Setting Based Classification
... Polymetamorphic rocks are common, usually representing an orogenic event followed by a contact one • Spotted phyllite (or slate) • Overprint may be due to: – Lag time between the creation of the magma at depth during T maximum, and its migration to the lower grade rocks above ...
... Polymetamorphic rocks are common, usually representing an orogenic event followed by a contact one • Spotted phyllite (or slate) • Overprint may be due to: – Lag time between the creation of the magma at depth during T maximum, and its migration to the lower grade rocks above ...
Unraveling the alteration history of the basement rocks along the P2
... • Predominately in chloritized, graphitic metapelite • Alteration profile is preserved but it’s lateral continuity is not • Ie. mixing of Green & Red Zones with sporadic bleaching • Occurs at depths of up to 200 m below the unconformity ...
... • Predominately in chloritized, graphitic metapelite • Alteration profile is preserved but it’s lateral continuity is not • Ie. mixing of Green & Red Zones with sporadic bleaching • Occurs at depths of up to 200 m below the unconformity ...
The Imbert Formation of northern Hispaniola: a tectono
... Abstract. In northern Hispaniola, the Imbert Formation (Fm) has been interpreted as an orogenic “mélange” originally deposited as trench-fill sediments, an accretionary (subduction) complex formed above a SW-dipping subduction zone, or the sedimentary result of the early oblique collision of the Car ...
... Abstract. In northern Hispaniola, the Imbert Formation (Fm) has been interpreted as an orogenic “mélange” originally deposited as trench-fill sediments, an accretionary (subduction) complex formed above a SW-dipping subduction zone, or the sedimentary result of the early oblique collision of the Car ...
Arkosic rocks from the San Andreas Fault
... blocks defined by bedding orientations, wireline log character, physical properties, and lithologic characteristics. A clay-rich zone between 2530 and 2680 mmd is characterized by low Vp and an enlarged borehole. The lower arkose lies between 2680 and 3150 mmd. Fission-track detrital zircon cooling ...
... blocks defined by bedding orientations, wireline log character, physical properties, and lithologic characteristics. A clay-rich zone between 2530 and 2680 mmd is characterized by low Vp and an enlarged borehole. The lower arkose lies between 2680 and 3150 mmd. Fission-track detrital zircon cooling ...
Impact of lower plate structure on upper plate
... accretionary wedge where thrust (fault bend fold) type anticlines are commonly observed in nature (Suppe, 1983; Flueh et al., 1998), analogic models (Gutscher et al., 1998) and seismic data from the region (e.g., Singh et al., 2006; Sibuet et al., 2007; Franke et al., 2006 and Gaedicke et al., 2006 ...
... accretionary wedge where thrust (fault bend fold) type anticlines are commonly observed in nature (Suppe, 1983; Flueh et al., 1998), analogic models (Gutscher et al., 1998) and seismic data from the region (e.g., Singh et al., 2006; Sibuet et al., 2007; Franke et al., 2006 and Gaedicke et al., 2006 ...
Kinematic model for the Main Central thrust in Nepal
... Nepal (DeCelles et al., 2001), and the floor thrust is the Main Himalayan thrust (Hauck et al., 1998). In western Nepal, the growth of the duplex commenced with the emplacement of the Ramgarh thrust sheet along a regional footwall flat (Fig. 2C). Thrust sheets of Lesser Himalayan rocks were subseque ...
... Nepal (DeCelles et al., 2001), and the floor thrust is the Main Himalayan thrust (Hauck et al., 1998). In western Nepal, the growth of the duplex commenced with the emplacement of the Ramgarh thrust sheet along a regional footwall flat (Fig. 2C). Thrust sheets of Lesser Himalayan rocks were subseque ...
Mechanical (de-)coupling of the lithosphere in the Valencia Trough
... in the troughs of the basin and constitute a moderate amount of the total in¢ll. Although post-rift sequences are abundant, the basin is partly sediment-starved [31], being constantly in¢lled by material eroded mainly from the £anking ranges (Catalan Coastal Ranges and Iberian Chain) and transported ...
... in the troughs of the basin and constitute a moderate amount of the total in¢ll. Although post-rift sequences are abundant, the basin is partly sediment-starved [31], being constantly in¢lled by material eroded mainly from the £anking ranges (Catalan Coastal Ranges and Iberian Chain) and transported ...
Evolution of the southeastern Lachlan Fold Belt in Victoria
... Mt Wellington Fault Zone) and was juxtaposed against the Melbourne Zone in a process beginning in the Silurian and culminating about the Middle Devonian. VandenBerg and Stewart (1992) favoured the model of Fergusson et al. (1986) because it is consistent with the distribution of lithofacies in Ordov ...
... Mt Wellington Fault Zone) and was juxtaposed against the Melbourne Zone in a process beginning in the Silurian and culminating about the Middle Devonian. VandenBerg and Stewart (1992) favoured the model of Fergusson et al. (1986) because it is consistent with the distribution of lithofacies in Ordov ...
