Rheological heterogeneity, mechanical anisotropy
... dislocation creep; and it is assumed that the active mechanism is the one that requires the minimum work (Fig. 1). Vertical integration of the strength computed at different depths allows an evaluation of the total strength of a lithospheric column (England, 1983). The oversimplification of this app ...
... dislocation creep; and it is assumed that the active mechanism is the one that requires the minimum work (Fig. 1). Vertical integration of the strength computed at different depths allows an evaluation of the total strength of a lithospheric column (England, 1983). The oversimplification of this app ...
res terrae - Oulun yliopisto
... This thesis comprises six original papers that focus on the sedimentology of the Mesoproterozoic (1.6–1.0 Ga) Telemark basin-fills in southern Norway, known as the Telemark supracrustal rocks. It is made up of an approximately 10-km-thick succession of volcanic-sedimentary rocks that are an integral ...
... This thesis comprises six original papers that focus on the sedimentology of the Mesoproterozoic (1.6–1.0 Ga) Telemark basin-fills in southern Norway, known as the Telemark supracrustal rocks. It is made up of an approximately 10-km-thick succession of volcanic-sedimentary rocks that are an integral ...
Slab behaviour and its surface expression: new insights
... mandatory. By considering the tectonic evolution of a region, gravity modelling can be used to test different evolution models. This has the additional advantage that the density distribution at depth is explained by the tectonic evolution. No ‘‘mysterious’’ bodies with density contrasts that best f ...
... mandatory. By considering the tectonic evolution of a region, gravity modelling can be used to test different evolution models. This has the additional advantage that the density distribution at depth is explained by the tectonic evolution. No ‘‘mysterious’’ bodies with density contrasts that best f ...
Thermal and metamorphic environment of subduction zone episodic
... truncated at the tip of the mantle wedge to satisfy surface heat flow measurements. Note that the choice of mantle rheology does not significantly affect the temperatures calculated for the shallow fore arc, unless flow in the mantle wedge corner were to extend updip to depths <50 km, which would be ...
... truncated at the tip of the mantle wedge to satisfy surface heat flow measurements. Note that the choice of mantle rheology does not significantly affect the temperatures calculated for the shallow fore arc, unless flow in the mantle wedge corner were to extend updip to depths <50 km, which would be ...
Crustal thickening in Gansu-Qinghai, lithospheric mantle subduction
... the Tibet plateau grew predominantly towards the northeast or east-northeast, but only marginally towards the north-northwest. This was accomplished by the rise, in fairly fast succession, of the Arka Tagh, Qiman Tagh, Mahan shan, Tanghenan Shan, and other NW-trending mountain ranges splaying southe ...
... the Tibet plateau grew predominantly towards the northeast or east-northeast, but only marginally towards the north-northwest. This was accomplished by the rise, in fairly fast succession, of the Arka Tagh, Qiman Tagh, Mahan shan, Tanghenan Shan, and other NW-trending mountain ranges splaying southe ...
Dayem, K. E., G. A. Houseman, and P. Molnar (2009), Localization of shear along a lithospheric strength
... from the indenter. Superimposed is a secondary component of the deformation field, which decays away from the boundary of the strong region. Because the boundary of the strong region is oblique to the principal convergence direction, we expect the length scale of this secondary component to be inter ...
... from the indenter. Superimposed is a secondary component of the deformation field, which decays away from the boundary of the strong region. Because the boundary of the strong region is oblique to the principal convergence direction, we expect the length scale of this secondary component to be inter ...
Polyphasal brecciation history revealing the nature and depth of
... towards the contact with the bleached breccia unit, into which they continue (see next section). The quartz veins range between 1 mm and 10 cm in thickness with lengths up to 2 m, with dominant NNW–SSE and ENE–WSW orientations. Microtexturally, the quartz crystals within the veins have serrated boun ...
... towards the contact with the bleached breccia unit, into which they continue (see next section). The quartz veins range between 1 mm and 10 cm in thickness with lengths up to 2 m, with dominant NNW–SSE and ENE–WSW orientations. Microtexturally, the quartz crystals within the veins have serrated boun ...
Origins of the lower crustal reflectivity in the L¨utzow
... The shear velocity model derived from inversion is shown in the upper left of Fig. 3a. The observed radial receiver function after stacking the 11 events, and a synthetic receiver function obtained by assuming the inverted velocity model, are shown in the upper two traces of Fig. 3b. The shear veloc ...
... The shear velocity model derived from inversion is shown in the upper left of Fig. 3a. The observed radial receiver function after stacking the 11 events, and a synthetic receiver function obtained by assuming the inverted velocity model, are shown in the upper two traces of Fig. 3b. The shear veloc ...
Variations in magmatic processes along the East Greenland
... Müller (1994) suggested that the mantle plume was located beneath central Greenland in Late Cretaceous/Early Tertiary times (Fig. 1). Thus, the Tertiary volcanism of the North Atlantic margins prior to and during break-up is associated with mantle plume activity within a circle of radius of more th ...
