1 edition of Age relations in high-grade metamorphic terrains. Edited by H.R. Wynne-Edwards found in the catalog.
Age relations in high-grade metamorphic terrains. Edited by H.R. Wynne-Edwards
by Published for Geological Association of Canada by Business and Economic Service in Toronto
Written in English
|LC Classifications||QE 508 A265 1969|
|The Physical Object|
|Pagination||228 p. ill., maps|
|Number of Pages||228|
The sequence of metamorphic facies observed in any metamorphic terrain, depends on the geothermal gradient that was present during metamorphism.&nbrp; A high geothermal gradient such as the one labeled "A" in the figure shown here, might be present around an igneous intrusion, and would result in metamorphic rocks belonging to the hornfels facies. The Lac St-Jean anorthosite massif underlies an area of o km2 and has been emplaced into migmatitic gneisses of the central granulite terrain of the Grenville Province of the Canadian.
The southern margin of the Dharwar craton is bounded by granulite terrains including Niligiri, Salem-Shevaroy, Madras and Kollimalai massifs (Peucat et al., ).These granulite massifs comprise high-grade metamorphic rocks including charnockites, enderbites with interlayered amphibolites, metagabbros, anorthosites, volcanic tuffs and sediments (Peucat et al., ; Mohan et al., a,b Cited by: A rock or a rock complex may bear the effects of more than one metamorphic event (e.g. contact metamorphism following regional metamorphism), and thus the following types of metamorphism can be distinguished. Monometamorphism is a metamorphism resulting from one metamorphic File Size: KB.
Definition of metamorphic grade The intensity or rank of metamorphism, measured by the amount or degree of difference between the original parent rock and the metamorphic rock. It indicates in a general way the pressure-temperature environment or facies in which the metamorphism took place. Spear, F. S. and Peacock, S. M. / METAMORPHIC PRESSURE-TEMPERATURE TIME PATHS, Washington, D. C., , spiral bound, pages, A program manual and computer programs and exercises for the calculation of metamorphic phase equilibria, pressure-temperature-time paths and thermal evolution of orogenic belts, - 3 -, $
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Age relations in high-grade metamorphic terrains. [H R Wynne-Edwards] H.R. Age relations in high-grade metamorphic terrains. Toronto, Business and Economic Service, southwestern Quebec \/ H.R.
Wynne-Edwards -- Relations chronologiques et structurales entre la S\u00E9rie de Grenville et la S\u00E9rie de Morin dans le Sud de Qu. Abstract. Contact metamorphism is due to a temperature rise in rocks adjacent to magmatic intrusions of local extent which penetrate relatively shallow and cold regions of the crust The majority of magmatic intrusions are of granitic : Helmut G.
Winkler. High‐grade metamorphic processes which influence Archaean gold deposits, with particular reference to Big Bell, Australia.
and –° C, based on phase relations, geobaro‐meters and garnet‐biotite Fe‐Mg exchange partitioning. Archaean gold deposits in high‐grade metamorphic terrains have undergone a series of processes Cited by: Wynne-Edwards, H.
() Tectonic overprinting in the Grenville Province, southwestern Quebec, in Age Relations in High-grade Metamorphic Terrains (ed. Wynne-Edwards). Geologic Association of Canada Special Paper 5, pp. – Google Scholar. Tectonic units containing these high grade rocks were emplaced amongst amphibolite facies rocks during an event of widespread shearing which has been dated at ± 4 Ma on the basis of a lower U–Pb zircon intercept age from one of the sheared gneisses and ± 3 Ma U–Pb ages from by: High-grade metamorphic terrains provide important information about the tectonic processes that result in crustal accretion and continental growth (Harley, ).
The pressure–temperature–time evolution (P – T – t) of granulites is usually well constrained, because Cited by: Based on the oldest intrusion age of the granites ( Ga) and the youngest t DM age of the sedimentary rocks ( Ga), the formation age of the supracrustal rocks of the high-grade metamorphic basement should lie between and Ga.
