Ophiolites PowerPoint PPT Presentations

OPHIOLITES What are ophiolites? Where are they found? How do they compare with oceanic crust? How do the ophiolites of Western Newfoundland compare to oceanic crust?

Layer 2A & B = pillow basalts. Layer 2C = vertical sheeted dikes ... Submarine eruptions and pillows. Sheeted Dyke / Lava Transition ...

Melting increases rapidly above solidus but then settles and increases linearly ... Possible to have aluminous phase near solidus (Plag) ...

... Ophiolite Obduction Oceanic Crust and Upper Mantle Structure Typical Ophiolite Layer 1 A thin layer of pelagic sediment Pillow lavas in the Semail ...

... Movements Fit of Continents Across the Atlantic Present Day Atlantic Atlantic 65 m.y. ago Geology of Plate Margins Ophiolites: ...

... MORB SPREADING RATES OCEANIC CRUST AND UPPER MANTLE STRUCTURE EVIDENCE Seismic Velocities Deep Sea Drilling Program Ophiolites Dredging of Fracture Zone ...

... (ophiolites) are mostly peridotite Mantle rocks must melt to form basaltic magma 3 types of primary basaltic magma At divergent plate margins ...

... settle slow in open ocean water Oceanic crust and ophiolites Hydrothermal activity Chapter 18 The Sea Floor Method of studying the sea floor Depth was ...

Ridges and Transforms The Plate Tectonics Model Sea-Floor Spreading 1. How we know plate tectonics happens Ophiolites: Oceanic Crust Anatomy of a Mid-Ocean Ridge ...

Ni-laterites, Ni in soils in east Albania Simplified tectonic map of central part of Albania (Hoxha, 2001). B: Distribution of ophiolites along of the Balkan ...

Gold mineralization. Host rocks & mechanisms that concentrate gold. History of California Gold Rush & Mining methods. Moon over the northern Sierras ...

Outcrops of the North American continental margin units along the northern half ... Paleogeographic evolution of the continental margins ...

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La reconstitution de l histoire g ologique des alpes : 0 Ev nements g ologiques majeurs Coupes sch matiques Nord 20 A -245 Ma, tous les continents sont r unis ...

THE VOURINOS OPHIOLITE, NORTHWEST MACEDONIA, GREECE. VOURINOS. 2006 ... Associated tectonic melange. Atypical structures! Beautiful metamorphism. No fossils ...

Consequences of magmatic intraplating: Crustal melting and magma contamination in the Norwegian Caledonides Calvin Barnes Aaron Yoshinobu Tore Prestvik

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Marine Reflection Seismology - Geometry The streamer records waves reflected from interfaces

Cratons parts of shield with thin cover of sedimentary rocks ... more inboard position less subsidence. Wading in Iapetus - Stromatolites. Wading in Iapetus ...

Title: Continental growth spurts were all before 1 Ga Subject: eclogite cycle Author: Don Anderson Last modified by: Don Anderson Created Date: 11/23/2006 1:36:59 AM

Himalayan structure and tectonics. India-Asia collision responsible for almost ... high-grade metamorphic and/or plutonic rocks mantled by Tibetan zone sedimentary ...

Laterisation process Upper Cretaceous to Eocene/Miocene. Cretaceous: ophiolite complex , igneous intrusiva. Upper Triassic: dolomitic limestone ...

The term 'Central Asian Orogenic Belt' has geosynclinal connotation. ... that are located between the Siberian craton, Tarim, and North China (Yanshin et ...

... mid- to late Cretaceous age. ... Late Triassic, b) Late Cretaceous, c) Late Eocene (Robertson, ... belongs to the mid-Cretaceous, and formed ~91 my ago. ...

Course 7 Igneous Rocks Igneous Rocks Formed in Rift Igneous Rocks Formed Above Subducting Plate Andesite Granite Peridotite Ternary Diagrams Continental Large ...

The study of the properties of rocks and the processes behind their formation Recognition and description of rocks Interpretation of their origin and history

Title: Magma Subject: basic magma properties Author: Authorized Gateway Customer Last modified by: Michael F. Sheridan Created Date: 2/14/1996 12:46:58 PM

halite / gypsum ratio due to reflux. SEDIMENTARY ROCKS. Chemical Precipitates. Evaporative reflux: constant recharge. constant evaporation. loss of brine ...

