Chapter 1 Introduction 1.1. Purpose of the investigation
... show intrusions a metasomatic contact metamorphic halo’ surrounding them. Rocks within these contact metamorphic halo’s were described as kinzigites by (Stowe, 1983; Moen, 1988). The intrusions of these granites at 1100 Ma may be regarded as a stitching event after the accretion of the Kakamus and A ...
... show intrusions a metasomatic contact metamorphic halo’ surrounding them. Rocks within these contact metamorphic halo’s were described as kinzigites by (Stowe, 1983; Moen, 1988). The intrusions of these granites at 1100 Ma may be regarded as a stitching event after the accretion of the Kakamus and A ...
Structural development of the Mid-Tertiary Doi Suthep Metamorphic
... schist, suggest peak metamorphic grades in the amphibolite facies. The generally medium- to coarse-grained textures also suggest a high metamorphic grade. This interpretation is consistent with relations farther south, in the Doi Inthanon area. There, metasedimentary rocks form a thick mantle over a ...
... schist, suggest peak metamorphic grades in the amphibolite facies. The generally medium- to coarse-grained textures also suggest a high metamorphic grade. This interpretation is consistent with relations farther south, in the Doi Inthanon area. There, metasedimentary rocks form a thick mantle over a ...
Syngenetic origin for the sediment-hosted disseminated
... geologic characteristics, which suggest that mineralization was associated with intrusive activity that preceded the Miocene initiation of basin and range extension. Neither does the model explain the apparent lack of significant sedimentary rock-hosted gold mineralization in explored geothermal sys ...
... geologic characteristics, which suggest that mineralization was associated with intrusive activity that preceded the Miocene initiation of basin and range extension. Neither does the model explain the apparent lack of significant sedimentary rock-hosted gold mineralization in explored geothermal sys ...
Metamorphism and Metamorphic Rocks
... Platy minerals (mainly micas) predominate Can also contain porphyroblasts ...
... Platy minerals (mainly micas) predominate Can also contain porphyroblasts ...
Click here to the FieldTrip Guide
... Although the age of collision between the FPAB and the older inland domain is still controversial, its largely granitic composition and younger isotope signature have led several authors to admit that it would correspond to a magmatic arc terrane produced by consumption of a former (Adamastor) ocean ...
... Although the age of collision between the FPAB and the older inland domain is still controversial, its largely granitic composition and younger isotope signature have led several authors to admit that it would correspond to a magmatic arc terrane produced by consumption of a former (Adamastor) ocean ...
Document
... sand-rich submarine fan environment, overlying hemipelagic mudstones. The oldest sandstones are rich in juvenile ophiolitic material and record the first clastic input into the Southern Uplands basin. The bulk of the Northern Belt sedimentary sequence, however, is dominated by relatively quartzose s ...
... sand-rich submarine fan environment, overlying hemipelagic mudstones. The oldest sandstones are rich in juvenile ophiolitic material and record the first clastic input into the Southern Uplands basin. The bulk of the Northern Belt sedimentary sequence, however, is dominated by relatively quartzose s ...
The Development of Highly Strained Rocks in the Pelican Window
... extensive uniformity and relatively fine grain size, the intimate association with the pe1itic rocks, the presence of discontinuous calc-silicate layers and pods as well as magnetite, and an apparent crude stratigraphic symmetry of t he units around the Sahli Granite (which is mirrored farther north ...
... extensive uniformity and relatively fine grain size, the intimate association with the pe1itic rocks, the presence of discontinuous calc-silicate layers and pods as well as magnetite, and an apparent crude stratigraphic symmetry of t he units around the Sahli Granite (which is mirrored farther north ...
The Sveconorwegian magmatic and tectono
... The oldest part consists offelsic and mafic layers, tr ansform ed by bedd ing t ransposit ion into parallelism.They are of unknown age and are of intr usive or ext rusive origin, probably serving as th e basement for metasedimentary rocks. The latt er comprise garnet-silliman ite-cordierite- biot it ...
... The oldest part consists offelsic and mafic layers, tr ansform ed by bedd ing t ransposit ion into parallelism.They are of unknown age and are of intr usive or ext rusive origin, probably serving as th e basement for metasedimentary rocks. The latt er comprise garnet-silliman ite-cordierite- biot it ...
Comparison of the Central Metamorphic Belt and Trinity terrane of
... protolith types, metamorphic parageneses, structures, ages of formation and metamorphism, and relations with surrounding units. These terranes consist of ductilely deformed ultramafic to mafic plutonic and volcanic rocks and minor oceanic sedimentary rocks interpreted as oceanic lithosphere. Ultrama ...
... protolith types, metamorphic parageneses, structures, ages of formation and metamorphism, and relations with surrounding units. These terranes consist of ductilely deformed ultramafic to mafic plutonic and volcanic rocks and minor oceanic sedimentary rocks interpreted as oceanic lithosphere. Ultrama ...
