Detrital sediments of the ca. 3.77 Ga Nuvvuagittuq Supracrustal Belt
... Boulder, CO 80309, USA (*correspondence: cates@colorado.edu) The Eoarchean Nuvvuagittuq Supracrustal Belt (NSB) in northern Québec is dominated by Ca-poor amphibolites, with minor ultramafic schists, banded iron-formations (BIFs), quartz-biotite schists and other rocks of sedimentary protolith [1]; ...
... Boulder, CO 80309, USA (*correspondence: cates@colorado.edu) The Eoarchean Nuvvuagittuq Supracrustal Belt (NSB) in northern Québec is dominated by Ca-poor amphibolites, with minor ultramafic schists, banded iron-formations (BIFs), quartz-biotite schists and other rocks of sedimentary protolith [1]; ...
Lesson 6 - Earth Formation
... The lithosphere is composed of the crust and the upper part of the mantle. The lithosphere is divided into several layers of slow moving plates. New crustal rock forms at the “diverging” lithospheric plate boundaries. Old crustal rock melts at a subduction zone (...area where one plate plunges ...
... The lithosphere is composed of the crust and the upper part of the mantle. The lithosphere is divided into several layers of slow moving plates. New crustal rock forms at the “diverging” lithospheric plate boundaries. Old crustal rock melts at a subduction zone (...area where one plate plunges ...
Abstract of Referenced Article
... amphibolite-facies conditions (6 kbar and 580–640 °C). Within the Ammonoosuc Volcanics, a finegrained, garnet-, magnetite-, and amphibole-bearing quartzite forms a distinct stratigraphic horizon. The quartzite commonly shows delicate millimeter- to centimeter-thick layering, which is interpreted as ...
... amphibolite-facies conditions (6 kbar and 580–640 °C). Within the Ammonoosuc Volcanics, a finegrained, garnet-, magnetite-, and amphibole-bearing quartzite forms a distinct stratigraphic horizon. The quartzite commonly shows delicate millimeter- to centimeter-thick layering, which is interpreted as ...
presentation source
... India (detached from Gondwana 80Ma ago) and the Eurasian plate. The collision started 50Ma ago between India and Tibet (a microplate), and is still ongoing. During the collision, India was underthrusted beneath Tibet. Devonian sedimentary rocks from the Indian platform were uplifted and now form the ...
... India (detached from Gondwana 80Ma ago) and the Eurasian plate. The collision started 50Ma ago between India and Tibet (a microplate), and is still ongoing. During the collision, India was underthrusted beneath Tibet. Devonian sedimentary rocks from the Indian platform were uplifted and now form the ...
The lithosphere, geodynamics and Archean mineral systems
... 34th International Geological Congress Unearthing our Past and Future — Resourcing Tomorrow ...
... 34th International Geological Congress Unearthing our Past and Future — Resourcing Tomorrow ...
Stratigraphy & geochemistry of the Nipigon basin
... Geochemical evidence for Archean plate tectonics in the 2.7 to 3.0 Ga Uchi Subprovince, northern Ontario Pete Hollings Lakehead University ...
... Geochemical evidence for Archean plate tectonics in the 2.7 to 3.0 Ga Uchi Subprovince, northern Ontario Pete Hollings Lakehead University ...
When did Making Mountains the Modern Way Begin?
... When did Making Mountains the Modern Way Begin? The process of mountain building and major structural change on Earth underwent a significant change in style in the deep geological past. Early Earth was hotter and as a result the planet’s outer lithospheric rock layer was thinner and weaker, consequ ...
... When did Making Mountains the Modern Way Begin? The process of mountain building and major structural change on Earth underwent a significant change in style in the deep geological past. Early Earth was hotter and as a result the planet’s outer lithospheric rock layer was thinner and weaker, consequ ...
Notes on Metamorphic Rocks and Deformation of Crust Mountains
... -Same force uplifts ______________- large flat-topped rocks high above sea level that have been slowly uplifted usually found next to mountain ranges (ex: Colorado plateau and Tibetan plateau) ...
... -Same force uplifts ______________- large flat-topped rocks high above sea level that have been slowly uplifted usually found next to mountain ranges (ex: Colorado plateau and Tibetan plateau) ...
New information about how Himalayas were formed
... rocks like those we examined got to such depths and came back up to the surface." ...