... Müller (1994) suggested that the mantle plume was located beneath central Greenland in Late Cretaceous/Early Tertiary times (Fig. 1). Thus, the Tertiary volcanism of the North Atlantic margins prior to and during break-up is associated with mantle plume activity within a circle of radius of more th ...
Late Pliocene to Holocene platform evolution in northern Belize, and
... Silurian to Devonian granites are overlain by Upper Carboniferous to Middle Permian sedimentary, meta-sedimentary and volcanic rocks that, in turn, were deformed and intruded by granite during the Triassic. Surrounding the Maya Mountains are largely undeformed Jurassic siliciclastics, and Cretaceous ...
... Silurian to Devonian granites are overlain by Upper Carboniferous to Middle Permian sedimentary, meta-sedimentary and volcanic rocks that, in turn, were deformed and intruded by granite during the Triassic. Surrounding the Maya Mountains are largely undeformed Jurassic siliciclastics, and Cretaceous ...
OVERVIEW Tectonics of the Himalaya and southern Tibet from two
... of the Kohistan batholith (Searle, 1991). Farther south are progressively deeper elements of the Kohistan arc, including the spectacular gabbroic and ultramafic stratiform plutons of the Lower Cretaceous Chilas Complex (Khan et al., 1989; Mikoshiba et al., 1999) and highly deformed, mafic metavolcan ...
... of the Kohistan batholith (Searle, 1991). Farther south are progressively deeper elements of the Kohistan arc, including the spectacular gabbroic and ultramafic stratiform plutons of the Lower Cretaceous Chilas Complex (Khan et al., 1989; Mikoshiba et al., 1999) and highly deformed, mafic metavolcan ...
Document
... Discovered Reserves for Proven Carbonate Plays Total = 490,000 MOEB Discovered Reserves for Proven Evaporite Plays Total = 485,884 MOEB ...
... Discovered Reserves for Proven Carbonate Plays Total = 490,000 MOEB Discovered Reserves for Proven Evaporite Plays Total = 485,884 MOEB ...
Karson, J.A., and Lawrence, R.M., 1997.
... may be expressed in complex patterns of seismic reflectors seen in multichannel seismic reflection profiles of slow-spreading crust (Mutter and Karson, 1992; Morris et al., 1993). In this paper, we describe the tectonic setting of middle to lower crustal rocks exposed by major faulting on the Mid-At ...
... may be expressed in complex patterns of seismic reflectors seen in multichannel seismic reflection profiles of slow-spreading crust (Mutter and Karson, 1992; Morris et al., 1993). In this paper, we describe the tectonic setting of middle to lower crustal rocks exposed by major faulting on the Mid-At ...
V. C. Summer Nuclear Station, Units 2 and 3 COL Application
... Chillhowie Group (e.g., References 401, 351, 309, 334, and 305). These rocks, along with the basement and sedimentary cover, were later affected by Taconic and possibly Acadian deformation and metamorphism. The entire composite thrust sheet was transported west as an intact package during the Allegh ...
... Chillhowie Group (e.g., References 401, 351, 309, 334, and 305). These rocks, along with the basement and sedimentary cover, were later affected by Taconic and possibly Acadian deformation and metamorphism. The entire composite thrust sheet was transported west as an intact package during the Allegh ...
A FIRST GEOLOGICAL MAP OF MAKIRA, SOLOMON ISLANDS
... siltstones with occasional interbedded basaltic sheets. The HSG is at least 100m thick. The Kahua Breccia Group (KBG) comprises monolithic basalt breccias and bi-lithic basalt - limestone breccias which locally grade into coarse, poorly sorted sandstones and interbedded basalt sheets. The KBG is at ...
... siltstones with occasional interbedded basaltic sheets. The HSG is at least 100m thick. The Kahua Breccia Group (KBG) comprises monolithic basalt breccias and bi-lithic basalt - limestone breccias which locally grade into coarse, poorly sorted sandstones and interbedded basalt sheets. The KBG is at ...
Gravity modeling of the lithosphere in the Calatrava
... 7= Porzuna Syncline. 8= Alcudia Anticline. M= Mora. CR= Ciudad Real. AL= Almagro. VP= Valdepeñas. PL= Puertollano. AM= Almadén. AB= Abenojar. The inset map shows the NW-directed right-lateral Variscan shear zone (orange lines) and the regional arc which modify the trends of the axial fold traces fro ...
... 7= Porzuna Syncline. 8= Alcudia Anticline. M= Mora. CR= Ciudad Real. AL= Almagro. VP= Valdepeñas. PL= Puertollano. AM= Almadén. AB= Abenojar. The inset map shows the NW-directed right-lateral Variscan shear zone (orange lines) and the regional arc which modify the trends of the axial fold traces fro ...
