FIG. 3). The peculiar trace element composition o ...
... in equilibrium with these eclogitic minerals will thus be depleted in HREE relative to the middle REE (giving a flat chondrite-normalised HREE pattern with Lu/Gd < 3) and enriched in Eu (producing no negative Eu anomaly and with Eu/Euexpected > 0.75; FIG. 3). The peculiar trace element composition o ...
Petrogenetic evolution of Uralian-Alaskan-type mafic
... Uralian-Alaskan-type mafic to ultramafic complexes form a narrow, 900 km long, N-Strending chain in the northern and central parts of the Ural orogenic belt. Characteristic features like their concentric lithologic zonation, the absence of orthopyroxene in the ultramafic rocks and platinum group ele ...
... Uralian-Alaskan-type mafic to ultramafic complexes form a narrow, 900 km long, N-Strending chain in the northern and central parts of the Ural orogenic belt. Characteristic features like their concentric lithologic zonation, the absence of orthopyroxene in the ultramafic rocks and platinum group ele ...
Rutile in eclogites as a mineral resource in the Sunnfjord
... many deposits for exploitation. Restrictions include the content of CaO in the rutile concentrate, which is due to the presence of calcium-bearing silicates as impurities. In sand deposits, the minerals are separated naturally by weathering, and the CaO in rutile concentrates will not normally be a ...
... many deposits for exploitation. Restrictions include the content of CaO in the rutile concentrate, which is due to the presence of calcium-bearing silicates as impurities. In sand deposits, the minerals are separated naturally by weathering, and the CaO in rutile concentrates will not normally be a ...
STP 3 & 4 2.5S.1 Basic Geologic and Seismic Information
... 2.5S.1.1.1.1 Gulf Coastal Plain Physiographic Province The Gulf Coastal Plain Physiographic Province (Figure 2.5S.1-6 [Reference 2.5S.112]) extends southeast and east from the edge of the Edwards Plateau, (Figure 2.5S.16 [Reference 2.5S.1-12]), 200 to 300 mi to the shore of the Gulf of Mexico. The G ...
... 2.5S.1.1.1.1 Gulf Coastal Plain Physiographic Province The Gulf Coastal Plain Physiographic Province (Figure 2.5S.1-6 [Reference 2.5S.112]) extends southeast and east from the edge of the Edwards Plateau, (Figure 2.5S.16 [Reference 2.5S.1-12]), 200 to 300 mi to the shore of the Gulf of Mexico. The G ...
STP 3 & 4 2.5S.1 Basic Geologic and Seismic Information
... 2.5S.1.1.1.1 Gulf Coastal Plain Physiographic Province The Gulf Coastal Plain Physiographic Province (Figure 2.5S.1-6 [Reference 2.5S.112]) extends southeast and east from the edge of the Edwards Plateau, (Figure 2.5S.16 [Reference 2.5S.1-12]), 200 to 300 mi to the shore of the Gulf of Mexico. The G ...
... 2.5S.1.1.1.1 Gulf Coastal Plain Physiographic Province The Gulf Coastal Plain Physiographic Province (Figure 2.5S.1-6 [Reference 2.5S.112]) extends southeast and east from the edge of the Edwards Plateau, (Figure 2.5S.16 [Reference 2.5S.1-12]), 200 to 300 mi to the shore of the Gulf of Mexico. The G ...
Reprint - Frederic MOUTHEREAU
... comprehensive scheme of the strain distribution over the whole collisional plate boundary. The Zagros foreland fold-thrust belt is particularly famous as the most prolific fold-thrust belt where the world's largest hydrocarbon reserves are trapped in giant anticlines (e.g.,Bordenave and Hegre, 2010). ...
... comprehensive scheme of the strain distribution over the whole collisional plate boundary. The Zagros foreland fold-thrust belt is particularly famous as the most prolific fold-thrust belt where the world's largest hydrocarbon reserves are trapped in giant anticlines (e.g.,Bordenave and Hegre, 2010). ...
STP 3 & 4
... 2.5S.1.1.1.4 Texas-Louisiana Slope The continental slope known as the Texas-Louisiana Slope off the shore of Texas covers 46,332 sq. mi of knoll-and-basin sea floor (Reference 2.5S.1-13). The average gradient is less than 1° but slopes greater than 20° are found near knolls and basins. The extreme c ...
