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Sr–Nd isotopic characteristics of the Late Cretaceous Shuangyashan suite: evidence for enriched mantle 2 in Northeast China

Published online by Cambridge University Press:  03 November 2011

LEI ZHANG ,
BAO-FU HAN ,
JIA-FU CHEN  and
ZHAO XU
LEI ZHANG
Affiliation:
Ministry of Education Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, P. R. China Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, P. R. China
BAO-FU HAN*
Affiliation:
Ministry of Education Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, P. R. China
JIA-FU CHEN
Affiliation:
Ministry of Education Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, P. R. China
ZHAO XU
Affiliation:
Ministry of Education Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, P. R. China
*
†Author for correspondence: [email protected]
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Abstract

In Northeast China, large volumes of Mesozoic–Cenozoic igneous rocks have developed as a result of long-lasting subduction of the palaeo-Pacific and Pacific plates beneath the eastern Eurasian continent. Previous studies have convincingly confirmed the presence of depleted mantle (DM), FOcal ZOne (FOZO) mantle and enriched mantle 1 (EM1) end-members; the enriched mantle 2 (EM2) end-member is probably present but it has been poorly constrained. The Late Cretaceous Shuangyashan suite, comprising a monzogabbro and diorite–porphyrite stocks and their cumulate hornblendite enclaves, from the Shuangyashan coal basin, Northeast China, is characterized by high initial 87Sr/86Sr (0.70922–0.71095) and low initial 143Nd/144Nd ratios (0.51221–0.51238) at 98 Ma. Their occurrence demonstrates that EM2 is present in the lithospheric mantle of Northeast China and its formation may be related to recycled continental material in a subduction setting.

Keywords

Sr–Nd isotopesenriched mantle 2subductionNortheast China
Type
Original Articles
Information
Geological Magazine , Volume 149 , Issue 4 , July 2012 , pp. 645 - 661
Copyright
Copyright © Cambridge University Press 2011

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