Geological fieldwork in the southwestern and central parts of the highland complex, Sri Lanka, during 1998-1999, with special reference to the highest grade metamorphic rocks

Y. Osanai, A. K. Tsutomu, Y. Miyashita, I. Kusachi, T. Yamasaki, D. Doyama, W. K.B.N. Prame, S. Jayatileke, V. Mathavan

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

The field survey of high- and ultrahigh-temperature metamorphic rocks in the southwestern and central parts of Sri Lanka was successfully carried out from December, 1998 to January, 1999. The area of the present study covers the southwestern and central parts of the Highland Complex and certain parts of the Wanni Complex. Systematic sampling was carried out (about 2.5 tons in total) along with field mapping and structural studies. This contribution briefly describes the field occurrences of ten types of metamorphic rocks and two types of charnockite and records the preliminary petrological results of the ultrahigh-temperature (UHT) metamorphic rocks (sapphirine granulites and mafic to ultramafic granulites) in the Highland Complex, Sri Lanka Sapphirine granulites were equilibrated at 900-1000 MPa and 900-1050°C at the peak metamorphic stage and then reached kornerupine-forming conditions at 750 MPa and 800°C through c. 950 MPa and c. 850°C during retrogression. The high-pressure assemblages in mafic and ultramafic granulites (clinopyroxene-garnet-plagioclase, olivine-garnet-clinopyroxene) also show evidence of 1000-1500 MPa at early stage of their metamorphic evolution.

Original languageEnglish
Pages (from-to)227-247
Number of pages21
JournalJournal of Geosciences
Issue number43
Publication statusPublished - Jan 1 2000
Externally publishedYes

Fingerprint

metamorphic rock
fieldwork
sapphirine
clinopyroxene
garnet
kornerupine
charnockite
retrogression
field survey
plagioclase
olivine
temperature
sampling

All Science Journal Classification (ASJC) codes

  • Geology

Cite this

Geological fieldwork in the southwestern and central parts of the highland complex, Sri Lanka, during 1998-1999, with special reference to the highest grade metamorphic rocks. / Osanai, Y.; Tsutomu, A. K.; Miyashita, Y.; Kusachi, I.; Yamasaki, T.; Doyama, D.; Prame, W. K.B.N.; Jayatileke, S.; Mathavan, V.

In: Journal of Geosciences, No. 43, 01.01.2000, p. 227-247.

Research output: Contribution to journalArticle

Osanai, Y, Tsutomu, AK, Miyashita, Y, Kusachi, I, Yamasaki, T, Doyama, D, Prame, WKBN, Jayatileke, S & Mathavan, V 2000, 'Geological fieldwork in the southwestern and central parts of the highland complex, Sri Lanka, during 1998-1999, with special reference to the highest grade metamorphic rocks', Journal of Geosciences, no. 43, pp. 227-247.
Osanai, Y. ; Tsutomu, A. K. ; Miyashita, Y. ; Kusachi, I. ; Yamasaki, T. ; Doyama, D. ; Prame, W. K.B.N. ; Jayatileke, S. ; Mathavan, V. / Geological fieldwork in the southwestern and central parts of the highland complex, Sri Lanka, during 1998-1999, with special reference to the highest grade metamorphic rocks. In: Journal of Geosciences. 2000 ; No. 43. pp. 227-247.
@article{8a0a3f2c3af14e83a49afc0346eeb11e,
title = "Geological fieldwork in the southwestern and central parts of the highland complex, Sri Lanka, during 1998-1999, with special reference to the highest grade metamorphic rocks",
abstract = "The field survey of high- and ultrahigh-temperature metamorphic rocks in the southwestern and central parts of Sri Lanka was successfully carried out from December, 1998 to January, 1999. The area of the present study covers the southwestern and central parts of the Highland Complex and certain parts of the Wanni Complex. Systematic sampling was carried out (about 2.5 tons in total) along with field mapping and structural studies. This contribution briefly describes the field occurrences of ten types of metamorphic rocks and two types of charnockite and records the preliminary petrological results of the ultrahigh-temperature (UHT) metamorphic rocks (sapphirine granulites and mafic to ultramafic granulites) in the Highland Complex, Sri Lanka Sapphirine granulites were equilibrated at 900-1000 MPa and 900-1050°C at the peak metamorphic stage and then reached kornerupine-forming conditions at 750 MPa and 800°C through c. 950 MPa and c. 850°C during retrogression. The high-pressure assemblages in mafic and ultramafic granulites (clinopyroxene-garnet-plagioclase, olivine-garnet-clinopyroxene) also show evidence of 1000-1500 MPa at early stage of their metamorphic evolution.",
author = "Y. Osanai and Tsutomu, {A. K.} and Y. Miyashita and I. Kusachi and T. Yamasaki and D. Doyama and Prame, {W. K.B.N.} and S. Jayatileke and V. Mathavan",
year = "2000",
month = "1",
day = "1",
language = "English",
pages = "227--247",
journal = "Journal of Geosciences",
issn = "0449-2560",
publisher = "Osaka City University",
number = "43",

