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Saturday, August 1, 2020 | History

2 edition of granulite facies in Sri Lanka (Ceylon) found in the catalog.

granulite facies in Sri Lanka (Ceylon)

D. J. A. C. Hapuarachchi

granulite facies in Sri Lanka (Ceylon)

by D. J. A. C. Hapuarachchi

  • 187 Want to read
  • 17 Currently reading

Published by Geological Survey Dept., Ministry of Industries and Scientific Affairs, Republic of Sri Lanka in Colombo .
Written in English

    Places:
  • Sri Lanka.
    • Subjects:
    • Granulite -- Sri Lanka.,
    • Facies (Geology) -- Sri Lanka.

    • Edition Notes

      Bibliography: p. 28-29.

      Statementby D. J. A. C. Hapuarachchi.
      SeriesProfessional paper - Geological Survey Department ; no. 4
      Classifications
      LC ClassificationsQE475.G7 H36
      The Physical Object
      Paginationiii, 29 p. :
      Number of Pages29
      ID Numbers
      Open LibraryOL4527425M
      LC Control Number76904645

      Sri Lanka consists to a great extent of granulite facies metamorphic rocks originating from the Pan-African orogeny. These rocks are the source of the gem gravels of the island, where a multitude of gemstones, including sillimanite, can be found. We report new petrological and geochronological data of garnet‐cordierite (Grt‐Crd) gneiss as well as two types of leucocratic rocks (garnet‐bearing and cordierite‐bearing leucosomes) crystallized during prograde and near‐peak metamorphisms of the Wanni Complex (WC) in Sri Lanka, and investigate the pressure–temperature–time evolution of granulite‐facies metamorphism for.

      Quarry Location: Andromeda White granite is quarried near NE Colombo, Sri Lanka. Synonyms: Andromeda, Bianco Andromeda, White Andromeda, White Lanka. Granulite: A class of high grade metamorphic rocks of the granulite-facies that have experienced high-temperature and moderate pressure metamorphism. They are medium to coarse-grained and mainly. Arrested prograde charnockite formation in quartzofeldspathic gneisses is widespread in the high-grade terrains of southern India and Sri Lanka. Two major kinds of orthopyroxene-producing reactions are recognized. Breakdown of calcic amphibole by reaction with biotite and quartz in tonalitic/granitic “gray gneiss” produced the regional orthopyroxene isograd, manifest in charnockitic.

      The present position of Sri Lanka and its past fit in Gondwanaland are investigated in relation to the development of the Indian Ocean. The 3 stages in the evolution of the Indian Ocean are shown to be controlled by fundamental NW, NS, and NE Precambrian lineament directions in Sri Lanka . This age seems to agree well with granulite facies metamorphism in southern Sri Lanka during the Pan-African event (Kröner and Williams, ). In conclusion, the “ekanite” yielded a concordant Neoproterozoic age, without having undergone any noticeable continuous or episodic secondary loss of the radiogenic Pb.


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Granulite facies in Sri Lanka (Ceylon) by D. J. A. C. Hapuarachchi Download PDF EPUB FB2

This document has been setup to providing fundamentals of Geology in Sri Lanka. More than 90% of Sri Lanka's surface lies on Precambrian strata, some of it dating back 2 billion years.

Abstract. The island of Sri Lanka is located to the south-east of India and is formed predominantly of Precambrian rocks that occur in several major terrains: the granulite facies Highland Series in the central part of the island, from which several authors separated a South West Group (e.g.

Cooray ; Katz); and the West and East Vijayan, both of which are predominantly composed Cited by: Renate Schumacher, Volker Schenk, Peter Raase, P. Vitanage, Granulite facies metamorphism of metabasic and intermediate rocks in the Highland Series of Sri Lanka, High-temperature Metamorphism and Crustal Anatexis, /, (), ().Cited by: The widely reported Pan-African metamorphic ages derived from similar granulite-facies metamorphic rocks in the Gondwana fragments (Highland Complex in Sri Lanka, Lützow-Holm Complex in east Antarctica, etc.) may also be the result of retrograde metamorphism of ultrahigh-temperature metamorphic by: Journals & Books; Help Download full Vol Issues 1–4, FebruaryPages Petrology of granulite-facies metapelites of the Highland Complex, Sri Lanka: implications for the metamorphic zonation In the Pan-African granulite-facies Highland Complex of Sri Lanka, the metamorphic grade increases from the central Cited by: Two-feldspar geothermometry is applied to granulite-facies metapelites from the Highland Complex of Sri Lanka, for which very high peak temperatures of metamorphism have been inferred.

Two-feldspar thermometry can be applied, even where only one feldspar has preserved its original bulk-composition in terms of Al-Si content, in spite of or. IN SRI LANKA: A POSSIBLE POST METAMORPHIC MID-PALEOZOIC PEGMATITIC-PNEUMATOLITIC ACTIVITY S.W.

