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Cogenetic relationship of the Yangkou gabbro-to-granite unit, Su-Lu terrane, eastern China, and implications for UHP metamorphism

B. CHEN, B.-m. JAHN, K. YE and J.B. LIU
Journal of the Geological Society, 159, 457-467, 1 July 2002, https://doi.org/10.1144/0016-764901-122
B. CHEN
22Géosciences Rennes, UPR CNRS 4661, Université de Rennes 1, 35042 Rennes Cedex, France
11Department of Geology, Peking University, Beijing 100871, P.R. China (e-mail: bchen@geoms.geo.pku.edu.cn)
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B.-m. JAHN
22Géosciences Rennes, UPR CNRS 4661, Université de Rennes 1, 35042 Rennes Cedex, France
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K. YE
33Laboratory of Lithosphere Tectonic Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, PO Box 9825, P.R. China
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J.B. LIU
33Laboratory of Lithosphere Tectonic Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, PO Box 9825, P.R. China
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Abstract

The Yangkou gabbro-to-granite complex is a petrotectonic unit of the Su-Lu ultrahigh-pressure (UHP) metamorphic terrane in eastern China. It consists of lherzolites, metagabbro–eclogites, metagranodiorites and deformed granites. Whether or not the felsic members of the complex have undergone UHP metamorphism as is recorded in the metagabbro–eclogites is significant to understanding the relationship between eclogite and host rock. The metagabbro–eclogites have low εNd (220 Ma) values (−17 to −12) at the time of UHP metamorphism, indicating that their protoliths are old mafic intrusive rocks emplaced in a continental domain. Geochemical and isotopic studies for the Yangkou unit suggest that the protoliths of the unit (except eclogites) represent a cogenetic magmatic suite, produced by differentiation of a mafic parental magma. The parental magma was derived from melting of a long-term enriched mantle, and was emplaced into a crustal level during continental extension at c. 700–800 Ma. The cogenetic relationship for the protoliths of the unit suggests that the metagranodiorites and deformed granites were also subducted to extreme mantle depths along with the metagabbro–eclogites at c. 220 Ma. The lherzolites, however, are genetically not related to the mafic protoliths; they represent ‘mantle xenoliths’ of tectonic origin.

  • Yangkou unit
  • eclogites
  • metagranites
  • Nd/Sr isotopes
  • ultrahigh pressure
  • metamorphism
  • © 2002 The Geological Society of London
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Journal of the Geological Society: 159 (4)
Journal of the Geological Society
Volume 159, Issue 4
July 2002
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Cogenetic relationship of the Yangkou gabbro-to-granite unit, Su-Lu terrane, eastern China, and implications for UHP metamorphism

B. CHEN, B.-m. JAHN, K. YE and J.B. LIU
Journal of the Geological Society, 159, 457-467, 1 July 2002, https://doi.org/10.1144/0016-764901-122
B. CHEN
22Géosciences Rennes, UPR CNRS 4661, Université de Rennes 1, 35042 Rennes Cedex, France
11Department of Geology, Peking University, Beijing 100871, P.R. China (e-mail: bchen@geoms.geo.pku.edu.cn)
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
B.-m. JAHN
22Géosciences Rennes, UPR CNRS 4661, Université de Rennes 1, 35042 Rennes Cedex, France
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
K. YE
33Laboratory of Lithosphere Tectonic Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, PO Box 9825, P.R. China
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
J.B. LIU
33Laboratory of Lithosphere Tectonic Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, PO Box 9825, P.R. China
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  • Find this author on PubMed
  • Search for this author on this site

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Cogenetic relationship of the Yangkou gabbro-to-granite unit, Su-Lu terrane, eastern China, and implications for UHP metamorphism

B. CHEN, B.-m. JAHN, K. YE and J.B. LIU
Journal of the Geological Society, 159, 457-467, 1 July 2002, https://doi.org/10.1144/0016-764901-122
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