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Ocean Crust Marine Geology Thanks to Don Reed San Jose State University

9) Solid Earth. The student knows Earth s interior is differentiated chemically, physically, and thermally. The student is expected to: c. Explain how scientists ...

La convergence lithosphrique et ses effets

Petrology Midterm Review. 2/11/08. What underlies the crust? What we know of the mantle comes from ... Know and understand factors influencing magma viscosity ...

Jaime Toro, Dept. of Geology and Geography, West Virginia University, USA ... Geological map of the Verkhoyansk-Kolyma orogenic region (after Tretiakov, 2004) ...

Geology THIRD EDITION by Stanley Chernicoff University of Washington, Seattle Donna L' Whitney Unive

Title: Powerpoint Presentation Physical Geology, 10/e Author: steve kadel Last modified by: dmillen Created Date: 1/12/2004 8:59:44 PM Document presentation format

Continental Drift and Plate Tectonics. Take-Away Points. How we know plate tectonics happens ... Development of Continental Drift ...

Title: Slide 1 Author: 061279g Last modified by: 061279g Created Date: 11/2/2005 8:26:19 PM Document presentation format: On-screen Show Company: Acadia University

Moreover, a sub-continental magmatism, with WPT affinity, characterizes some ... West of the plateau, continental fragments (i.e., Chortis) and volcanic arc ...

Title: Granites and collisions Author: Information Technology Last modified by: Information Technology Created Date: 4/6/2006 1:53:40 PM Document presentation format

Lithology and thickness of a typical ophiolite sequence, based on the Samial Ophiolite in Oman. After Boudier and Nicolas (1985) Earth Planet. Sci. Lett., 76, 84-92.

Physical Geology, Chapter 18 Tim Horner CSUS Geology Department Features of the Sea Floor Passive continental margins have a continental shelf, continental slope, and ...

Title: Creativity Session Author: Nexhi Bedini Last modified by: chris gerrard Created Date: 6/2/1995 9:07:17 PM Document presentation format: On-screen Show (4:3)

Title: Granites and collisions Author: Information Technology Last modified by: Information Technology Created Date: 4/6/2006 1:53:40 PM Document presentation format

... the oldest known complete ophiolite providing evidence for an ancient convergent plate boundary is the Jormua complex in Finland It is about 1.96 billion ...

... be seen in places escaping' from the rock) leaving a granulite residue ... Alternative Model for Archean Boninites and Related Rocks. Arculus et al. (1992) ...

Calcareous and Ultramafic Rocks Reading: Winter Chapter 29 Calcareous Metamorphic Rocks Calcareous rocks are predominantly carbonates, usually limestone or dolostone ...

Historical Geology Author: Thomson - Brooks/Cole Last modified by: Shaner, Andrew Created Date: 11/28/2002 3:06:17 PM Document presentation format: On-screen Show (4:3)

Crustal thickness is 6 km and varies little with spreading rate. Fast-Spreading Ridges ... 100 km. Structure varies substantially along axis within a segment. ...

Seamounts, Guyots, and. Aseismic Ridges. Reefs - Atolls. Transform Faults - Fracture Zones ... Guyot Formation. Aseismic Ridges - Hotspot Tracks. absolute plate motion ...

Early ideas on 'Continental Drift' ... ( 1910) Frank Taylor suggested that the mid-Atlantic ridge was related to continental drift. ...

(1885) Edward Suess Noted similarities of plant fossils in India, Australia, ... Toit noted that the Permian reptile Mesosaurus (S. America & southern Africa) ...

Named southern super-continent Gondwana in book 'The Face of the Earth' ... Geologists discovered that orientations of iron-bearing minerals is affected by ...

... crust: composed of basalt and gabbro, continuously formed at spreading centers, ... massive gabbros formed in magma chambers. peridotites from the upper mantle ...

EGG: European Groundwater Geochemistry: bottled water Clemens Reimann, Manfred Birke, David Banks, Alecos Demetriades & the EuroGeoSurveys EGG project group

Continental Drift Basic Premise At one point in history all continents were combined in one big supercontinent For some reason the continent split apart and the ...