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Neoproterozoic subduction along the Ailaoshan zone, South China : geochronological and geochemical evidence from amphibolite
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dc.contributor.author | Cai, Yongfeng | |
dc.contributor.author | Wang, Yuejun | |
dc.contributor.author | Cawood, Peter A. | |
dc.contributor.author | Fan, Weiming | |
dc.contributor.author | Liu, Huichuan | |
dc.contributor.author | Xing, Xiaowan | |
dc.contributor.author | Zhang, Yuzhi | |
dc.date.accessioned | 2015-04-30T23:01:50Z | |
dc.date.available | 2015-04-30T23:01:50Z | |
dc.date.issued | 2014-05 | |
dc.identifier | 134774115 | |
dc.identifier | d8501496-ede6-4e29-bef2-bd7e2ff3f7d6 | |
dc.identifier | 000335107000002 | |
dc.identifier | 84894033002 | |
dc.identifier | 000335107000002 | |
dc.identifier.citation | Cai , Y , Wang , Y , Cawood , P A , Fan , W , Liu , H , Xing , X & Zhang , Y 2014 , ' Neoproterozoic subduction along the Ailaoshan zone, South China : geochronological and geochemical evidence from amphibolite ' , Precambrian Research , vol. 245 , pp. 13-28 . https://doi.org/10.1016/j.precamres.2014.01.009 | en |
dc.identifier.issn | 0301-9268 | |
dc.identifier.uri | https://hdl.handle.net/10023/6615 | |
dc.description | This study was supported by China Natural Science Foundation (41190073 and 41372198), National Basic Research Program of China (2014CB440901) and Natural Environment Research Council (grant NE/J021822/1). | en |
dc.description.abstract | Lenses of amphibolites occur along the Ailaoshan suture zone at the southwestern margin of the Yangtze Block, South China. Petrological, geochemical and zircon U-Pb geochronological data indicate that they are divisible into two coeval groups. Group 1, represented by the Jinping amphibolite, has mg-number of 71-76 and (La/Yb)cn ratios of 7.2-7.7, and displays a geochemical affinity to island arc volcanic rocks. Group 2 amphibolites occur at Yuanyang and are characterized by high Nb contents (14.3-18.4 ppm), resembling Nb-enriched basalts. The epsilon(Nd)(t) values for Group 1 range from -3.45 to -2.04 and for Group 2 from +4.08 to +4.39. A representative sample for Group 1 yields a U-Pb zircon age of 803 7 Ma, whereas two samples for Group 2 give U-Pb zircon ages of 813 +/- 11 Ma and 814 +/- 12 Ma. Petrogenetic analysis suggests that Group 1 originated from an orthopyroxene-rich source and Group 2 from a mantle wedge modified by slab-derived melt. In combination with other geological observations, these amphibolites are inferred to constitute part of an early Neoproterozoic (similar to 815-800 Ma) arc-back-arc basin system. The Neoproterozoic amphibolites and related rocks along the Ailaoshan zone may be the southward extension of the Neoproterozoic supra-subduction zone that developed along the western margin of the Yangtze Block. (C) 2014 Elsevier B.V. All rights reserved. | |
dc.format.extent | 16 | |
dc.format.extent | 8013973 | |
dc.language.iso | eng | |
dc.relation.ispartof | Precambrian Research | en |
dc.subject | Ailaoshan zone | en |
dc.subject | Amphibolite | en |
dc.subject | Zircon U-Pb dating | en |
dc.subject | Petrogenesis | en |
dc.subject | Neoproterozoic subduction | en |
dc.subject | Zircon U-PB | en |
dc.subject | Back-arc basin | en |
dc.subject | Scientific-drilling project | en |
dc.subject | Northwestern yangtze block | en |
dc.subject | Bimodal volcanic-rocks | en |
dc.subject | River shear zone | en |
dc.subject | A-type granites | en |
dc.subject | Tectonic evolution | en |
dc.subject | Crustal evolution | en |
dc.subject | Jiangnan orogen | en |
dc.subject | QE Geology | en |
dc.subject.lcc | QE | en |
dc.title | Neoproterozoic subduction along the Ailaoshan zone, South China : geochronological and geochemical evidence from amphibolite | en |
dc.type | Journal article | en |
dc.contributor.sponsor | NERC | en |
dc.contributor.institution | University of St Andrews. Earth and Environmental Sciences | en |
dc.contributor.institution | University of St Andrews. Scottish Oceans Institute | en |
dc.contributor.institution | University of St Andrews. St Andrews Isotope Geochemistry | en |
dc.identifier.doi | https://doi.org/10.1016/j.precamres.2014.01.009 | |
dc.description.status | Peer reviewed | en |
dc.date.embargoedUntil | 2015-05-01 | |
dc.identifier.grantnumber | NE/J021822/1 | en |
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