The peristerite gap in low-grade metamorphic rocks

S. Maruyama, J. G. Liou, K. Suzuki

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

Coexisting Na-plagioclases from greenschists both in the thermal aureole of the Kasugamura Granite, Japan, and in the low-P metamorphic zone of Yap Island, western Pacific were analyzed in great detail; the peristerite solvus was determined for each suite. The asymmetric solvus has steep albite-rich and gentle oligoclase-rich limbs that are similar to those for higher pressure series. The present results together with those from Vermont, New Zealand, and the Sanbagawa belt indicate that the peristerite solvus shifts toward the albite component and higher temperature with increasing pressure. With increasing pressure, albite co-existing with oligoclase (An=100 Ca/Ca+ Na=20) varies in composition from An 8-9 (in Kasugamura), through An 3 (in Yap Island and Vermont), to An 1 (in New Zealand) and An less than 0.5 (in the Sanbagawa belt). The consolute temperatures for the peristerite solvus estimated from available geothermometry are 420° C in Kasugamura, 450-550° C in Vermont and 550°-600° C in the Sanbagawa belt. The variation of plagioclase composition in progressive metamorphic zones is explained by intersection of a plagioclase-forming reaction and the peristerite immiscibility gap in an isobaric T-XAn diagram. The greenschist zone is characterized by albite, the transition zone by occurrence of peristerite pairs and the amphibolite zone by plagioclase of An 20-50.

Original languageEnglish
Pages (from-to)268-276
Number of pages9
JournalContributions to Mineralogy and Petrology
Volume81
Issue number4
DOIs
Publication statusPublished - Dec 1982
Externally publishedYes

Fingerprint

Metamorphic rocks
metamorphic rocks
plagioclase
albite
metamorphic rock
grade
greenschist
New Zealand
geotemperature
immiscibility
geothermometry
aureole
granite
amphibolite
limbs
Chemical analysis
transition zone
intersections
limb
Japan

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

The peristerite gap in low-grade metamorphic rocks. / Maruyama, S.; Liou, J. G.; Suzuki, K.

In: Contributions to Mineralogy and Petrology, Vol. 81, No. 4, 12.1982, p. 268-276.

Research output: Contribution to journalArticle

Maruyama, S. ; Liou, J. G. ; Suzuki, K. / The peristerite gap in low-grade metamorphic rocks. In: Contributions to Mineralogy and Petrology. 1982 ; Vol. 81, No. 4. pp. 268-276.
@article{6008ca6a25574bc99620e0063803cbf6,
title = "The peristerite gap in low-grade metamorphic rocks",
abstract = "Coexisting Na-plagioclases from greenschists both in the thermal aureole of the Kasugamura Granite, Japan, and in the low-P metamorphic zone of Yap Island, western Pacific were analyzed in great detail; the peristerite solvus was determined for each suite. The asymmetric solvus has steep albite-rich and gentle oligoclase-rich limbs that are similar to those for higher pressure series. The present results together with those from Vermont, New Zealand, and the Sanbagawa belt indicate that the peristerite solvus shifts toward the albite component and higher temperature with increasing pressure. With increasing pressure, albite co-existing with oligoclase (An=100 Ca/Ca+ Na=20) varies in composition from An 8-9 (in Kasugamura), through An 3 (in Yap Island and Vermont), to An 1 (in New Zealand) and An less than 0.5 (in the Sanbagawa belt). The consolute temperatures for the peristerite solvus estimated from available geothermometry are 420° C in Kasugamura, 450-550° C in Vermont and 550°-600° C in the Sanbagawa belt. The variation of plagioclase composition in progressive metamorphic zones is explained by intersection of a plagioclase-forming reaction and the peristerite immiscibility gap in an isobaric T-XAn diagram. The greenschist zone is characterized by albite, the transition zone by occurrence of peristerite pairs and the amphibolite zone by plagioclase of An 20-50.",
author = "S. Maruyama and Liou, {J. G.} and K. Suzuki",
year = "1982",
month = "12",
doi = "10.1007/BF00371681",
language = "English",
volume = "81",
pages = "268--276",
journal = "Contributions of Mineralogy and Petrology",
issn = "0010-7999",
publisher = "Springer Verlag",
number = "4",

}

TY - JOUR

T1 - The peristerite gap in low-grade metamorphic rocks

AU - Maruyama, S.

AU - Liou, J. G.

AU - Suzuki, K.

PY - 1982/12

Y1 - 1982/12

N2 - Coexisting Na-plagioclases from greenschists both in the thermal aureole of the Kasugamura Granite, Japan, and in the low-P metamorphic zone of Yap Island, western Pacific were analyzed in great detail; the peristerite solvus was determined for each suite. The asymmetric solvus has steep albite-rich and gentle oligoclase-rich limbs that are similar to those for higher pressure series. The present results together with those from Vermont, New Zealand, and the Sanbagawa belt indicate that the peristerite solvus shifts toward the albite component and higher temperature with increasing pressure. With increasing pressure, albite co-existing with oligoclase (An=100 Ca/Ca+ Na=20) varies in composition from An 8-9 (in Kasugamura), through An 3 (in Yap Island and Vermont), to An 1 (in New Zealand) and An less than 0.5 (in the Sanbagawa belt). The consolute temperatures for the peristerite solvus estimated from available geothermometry are 420° C in Kasugamura, 450-550° C in Vermont and 550°-600° C in the Sanbagawa belt. The variation of plagioclase composition in progressive metamorphic zones is explained by intersection of a plagioclase-forming reaction and the peristerite immiscibility gap in an isobaric T-XAn diagram. The greenschist zone is characterized by albite, the transition zone by occurrence of peristerite pairs and the amphibolite zone by plagioclase of An 20-50.

AB - Coexisting Na-plagioclases from greenschists both in the thermal aureole of the Kasugamura Granite, Japan, and in the low-P metamorphic zone of Yap Island, western Pacific were analyzed in great detail; the peristerite solvus was determined for each suite. The asymmetric solvus has steep albite-rich and gentle oligoclase-rich limbs that are similar to those for higher pressure series. The present results together with those from Vermont, New Zealand, and the Sanbagawa belt indicate that the peristerite solvus shifts toward the albite component and higher temperature with increasing pressure. With increasing pressure, albite co-existing with oligoclase (An=100 Ca/Ca+ Na=20) varies in composition from An 8-9 (in Kasugamura), through An 3 (in Yap Island and Vermont), to An 1 (in New Zealand) and An less than 0.5 (in the Sanbagawa belt). The consolute temperatures for the peristerite solvus estimated from available geothermometry are 420° C in Kasugamura, 450-550° C in Vermont and 550°-600° C in the Sanbagawa belt. The variation of plagioclase composition in progressive metamorphic zones is explained by intersection of a plagioclase-forming reaction and the peristerite immiscibility gap in an isobaric T-XAn diagram. The greenschist zone is characterized by albite, the transition zone by occurrence of peristerite pairs and the amphibolite zone by plagioclase of An 20-50.

UR - http://www.scopus.com/inward/record.url?scp=0019912306&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0019912306&partnerID=8YFLogxK

U2 - 10.1007/BF00371681

DO - 10.1007/BF00371681

M3 - Article

AN - SCOPUS:0019912306

VL - 81

SP - 268

EP - 276

JO - Contributions of Mineralogy and Petrology

JF - Contributions of Mineralogy and Petrology

SN - 0010-7999

IS - 4

ER -