Mesozoic extensional and strike-slip fault systems in magmatic arc
... conventional subdivision of tectonic units at convergent plate margins tends to obscure an important unifying aspect of the archck-arc couplet, namely the linked fault system responsible for the overall extension of the convergent plate bounclary zone. We have studied deformation and magma emplaceme ...
... conventional subdivision of tectonic units at convergent plate margins tends to obscure an important unifying aspect of the archck-arc couplet, namely the linked fault system responsible for the overall extension of the convergent plate bounclary zone. We have studied deformation and magma emplaceme ...
Field Trip to the Fall Zone, Cape Fear River, Raven Rock State Park
... Appalachian structures, producing a series of wide, deep fault-bounded rift basins from northern Florida to the Grand Banks of Canada (Withjack et al., 1998, 201; Withjack and Schlische, 2005; Faill, 2003; Fig. 5). The remnants of these basins, exposed on the margin today, provide a wealth of geolog ...
... Appalachian structures, producing a series of wide, deep fault-bounded rift basins from northern Florida to the Grand Banks of Canada (Withjack et al., 1998, 201; Withjack and Schlische, 2005; Faill, 2003; Fig. 5). The remnants of these basins, exposed on the margin today, provide a wealth of geolog ...
Shirbatu Granite Dimension Stone in Bamyan Province
... Geology of the Shirbatu Granite Complex Bamyan Granitoid Complex The Shirbatu granite is part of a huge Triassic aged calcalkaline batholith, named as “Bamyan Granitoid Complex” (Figure 3) which extends over thousands of square kilometers from the SW to the NE across Bamyan and Baghlan Provinces. T ...
... Geology of the Shirbatu Granite Complex Bamyan Granitoid Complex The Shirbatu granite is part of a huge Triassic aged calcalkaline batholith, named as “Bamyan Granitoid Complex” (Figure 3) which extends over thousands of square kilometers from the SW to the NE across Bamyan and Baghlan Provinces. T ...
Plate Tectonics -- Structure and Behavior of Oceanic Ridges
... In some cases (Atlantic and Indian) they originally formed under a continent. This rifted the continent and subsequently separated the pieces. In these cases the continental edges on either side appear to fit (the earliest ever observation suggesting drift) and they also fit the ridge! In other case ...
... In some cases (Atlantic and Indian) they originally formed under a continent. This rifted the continent and subsequently separated the pieces. In these cases the continental edges on either side appear to fit (the earliest ever observation suggesting drift) and they also fit the ridge! In other case ...
Information Circular No. 358
... investigated. The two study areas are located, respectively, in the central and northern parts of the Kangding Axis on the western margin of the Yangtze Platform, a region geologically distinguished by late- Archaean to late-Proterozoic basement and by stable sedimentary sequences. The Yangtze Platf ...
... investigated. The two study areas are located, respectively, in the central and northern parts of the Kangding Axis on the western margin of the Yangtze Platform, a region geologically distinguished by late- Archaean to late-Proterozoic basement and by stable sedimentary sequences. The Yangtze Platf ...
Eclogite-facies shear zones-deep crustal reflectors?
... eclogites show omphacite b-axis maxima approximately normal to the foliation and c-axis girdles within the foliation plane. P-wave velocities (V,) determined at confining pressures to 600 MPa for samples from eciogite-facies shear zones range from 8.3 to 8.5 km s-l and anisotropy ranges from 1 to 7% ...
... eclogites show omphacite b-axis maxima approximately normal to the foliation and c-axis girdles within the foliation plane. P-wave velocities (V,) determined at confining pressures to 600 MPa for samples from eciogite-facies shear zones range from 8.3 to 8.5 km s-l and anisotropy ranges from 1 to 7% ...
Argyll and the Islands - Scottish Natural Heritage
... are around 1,800 million years old, much older than the Dalradian rocks, but not as old as the oldest rocks on the British Isles, the Lewisian gneisses of the Outer Hebrides and North-west Highlands. The rocks of the Rhinns are also gneisses; they are coarsely crystalline and have a strongly banded ...
... are around 1,800 million years old, much older than the Dalradian rocks, but not as old as the oldest rocks on the British Isles, the Lewisian gneisses of the Outer Hebrides and North-west Highlands. The rocks of the Rhinns are also gneisses; they are coarsely crystalline and have a strongly banded ...
