| 内蒙古白乃庙地区绿片岩和花岗闪长斑岩的钕和锶同位素研究 |
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| 关键词:Nd and Sr isotopes greenschist and granodiorite Inner Mongolia |
| 基金项目:国家青年自然科学基金;内蒙古地质矿产局 |
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| Nd-and Sr-Isotope Study on Greenschist and Granodiorite of the Bainaimiao District,Inner Mongolia,China |
| Sm-Nd AND Rb-Sr isotope data for greenschist of the Bainaimiao Group,bainaimiao granodioriteand Zhuandayingzhi hornblende-plagioclase gneiss,Inner Mongolia,China are presented in the paper.Seven whole rock samples of the greenschist give a Sm-Nd isochron age of 1107±28Ma(2δ)withεNd(t)value of+7.1±1.1(2d),which is in agreement with a previously reported U-Pb zircon age of1130+16Ma(2δ).Eight whole rock samples of the granodiorite, which intruded into the Bainaimiaogreenschist give a Sm-Nd isochron age of 440±40Ma(2δ)with εNd(t)value of-3.2±1.7 (2δ).This confirms assumption that the granodiorite was formed during Caledonian orogeny.The Rb-Sr isotopic system has been strongly distubed.This is consistent with petrographic andtectonic studies,which indicate that all greenschist,granodiorite and hornblende-plagioclase gneisshave undergone in tensive metamorphism and tectonism.The initial ratios of the Nd isotope signaturessuggested that the greenschist of the Bainaimiao Group was originally derived from a depleted mantlesource.The εNd(t)value of the Bainaimiao granodiorite indicates that it may have been formed by par-tial melting of the mixed mantle-derived greenschist and curst-related hornbled-plagioclase gneiss. |
| NIE Feng-jun,PEI Rong-fu,WU Liang-shi,Bjore.,A.1995.Nd-and Sr-Isotope Study on Greenschist and Granodiorite of the Bainaimiao District,Inner Mongolia,China[J].Acta Geoscientica Sinica,16(1):36-44. |
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