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Science Article PDF - Geological Society of America
Science Article PDF - Geological Society of America

... ophiolite emplacement, and metamorphism were occurring in the Kenyan segment of the East African orogen (Shackleton, 1986; Mosley, 1993). In the northern East African orogen, bimodal rift-related magmatism has been dated at 870 to 840 Ma in the Nubian shield and at 880 Ma in the Arabian shield (revi ...
2.5 MB Notes file that accompanies map ()
2.5 MB Notes file that accompanies map ()

... mingled zone. Farther away from the contacts with the pendant and the mingled zone, the subsolidus overprint in the granitic units of the Yosemite Valley intrusive suite decreases. Local magmatic shear zones occur in the granites and the complex mingled zone. The high temperature solid-state foliati ...
Metamorphic Petrology Review
Metamorphic Petrology Review

... • If water for hydration reactions were available in high-temperature mafic igneous rocks, would coarsegrained or fine-grained rocks react faster? Why? • (T-F) Hydration reactions may release large quantities of energy, significantly heating the rocks. • (T-F) If equilibrium is maintained, there is ...
Oceanic Crust
Oceanic Crust

... Crust beneath the oceans and the continents is different: ...
Deformation of the Continental Crust
Deformation of the Continental Crust

... Stacked Sheets of Continental Crust Due to Convergence of Continental ...
No Slide Title
No Slide Title

... When sediments are buried they retain heat. Some heat comes from buried radioactive grains. Some heat conducted from Earth’s interior. Sediments are also compressed by overlying sediments. Sediments are invaded by groundwater carrying ions. Heat, pressure and ions alter the physical and chemical nat ...
PERSPECTIVES ON METAMORPHIC FLUIDS
PERSPECTIVES ON METAMORPHIC FLUIDS

... depth. Such metamorphic rock units are later returned to the surface by subsequent processes of tectonic exhumation. In many cases burial and exhumation do not occur in the same tectonic episode, sometimes being separated by tens of millions of years (10’s Ma). While multiplicity is suggested for ma ...
Spherulitic Aphyric Pillow-Lobe Metatholeiitic Dacite Lava of the
Spherulitic Aphyric Pillow-Lobe Metatholeiitic Dacite Lava of the

... V10a and b units were apparent, but neither the V10c nor the V10d units were recognized (Jones, 1968, in Ferguson, 1968). It is not possible to ascertain the details of the gold mineralization within the V10 units as there is no longer access to the underground workings, and detailed descriptions do ...
Paleomagnetic reconstruction of Coahuila, Mexico
Paleomagnetic reconstruction of Coahuila, Mexico

... be traced southwards from localities in Texas to the Mexican border. After entering northern Mexico, north of Coahuila island, its position remains a subject of speculation. Most workers extend the Ouachita frontal zone from the Marathon region to central Chihuahua, but beyond it may either curve we ...
When and why the continental crust is subducted: Examples of
When and why the continental crust is subducted: Examples of

... The Indian subcontinent has been colliding against Asia along the Himalayas. Hindu Kush and Burma in this collision zone have intermediate-depth seismicities beneath them, with most of the continental crust subducted into a few hundred km depth. The subduction, not collision, in these regions is an ...
Continental subduction and exhumation of high
Continental subduction and exhumation of high

... normally should also undergo ductile flow. Its diffused deformation however is small because it is blocked by more rigid units. Finally, this crust fails simultaneously with the delamination onset. The later allows the gripped crust to change the form and provides the room for the second crustal sli ...
The story of granite and Bega Cheese
The story of granite and Bega Cheese

... granites of the Bega Batholith. This huge suite of granite is composed of over 130 separate plutons (including the Moruya Granite) covering some 9000 square km of south eastern Australia. Granites of the Bega Batholith, extend from Moruya in the north east to the south at Cape Conran, and Mallacoota ...
Geodynpub_files/Boutelier, 2004
Geodynpub_files/Boutelier, 2004

... normally should also undergo ductile flow. Its diffused deformation however is small because it is blocked by more rigid units. Finally, this crust fails simultaneously with the delamination onset. The later allows the gripped crust to change the form and provides the room for the second crustal sli ...
BH O`Brien - Department of Natural Resources
BH O`Brien - Department of Natural Resources

... of a major northeast-directed overthrust. To the northeast, near the Sops Head Complex melange belt (Unit 5) and the southwest-directed thrust contact with rocks of the Exploits Subzone (Unit 2), the basal thrust at the southeast margin of the Roberts Arm Group is postulated to have been folded from ...
Plate Tectonics PhET
Plate Tectonics PhET

... Now go to the “Plate Motion” tab. Under “View, check “Both,” “Show Labels,” and “Show Sea Water.” Experiment with different types of crust at the plate boundary. Note the following vocabulary terms: ...
June 2006 in Valdez, Alaska
June 2006 in Valdez, Alaska

... Ar/39Ar ages from the Aleutians that show episodic plutonism and volcanism along the entire arc, with peak periods of activity from 38–29, 16–11, and 6–0 Ma. David Farris used structural relationships in the Kodiak portion of the Talkeetna arc to propose that the arc was exhumed following an episode ...
A series of faults are exposed along the west wall of Hooker Valley
A series of faults are exposed along the west wall of Hooker Valley

... Rocks in the Southern Alps have been mapped and classified on the basis of a textural zone classification scheme that is widely applied in New Zealand [Figure 3; Cox and Barrell, 2007; Turnbull et al., 2001]. Textural zone 1 (TZ1) rocks retain their sedimentary (primary) appearance, detrital grain t ...
a geological fieldwork report on the geology of
a geological fieldwork report on the geology of

... This geological report describes an area that is around Matuu town towards the North of Ikaatini and from Katulani towards Mavoloni to the west located in the North of Machakos County in Kenya. It is bounded by Northings 98 72 and 9884 and Easting 3208 and 3469. It lies on the east Africa Mozambique ...
Seismic structure of the crust and uppermost mantle of the Capricorn
Seismic structure of the crust and uppermost mantle of the Capricorn

... Halfway Gneiss, (2) an overlying package of siliciclastic metasedimentary rocks that represent part of the foreland basin to the Ophthalmian Orogeny (Johnson et al., 2010), (3) a belt of 2.00 Ga meta-granitic rocks that are interpreted to have formed in a continental margin arc leading up to the col ...
rholR ~condiuon
rholR ~condiuon

... No one has observed metamorphism taking place, just as no one has ever seen a gnnite pluton form. What, then, leads us to believe that metamorphic rocks form in a solid state (i.e., A metamorphic rock owes its characteristic texture and 1 without melting) at high pressure and temperature? Many ular ...
Ch 21 22 Intro Metam and Classif mod 8
Ch 21 22 Intro Metam and Classif mod 8

... 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, Muscovite, Quartz, plagioclase, garnet, and perhaps Stauroli ...
rocks
rocks

... 2002 Minerals Education Workshop Sponsored by: Indiana Department of Natural Resources – Division of Reclamation November 1-2, 2002 ...
Chapter 04
Chapter 04

... shallow earthquakes) ...
Chortis block: where did it come from - Centro de Geociencias
Chortis block: where did it come from - Centro de Geociencias

... gneissic rock that crops out near the Carao village over the Mosonte River consists of quartz, biotite and muscovite. The rocks are intruded by batholithic bodies of granitic to dioritic composition, and covered nonconformably by coarse continental clastics of Tertiary age known as Totogalpa Format ...
tectonic boundary quiz
tectonic boundary quiz

... Matching: match the plate boundary type to the landform that is created at the boundary. ...
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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.
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