Major Gold Deposits and Belts of the North and South American
... belts, occupying fore-arc sites. There is a strong suggestion that the preeminent Cordilleran gold concentrations formed either during or immediately following prolonged contraction. The major gold deposits and belts occur along the craton edge as well as in adjoining accreted terranes, but almost a ...
... belts, occupying fore-arc sites. There is a strong suggestion that the preeminent Cordilleran gold concentrations formed either during or immediately following prolonged contraction. The major gold deposits and belts occur along the craton edge as well as in adjoining accreted terranes, but almost a ...
Chiarenzelli, J., Regan, S., Peck, W., Selleck, B., Cousens, B., Baird, G. and Shrady, C. (2010)
... Copyright not claimed on content prepared wholly by U.S. government employees within scope of their employment. Individual scientists are hereby granted permission, without fees or further requests to GSA, to use a single figure, a single table, and/or a brief paragraph of text in subsequent works a ...
... Copyright not claimed on content prepared wholly by U.S. government employees within scope of their employment. Individual scientists are hereby granted permission, without fees or further requests to GSA, to use a single figure, a single table, and/or a brief paragraph of text in subsequent works a ...
Melt generation in the continental crust: answered and unanswered
... is that: (i) only Ca-poor and strongly peraluminous leucogranites represent pure crustal melts, derived from the only kind of protoliths (aluminous mica schists) which can melt extensively in a chemically-closed crust, and (ii) generation of most other types of silicic igneous rocks requires partici ...
... is that: (i) only Ca-poor and strongly peraluminous leucogranites represent pure crustal melts, derived from the only kind of protoliths (aluminous mica schists) which can melt extensively in a chemically-closed crust, and (ii) generation of most other types of silicic igneous rocks requires partici ...
Chapter 9 - LSU Geology & Geophysics
... • Laurentia grew along its southern margin – by accretion of the Central Plains, Yavapai, and Mazatzal orogens ...
... • Laurentia grew along its southern margin – by accretion of the Central Plains, Yavapai, and Mazatzal orogens ...
Evolution of the Indian Continental Lithosphere: Insights from
... P-4–South Indian High-Grade Domain; P-5–Eastern Ghat High-Grade Domain; P-6– Chotanagpur Gneissic Complex. 4. Purana Basins (1.8–0.5 Ga). 5. Major Precambrian Granitic Bodies. 6. Gondwana Basins (0.29 to 0.12 Ga): DVR–Damodar Valley Rift; GR–Godavari Rift; MR–Mahanadi Rift. 7. Mesozoic Continental B ...
... P-4–South Indian High-Grade Domain; P-5–Eastern Ghat High-Grade Domain; P-6– Chotanagpur Gneissic Complex. 4. Purana Basins (1.8–0.5 Ga). 5. Major Precambrian Granitic Bodies. 6. Gondwana Basins (0.29 to 0.12 Ga): DVR–Damodar Valley Rift; GR–Godavari Rift; MR–Mahanadi Rift. 7. Mesozoic Continental B ...
Precambrian Stratigraphy in the Masi Area, Southwestern Finnmark
... Gårdenvarri formation The rocks of the GåPdenvarri formation were included in the Caskejas Group by Holmsen et al. (1957), but more detailed mapping has clearly shown its position below the Masi Quartzite. It is mainly composed of amphibolites which are interpreted as metabasalts. A faint layering m ...
... Gårdenvarri formation The rocks of the GåPdenvarri formation were included in the Caskejas Group by Holmsen et al. (1957), but more detailed mapping has clearly shown its position below the Masi Quartzite. It is mainly composed of amphibolites which are interpreted as metabasalts. A faint layering m ...
Earth`s first two billion years—The era of internally
... Pearce and Cann (1973). When, as often is the case, the Archean analyses cannot be fitted into desired chemotectonic pigeonholes, hypothetical mixtures and derivatives of criteria are devised to postulate hybrid tectonic settings with no modern analogues. That the discriminants for modern rocks lack ...
... Pearce and Cann (1973). When, as often is the case, the Archean analyses cannot be fitted into desired chemotectonic pigeonholes, hypothetical mixtures and derivatives of criteria are devised to postulate hybrid tectonic settings with no modern analogues. That the discriminants for modern rocks lack ...
Late Proterozoic – Paleozoic Tectonostratigraphic Development and
... nalites with lower 87Sr/86Sr (0.7050.707) and higher δNd (1 to 2) probably represent melts that result from heat required for extensive crustal melting. Metasediments were found in the roof of granites or only as enclaves. A strongly negative δNd 3 to 7 suggests that the detritus of these sedim ...
... nalites with lower 87Sr/86Sr (0.7050.707) and higher δNd (1 to 2) probably represent melts that result from heat required for extensive crustal melting. Metasediments were found in the roof of granites or only as enclaves. A strongly negative δNd 3 to 7 suggests that the detritus of these sedim ...