Seismic re¯ection image revealing offset of Andean subduction
... The data in Fig. 3 are the result of stacking and depth migration of the near-vertical incidence shotgathers in the western half of the ANCORP line. The main features are an eastward-dipping structure from 40 km depth at the coast to 80 km depth at a distance of 120 km inland (the `Nazca re¯ector') ...
... The data in Fig. 3 are the result of stacking and depth migration of the near-vertical incidence shotgathers in the western half of the ANCORP line. The main features are an eastward-dipping structure from 40 km depth at the coast to 80 km depth at a distance of 120 km inland (the `Nazca re¯ector') ...
File
... surface and which is made up of large crystals. magma – Hot molten rock below the Earth’s surface. metamorphic – Rocks formed under extreme pressure and temperature from existing rocks. rock cycle – The cycle linking the processes which form igneous, sedimentary and metamorphic rocks. sedimentar ...
... surface and which is made up of large crystals. magma – Hot molten rock below the Earth’s surface. metamorphic – Rocks formed under extreme pressure and temperature from existing rocks. rock cycle – The cycle linking the processes which form igneous, sedimentary and metamorphic rocks. sedimentar ...
oceanic crust
... collected in the deep ocean basins • As water collected, it dissolved minerals and salts within the rocks forming sea water • After only 20 million years of rain, the oceans were born! ...
... collected in the deep ocean basins • As water collected, it dissolved minerals and salts within the rocks forming sea water • After only 20 million years of rain, the oceans were born! ...
origin of the late paleozoic metamorphic rocks in east
... low grade Barrovian-type metamorphism (Miyashiro, 1994). This type of metamorphism takes place during mountain building events when very thick and large areas of sedimentary rocks are buried, squeezed and heated. Sometimes the metamorphism occurs just because the burial to deep enough, but often it ...
... low grade Barrovian-type metamorphism (Miyashiro, 1994). This type of metamorphism takes place during mountain building events when very thick and large areas of sedimentary rocks are buried, squeezed and heated. Sometimes the metamorphism occurs just because the burial to deep enough, but often it ...
The Sea Floor – Chapter 2
... collected in the deep ocean basins • As water collected, it dissolved minerals and salts within the rocks forming sea water • After only 20 million years of rain, the oceans were born! ...
... collected in the deep ocean basins • As water collected, it dissolved minerals and salts within the rocks forming sea water • After only 20 million years of rain, the oceans were born! ...
Plate tectonics began in Neoproterozoic time
... model and regarded the olivine as residual after partial melting to exhaustion of orthopyroxene.) The fertile lherzolite, pyroxenite, eclogite, and other rocks that now accompany dunite and harzburgite as mantle xenoliths (Griffin et al., 2009) could not have formed in high-temperature equilibrium wi ...
... model and regarded the olivine as residual after partial melting to exhaustion of orthopyroxene.) The fertile lherzolite, pyroxenite, eclogite, and other rocks that now accompany dunite and harzburgite as mantle xenoliths (Griffin et al., 2009) could not have formed in high-temperature equilibrium wi ...
Geological division of the rocks at southeast of
... The rocks of this area are composed mainly of thick massive sandstone, and minor bedded sandstone, alternating beds of sandstone and mudstone, and conglomerate with chert slabs (Fig. 3). The rocks generally strike NE to NW, steeply dip north or south, and are complexly folded in the north of the s ...
... The rocks of this area are composed mainly of thick massive sandstone, and minor bedded sandstone, alternating beds of sandstone and mudstone, and conglomerate with chert slabs (Fig. 3). The rocks generally strike NE to NW, steeply dip north or south, and are complexly folded in the north of the s ...
Rock Identification Lab Information
... 2. Heat from the intrusion of a large igneous mass can metamorphose a large area. 3. Heat from the intrusion of a dike or sill or flow can bake the adjoining rocks in a contact metamorphic zone. Texture - The term texture refers to the size, shape, and boundary relationships of the minerals, particl ...
... 2. Heat from the intrusion of a large igneous mass can metamorphose a large area. 3. Heat from the intrusion of a dike or sill or flow can bake the adjoining rocks in a contact metamorphic zone. Texture - The term texture refers to the size, shape, and boundary relationships of the minerals, particl ...
Seismic reflection profiling in the Proterozoic Arunta Block, central
... 1988.) As part of this interpretation, unconventional methods of data processing and display were used to discriminate between “ thick-skinned” styles of deformation, and and “thin-skinned” have enabled the RDZ to be imaged to depths of at least 35 km. ...
