Metamorphic Rocks
... Metamorphic grade in foliated rocks For same parent rock (i.e., shale), transitions from slate to gneiss indicate increasing depth of burial inside a mountain belt along a convergent plate boundary ...
... Metamorphic grade in foliated rocks For same parent rock (i.e., shale), transitions from slate to gneiss indicate increasing depth of burial inside a mountain belt along a convergent plate boundary ...
Inter-relationship between tectonic, magmatic and sedimentary
... subsidence and thermal history of hyperextended domains. In my presentation I will therefore review key observations made along the Iberia-Newfoundland, Bay of Biscay-Pyrenean and Alpine Tethys rift systems and will try to show how they may impact our thinking and understanding of hyperextended syst ...
... subsidence and thermal history of hyperextended domains. In my presentation I will therefore review key observations made along the Iberia-Newfoundland, Bay of Biscay-Pyrenean and Alpine Tethys rift systems and will try to show how they may impact our thinking and understanding of hyperextended syst ...
Sedimentary rocks are composed of
... The sedimentary blanket Spatial distribution of rock types: • The lithosphere (upper 16 km of crust) is ~90-95% igneous and metamorphic rocks by volume. • However, ~90% of the Earth’s surface is mantled in sediments or sedimentary rocks with an average thickness of 800-4000 m. ...
... The sedimentary blanket Spatial distribution of rock types: • The lithosphere (upper 16 km of crust) is ~90-95% igneous and metamorphic rocks by volume. • However, ~90% of the Earth’s surface is mantled in sediments or sedimentary rocks with an average thickness of 800-4000 m. ...
Qal Alluvium - Deposits of sand and gravel with lesser...
... Interlayered mafic and felsic gneiss - Northern unit. White to very light gray, medium to finely crystalline felsic gneiss with serate texture. Felsic gneiss composed of feldspar, quartz, and muscovite. Mafic gneiss is dark greenish-gray to greenish-blaccomposed of hornblende and feldspar. Correlati ...
... Interlayered mafic and felsic gneiss - Northern unit. White to very light gray, medium to finely crystalline felsic gneiss with serate texture. Felsic gneiss composed of feldspar, quartz, and muscovite. Mafic gneiss is dark greenish-gray to greenish-blaccomposed of hornblende and feldspar. Correlati ...
GS-14
... The Assean Lake and Aiken River deformation zones separate the Split Lake Block (SLB) from the Assean Lake Crustal Complex (ALCC) to the north and the Pikwitonei Granulite Domain (PGD) to the south, respectively (Fig. GS-14-1a). Three weeks of mapping were conducted in the Assean Lake area (Fig. GS- ...
... The Assean Lake and Aiken River deformation zones separate the Split Lake Block (SLB) from the Assean Lake Crustal Complex (ALCC) to the north and the Pikwitonei Granulite Domain (PGD) to the south, respectively (Fig. GS-14-1a). Three weeks of mapping were conducted in the Assean Lake area (Fig. GS- ...
Precambrian Crystalline Basement rocks of Eritrea
... contact and is marked by a shear zone and interpreted in TM data (Fig:5) to be a thrust zone along which reveals the crust consisting the low-grade rocks subducted to the west below. ...
... contact and is marked by a shear zone and interpreted in TM data (Fig:5) to be a thrust zone along which reveals the crust consisting the low-grade rocks subducted to the west below. ...
Project 6: Reindeer Lake North (SE Quarter) Area Reconnaissance
... trending N-S across the area may be related to the small-scale P2 folds . Metamorphism and intrusion appear to have begun early in the isoclinal folding phase and continued throughout the kink folding phase; although metamorphism appears to have outlasted intrusion. Due to the local variation of mos ...
... trending N-S across the area may be related to the small-scale P2 folds . Metamorphism and intrusion appear to have begun early in the isoclinal folding phase and continued throughout the kink folding phase; although metamorphism appears to have outlasted intrusion. Due to the local variation of mos ...