Townend, J., Sutherland, R. and Toy, V., 2009. Deep Fault Drilling
... The Alpine Fault is a well-studied active continental fault that, unlike many other similar faults elsewhere, has not produced large earthquakes or measureable creep in historic times; however, paleoseismic data suggest that it has produced large earthquakes in the Holocene and that it is late in th ...
... The Alpine Fault is a well-studied active continental fault that, unlike many other similar faults elsewhere, has not produced large earthquakes or measureable creep in historic times; however, paleoseismic data suggest that it has produced large earthquakes in the Holocene and that it is late in th ...
Chapter 21: Metamorphism
... • If we heat a metamorphic rock until it melts, at what point in the melting process does it become “igneous”? • Xenoliths, restites, and other enclaves are considered part of the igneous realm because melt is dominant, but the distinction is certainly vague and disputable • Migmatites (“mixed rocks ...
... • If we heat a metamorphic rock until it melts, at what point in the melting process does it become “igneous”? • Xenoliths, restites, and other enclaves are considered part of the igneous realm because melt is dominant, but the distinction is certainly vague and disputable • Migmatites (“mixed rocks ...
Chapter 21: Metamorphism
... Staurolite zone. Schists with staurolite, biotite, muscovite, quartz, garnet, and plagioclase. Some chlorite may persist Kyanite zone. Schists with kyanite, biotite, muscovite, quartz, plagioclase, and usually garnet and staurolite Sillimanite zone. Schists and gneisses with sillimanite, biotite, mu ...
... Staurolite zone. Schists with staurolite, biotite, muscovite, quartz, garnet, and plagioclase. Some chlorite may persist Kyanite zone. Schists with kyanite, biotite, muscovite, quartz, plagioclase, and usually garnet and staurolite Sillimanite zone. Schists and gneisses with sillimanite, biotite, mu ...
CHAPTER 8 STRUCTURE
... deformed. Even the youngest Precambrian rocks – posttectonic A-type granites, dikes, and Ediacaran volcanic and sedimentary successions –are affected by faulting, are emplaced in extensional fractures, or are gently folded. To lesser or greater extent, also, virtually all the rocks in the shield are ...
... deformed. Even the youngest Precambrian rocks – posttectonic A-type granites, dikes, and Ediacaran volcanic and sedimentary successions –are affected by faulting, are emplaced in extensional fractures, or are gently folded. To lesser or greater extent, also, virtually all the rocks in the shield are ...
Neotectonics of the Offshore Oak Ridge Fault
... (Fig. 1) is the primary sediment source to the offshore area, and during late Quaternary low stands in sea level, this river and the Hueneme submarine canyon (Fig. 1) were linked to transport sediment southward from the Ventura basin to deep-water areas. A point important to the interpretation of se ...
... (Fig. 1) is the primary sediment source to the offshore area, and during late Quaternary low stands in sea level, this river and the Hueneme submarine canyon (Fig. 1) were linked to transport sediment southward from the Ventura basin to deep-water areas. A point important to the interpretation of se ...
geology - Krishikosh
... in 1879 and a second edition by R. D. Oldham was published in 1893. They were out of print by IglO or thereabouts. Students of geology were, however, fortunate in the publication, by Mr. D. N. Wadia, of his excellent book 'Geology of India' in I gIg, and the subsequent editions. For about a quarter ...
... in 1879 and a second edition by R. D. Oldham was published in 1893. They were out of print by IglO or thereabouts. Students of geology were, however, fortunate in the publication, by Mr. D. N. Wadia, of his excellent book 'Geology of India' in I gIg, and the subsequent editions. For about a quarter ...
Anomalous Occurrence of Cretaceous Placer Deposits: A
... strikes the structurally comparable Sevier belt of western USA. These mountains have extensive fold structures with ...
... strikes the structurally comparable Sevier belt of western USA. These mountains have extensive fold structures with ...
SESSIONE TS1.3 Processi magmatici e metamorfici nella crosta
... Composition typically ranges from tonalite to granite, but minor dioritic and gabbroic bodies are also present. Magma emplacement took place between 300 and 290 ± 10 Ma during the extensional tectonic stage, following collapse of the Hercynian belt. The heat advected by granitoids was considered res ...
... Composition typically ranges from tonalite to granite, but minor dioritic and gabbroic bodies are also present. Magma emplacement took place between 300 and 290 ± 10 Ma during the extensional tectonic stage, following collapse of the Hercynian belt. The heat advected by granitoids was considered res ...
Defining the Himalayan Main Central Thrust in Nepal
... Hodges et al. (1996) recognized several shear zones and thrusts across a ‘Main Central Thrust zone’ and mapped the southern limit of Main Central Thrust shearing close to the village of Lamdrung in the Modi khola. Searle & Godin (2003) mapped the entire inverted metamorphic sequence as being part of ...
... Hodges et al. (1996) recognized several shear zones and thrusts across a ‘Main Central Thrust zone’ and mapped the southern limit of Main Central Thrust shearing close to the village of Lamdrung in the Modi khola. Searle & Godin (2003) mapped the entire inverted metamorphic sequence as being part of ...