Density constraints on the formation of the continental Moho and crust
... has been mixing of continental crust and mantle on a large scale will render this interpretation ambiguous (Fyfe 1981). Regardless of whether the mass of the continental crust has grown or has been conserved with time, the isotopic data indicate that large volumes of calcalkaline magmas could have o ...
... has been mixing of continental crust and mantle on a large scale will render this interpretation ambiguous (Fyfe 1981). Regardless of whether the mass of the continental crust has grown or has been conserved with time, the isotopic data indicate that large volumes of calcalkaline magmas could have o ...
A crustal transect across the Oman Mountains
... order to rectify this omission, we made a 255-km-long, southwesterly oriented crustal transect of the Oman Mountains from the Coastal Zone to the interior Foreland via the 3,000-m-high Jebel Akhdar. The model for the upper 8 km of the crust was constrained using 152 km of 2-D seismic reflection prof ...
... order to rectify this omission, we made a 255-km-long, southwesterly oriented crustal transect of the Oman Mountains from the Coastal Zone to the interior Foreland via the 3,000-m-high Jebel Akhdar. The model for the upper 8 km of the crust was constrained using 152 km of 2-D seismic reflection prof ...
Document
... and into the in situ middle crust that may be a nucleus of continental crust. The average continental crust possesses an intermediate composition (~60 wt.% SiO2), which raises the question of how intra-oceanic arcs produce continental crust if the dominant product of mantle wedge melting and a major ...
... and into the in situ middle crust that may be a nucleus of continental crust. The average continental crust possesses an intermediate composition (~60 wt.% SiO2), which raises the question of how intra-oceanic arcs produce continental crust if the dominant product of mantle wedge melting and a major ...
ESS 8 - Earthquakes
... 50 people died, and 50,000 were left homeless. The epicenter was in L'Aquila (Abruzzo Region), a medieval fortress hill town, where a number of people were ...
... 50 people died, and 50,000 were left homeless. The epicenter was in L'Aquila (Abruzzo Region), a medieval fortress hill town, where a number of people were ...
Insights into the structure of the upper mantle beneath the Murray
... The east – west cross-sections through the checkerboard inversion model (Figure 6b) generally exhibit good recovery, although there is some smearing of structure towards the edge of the array caused by a predominance of paths with similar orientations. The north – south cross-sections (Figure 6c) al ...
... The east – west cross-sections through the checkerboard inversion model (Figure 6b) generally exhibit good recovery, although there is some smearing of structure towards the edge of the array caused by a predominance of paths with similar orientations. The north – south cross-sections (Figure 6c) al ...
Baltica in the Cryogenian, 850–630 Ma
... al., 2006). Polyphase deformation and partial migmatisation precludes reliable observations of possible lateral facies changes, particularly within the Seve Nappe Complex. Neoproterozoic to early Cambrian sediments were also deposited off the initial rift axis on top of the crystalline plat- ...
... al., 2006). Polyphase deformation and partial migmatisation precludes reliable observations of possible lateral facies changes, particularly within the Seve Nappe Complex. Neoproterozoic to early Cambrian sediments were also deposited off the initial rift axis on top of the crystalline plat- ...
Dike induced Faults
... II inclined normal fault (Fig. 4b). The local stress field is affected by variation in stresses because of magma supply and brittle faulting. A normal fault concentrates stresses in its tip zone and releases stress on both sides (Pollard and Aydin, 1984). The fault continues its growing and propagat ...
... II inclined normal fault (Fig. 4b). The local stress field is affected by variation in stresses because of magma supply and brittle faulting. A normal fault concentrates stresses in its tip zone and releases stress on both sides (Pollard and Aydin, 1984). The fault continues its growing and propagat ...
The Relevance of Brittle Fault Zones in Tunnel Construction
... In tunnel engineering, zones of rock affected by brittle deformation cause problems. Frequently, they call for special tunnelling methods, which in turn lead to higher costs for the contractor. In some cases, due to incalculable safety risks or for economic reasons, further advance is impossible. Ga ...
... In tunnel engineering, zones of rock affected by brittle deformation cause problems. Frequently, they call for special tunnelling methods, which in turn lead to higher costs for the contractor. In some cases, due to incalculable safety risks or for economic reasons, further advance is impossible. Ga ...
Deep-sea basins of the Atlantic ocean
... Argentine Basin. This basin is one of the largest basins in the South Atlantic Ocean (Figure 1). It is bounded by the South American continental slope in the west, its eastern limitation being the slope of the Mid-Atlantic Ridge. In the north it is bounded by the São Paulo continental protrusion (s ...
