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Article: New 40Ar/39Ar age constraints on the Late Palaeozoic tectonic evolution of the western Tianshan (Xinjiang, northwestern China), with emphasis on Permian fluid ingress

TitleNew 40Ar/39Ar age constraints on the Late Palaeozoic tectonic evolution of the western Tianshan (Xinjiang, northwestern China), with emphasis on Permian fluid ingress
Authors
Keywords40Ar/39Ar Geochronology
Central Asia
Chinese Tianshan
Fluids
Isotope Resetting
Issue Date2009
PublisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00531/index.htm
Citation
International Journal of Earth Sciences, 2009, v. 98 n. 6, p. 1239-1258 How to Cite?
AbstractLaser-probe dating of mylonite whole-rock samples from the North Tianshan - Main Tianshan fault zone that cross-cuts the North Tianshan domain's southern margin yielded 40Ar/39Ar spectra with 255-285 Ma ages. Biotite from an undeformed, Early Carboniferous granite, which cuts the steep mylonitic foliation in the Proterozoic basement of the Yili arcs's southern margin, gave a 263.4 ± 0.6 Ma plateau age (1σ). Pre-Carboniferous metasediments overlying this basement yielded plateau ages (1σ) of 253.3 ± 0.3 (muscovite) and 252.3 ± 0.3 (biotite) Ma. The Permian ages of mylonites date movement on these ductile, dextral strike-slip shear zones, whereas the mica ages are interpreted by recrystallisation as a result of fluid flow around such transcurrent faults. We propose that the Tianshan's Permian syn-tectonic bimodal magmatism was created in a non-plume-related Yellowstone-like extensional - transtensional tectonic regime. Gold mineralisation, tracing aqueous flow in the crust, peaked in Permian time and continued locally into the Triassic. The picture is emerging that a convective fluid system partly driven by magmatic heat, existed in a strongly fractured and weakened crust with an elevated heat flow, leading to regional-scale isotope resetting. We suggest that surprisingly young isotopic ages in the literature for early orogenic (ultra)high-pressure metamorphism are similarly due to fluid-mediated recrystallisation. © Springer-Verlag 2008.
Persistent Identifierhttp://hdl.handle.net/10722/92186
ISSN
2015 Impact Factor: 2.133
2015 SCImago Journal Rankings: 0.992
ISI Accession Number ID
Funding AgencyGrant Number
l'Institut des Sciences de la Terre d'Orleans (ISTO)
National Basic Research Program of China2007CB411301
2001CB409804
French Embassy in Beijing
French-Chinese Advanced Research ProgramPRA T05-02
Colleagues of the Bureau of National305
Funding Information:

The senior author (KdJ) would like to dedicate this work to the memory of Prof. Oen Ing Soen, his teacher in ore geology at the University of Amsterdam, and his advice to never underestimate the role of fluids. This work was undertaken while KdJ was associated to the Institute of Advanced Studies Studium (R) (CNRS and Region Centre) on the invitation of Prof. Michel Faure. The analytical work was financed by l'Institut des Sciences de la Terre d'Orleans (ISTO). This research is supported by the National Basic Research Program of China (973 Program) (Nos. 2007CB411301 and 2001CB409804). Funding of a part of the research of BW in France by the French Embassy in Beijing and the French-Chinese Advanced Research Program (PRA T05-02) is gratefully acknowledged. Colleagues of the Bureau of National project 305, Xinjiang Uyghur Autonomous Region are thanked for their help with logistic support during fieldwork. The paper benefitted from reviews and suggestions from Jun Gao and Reiner Klemd. The invitation by topic editor Wenjiao Xiao to place our results in a geodynamic context is appreciated. Jun Gao and Wenjiao Xiao are thanked for kindly supplying pre-prints of their work. Nina Volkova supplied some of the Russian literature used.

References

 

DC FieldValueLanguage
dc.contributor.authorde Jong, Ken_HK
dc.contributor.authorWang, Ben_HK
dc.contributor.authorFaure, Men_HK
dc.contributor.authorShu, Len_HK
dc.contributor.authorCluzel, Den_HK
dc.contributor.authorCharvet, Jen_HK
dc.contributor.authorRuffet, Gen_HK
dc.contributor.authorChen, Yen_HK
dc.date.accessioned2010-09-17T10:38:36Z-
dc.date.available2010-09-17T10:38:36Z-
dc.date.issued2009en_HK
dc.identifier.citationInternational Journal of Earth Sciences, 2009, v. 98 n. 6, p. 1239-1258en_HK
dc.identifier.issn1437-3254en_HK
dc.identifier.urihttp://hdl.handle.net/10722/92186-
dc.description.abstractLaser-probe dating of mylonite whole-rock samples from the North Tianshan - Main Tianshan fault zone that cross-cuts the North Tianshan domain's southern margin yielded 40Ar/39Ar spectra with 255-285 Ma ages. Biotite from an undeformed, Early Carboniferous granite, which cuts the steep mylonitic foliation in the Proterozoic basement of the Yili arcs's southern margin, gave a 263.4 ± 0.6 Ma plateau age (1σ). Pre-Carboniferous metasediments overlying this basement yielded plateau ages (1σ) of 253.3 ± 0.3 (muscovite) and 252.3 ± 0.3 (biotite) Ma. The Permian ages of mylonites date movement on these ductile, dextral strike-slip shear zones, whereas the mica ages are interpreted by recrystallisation as a result of fluid flow around such transcurrent faults. We propose that the Tianshan's Permian syn-tectonic bimodal magmatism was created in a non-plume-related Yellowstone-like extensional - transtensional tectonic regime. Gold mineralisation, tracing aqueous flow in the crust, peaked in Permian time and continued locally into the Triassic. The picture is emerging that a convective fluid system partly driven by magmatic heat, existed in a strongly fractured and weakened crust with an elevated heat flow, leading to regional-scale isotope resetting. We suggest that surprisingly young isotopic ages in the literature for early orogenic (ultra)high-pressure metamorphism are similarly due to fluid-mediated recrystallisation. © Springer-Verlag 2008.en_HK
dc.languageengen_HK
dc.publisherSpringer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00531/index.htmen_HK
dc.relation.ispartofInternational Journal of Earth Sciencesen_HK
dc.subject40Ar/39Ar Geochronologyen_HK
dc.subjectCentral Asiaen_HK
dc.subjectChinese Tianshanen_HK
dc.subjectFluidsen_HK
dc.subjectIsotope Resettingen_HK
dc.titleNew 40Ar/39Ar age constraints on the Late Palaeozoic tectonic evolution of the western Tianshan (Xinjiang, northwestern China), with emphasis on Permian fluid ingressen_HK
dc.typeArticleen_HK
dc.identifier.emailChen, Y:ychenc@hkucc.hku.hken_HK
dc.identifier.authorityChen, Y=rp1318en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1007/s00531-008-0338-8en_HK
dc.identifier.scopuseid_2-s2.0-69849094299en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-69849094299&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume98en_HK
dc.identifier.issue6en_HK
dc.identifier.spage1239en_HK
dc.identifier.epage1258en_HK
dc.identifier.eissn1437-3262-
dc.identifier.isiWOS:000269376400004-

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