NAWARATNE Department of Geology, University of Peradeniya, Peradeniya, Sri Lanka ABSTRACT High grade metamorphic rocks ranging from upper amphibolite facies to granulite facies cover more than 90% of the island of Sri Lanka.

The rest is. A study of the abundance of Be in the gem sediments of Sri Lanka shows that Be is found in the range of 1–13 ppm. Be shows an irregular distribution among sediments. It occurs in the silicate form and due to the proximity to the beryllium bearing rocks, namely granites and pegmatites of the Highland and Southwest Groups of Sri Lanka, very little decomposition of the Be-bearing minerals had.

SRI LANKA Meetiyagod ¥ Galle The oldest unit on the island is the Highland group, which contains rocks of the metamorphic granulite facies, such as hypersthene gneisses (charnoclzites), sillimanite-garnet gneisses (lzhon- dalites), biotite-garnet gneisses.

A strange phenomenon first described from south India and Sri Lanka, where in acid to intermediate rocks granulite-facies assemblages (charnockite) are found in vein-like arrays superimposed over amphibolite-facies gneisses.

These features are now known, on a less conspicuous scale, from a number of other terrains. granulite-facies rocks in continental collision orogens generally have been presumed to be cooled and exhumed slowly from the depths for more than millions of years. Sri Lanka is the key place to unravel the mystery of rapid cooling of huge granulite masses and relevant geological processes because of.

USA (), Kandy, Sri Lanka (), Nice, France (), southern India (), and Singapore (). Southern India and Sri Lanka On scientific and logistical grounds, a most appropriate starting point for a program of deep lithospheric studies of East Gondwanaland is southern India and Sri Lanka.

The Precambrian. Classification of the gem deposits of Sri Lanka. The microthermometry results for the primary inclusions suggested that these corundum formed under granulite facies metamorphism (> ̊C, kbar), while the presence of secondary fluid inclusions indicated retrograde post metamorphic cooling and uplift of the source areas.

Further, the. Highland Group granulite-facies rocks of the Kataragama klippe in southeast Sri Lanka yield a Rb-Sr whole-rock apparent age of 1, {plus minus} Ma, MSWD = 39, and a {sup 87}Sr/{sup 86}Sr intercept of {plus minus}indicating a Highlandian metamorphism about Ga ago.

Highland Group granulite-facies rocks of the Kataragama klippe in southeast Sri Lanka yield a Rb-Sr whole-rock apparent age of, MSWD = 39, and a intercept of, indicating a Highlandian metamorphism about Ga ago.A charnockitic gneiss at Komari near Pottuvil, east Sri Lanka, gives a Rb-Sr whole-rock isochron age of, MSWD =initial, suggesting a metamorphic resetting at about Ga.

complex in Sri Lanka. It is sandwiched by the Wanni Complex in the west andthe Vijayan Complexin the east. Some HighlandCom-plex rocks are found in Buttala, Kataragama, and Kuda Oya within the Vijayan Complex, and are interpreted as tectonic klippen (Fig.

The Highland Complex contains granulite-facies metamor. Geology. More than 90% of Sri Lanka's surface lies on Precambrian strata, some of it dating back 2 billion granulite facies rocks of the Highland Series (gneisses, sillimanite-graphite gneisses, quartzite, marbles, and some charnockites) make up most of the island and the amphibolite facies gneisses, granites, and granitic gneisses of the Vinjayan Series occur in the eastern and.

Excellent outcrops in Matale Sri Lanka provide unique insight into the emplacement and evolution history of hydrothermal and pegmatitic rocks in the central highlands of Sri Lanka.

Field, structural, petrological, thermo-barometric studies in the metamorphic basement rocks in the central highlands and related hydrothermal deposits are presented in this study. Sri Lanka comprises three roughly north-south trending amphibolite- to granulite-facies lithotectonic complexes, from west to east the Highland Complex, the Wanni Complex, and the Vijayan Complex.

Quartz–microperthite–hornblende–garnet–plagioclase granulites belonging to the Highland Series of Ceylon are described. The invariable presence of accessory graphite suggests their metasedimentary origin and their chemical composition indicates a. ABSTRACT. In Februarythe authors explored Sri Lanka’s entire mine-to-market gemstone and jewelry industry.

The team visited numerous mining, cutting, trading, jewelry manufacturing, and retail centers representing each sector and witnessed a dynamic blend of .Garnets from three regional granulite terrains (Sri Lanka, Eastern Ghats, Ivrea Zone) have been analyzed and the results indicate, that garnet can be plastically deformed by dominant dislocation glide/creep with variable dominant slip systems.

Garnets from a granulite facies fold hinge in a quartzite of the Highland Complex of Sri Lanka, unequivocally attest to plastic deformation of garnet.The veins are usually located in the hinge zones of antiforms within granulite facies zones of the Precambrian Basement terrain that underlies much of Sri Lanka.

Common Graphite Uses Graphite is used for its properties of high refractoriness, high electrical and .