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Conference Paper: Collapse of the Songpan-Ganze Orogenic belt and Mesozoic mid-crustal ductile channel flow: Evidence from the Longmenshan foreland thrust belt

TitleCollapse of the Songpan-Ganze Orogenic belt and Mesozoic mid-crustal ductile channel flow: Evidence from the Longmenshan foreland thrust belt
Authors
Issue Date2008
PublisherPergamon Press.
Citation
The 18th Annual V.M. Goldschmidt Conference, Vancouver, Canada, 13-18 July 2008. In Geochimica et Cosmochimica Acta, 2008, v. 72 n. 12S, p. A1052 How to Cite?
AbstractThe early Mesozoic orogeny in the Songpan-Ganze region, SW China produced crustal thickening (~50–60 km), followed by regional extension and crustal thinning. The regional extension involved ductile deformation and metamorphism of the Sinian-Paleozoic strata around extensional domes within the Longmenshan area. This extensional deformation removed or selectively thinned the strata. The deformed rocks are marked by ductile shear zones, bedding penetrative foliation and mineral lineation. The kinematic markers indicate SSE- or south-ward motion in the northern part of Longmenshan and SE-ward motion in the middle and southern sections. The mylonitic rocks have greenschist to low amphibolite facies mineral assemblages and P-T conditions in the Silurian Maoxian group are estimated to have been 265-405°C and 0.31-0.48 GPa, consistent with a mid-crustal ductile channel flow. Previous studies placed the age of metamorphism at 190–150 Ma using 39Ar/40Ar and SHRIMP U-Pb methods. We conclude that the thickened crust was thinned by mid-crustal ductile channel flow, which then led to collapse of the Mesozoic Songpan-Ganze orogenic belt.
Persistent Identifierhttp://hdl.handle.net/10722/58668
ISSN
2015 Impact Factor: 4.315
2015 SCImago Journal Rankings: 3.016

 

DC FieldValueLanguage
dc.contributor.authorYan, DPen_HK
dc.contributor.authorZhou, MFen_HK
dc.contributor.authorWei, QQen_HK
dc.contributor.authorLiu, Hen_HK
dc.contributor.authorDong, TZen_HK
dc.contributor.authorZhang, WCen_HK
dc.contributor.authorJin, ZLen_HK
dc.date.accessioned2010-05-31T03:34:43Z-
dc.date.available2010-05-31T03:34:43Z-
dc.date.issued2008en_HK
dc.identifier.citationThe 18th Annual V.M. Goldschmidt Conference, Vancouver, Canada, 13-18 July 2008. In Geochimica et Cosmochimica Acta, 2008, v. 72 n. 12S, p. A1052en_HK
dc.identifier.issn0016-7037-
dc.identifier.urihttp://hdl.handle.net/10722/58668-
dc.description.abstractThe early Mesozoic orogeny in the Songpan-Ganze region, SW China produced crustal thickening (~50–60 km), followed by regional extension and crustal thinning. The regional extension involved ductile deformation and metamorphism of the Sinian-Paleozoic strata around extensional domes within the Longmenshan area. This extensional deformation removed or selectively thinned the strata. The deformed rocks are marked by ductile shear zones, bedding penetrative foliation and mineral lineation. The kinematic markers indicate SSE- or south-ward motion in the northern part of Longmenshan and SE-ward motion in the middle and southern sections. The mylonitic rocks have greenschist to low amphibolite facies mineral assemblages and P-T conditions in the Silurian Maoxian group are estimated to have been 265-405°C and 0.31-0.48 GPa, consistent with a mid-crustal ductile channel flow. Previous studies placed the age of metamorphism at 190–150 Ma using 39Ar/40Ar and SHRIMP U-Pb methods. We conclude that the thickened crust was thinned by mid-crustal ductile channel flow, which then led to collapse of the Mesozoic Songpan-Ganze orogenic belt.-
dc.languageengen_HK
dc.publisherPergamon Press.-
dc.relation.ispartofGeochimica et Cosmochimica Acta-
dc.titleCollapse of the Songpan-Ganze Orogenic belt and Mesozoic mid-crustal ductile channel flow: Evidence from the Longmenshan foreland thrust belten_HK
dc.typeConference_Paperen_HK
dc.identifier.emailZhou, MF: mfzhou@hkucc.hku.hken_HK
dc.identifier.authorityZhou, MF=rp00844en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.gca.2008.05.027-
dc.identifier.hkuros167313en_HK
dc.customcontrol.immutableyiu 140829-

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