TY - JOUR
T1 - Glass melt inclusion in clinopyroxene from Linqu Cenozoic basalt, Shandong Province, China
AU - Zhang, Hongfu
AU - Eizo, Nakamura
AU - Zhang, Jin
AU - Akira, Ishikawa
N1 - Funding Information:
Acknowledgements Ma Yuguang and Mao Qian are thanked for their assistance in electron microprobe analyses at the State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences. The authors also greatly appreciate the constructive comments from Y. G. Xu and other reviewers. This work was supported by the National Natural Science Foundation of China (Grant Nos. 40534022 and 40225009).
PY - 2006/8
Y1 - 2006/8
N2 - Cenozoic basalts from the Linqu County, Shandong Province, China entrain some clinopyroxene crystals, of which many contain abundant glass melt inclusions. These melt inclusions are extremely irregular in shape with most grain sizes in a range of 10-50 μm and coexist with low-Mg# olivines, labradorites and Ca-rich potassium feldspars. In-situ major and trace element analyses show that the glass melt inclusions are high in alkalis (Na2O+K2O > 10 wt%), SiO2 (>54 wt%), CaO and FeO (>4 wt%), but low in MgO (Mg# < 20), and have LREE enrichments ((Ce/Yb)cn = 11.6-16.4) and apparently positive Eu anomalies (Eu/Eu*> 2), thus having phonolitic compositions. The compositional features of clinopyroxene crystals, glass melt inclusions and their coexistent minerals suggest that these melt inclusions were exotic melts in clinopyroxenes trapped prior to their entrainment in the host basalt. The discovery of these melt inclusions provides a new approach to further investigating the evolution of Mesozoic lithospheric mantle beneath the southeastern North China Craton.
AB - Cenozoic basalts from the Linqu County, Shandong Province, China entrain some clinopyroxene crystals, of which many contain abundant glass melt inclusions. These melt inclusions are extremely irregular in shape with most grain sizes in a range of 10-50 μm and coexist with low-Mg# olivines, labradorites and Ca-rich potassium feldspars. In-situ major and trace element analyses show that the glass melt inclusions are high in alkalis (Na2O+K2O > 10 wt%), SiO2 (>54 wt%), CaO and FeO (>4 wt%), but low in MgO (Mg# < 20), and have LREE enrichments ((Ce/Yb)cn = 11.6-16.4) and apparently positive Eu anomalies (Eu/Eu*> 2), thus having phonolitic compositions. The compositional features of clinopyroxene crystals, glass melt inclusions and their coexistent minerals suggest that these melt inclusions were exotic melts in clinopyroxenes trapped prior to their entrainment in the host basalt. The discovery of these melt inclusions provides a new approach to further investigating the evolution of Mesozoic lithospheric mantle beneath the southeastern North China Craton.
KW - Cenozoic basalt
KW - Clinopyroxene
KW - Crustal source
KW - Glass melt inclusion
KW - Linqu
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U2 - 10.1007/s11434-006-2058-4
DO - 10.1007/s11434-006-2058-4
M3 - Article
AN - SCOPUS:33749050056
SN - 1001-6538
VL - 51
SP - 1869
EP - 1876
JO - Chinese Science Bulletin
JF - Chinese Science Bulletin
IS - 15
ER -