Ultrahigh-Pressure (60 Kbar) Magnesite-Bearing Garnet Peridotites from Northeastern Jiangsu, China

Yang, Jianjun; Godard, Gaston; Kiénast, Jean-Robert; Lu, Yi; Sun, J. S.

doi:10.1086/648248

Cited by 177 publications

(111 citation statements)

References 28 publications

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“…Coesite-bearing and other UHP rocks are widely distributed in the two terranes (Liou and Zhang, 1995;Okay et al, 1989;Xu et al, 1992;Yang et al, 1993;Ye et al, 2000a). Available age data indicate that the continental collision and UHP metamorphism took place in Early Triassic, around 240 to 220 Ma (e.g., Ames et al, 1993Ames et al, , 1996Chavagnac and Jahn, 1996;Hacker et al, 1998Hacker et al, , 2000Li et al, 1993aLi et al, , 1996Li et al, , 1997Li et al, , 2000Rowley Qinling-Dabie-Sulu orogenic belt.…”

Section: Introductionmentioning

confidence: 99%

U-Pb zircon ages for a collision-related K-rich complex at Shidao in the Sulu ultrahigh pressure terrane, China.

et al. 2003

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The Shidao complex at the eastern extremity of the Sulu ultrahigh pressure (UHP) terrane is composed of oldest pyroxene syenite, quartz syenite and youngest granite intrusives of the K-rich shoshonitic series. U-Pb zircon dating yields nearly concordant ages of 225 ± 2, 211 ± 3 and 205 ± 5 Ma for pyroxene syenite, quartz syenite and granite, respectively. The ages closely postdate the 240 to 220 Ma UHP metamorphism and correspond to the rapid cooling and exhumation of UHP rocks. A close genetic relation may exist between the formation of the Shidao intrusives and the continental collision and UHP metamorphism. However, the K-rich Shidao intrusive rocks are different from common syn-collisional granites in association of K-rich and granitic magmatism. A breakoff model is postulated to explain the formation of the complex. The breakoff of the subducting slab caused the rapid exhumation of the UHP terrane. Mantle upwelling resulted in basaltic magmatism and formation of the K-rich complex. Formation of the Shidao complex marked the cessation of the UHP metamorphism and the oldest ages of 225 ± 2 Ma of the complex is the minimum timing for the UHP metamorphism.

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Section: Introductionmentioning

confidence: 99%

U-Pb zircon ages for a collision-related K-rich complex at Shidao in the Sulu ultrahigh pressure terrane, China.

et al. 2003

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“…Zhang et al, 2000). However, garnet peridotite and pyroxenite record higher peak P-T conditions of 750-950ºC and 40-65 kbar, as indicated by various P-T calculations and mineral exsolution textures (Yang et al, 1993;Liou et al, 1998;R. Y. Zhang et al, , 2005; R. Y.…”

Section: Geological Setting and Ccsd Sample Locationmentioning

confidence: 96%

“…1). The Sulu belt consists of amphibolite-facies granitic orthogneiss, paragneiss, amphibolite, and marble, in which abundant coesite-bearing eclogite, kyanite quartzite, and UHP garnet peridotite/pyroxenite occur as lenses, layers, or blocks (Hirajima et al, 1990;Yang et al, 1993;R. Y. Zhang et al, , 1995R.…”

Section: Geological Setting and Ccsd Sample Locationmentioning

confidence: 99%

Assemblages and Textural Evolution of UHP Eclogites from the Chinese Continental Scientific Drilling Main Hole

Tong

Jahn

Iizuka

et al. 2007

International Geology Review

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Coesite-bearing eclogite samples from the Chinese Continental Scientific Drilling main hole (100-2000 m) were examined. Three major evolutionary stages are distinguished from mineral assemblages and textural relations.(1) The pre-peak stage is indicated by inclusion assemblages in rutile eclogite such as amphibole and paragonite, with pre-peak P-T conditions of ~13 kbar and 910ºC. (2) The peak ultrahigh-pressure (UHP) metamorphic stage is characterized by the mineral assemblage garnet-omphacite-phengite-rutile-apatite-coesite/quartz pseudomorph ± kyanite; P-T conditions reached ~910ºC and ~37 kbar for rutile eclogite, and ~850ºC and ~35 kbar for phengite eclogite. (3) The retrograde stage produced decompression textures via back reactions, such as thin coronas of amphibole or zoisite on garnet, fine-grained amphibole-plagioclase symplectites on omphacite and biotite-plagioclase, or K-feldspar-albite on phengite, ilmenite or titanite on rutile, at P-T conditions of 530-560ºC and 7-9 kbar. The presence of K-feldspar-albite symplectite on phengite and minor interstitial K-feldspar implies that post-peak decompressional partial melting occurred locally during rapid exhumation of the subducted UHP slab.Two alternative P-T paths may be constructed: (1) the first possesses a different pre-peak stage but similar peak UHP to post-peak decompression cooling for rutile and phengite eclogite; (2) the second shows a consistent evolution from a pre-peak stage via peak UHP stage to a post-peak stage of near-isothermal decompression, followed by near-isobaric cooling for both rutile and phengite eclogite. We prefer the first P-T path, because the inferred paths show a clear increase in pressure and temperature from near-peak to peak UHP stage, and this may be associated with subductionrelated tectonism as a result of continental collision between the North China and Yangtze blocks. Rapid subduction and fast retrograde exhumation is likely responsible for preservation of some pre-peak inclusion assemblages and prograde mineral growth zoning.

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“…In summary, this evidence indicates a limited contribution of mantle materials to the genesis of the Guilong granodiorite Porphyries from the Yunnan Province, China. rocks likely originated through the partial melting of older crust (Hirajima et al, 1990 ;Yang et al, 1993;Zhang, D. Q. et al, 1995;Zhang, R. Y. et al, 1995;Gao et al, 1998a, b;Liu et al, 2009 Fig. 8) isotopic character.…”

Section: Mantle Contributionmentioning

confidence: 99%

U-Pb zircon age, geochemical, and Sr-Nd isotopic constraints on the age and origin of granodiorite porphyries in the Guilong area, southern Yunnan Province, South China

Liu

Chen

et al. 2013

Geochem. J.

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Ultrahigh-Pressure (60 Kbar) Magnesite-Bearing Garnet Peridotites from Northeastern Jiangsu, China

Cited by 177 publications

References 28 publications

U-Pb zircon ages for a collision-related K-rich complex at Shidao in the Sulu ultrahigh pressure terrane, China.

U-Pb zircon ages for a collision-related K-rich complex at Shidao in the Sulu ultrahigh pressure terrane, China.

Assemblages and Textural Evolution of UHP Eclogites from the Chinese Continental Scientific Drilling Main Hole

U-Pb zircon age, geochemical, and Sr-Nd isotopic constraints on the age and origin of granodiorite porphyries in the Guilong area, southern Yunnan Province, South China

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