No. 51. The Sveconorwegian Orogen of southern Scandinavia
... Fennoscandia (the southwestern continental segment of Baltica) and another continent in late Mesoproterozoic time. The orogenic province is composed of five distinct Proterozoic gneiss segments that were displaced and reworked during a succession of compressional (and extensional) orogenic phases at ...
... Fennoscandia (the southwestern continental segment of Baltica) and another continent in late Mesoproterozoic time. The orogenic province is composed of five distinct Proterozoic gneiss segments that were displaced and reworked during a succession of compressional (and extensional) orogenic phases at ...
Did Paleo-Tethyan anoxia kill arc magma fertility for
... Serbia (ca. 84 Ma), the Sar Cheshmeh porphyry Cu-Mo deposit in central Iran (ca. 14 Ma), and the Qulong porphyry Cu-Mo deposit in Tibet (ca. 16 Ma). The oldest known deposits occur in Tibet and the Indosinian porphyry belt of southwestern China, and include Yangla (ca. 233 Ma), Pulang (ca. 213 Ma), ...
... Serbia (ca. 84 Ma), the Sar Cheshmeh porphyry Cu-Mo deposit in central Iran (ca. 14 Ma), and the Qulong porphyry Cu-Mo deposit in Tibet (ca. 16 Ma). The oldest known deposits occur in Tibet and the Indosinian porphyry belt of southwestern China, and include Yangla (ca. 233 Ma), Pulang (ca. 213 Ma), ...
the massabesic gneiss complex, new hampshire
... crust in other locations of the orogen. Two types of amphibolite are present in minor amounts in the paragneiss of the Massabesic Gneiss Complex. The first type is a paramphibolite and consists of calc-silicate layers in the Massabesic paragneiss, the second type is metaigneous. Major and trace elem ...
... crust in other locations of the orogen. Two types of amphibolite are present in minor amounts in the paragneiss of the Massabesic Gneiss Complex. The first type is a paramphibolite and consists of calc-silicate layers in the Massabesic paragneiss, the second type is metaigneous. Major and trace elem ...
chapter 3
... The Coast Range Episode, the second episode in the assembly of the Pacific Northwest, was initiated with the accretion of the Insular Belt megaterrane in mid-Cretaceous time. The accretion of that terrane belt moved the western edge of the continent another several hundred kilometers to the west, est ...
... The Coast Range Episode, the second episode in the assembly of the Pacific Northwest, was initiated with the accretion of the Insular Belt megaterrane in mid-Cretaceous time. The accretion of that terrane belt moved the western edge of the continent another several hundred kilometers to the west, est ...
Secular Variation in the Composition of the Subcontinental
... mantle-derived peridotites, and the major- and traceelement compositions of >8000 mantle-derived Crpyrope garnets, indicates that lithospheric mantle has formed episodically from the Archean to the present. The data document a secular and apparently irreversible change in the chemical composition of ...
... mantle-derived peridotites, and the major- and traceelement compositions of >8000 mantle-derived Crpyrope garnets, indicates that lithospheric mantle has formed episodically from the Archean to the present. The data document a secular and apparently irreversible change in the chemical composition of ...
Proterozoic Rocks, Glacier NP
... • Grenville deformation in Laurentia – was accompanied by the origin – of the Midcontinent rift, • a long narrow continental trough bounded by faults, • extending from the Lake Superior basin southwest ...
... • Grenville deformation in Laurentia – was accompanied by the origin – of the Midcontinent rift, • a long narrow continental trough bounded by faults, • extending from the Lake Superior basin southwest ...
Sample pages 2 PDF
... silicic, rocks. Many ore deposits are indeed hosted by granites, but according to modern ideas of ore genesis, such deposits generally result from the precipitation of ore minerals from aqueous fluids and not from the granitic magma itself. The type of ore mineral in the deposit is directly linked t ...
... silicic, rocks. Many ore deposits are indeed hosted by granites, but according to modern ideas of ore genesis, such deposits generally result from the precipitation of ore minerals from aqueous fluids and not from the granitic magma itself. The type of ore mineral in the deposit is directly linked t ...
Structure of the crust beneath Cameroon, West Africa, from the joint
... continues to the southwest, where it is known as the Foumban Shear Zone, before disappearing beneath the Tertiary to Recent volcanic cover in southwestern Cameroon. The shear zone can also be traced into Brazil, where it is called the Pernambuco lineament (Burke et al. 1971; Browne & Fairhead 1983). ...
... continues to the southwest, where it is known as the Foumban Shear Zone, before disappearing beneath the Tertiary to Recent volcanic cover in southwestern Cameroon. The shear zone can also be traced into Brazil, where it is called the Pernambuco lineament (Burke et al. 1971; Browne & Fairhead 1983). ...
Yilgarn Craton
The Yilgarn Craton is a large craton that constitutes the bulk of the Western Australian land mass. It is bounded by a mixture of sedimentary basins and Proterozoic fold and thrust belts. Zircon grains in the Jack Hills, Narryer Terrane have been dated at ~4.27 Ga, with one detrital zircon dated as old as 4.4 Ga.