Constraints on timing of peak and retrograde metamorphism in the Dabie Shan Ultrahigh-Pressure Metamorphic Belt, east-central China, using U–Th–Pb dating of zircon and monazite

Ayers, John C.; Dunkle, Stacie; Gao, Shan; Miller, Calvin F.

doi:10.1016/s0009-2541(02)00008-6

Cited by 257 publications

(139 citation statements)

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“…In this study, we present a 5 combined petrologic, geochronological, Hf isotope and geochemical study on 6 different types of xenoliths sampled from the same locality (Jiagou) and use these data 7 to better constrain the composition and age of the deep crust beneath the area, thus 8 shading new light on its late-Archean to Palaeoproterozoic crustal growth and 9 evolution. Most of the xenoliths are mafic meta-igneous rocks, among which 10 garnet-bearing lithologies are common. They can be classified into three broad 11 petrographic groups: spinel-bearing garnet clinopyroxenite / phlogopite 12 clinopyroxenite / spinel pyroxenite (Group 1), garnet amphibolite or hornblendite / 13 garnet granulite / basic gneiss lacking pyroxene (Group 2), and garnet-bearing felsic 14 (intermediate-acid) gneiss (Group 3).…”

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Composition and geochronology of the deep-seated xenoliths from the southeastern margin of the North China Craton

Liu

Wang

et al. 2013

Gondwana Research

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Original Citation:Composition and geochronology of the deep-seated xenoliths from the southeastern margin of the North China Craton. Published version:DOI:10.1016/j.gr.2012.06.009 Terms of use:Open Access (Article begins on next page) Anyone can freely access the full text of works made available as "Open Access". Works made available under a Creative Commons license can be used according to the terms and conditions of said license. Use of all other works requires consent of the right holder (author or publisher) if not exempted from copyright protection by the applicable law. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 Availability: This is the author's manuscript

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“…The SHRIMP analyses 9 followed the procedures described by Williams (1998). Both optical 10 photomicrographs and CL images were taken as a guide to select the U-Pb dating 11 spots. Five scans through the mass stations were made for each age determination.…”

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Composition and geochronology of the deep-seated xenoliths from the southeastern margin of the North China Craton

Liu

Wang

et al. 2013

Gondwana Research

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“…The most likely source of that stress is the Dabie-Sulu orogen about 200 km to the south (Yang et al, under review), a major belt of high-pressure to ultra-high-pressure metamorphism and retrogression resulting from the northwards subduction of the South China Block beneath the North China Block and subsequent exhumation of the orogen during the Triassic (245-210 Ma) (Hacker et al, 1998;Ayers et al, 2002;Wan et al, 2005). The metamorphic monazite age of 217 Ma measured in present study is very close to the monazite ages of 223, 219 and 209 Ma in the Dabie UHP terrane obtained by Ayers et al, (2002) and Wan et al (2005) who interpreted the monazite as having grown during post-peak (retrograde) metamorphism. The Triassic metamorphic monazite age of the Shisanlitai phyllite is interpreted as a minimum age for peak (greenschist facies) metamorphism because the monazite formed after the main metamorphism and deformation, as indicated by its petrographic features.…”

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Mesozoic monazite in Neoproterozoic metasediments: Evidence for low-grade metamorphism of Sinian sediments during Triassic continental collision, Liaodong Peninsula, NE China

et al. 2007

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Sericite phyllite from the Sinian Shisanlitai Formation, Dalian area, Liaodong Peninsula, NE China, contains an assemblage of newly-formed lower-greenschist facies minerals (sericite, chlorite, Fe minerals and Ti minerals) plus aggregates of fine-grained monazite. The texture of the monazite, its mineral inclusions, and its close association with Fe oxide minerals show that it is not detrital or diagenetic, but a product of the low-grade metamorphism. SHRIMP U-Th-Pb dating of the monazite at 217 ± 15 Ma shows that the metamorphism, and associated regional deformation and fluid flow, occurred in the Late Triassic, coeval with the waning stages of the Dabie-Sulu orogeny. The Dabie-Sulu tectonothermal event has produced both deformation and metamorphism in rocks of the eastern North China Block at least up to ~200 km north of the main continent-continent collision zone.

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“…An in situ regional UHP metamorphism has been inferred based on the extensive occurrence of coesite inclusions in zircons from country gneiss (Ye et al, 2000b;Liu et al, 2002Liu et al, , 2004a. U-Pb and Sm-Nd chronology suggests that the UHP metamorphism of the Sulu belt occurred at 220-240 Ma, and the protolith ages of eclogite and country rock are 700-800 Ma Ames et al, 1996;Hacker et al, 1998;Ayer et al, 2002;Liu et al, 2004aLiu et al, , 2005.…”

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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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Constraints on timing of peak and retrograde metamorphism in the Dabie Shan Ultrahigh-Pressure Metamorphic Belt, east-central China, using U–Th–Pb dating of zircon and monazite

Cited by 257 publications

References 29 publications

Composition and geochronology of the deep-seated xenoliths from the southeastern margin of the North China Craton

Composition and geochronology of the deep-seated xenoliths from the southeastern margin of the North China Craton

Mesozoic monazite in Neoproterozoic metasediments: Evidence for low-grade metamorphism of Sinian sediments during Triassic continental collision, Liaodong Peninsula, NE China

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

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