... 2.5S.1.1.1.4 Texas-Louisiana Slope The continental slope known as the Texas-Louisiana Slope off the shore of Texas covers 46,332 sq. mi of knoll-and-basin sea floor (Reference 2.5S.1-13). The average gradient is less than 1° but slopes greater than 20° are found near knolls and basins. The extreme c ...
- Free Documents
... near the Scott Plateau. . Probably the prerift drift position of Sumba was at the southeastern most part of northwest Australia compared with prebreakup positions of the other continental fragments now occurring in eastern Indonesia. . Based on a seemingly confirmed Jurassic rift drift event in nort ...
... near the Scott Plateau. . Probably the prerift drift position of Sumba was at the southeastern most part of northwest Australia compared with prebreakup positions of the other continental fragments now occurring in eastern Indonesia. . Based on a seemingly confirmed Jurassic rift drift event in nort ...
Geological Survey of Denmark and Greenland Map Series 2
... conspicuous WNW–ESE-striking structural grain is caused by d2 dykes and the Thule half-graben system (see Fig. 35). The structure is essentially two tilted fault blocks – the Itillersuaq half-graben (in the north) and the Moriusaq half-graben – with the shield overlain by a normal, south-westerly di ...
... conspicuous WNW–ESE-striking structural grain is caused by d2 dykes and the Thule half-graben system (see Fig. 35). The structure is essentially two tilted fault blocks – the Itillersuaq half-graben (in the north) and the Moriusaq half-graben – with the shield overlain by a normal, south-westerly di ...
Plate dynamics, mantle structure and tectonic evolution of the
... The Wadati-Benioff zone to a depth of 300 km [Sykes and Ewing, 1965] confirmed the suggested subduction at the Lesser Antilles. The large relative motion was also recorded by the opening of the Cayman trough, a pull apart basin along the northern plate boundary and the only region in the Caribbean w ...
... The Wadati-Benioff zone to a depth of 300 km [Sykes and Ewing, 1965] confirmed the suggested subduction at the Lesser Antilles. The large relative motion was also recorded by the opening of the Cayman trough, a pull apart basin along the northern plate boundary and the only region in the Caribbean w ...
ATLAS of plutonic rocks and orthogneisses in the Bohemian Massif
... hot springs pour from granites in the same area e.g. in Karlovy Vary, Jáchymov or Teplice v Čechách. Almost 140 boreholes over 500 m deep were drilled in the Czech Republic into the granitic plutons (Suk and Ďurica 1991). Most of these boreholes are located in the areas of coal and/or gas basins whe ...
... hot springs pour from granites in the same area e.g. in Karlovy Vary, Jáchymov or Teplice v Čechách. Almost 140 boreholes over 500 m deep were drilled in the Czech Republic into the granitic plutons (Suk and Ďurica 1991). Most of these boreholes are located in the areas of coal and/or gas basins whe ...
Dyke swarm emplacement in the Ethiopian Large Igneous Province
... swarms, the NE^SW Serpent-God dyke swarm, and the NW^SE Dinder dyke swarm. Both swarms are thought to have the same age, 30 Ma, and are likely to have contributed to feeding the traps. After a description of the swarms, this paper examines their relationships with the basement structures. The two dy ...
... swarms, the NE^SW Serpent-God dyke swarm, and the NW^SE Dinder dyke swarm. Both swarms are thought to have the same age, 30 Ma, and are likely to have contributed to feeding the traps. After a description of the swarms, this paper examines their relationships with the basement structures. The two dy ...
Mantle-derived magmas and magmatic Ni-Cu-(PGE) deposits
... Melting can occur via a variety of different physical processes, including: 1) equilibrium (batch) melting in which the melt remains in equilibrium with the source, resulting in only moderate fractionation of highly from moderately incompatible elements; 2) fractional melting, in which the melt is c ...
... Melting can occur via a variety of different physical processes, including: 1) equilibrium (batch) melting in which the melt remains in equilibrium with the source, resulting in only moderate fractionation of highly from moderately incompatible elements; 2) fractional melting, in which the melt is c ...
