Continental subduction and exhumation of UHP rocks. Structural and geochronological insights from the Dabieshan (E. China).
type: Dataset
description: In the Dabieshan, the available models for exhumation of ultrahigh-pressure (UHP) rocks are poorly constrained by structural data. A comprehensive structural and kinematic map and a general cross-section of the Dabieshan including its foreland fold belt and the Northern Dabieshan Domain (Foziling and Luzenguang groups) are presented here. South Dabieshan consists from bottom to top of stacked allochtons: (1) an amphibolite facies gneissic unit, devoid of UHP rocks, interpreted here as the relative autochton; (2) an UHP allochton; (3) a HP rock unit (Susong group) mostly retrogressed into greenschist facies micaschists; (4) a weakly metamorphosed Proterozoic slate and sandstone unit; and (5) an unmetamorphosed Cambrian to Early Triassic sedimentary sequence unconformably covered by Jurassic sandstone. All these units exhibit a polyphase ductile deformation characterized by (i) a NW–SE lineation with a top-to-the-NW shearing, and (ii) a southward refolding of early ductile fabrics. The Central Dabieshan is a 100-km scale migmatitic dome. Newly discovered eclogite xenoliths in a Cretaceous granitoid dated at 102 Ma by the U–Pb method on titanite demonstrate that migmatization post-dates HP–UHP metamorphism. Ductile faults formed in the subsolidus state coeval to migmatization allow us to characterize the structural pattern of doming. Along the dome margins, migmatite is gneissified under post-solidus conditions and mylonitic–ultramylonitic fabrics commonly develop. The north and west boundaries of the Central Dabieshan metamorphics, i.e. the Xiaotian–Mozitan and Macheng faults, are ductile normal faults formed before Late Jurassic–Early Cretaceous. A Cretaceous reworking is recorded by synkinematic plutons. North of the Xiaotian–Mozitan fault, the North Dabieshan Domain consists of metasediments and orthogneiss (Foziling and Luzenguang groups) metamorphosed under greenschist to amphibolite facies which never experienced UHP metamorphism. A rare N–S-trending lineation w…
issued: 2026-05-20T02:17:40.747175
language: en
modified: 2026-05-20T02:17:40.747180
contact point: Organization
  fn: CCSD
keyword: continental-subduction
keyword: dabieshan
keyword: ductile-deformation
keyword: exhumation
keyword: infoeu-reposemanticsarticle
keyword: journal-articles
keyword: sdustutesciences-of-the-universe-physicsearth-sciencestectonics
keyword: ultrahigh-pressure-metamorphism
landing page: 0024-4937

Continental subduction and exhumation of UHP rocks. Structural and geochronological insights from the Dabieshan (E. China).
type: Distribution
format: HTML
issued: 2026-05-20T02:17:40.789515
modified: 2026-05-20T02:17:40.720388
access URL: https://insu.hal.science/hal-00069382

test_moissonnage_selune
type: Agent