Cited by 453Geological and Geochemical AnalysisGeochemistry and Geochronology of Asian Mineral DepositsHigh-pressure geophysics and materials

High-pressure granulites (retrograded eclogites) from the Hengshan Complex, North China Craton: Petrology and tectonic implications

ZHAO, GUOCHUN, CAWOOD, PETER A., WILDE, SIMON A., LU, LIANGZHAO·2001·Journal of Petrology

Abstract

Both high- and medium-pressure granulites have been found as enclaves and boudins in tonalitic–trondhjemitic–granodioritic gneisses in the Hengshan Complex. Petrological evidence from these rocks indicates four distinct metamorphic assemblages. The early prograde assemblage (M1) is preserved only in the high-pressure granulites and represented by quartz and rutile inclusions within the cores of garnet porphyroblasts, and omphacite pseudomorphs that are indicated by clinopyroxene + sodic plagioclase symplectic intergrowths. The peak assemblage (M2) consists of clinopyroxene + garnet + sodic plagioclase + quartz ± hornblende in the high-pressure granulites and orthopyroxene + clinopyroxene + garnet + plagioclase + quartz in the medium-pressure granulites. Peak metamorphism was followed by near-isothermal decompression (M3), which resulted in the development of orthopyroxene + clinopyroxene + plagioclase symplectites and coronas surrounding embayed garnet grains, and decompression-cooling (M4), represented by hornblende + plagioclase symplectites on garnet. The THERMOCALC program yielded peak (M2) P–T conditions of 13·4–15·5 kbar and 770–840°C for the high-pressure granulites and 9–11 kbar and 820–870°C for the medium-pressure granulites, based on the core compositions of garnet, matrix pyroxene and plagioclase. The P–T conditions of pyroxene + plagioclase symplectite and corona (M3) were estimated at ∼6·5–8·0 kbar and 750–830°C, and hornblende + plagioclase symplectite (M4) at ∼4·5–6·0 kbar and 680–790°C. The P–T conditions of the early prograde assemblage (M1) cannot be quantitatively estimated because of the absence of modal minerals. The combination of petrographic textures, mineral compositions, metamorphic reaction history, petrogenetic grids and thermobarometric data defines a near-isothermal decompressional clockwise P–T path for the Hengshan granulites, suggesting that the Hengshan Complex underwent initial crustal thickening, subsequent exhumation, and cooling and retrogression. This tectonothermal path is considered to record a major phase of collision between two continental blocks, which resulted in the final assembly of the North China Craton at ∼1·8 Ga.

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Crossref · 10.1093/petrology/42.6.1141

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  • Two essential types of HPG occur in the geological record: a high- to ultrahigh-temperature group and a group representing overprinted eclogites.

    “Two essential types of HPG occur in the geological record: a high-to ultrahigh-temperature group and a group representing overprinted eclogites”

    From Secular change and the onset of plate tectonics on Earth (2020) · cites this paper as Zhao et al., 2001

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Authors
ZHAO, G., CAWOOD, P. A., WILDE, S. A., & LU, L.
Affiliations
  • Curtin University (AU)
  • Changchun University of Science and Technology (CN)
Venue
Journal of Petrology
Published
2001-06
Volume
42
Issue
6
Pages
1141-1170
ISSN
  • 0022-3530 (ISSN-L)
  • 1460-2415
OpenAlex
W2134675340
Cited by
453
References
53
Citations by year
2026: 8 · 2025: 6 · 2024: 18 · 2023: 18 · 2022: 25 · 2021: 24 · 2020: 23 · 2019: 22 · 2018: 15 · 2017: 41 · 2016: 26 · 2015: 22 · 2014: 31 · 2013: 19 · 2012: 16
FWCI
10.40
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Petrology (publishedVersion)
  • UWA Profiles and Research Repository (UWA) (submittedVersion)
  • The HKU Scholars Hub (University of Hong Kong) (submittedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
  • Social Sciences › Economics, Econometrics and Finance › Economics and Econometrics › Geochemistry and Geochronology of Asian Mineral Deposits
  • Physical Sciences › Earth and Planetary Sciences › Geophysics › High-pressure geophysics and materials
Keywords
high-pressure granulites, North China Craton, metamorphic petrology, pressure-temperature conditions, decompression, symplectites, garnet porphyroblasts, petrogenetic grid, Thermo-Calc, tectonic implications

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