Fulltext - ETH E-Collection
... Europe’s largest porphyry Cu-Au and epithermal Cu-Au deposits. However, the ore deposits are not evenly distributed within the arc and porphyry-type and epithermal deposits occur only in the central segments of the arc. Subsequently, the arc experienced intense deformation on a lithospheric scale, r ...
... Europe’s largest porphyry Cu-Au and epithermal Cu-Au deposits. However, the ore deposits are not evenly distributed within the arc and porphyry-type and epithermal deposits occur only in the central segments of the arc. Subsequently, the arc experienced intense deformation on a lithospheric scale, r ...
state of knowledge of the geothermal provinces of the
... as a result of the Red Sea, Aden gulf and East African rifts triple junction system, related to plate tectonic movements in the last 25-30 Ma. Adolei basalts characterize the first rupture movement within the Arabo-Nubian block which occurred during the later Miocene period (Figure 1). During these ...
... as a result of the Red Sea, Aden gulf and East African rifts triple junction system, related to plate tectonic movements in the last 25-30 Ma. Adolei basalts characterize the first rupture movement within the Arabo-Nubian block which occurred during the later Miocene period (Figure 1). During these ...
Subduction erosion modes: Comparing finite
... During subduction erosion, the upper plate is tectonically eroded by the subducting plate and carried into the mantle. The geological record suggests that subduction erosion is a fundamental process at subduction margins; however the underlying causes are not well constrained. Finite-element numeric ...
... During subduction erosion, the upper plate is tectonically eroded by the subducting plate and carried into the mantle. The geological record suggests that subduction erosion is a fundamental process at subduction margins; however the underlying causes are not well constrained. Finite-element numeric ...
- CSUN ScholarWorks - California State University
... quartzofeldspathic rocks in the Whipple Mountains suggest that quartzofeldspathic rocks with >60 modal percent feldspar are up to five times stronger than quartzites (Hacker, 1992). Therefore the modal percentage of feldspar in continental crustal rocks likely plays a major role in affecting crustal ...
... quartzofeldspathic rocks in the Whipple Mountains suggest that quartzofeldspathic rocks with >60 modal percent feldspar are up to five times stronger than quartzites (Hacker, 1992). Therefore the modal percentage of feldspar in continental crustal rocks likely plays a major role in affecting crustal ...
Great Lakes tectonic zone
The Great Lakes tectonic zone is bounded by South Dakota at its tip and heads northeast to south of Duluth, Minnesota, then heads east through northern Wisconsin, Marquette, Michigan, and then trends more northeasterly to skim the northern-most shores of lakes Michigan and Huron before ending in the Sudbury, Ontario, Canada, area.During the Late Archean Era the Algoman orogeny added landmass to the Superior province by volcanic activity and continental collision along a boundary that stretches from present-day South Dakota, U.S., into the Lake Huron region near Sudbury, Ontario, Canada.This crustal boundary is the Great Lakes tectonic zone. It is 1,400 km (870 mi) long, and separates the older Archean gneissic terrane to the south from younger Late Archean greenstone-granite terrane to the north.The zone is characterized by active compression during the Algoman orogeny (about 2,700 million years ago), a pulling-apart (extensional) tectonics (2,450 to 2,100 million years ago), a second compression during the Penokean orogeny (1,900 to 1,850 million years ago), a second extension during Middle Proterozoic time (1,600 million years ago) and minor reactivation during Phanerozoic time (the past 500 million years).Collision began along the Great Lakes tectonic zone (GLTZ) with the Algoman mountain-building event and continued for tens of millions of years. During the formation of the GLTZ, the gneissic Minnesota River Valley subprovince was thrust up onto the Superior province's edge as it consumed the Superior province's oceanic crust. Fragmentation of the Kenorland supercontinent began 2,450 million years ago and was completed by 2,100 million years ago. The Wyoming province is the continental landmass that is hypothesized to have rifted away from the southern Superior province portion of Kenorland, before moving rapidly west and docking with the Laurentia supercontinent 1,850 to 1,715 million years ago. Sedimentation from the GLTZ-rifting environment continued into the Penokean orogeny, which is the next major tectonic event in the Great Lakes region. Several earthquakes have been documented in Minnesota, Michigan's Upper Peninsula and Sudbury in the last 120 years along the GLTZ.