Minerals and Rocks Outline •Matter, Atoms, etc. •Minerals •Igneous
... – indicators of how Earth developed over geological time – mixture of one or more minerals Mineral – naturally occurring – inorganic crystalline solid – made of chemically bonded elements – with definite chemical composition Crystals Solid composed of atoms and molecules Have ordered internal struct ...
... – indicators of how Earth developed over geological time – mixture of one or more minerals Mineral – naturally occurring – inorganic crystalline solid – made of chemically bonded elements – with definite chemical composition Crystals Solid composed of atoms and molecules Have ordered internal struct ...
V- Diamond Deposits in Kimberlites and Lamproites
... Depth of generation: 100 – 300 km. Require areas of thick continental crust, and a source of C. Some C recycled by subduction of crustal material as indicated by 13C measurements; note different signatures for eclogitic vs. peridotitic diamonds. Some diamonds in alkali basalts, ophiolites a ...
... Depth of generation: 100 – 300 km. Require areas of thick continental crust, and a source of C. Some C recycled by subduction of crustal material as indicated by 13C measurements; note different signatures for eclogitic vs. peridotitic diamonds. Some diamonds in alkali basalts, ophiolites a ...
252Lab DJP_13 Geology of S. Island PDF only
... In synthesis: The basement terranes of New Zealand are interpreted in terms of progressive Pacific-ward growth of the Gondwana-Pangea supercontinent by Terrane accretion and batholith intrusion at an obliquely convergent margin. The Early Paleozoic Buller and Takaka Terranes were accreted to Gondwan ...
... In synthesis: The basement terranes of New Zealand are interpreted in terms of progressive Pacific-ward growth of the Gondwana-Pangea supercontinent by Terrane accretion and batholith intrusion at an obliquely convergent margin. The Early Paleozoic Buller and Takaka Terranes were accreted to Gondwan ...
At a destructive plate boundary
... between continental and oceanic crusts, i.e. not on the processes at a destructive plate boundary. Student task 1B is a differentiated version to aid less able students with an accompanying word bank. The differentiated version also requires less depth of knowledge for the answer as the question is ...
... between continental and oceanic crusts, i.e. not on the processes at a destructive plate boundary. Student task 1B is a differentiated version to aid less able students with an accompanying word bank. The differentiated version also requires less depth of knowledge for the answer as the question is ...
Geochemical relationships between volcanic and plutonic upper to
... Previously interpreted as rifting (Busby et al., 2006) Previously interpreted as onset of rifting (Busby et al., 2006) ...
... Previously interpreted as rifting (Busby et al., 2006) Previously interpreted as onset of rifting (Busby et al., 2006) ...
Wegener - Course World
... The idea of sea-floor spreading also predicts that the rocks nearest the ridge are younger than the rocks further away, and this is just what scientists found. On either side of oceanic ridges, the age of rocks increased with increasing distance from the ridge. By the end of the 1960s, the theory of ...
... The idea of sea-floor spreading also predicts that the rocks nearest the ridge are younger than the rocks further away, and this is just what scientists found. On either side of oceanic ridges, the age of rocks increased with increasing distance from the ridge. By the end of the 1960s, the theory of ...
Igneous Rocks
... Igneous Rocks Magma forms when rock in the Earth partially melts. This can occur during the following conditions: a. Pressure decreases b. Volatiles are added c. ...
... Igneous Rocks Magma forms when rock in the Earth partially melts. This can occur during the following conditions: a. Pressure decreases b. Volatiles are added c. ...
Plate Boundaries…
... As the crust widens and thins, valleys form in and around the area Volcanoes too (may become increasingly active) Early in rift formation, streams and rivers flow into the low valleys and long, narrow lakes can be created. Eventually, the widening crust along the boundary may become thin enough that ...
... As the crust widens and thins, valleys form in and around the area Volcanoes too (may become increasingly active) Early in rift formation, streams and rivers flow into the low valleys and long, narrow lakes can be created. Eventually, the widening crust along the boundary may become thin enough that ...