It is very possible that these rocks formed in the early Jinning Period because; (1) there is no evidence to Cited by: Abstract. The anomalous Tertiary(?) Adirondack dome exposes an oblique section across 10–12 km of middle to lower Proterozoic crust (from 17 km depth at ° in the Northwest Lowlands to 25–30 km at –°C in the Central Highlands).Cited by: 8.
A combined petrological and geochronological study of the medium‐to‐high grade metamorphic rocks from the diverse Palaeozoic tectonic units in the Tongbai orogen was undertaken to help elucidate the origins of Triassic ultrahigh‐pressure metamorphism and collision dynamics between the Sino‐Korean and Yangtze cratons.
Peak metamorphic Cited by: Davidson, A.,‘Regional synthesis of the Grenville Province of Ontario and western Quebec. Part I: Some observations on the Grenville Front, and on metamorphism and plutonic rocks in the southwestern Grenville Province’; Can., Geol.
Surv., Paper B, p. – Google ScholarCited by: 7. Intermediate grade metamorphic rocks contain mica as well as minerals such as garnet.
High grade metamorphic rocks form in places that are so hot the rocks almost melt, about degrees Celsius. One mineral that forms in this intense heat is sillimanite, which is often found in the rock gneiss.
Journal of Metamorphic Geology. Volume 6, Issue 1. High‐grade metamorphic processes which influence Archaean gold deposits, with particular reference to Big Bell, Australia. NEIL PHILLIPS. Corresponding Author.
Department of Geology, University of Cited by: Age relations in high-grade metamorphic terrains H. Wynne-Edwards Not In Library. Review of the evidence for the animal nature of Eozöon CanadensePetrology, Accessible book, Paleontology, Structural Geology, Protected DAISY, Metamorphic Rocks, Metamorphism.
The Willyama Complex is a Proterozoic low- intermediate pressure metamorphic terrain (Fig. 1) comprising metasediments and lesser mafic and felsic gneisses (Vernon 1%9).
Two regional deformations have accompanied high grad!e metamorphism, further localized dc!ormations being retrograde in character (Rutland & Etheridge ; Glen et ai. Cited by: A pictorial guide to metamorphic rocks in the field cleavages or foliations.
Figures and show weakly developed cleavages in slate and amphibolite, respectively. The weak nature in the first case is the result of relatively little deformation at low metamorphic grade. In the second case theFile Size: 1MB. The Wanapitei Complex (6 km× km), lying km southeast of the Grenville Front, consists of a northwestern zone of gabbro and folded injection breccia and a southeastern layer of intensely folded hornblendeplagioclase gneiss.
Disseminated Ni-Cu sulphides are unevenly distributed in a zone between the injection breccia and the folded by: 3. This age is significantly older than the 1, and ±20 million year dates previously determined for the igneous rocks of the Llano l isochrons for the individual gneiss Author: Karen E.
Carter. Metamorphic rocks exposed on the surface indicate absence of ﬂuids If excess ﬂuid enriched in water is always available during meta-morphism, a chemical equilibrium must prevail, and hence high-grade metamorphic rocks cannot be present on the surface of the Earth.
Zeolite facies minerals such as clays are the stable assemblages. COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.
As discussed previously, migmatites are small pods and lenses that occur in high grade metamorphic terranes that may represent melts of the surrounding metamorphic rocks. Injection of the these melts into pods and layers in the rock could also produce the discontinuous banding often seen in high grade metamorphic rocks.
Ar/³⁹Ar age spectrum analysis of phengite separates from Naxos, part of the Attic Cycladic Metamorphic Belt in Greece, indicates that cooling following high-pressure, low- to medium-temperature.Wynne-Edwards’ tectonic framework of the Grenville Province (from Wynne-Edwards ).
This was the first tec- tonic subdivision to cover all parts of the Grenville Province.Evolution of metamorphic belts/edited by J. S The Proterozoic Complex of East Antarctica is an extensive metamorphic terrain, which comprises various outcrop areas preserving granulite-facies.