... rocks like those we examined got to such depths and came back up to the surface." ...
Archean Plate Tectonics: Isotopic Evidence from Samples of the
... Mixing of subduction fluids with peridotite in the mantle wedge (Westerlund, Shirey, Richardson, Carlson, Harris, Gurney, CMP in press) ...
... Mixing of subduction fluids with peridotite in the mantle wedge (Westerlund, Shirey, Richardson, Carlson, Harris, Gurney, CMP in press) ...
Archean
... • Its topography is subdued, – with numerous lakes and exposed Archean – and Proterozoic rocks thinly covered – in places by Pleistocene glacial deposits ...
... • Its topography is subdued, – with numerous lakes and exposed Archean – and Proterozoic rocks thinly covered – in places by Pleistocene glacial deposits ...
Paper Number: 2077 - American Geosciences Institute
... The Ophiolite Belt in Manipur and Nagaland states of the Indo-Myanmar Ranges (IMR) of North-east India consists predominantly of tectonic slices representing various units of ancient ocean-floor rocks that include the ultramafic body (main ophiolite suite), mafic dykes and sills, pillow lavas, kindr ...
... The Ophiolite Belt in Manipur and Nagaland states of the Indo-Myanmar Ranges (IMR) of North-east India consists predominantly of tectonic slices representing various units of ancient ocean-floor rocks that include the ultramafic body (main ophiolite suite), mafic dykes and sills, pillow lavas, kindr ...
The Precambrian rift-related metamagmatic rocks of the Southern
... We have studied mainly mafic-ultramafic sequence and partly their wall-rocks. REE abundances of these rocks are listed in Table 1. The strongly altered mafic-ultramafic rocks on the REE patterns normalized to average ordinary chondrite exhibit well-pronounced negative Eu anomaly and other characteri ...
... We have studied mainly mafic-ultramafic sequence and partly their wall-rocks. REE abundances of these rocks are listed in Table 1. The strongly altered mafic-ultramafic rocks on the REE patterns normalized to average ordinary chondrite exhibit well-pronounced negative Eu anomaly and other characteri ...
The Late Oligocene-Early Miocene Petrified Forest in Evros and its
... Rhodope massif and Circum Rhodope Belt. New K/Ar ages of volcanic rocks in this area range from 33.5 to 19.6 Ma, establishing an Oligocene and a Lower Miocene period of magmatic activity. The lower series starts with a basal-clastic formation, composed of conglomerates and sandstones which continues ...
... Rhodope massif and Circum Rhodope Belt. New K/Ar ages of volcanic rocks in this area range from 33.5 to 19.6 Ma, establishing an Oligocene and a Lower Miocene period of magmatic activity. The lower series starts with a basal-clastic formation, composed of conglomerates and sandstones which continues ...
Lecture Slides
... 2. Initial Pb must be known/modeled or you must chose minerals that have essentially no initial Pb (zircon, apatite, monazite). 3. 235U/238U known today (1/137.88) and invariant across most of planet. 4. Still a problem, the equation: ...
... 2. Initial Pb must be known/modeled or you must chose minerals that have essentially no initial Pb (zircon, apatite, monazite). 3. 235U/238U known today (1/137.88) and invariant across most of planet. 4. Still a problem, the equation: ...
Palaeoproterozoic Crustal Evolution of the Southern Eyre Peninsula
... continental crust. Regardless of the specific mechanisms that may have operated, the net flux of material preserved in the continental crust of southern Eyre Peninsula suggests a protracted history over which relatively large volumes of crust are grown in short periods of time, against a constant ba ...
... continental crust. Regardless of the specific mechanisms that may have operated, the net flux of material preserved in the continental crust of southern Eyre Peninsula suggests a protracted history over which relatively large volumes of crust are grown in short periods of time, against a constant ba ...
Proterozoic Rocks
... • Large Eu anomaly indicates magmatic • Anorthosites are cumulates with plagioclase magacrysts • Are the felsic charnokites co-magmatic? – Different Sr ratios from anorthosites ...
... • Large Eu anomaly indicates magmatic • Anorthosites are cumulates with plagioclase magacrysts • Are the felsic charnokites co-magmatic? – Different Sr ratios from anorthosites ...
