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

Authors :
ZHANG, LEI
HAN, BAO-FU
CHEN, JIA-FU
XU, ZHAO
Source :
Geological Magazine; Jul2012, Vol. 149 Issue 4, p645-661, 17p
Publication Year :
2012

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. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00167568
Volume :
149
Issue :
4
Database :
Complementary Index
Journal :
Geological Magazine
Publication Type :
Academic Journal
Accession number :
76329332
Full Text :
https://doi.org/10.1017/S0016756811000860