... Argentine Basin. This basin is one of the largest basins in the South Atlantic Ocean (Figure 1). It is bounded by the South American continental slope in the west, its eastern limitation being the slope of the Mid-Atlantic Ridge. In the north it is bounded by the São Paulo continental protrusion (s ...
Post-Paleozoic activity
... paleolatitude 70° to 60° (Robinson, 1973). It had an area of about 184 x lo6 km2, a broad central arch rising about 1.7 km and 720 km across, and an average elevation in excess of 1,300 m above Early Mesozoic sea level (Hay and others, 1981). The southern and central Appalachians, which had underg ...
... paleolatitude 70° to 60° (Robinson, 1973). It had an area of about 184 x lo6 km2, a broad central arch rising about 1.7 km and 720 km across, and an average elevation in excess of 1,300 m above Early Mesozoic sea level (Hay and others, 1981). The southern and central Appalachians, which had underg ...
39. crustal structure along the leg 152 drilling transect
... Greenland dips through a normally faulted, seaward-facing flexure zone below the landward feather edge of the seaward-dipping reflector sequence (SDRS), which is subaerially erupted basaltic lavas. Associated with the flexure zone, the continental crust thins from approximately 28 km thick to almost ...
... Greenland dips through a normally faulted, seaward-facing flexure zone below the landward feather edge of the seaward-dipping reflector sequence (SDRS), which is subaerially erupted basaltic lavas. Associated with the flexure zone, the continental crust thins from approximately 28 km thick to almost ...
pdf - Geological Society of Malaysia
... of the nature of these three belts. However, the demarcation of the boundaries is still problematical and a few proposals have been made. They are shown in Fig. 2. It can be seen that proposals taking the eastern foothills of the Main Range Granite to be the boundary between the Central and Western ...
... of the nature of these three belts. However, the demarcation of the boundaries is still problematical and a few proposals have been made. They are shown in Fig. 2. It can be seen that proposals taking the eastern foothills of the Main Range Granite to be the boundary between the Central and Western ...
Sedimentary record of the tectonic growth of a collisional continental
... Nutzotin basin formed as a retroarc foreland basin along the northern margin (present coordinates) of the Wrangellia terrane. Coeval with basin development along the northern margin, sedimentary basins and plutons located along the southern margin of the Wrangellia terrane were being incorporated in ...
... Nutzotin basin formed as a retroarc foreland basin along the northern margin (present coordinates) of the Wrangellia terrane. Coeval with basin development along the northern margin, sedimentary basins and plutons located along the southern margin of the Wrangellia terrane were being incorporated in ...
A narrowly spaced double-seismic zone in the subducting Nazca plate
... [10] In the subducting oceanic crust at intermediate depths, eclogite formation is the most dominant source for water. This transformation is accompanied by a density increase and thus up to 10% volume reduction that induces a stretching deformation in the oceanic crust [Kirby et al., 1996]. The str ...
... [10] In the subducting oceanic crust at intermediate depths, eclogite formation is the most dominant source for water. This transformation is accompanied by a density increase and thus up to 10% volume reduction that induces a stretching deformation in the oceanic crust [Kirby et al., 1996]. The str ...
STATE GEOLOGICAL MAP OF UKRAINE
... m height). This part of the area is of medium-mountain type, extensively eroded, with narrow ridges, steep (2540o) slopes, narrow river and stream valleys, and altitudes 400-800 to 1000 m. Mountain slopes are overgrown with beech forests, and at the watersheds Alpine meadows (polonyny) are developed ...
... m height). This part of the area is of medium-mountain type, extensively eroded, with narrow ridges, steep (2540o) slopes, narrow river and stream valleys, and altitudes 400-800 to 1000 m. Mountain slopes are overgrown with beech forests, and at the watersheds Alpine meadows (polonyny) are developed ...
The structure of the upper mantle beneath the Delamerian and
... a large region. In the mantle lithosphere immediately below the crust (~ 50 km depth), dominant variations in velocity tend to strike east–west, and share little resemblance to Palaeozoic boundaries in the shallow crust inferred from surface geology and potential field data. A broad region of elevate ...
... a large region. In the mantle lithosphere immediately below the crust (~ 50 km depth), dominant variations in velocity tend to strike east–west, and share little resemblance to Palaeozoic boundaries in the shallow crust inferred from surface geology and potential field data. A broad region of elevate ...
Bresse Graben System, European Crust and Topo Europe
... 2. The European Cenozoic Rift System The European Cenozoic Rift System (ECRIS) is an 1100 km long rift system between the Mediterranean Sea and the North Sea that began to form during the late Eocene. There are six different rifts in Central Europe that belong to the Cenozoic Rift System: Limagne Gr ...
... 2. The European Cenozoic Rift System The European Cenozoic Rift System (ECRIS) is an 1100 km long rift system between the Mediterranean Sea and the North Sea that began to form during the late Eocene. There are six different rifts in Central Europe that belong to the Cenozoic Rift System: Limagne Gr ...