Adakites and the Origin of Cu, Au and Mineralisation
... Several recent studies have suggested that deposits of Cu, Au and related metals are linked with formation of adakitic rocks (Thieblemont et al., 1997; Mungall, 2002; Dreher et al., 2005). Adakites are rocks formed from intermediate to evolved subduction zone magma bearing a signature of equilibrati ...
... Several recent studies have suggested that deposits of Cu, Au and related metals are linked with formation of adakitic rocks (Thieblemont et al., 1997; Mungall, 2002; Dreher et al., 2005). Adakites are rocks formed from intermediate to evolved subduction zone magma bearing a signature of equilibrati ...
2200 million years of crustal evolution: the baltic shield
... granitoids, 14. Rapakivi granites, 15. Värmland-Småland porphyry granite, 16. Jotnian and Sub-Jotnian rocks, 17. Sveconorwegian gneisses, 18. Telemark suite, Dal group, Kapebo group, 19. Late Proterozoic granites, 20. Caledonides, 21. Sedimentary cover of the East European platform, 22. Oslo graben, ...
... granitoids, 14. Rapakivi granites, 15. Värmland-Småland porphyry granite, 16. Jotnian and Sub-Jotnian rocks, 17. Sveconorwegian gneisses, 18. Telemark suite, Dal group, Kapebo group, 19. Late Proterozoic granites, 20. Caledonides, 21. Sedimentary cover of the East European platform, 22. Oslo graben, ...
The Archean Eon
... • Bacteria form mat-like colonies. • Sediment particles settle on the mat. • Bacterial grow upward, trapping sediment. • Process repeats, forming stacked laminae of mud. • Stacks take on a variety of shapes and sizes. • Laminated sediment is preserved in rock. • Problem: similar structures can be pr ...
... • Bacteria form mat-like colonies. • Sediment particles settle on the mat. • Bacterial grow upward, trapping sediment. • Process repeats, forming stacked laminae of mud. • Stacks take on a variety of shapes and sizes. • Laminated sediment is preserved in rock. • Problem: similar structures can be pr ...
Metamorphic rocks|A1 Sample answer
... Metamorphic rocks| A1 Sample answer Explain the formation of metamorphic rocks with reference to examples from Ireland. (2013 Q1B) Metamorphic rocks are formed when the appearance, texture and chemical composition of igneous or sedimentary rocks are changed by great heat, pressure or a combination o ...
... Metamorphic rocks| A1 Sample answer Explain the formation of metamorphic rocks with reference to examples from Ireland. (2013 Q1B) Metamorphic rocks are formed when the appearance, texture and chemical composition of igneous or sedimentary rocks are changed by great heat, pressure or a combination o ...
Chapter 10 ROCKS
... • Form from cemented together rock fragments, organic material, or from minerals that precipitate out of water. • May have layered structure from deposition of various kinds of sediment ...
... • Form from cemented together rock fragments, organic material, or from minerals that precipitate out of water. • May have layered structure from deposition of various kinds of sediment ...
Chapter 2. Composition of the continental crust
... (1) estimate the composition of LCC and calculate the bulk composition of CC. (= Approch of Rudnick et Fountain) (2) choose a crustal growth model and identify its products. (= Approch of Taylor et McLennan, 1985, Chap. 3, 57-72). a) lateral accretion of island arcs b) crustal "underplating" (tonali ...
... (1) estimate the composition of LCC and calculate the bulk composition of CC. (= Approch of Rudnick et Fountain) (2) choose a crustal growth model and identify its products. (= Approch of Taylor et McLennan, 1985, Chap. 3, 57-72). a) lateral accretion of island arcs b) crustal "underplating" (tonali ...
Baltic Shield
The Baltic Shield (sometimes referred to as the Fennoscandian Shield) is located in Fennoscandia (Norway, Sweden and Finland), northwest Russia and under the Baltic Sea. The Baltic Shield is defined as the exposed Precambrian northwest segment of the East European Craton. It is composed mostly of Archean and Proterozoic gneisses and greenstones which have undergone numerous deformations through tectonic activity (see Geology of Fennoscandia map [1]). The Baltic Shield contains the oldest rocks of the European continent. The lithospheric thickness is about 200-300 km. During the Pleistocene epoch, great continental ice sheets scoured and depressed the shield's surface, leaving a thin covering of glacial material and innumerable lakes and streams. The Baltic Shield is still rebounding today following the melting of the thick glaciers during the Quaternary Period.