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Article: A-type granite belts of two chemical subgroups in central eastern China: Indication of ridge subduction

TitleA-type granite belts of two chemical subgroups in central eastern China: Indication of ridge subduction
Authors
KeywordsA-Type Granite
Adakite
Lower Yangtze River Belt
Mantle Metasomatism
Ridge Subduction
Slab Window
Issue Date2012
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2012, v. 150, p. 26-36 How to Cite?
Abstract
Early Cretaceous A-type granites in the Lower Yangtze River belt, central eastern China, with both A 1 and A 2 chemical subgroups, formed at 125 ± 2 Ma, after a Cretaceous ridge subduction. Remarkably, A 1 and A 2 group granites are distributed in three zones, roughly parallel to each other and to a slightly older adakite belt. In general, A 1 granites form in intraplate settings, whereas A 2 granites near paleo-convergent margins. The alternate distribution of these two subgroup A-type granites is compatible with a proposed Cretaceous ridge subduction in the region. The subduction of a dry and hot spreading ridge may have only released small amount of fluids, so that metasomatism on the overriding lithosphere was undetectable, correspondingly resulted in A 1 granites later on. In contrast, wetter and colder oceanic crust away from the spreading ridge was responsible for mantle metasomatism and consequently the formation of A 2 granites. Further away from the ridge, the subduction angle was much steeper, and dehydration of the slab had occurred earlier during the subduction, and thus dramatically reduced mantle metasomatism, corresponding to A 1 granites again. Both A 1 and A 2 granites formed within a short period of time due to slab window/rollback, after the ridge subduction. The distribution of the A 1 and A 2 granites together with the adakite belt may be taken as discrimination indice for ancient ridge subduction. © 2011 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/151337
ISSN
2013 Impact Factor: 3.654
2013 SCImago Journal Rankings: 2.514
ISI Accession Number ID

 

Author Affiliations
  1. Graduate University of Chinese Academy of Sciences
  2. The University of Hong Kong
  3. University of Science and Technology of China
  4. Guangzhou Institute of Geochemistry Chinese Academy of Sciences
DC FieldValueLanguage
dc.contributor.authorLi, Hen_US
dc.contributor.authorLing, Mxen_US
dc.contributor.authorLi, Cyen_US
dc.contributor.authorZhang, Hen_US
dc.contributor.authorDing, Xen_US
dc.contributor.authorYang, Xyen_US
dc.contributor.authorFan, Wmen_US
dc.contributor.authorLi, Ylen_US
dc.contributor.authorSun, Wden_US
dc.date.accessioned2012-06-26T06:20:49Z-
dc.date.available2012-06-26T06:20:49Z-
dc.date.issued2012en_US
dc.identifier.citationLithos, 2012, v. 150, p. 26-36en_US
dc.identifier.issn0024-4937en_US
dc.identifier.urihttp://hdl.handle.net/10722/151337-
dc.description.abstractEarly Cretaceous A-type granites in the Lower Yangtze River belt, central eastern China, with both A 1 and A 2 chemical subgroups, formed at 125 ± 2 Ma, after a Cretaceous ridge subduction. Remarkably, A 1 and A 2 group granites are distributed in three zones, roughly parallel to each other and to a slightly older adakite belt. In general, A 1 granites form in intraplate settings, whereas A 2 granites near paleo-convergent margins. The alternate distribution of these two subgroup A-type granites is compatible with a proposed Cretaceous ridge subduction in the region. The subduction of a dry and hot spreading ridge may have only released small amount of fluids, so that metasomatism on the overriding lithosphere was undetectable, correspondingly resulted in A 1 granites later on. In contrast, wetter and colder oceanic crust away from the spreading ridge was responsible for mantle metasomatism and consequently the formation of A 2 granites. Further away from the ridge, the subduction angle was much steeper, and dehydration of the slab had occurred earlier during the subduction, and thus dramatically reduced mantle metasomatism, corresponding to A 1 granites again. Both A 1 and A 2 granites formed within a short period of time due to slab window/rollback, after the ridge subduction. The distribution of the A 1 and A 2 granites together with the adakite belt may be taken as discrimination indice for ancient ridge subduction. © 2011 Elsevier B.V. All rights reserved.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithosen_US
dc.relation.ispartofLithosen_US
dc.subjectA-Type Graniteen_US
dc.subjectAdakiteen_US
dc.subjectLower Yangtze River Belten_US
dc.subjectMantle Metasomatismen_US
dc.subjectRidge Subductionen_US
dc.subjectSlab Windowen_US
dc.titleA-type granite belts of two chemical subgroups in central eastern China: Indication of ridge subductionen_US
dc.typeArticleen_US
dc.identifier.emailLi, Yl:yiliang@hkucc.hku.hken_US
dc.identifier.authorityLi, Yl=rp01354en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.lithos.2011.09.021en_US
dc.identifier.scopuseid_2-s2.0-84865767004en_US
dc.identifier.isiWOS:000309616000003-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridLi, H=53879885000en_US
dc.identifier.scopusauthoridLing, Mx=15753870500en_US
dc.identifier.scopusauthoridLi, Cy=51663907900en_US
dc.identifier.scopusauthoridZhang, H=53880815900en_US
dc.identifier.scopusauthoridDing, X=7401929562en_US
dc.identifier.scopusauthoridYang, Xy=7408599296en_US
dc.identifier.scopusauthoridFan, Wm=7401635313en_US
dc.identifier.scopusauthoridLi, Yl=27171876700en_US
dc.identifier.scopusauthoridSun, Wd=7404011201en_US
dc.identifier.citeulike9904969-

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