Very-low-temperature record of the subduction process

A review of worldwide lawsonite eclogites

Tatsuki Tsujimori, Virginia B. Sisson, Juhn G. Liou, George E. Harlow, Sorena S. Sorensen

Research output: Contribution to journalArticle

175 Citations (Scopus)

Abstract

Lawsonite eclogites preserve a record of very-low-temperature conditions in subduction zones. All occur at active margin settings, typically characterized by accretionary complexes lithologies and as tectonic blocks within serpentinite-matrix mélange. Peak lawsonite-eclogite facies mineral assemblages (garnet + omphacite + lawsonite + rutile) typically occur in prograde-zoned garnet porphyroblasts. Their matrix is commonly overprinted by higher-temperature epidote-bearing assemblages; greenschist- or amphibolite-facies conditions erase former lawsonite-eclogite relics. Various pseudomorphs after lawsonite occur, particularly in some blueschist/eclogite transitional facies rocks. Coesite-bearing lawsonite-eclogite xenoliths in kimberlitic pipes and lawsonite pseudomorphs in some relatively low-temperature ultrahigh-pressure eclogites are known. Using inclusion assemblages in garnet, lawsonite eclogites can be classified into two types: L-type, such as those from Guatemala and British Columbia, contain garnet porphyroblasts that grew only within the lawsonite stability field and E-type, such as from the Dominican Republic, record maximum temperature in the epidote-stability field. Formation and preservation of lawsonite eclogites requires cold subduction to mantle depths and rapid exhumation. The earliest occurrences of lawsonite-eclogite facies mineral assemblages are Early Paleozoic in Spitsbergen and the New England fold belt of Australia; this suggests that since the Phanerozoic, secular cooling of Earth and subduction-zone thermal structures evolved the necessary high pressure/temperature conditions. Buoyancy of serpentinite and oblique convergence with a major strike-slip component may facilitate the exhumation of lawsonite eclogites from mantle depths.

Original languageEnglish
Pages (from-to)609-624
Number of pages16
JournalLithos
Volume92
Issue number3-4
DOIs
Publication statusPublished - Dec 2006
Externally publishedYes

Fingerprint

lawsonite
Garnets
subduction
Minerals
eclogite
Bearings (structural)
Temperature
High temperature applications
Lithology
garnet
Tectonics
Buoyancy
porphyroblast
Earth (planet)
serpentinite
Rocks
Pipe
epidote
Cooling
exhumation

Keywords

  • Cold subduction
  • Eclogite
  • HP-UHP metamorphism
  • Lawsonite
  • P-T trajectory

ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

Tsujimori, T., Sisson, V. B., Liou, J. G., Harlow, G. E., & Sorensen, S. S. (2006). Very-low-temperature record of the subduction process: A review of worldwide lawsonite eclogites. Lithos, 92(3-4), 609-624. https://doi.org/10.1016/j.lithos.2006.03.054

Very-low-temperature record of the subduction process : A review of worldwide lawsonite eclogites. / Tsujimori, Tatsuki; Sisson, Virginia B.; Liou, Juhn G.; Harlow, George E.; Sorensen, Sorena S.

In: Lithos, Vol. 92, No. 3-4, 12.2006, p. 609-624.

Research output: Contribution to journalArticle

Tsujimori, T, Sisson, VB, Liou, JG, Harlow, GE & Sorensen, SS 2006, 'Very-low-temperature record of the subduction process: A review of worldwide lawsonite eclogites', Lithos, vol. 92, no. 3-4, pp. 609-624. https://doi.org/10.1016/j.lithos.2006.03.054
Tsujimori, Tatsuki ; Sisson, Virginia B. ; Liou, Juhn G. ; Harlow, George E. ; Sorensen, Sorena S. / Very-low-temperature record of the subduction process : A review of worldwide lawsonite eclogites. In: Lithos. 2006 ; Vol. 92, No. 3-4. pp. 609-624.
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