How Rocks are Formed
... remains a mould. Usually, however, more mineral matter is moved in by water and fills the mould to form a cast. ...
... remains a mould. Usually, however, more mineral matter is moved in by water and fills the mould to form a cast. ...
Ophiolite Trail: Introduction
... In Shetland, though, this did not happen. Layered ocean crust forms within a magma Instead a thick slab of ocean crust and chamber at a mid-ocean ridge and spreads mantle was thrust up over the continent Mid-ocean ridge and ‘emplaced’ upon it. The crust bent ...
... In Shetland, though, this did not happen. Layered ocean crust forms within a magma Instead a thick slab of ocean crust and chamber at a mid-ocean ridge and spreads mantle was thrust up over the continent Mid-ocean ridge and ‘emplaced’ upon it. The crust bent ...
Strike-slip tectonics in arc-continent collision
... The overprinting features between some of the previous structures related to the fracture network and the D1 structures, show that the more brittle ones are related to a younger major tectonic event which is considered has D2 (Ferreira, 2011; Oliveira, 2011). The D2 widespread structures found in Cr ...
... The overprinting features between some of the previous structures related to the fracture network and the D1 structures, show that the more brittle ones are related to a younger major tectonic event which is considered has D2 (Ferreira, 2011; Oliveira, 2011). The D2 widespread structures found in Cr ...
Tectonic Plates - cloudfront.net
... of icebergs—there is much more material below the surface than above. Mountain ranges that occur in continental crust have very deep roots relative to their height. For example, the Rocky Mountains rise less than 5 km above sea level, but their roots go down to about 60 km below sea level. But if co ...
... of icebergs—there is much more material below the surface than above. Mountain ranges that occur in continental crust have very deep roots relative to their height. For example, the Rocky Mountains rise less than 5 km above sea level, but their roots go down to about 60 km below sea level. But if co ...
May - Broome County
... seashells in bluish colored rocks. What do the different types of fossils and rocks in this area tell us about our geologic history? Plate tectonic theory tells us that Eastern North America collided with parts of Europe and Africa several times in the distant past. These collisions and resultant mo ...
... seashells in bluish colored rocks. What do the different types of fossils and rocks in this area tell us about our geologic history? Plate tectonic theory tells us that Eastern North America collided with parts of Europe and Africa several times in the distant past. These collisions and resultant mo ...
Rocks
... Organic – forms from accumulation of dead plants and animals. Chemical – form when dissolved minerals precipitate out or are left behind when a solution evaporates. ...
... Organic – forms from accumulation of dead plants and animals. Chemical – form when dissolved minerals precipitate out or are left behind when a solution evaporates. ...
READ MORE - Multotec
... and Au by fluvial processes. same geological setting and genesis as before with Ni, Cu and Au concentrated in certain layers. shallow stratiform seams. overburden usually mid-to-late phanerozoic sediments. chromitite in two deposit types. stratiform: ultrabasic layered igneous complexes. podiform: d ...
... and Au by fluvial processes. same geological setting and genesis as before with Ni, Cu and Au concentrated in certain layers. shallow stratiform seams. overburden usually mid-to-late phanerozoic sediments. chromitite in two deposit types. stratiform: ultrabasic layered igneous complexes. podiform: d ...
Syseca normal blank template - Manchester Geological Association
... changes that have affected southern Britain, with particular emphasis on the Lower Palaeozoic Welsh Basin. Together, these track the evolution of the continental margin of West Gondwana, which culminated with the Caledonian Orogeny and its assembly with the palaeocontinent of Laurentia. This overvie ...
... changes that have affected southern Britain, with particular emphasis on the Lower Palaeozoic Welsh Basin. Together, these track the evolution of the continental margin of West Gondwana, which culminated with the Caledonian Orogeny and its assembly with the palaeocontinent of Laurentia. This overvie ...
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.