}

TY - JOUR

T1 - Geological fieldwork in the southwestern and central parts of the highland complex, Sri Lanka, during 1998-1999, with special reference to the highest grade metamorphic rocks

AU - Osanai, Y.

AU - Tsutomu, A. K.

AU - Miyashita, Y.

AU - Kusachi, I.

AU - Yamasaki, T.

AU - Doyama, D.

AU - Prame, W. K.B.N.

AU - Jayatileke, S.

AU - Mathavan, V.

PY - 2000/1/1

Y1 - 2000/1/1

N2 - The field survey of high- and ultrahigh-temperature metamorphic rocks in the southwestern and central parts of Sri Lanka was successfully carried out from December, 1998 to January, 1999. The area of the present study covers the southwestern and central parts of the Highland Complex and certain parts of the Wanni Complex. Systematic sampling was carried out (about 2.5 tons in total) along with field mapping and structural studies. This contribution briefly describes the field occurrences of ten types of metamorphic rocks and two types of charnockite and records the preliminary petrological results of the ultrahigh-temperature (UHT) metamorphic rocks (sapphirine granulites and mafic to ultramafic granulites) in the Highland Complex, Sri Lanka Sapphirine granulites were equilibrated at 900-1000 MPa and 900-1050°C at the peak metamorphic stage and then reached kornerupine-forming conditions at 750 MPa and 800°C through c. 950 MPa and c. 850°C during retrogression. The high-pressure assemblages in mafic and ultramafic granulites (clinopyroxene-garnet-plagioclase, olivine-garnet-clinopyroxene) also show evidence of 1000-1500 MPa at early stage of their metamorphic evolution.

AB - The field survey of high- and ultrahigh-temperature metamorphic rocks in the southwestern and central parts of Sri Lanka was successfully carried out from December, 1998 to January, 1999. The area of the present study covers the southwestern and central parts of the Highland Complex and certain parts of the Wanni Complex. Systematic sampling was carried out (about 2.5 tons in total) along with field mapping and structural studies. This contribution briefly describes the field occurrences of ten types of metamorphic rocks and two types of charnockite and records the preliminary petrological results of the ultrahigh-temperature (UHT) metamorphic rocks (sapphirine granulites and mafic to ultramafic granulites) in the Highland Complex, Sri Lanka Sapphirine granulites were equilibrated at 900-1000 MPa and 900-1050°C at the peak metamorphic stage and then reached kornerupine-forming conditions at 750 MPa and 800°C through c. 950 MPa and c. 850°C during retrogression. The high-pressure assemblages in mafic and ultramafic granulites (clinopyroxene-garnet-plagioclase, olivine-garnet-clinopyroxene) also show evidence of 1000-1500 MPa at early stage of their metamorphic evolution.

UR - http://www.scopus.com/inward/record.url?scp=0033797549&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0033797549&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0033797549

SP - 227

EP - 247

JO - Journal of Geosciences

JF - Journal of Geosciences

SN - 0449-2560

IS - 43

ER -