... 1988.) As part of this interpretation, unconventional methods of data processing and display were used to discriminate between “ thick-skinned” styles of deformation, and and “thin-skinned” have enabled the RDZ to be imaged to depths of at least 35 km. ...
No Slide Title
... Kazakhstan, but considered by some to be an extension of the Paleozoic Siberian continent – Laurentia - most of present North America, Greenland, northwestern Ireland, and Scotland – and Siberia - Russia east of the Ural Mountains and Asia north of Kazakhstan and south Mongolia ...
... Kazakhstan, but considered by some to be an extension of the Paleozoic Siberian continent – Laurentia - most of present North America, Greenland, northwestern Ireland, and Scotland – and Siberia - Russia east of the Ural Mountains and Asia north of Kazakhstan and south Mongolia ...
Building Stones 1– a resource for several Earthlearningidea activities
... Crinoidal Limestone (Carboniferous), Derbyshire, England (Portion of a work surface, 2012) In this example of a limestone of Carboniferous age, virtually all the rock is composed of the debris produced by the break up of countless crinoids. These crinoids were animals, related to sea urchins, althou ...
... Crinoidal Limestone (Carboniferous), Derbyshire, England (Portion of a work surface, 2012) In this example of a limestone of Carboniferous age, virtually all the rock is composed of the debris produced by the break up of countless crinoids. These crinoids were animals, related to sea urchins, althou ...
Geology of Paraná - Mineropar
... consequent opening of the Atlantic Ocean 150 million years ago. The continental separation process involved marked uplift of the entire southeastern coast of Brazil, during which large blocks were vertically displaced, some up, some down along geological faults. Serra do Mar corresponds to one of su ...
... consequent opening of the Atlantic Ocean 150 million years ago. The continental separation process involved marked uplift of the entire southeastern coast of Brazil, during which large blocks were vertically displaced, some up, some down along geological faults. Serra do Mar corresponds to one of su ...
Understanding the 3D Structure of the Gilmore Fault Zone Through
... The LO constitutes a majority of the landmass of New South Wales, Victoria and Tasmania and is positioned between the older early Cambrian to early Ordovician Delamerian orogen in the west and the Silurian to Carboniferous NEO to the east. It is further subdivided into three “provinces”: Western, Ce ...
... The LO constitutes a majority of the landmass of New South Wales, Victoria and Tasmania and is positioned between the older early Cambrian to early Ordovician Delamerian orogen in the west and the Silurian to Carboniferous NEO to the east. It is further subdivided into three “provinces”: Western, Ce ...
An Overview of the Structure and Evolution of the Ouachita Orogenic
... This margin and the related inboard features set-up the structural framework of the southern Mid-Continent region. The Late Paleozoic Ouachita/Ancestral Rocky Mountain orogeny reactivated many of the rift-related features and formed new ones. ...
... This margin and the related inboard features set-up the structural framework of the southern Mid-Continent region. The Late Paleozoic Ouachita/Ancestral Rocky Mountain orogeny reactivated many of the rift-related features and formed new ones. ...
Chapter1 General Introduction
... crustal reworking rates which was estimated from the difference of the mean initial Sr isotope compositions of various granites from that of oceanic basalts. ...
... crustal reworking rates which was estimated from the difference of the mean initial Sr isotope compositions of various granites from that of oceanic basalts. ...
Edexcel A2 Geography sample chapter 8
... (D) Describing, defining and discussing the issue . . . . . . . . . . . . . . . . . (R) Researching the issue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (A) Analysing ...
... (D) Describing, defining and discussing the issue . . . . . . . . . . . . . . . . . (R) Researching the issue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (A) Analysing ...
The break-up of continents and the formation of new ocean basins
... weakly magnetic abyssal plain regions. It is here that the process of transition from continental stretching to oceanic sea-®oor spreading is recorded. Such regions have commonly been called `transition zones’, but this term may be misleading, since their structure is not transitional between oceani ...
... weakly magnetic abyssal plain regions. It is here that the process of transition from continental stretching to oceanic sea-®oor spreading is recorded. Such regions have commonly been called `transition zones’, but this term may be misleading, since their structure is not transitional between oceani ...
Rock Cycle
... – minerals with the same negatively charged ion or ion group – belong to the same mineral group ...
... – minerals with the same negatively charged ion or ion group – belong to the same mineral group ...
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.