Protolith and metamorphic ages of the Haiyangsuo Complex, eastern China

A non-UHP exotic tectonic slab in the Sulu ultrahigh-pressure terrane

J. G. Liou, T. Tsujimori, W. Chu, R. Y. Zhang, J. L. Wooden

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The Haiyangsuo Complex in the NE Sulu ultrahigh-pressure (UHP) terrane has discontinuous, coastal exposures of Late Archean gneiss with amphibolitized granulite, amphibolite, Paleoproterozoic metagabbroic intrusives, and Cretaceous granitic dikes over an area of about 15 km2. The U-Pb SHRIMP dating of zircons indicates that theprotolith age of a garnet-biotite gneiss is >2500 Ma, whereas the granulite-facie metamorphism occurred at around 1800 Ma. A gabbroic intrusion was dated at ∼1730 Ma, and the formation of amphibolite-facies assemblages in both metagabbro and granulite occurred at ∼340-460 Ma. Petrologic and geochronological data indicate that these various rocks show no evidence of Triassic eclogite-facies metamorphism and Neoproterozoic protolith ages that are characteristics of Sulu-Dabie HP-UHP rocks, except Neoproterozoic inherited ages from post-collisional Jurassic granitic dikes. Haiyangsuo retrograde granulites with amphibolite-facies assemblages within the gneiss preserve relict garnet formed during granulite-facies metamorphism at ∼1.85 Ga. The Paleoproterozoic metamorphic events are almost coeval with gabbroic intrusions. The granulite-bearing gneiss unit and gabbro-dominated unit of the Haiyangsuo Complex were intruded by thin granitic dikes at about 160 Ma, which is coeval with post-collisional granitic intrusions in the Sulu terrane. We suggest that the Haiyangsuo Complex may represent a fragment of the Jiao-Liao-Ji Paleoproterozoic terrane developed at the eastern margin of the Sino-Korean basement, which was juxtaposed with the Sulu terrane prior to Jurassic granitic activity and regional deformation.

Original languageEnglish
Pages (from-to)207-226
Number of pages20
JournalMineralogy and Petrology
Volume88
Issue number1-2
DOIs
Publication statusPublished - Sep 2006
Externally publishedYes

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gneiss
Levees
Tectonics
granulite
protolith
terrane
tectonics
rock intrusions
China
slab
slabs
intrusion
Garnets
dike
metamorphism
Bearings (structural)
amphibolite facies
Rock pressure
garnets
garnet

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Protolith and metamorphic ages of the Haiyangsuo Complex, eastern China : A non-UHP exotic tectonic slab in the Sulu ultrahigh-pressure terrane. / Liou, J. G.; Tsujimori, T.; Chu, W.; Zhang, R. Y.; Wooden, J. L.

In: Mineralogy and Petrology, Vol. 88, No. 1-2, 09.2006, p. 207-226.

Research output: Contribution to journalArticle

Liou, J. G. ; Tsujimori, T. ; Chu, W. ; Zhang, R. Y. ; Wooden, J. L. / Protolith and metamorphic ages of the Haiyangsuo Complex, eastern China : A non-UHP exotic tectonic slab in the Sulu ultrahigh-pressure terrane. In: Mineralogy and Petrology. 2006 ; Vol. 88, No. 1-2. pp. 207-226.
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