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云南大理苦橄岩的Re-Os同位素特征:对峨眉山大火成岩省成因的制约
郝艳丽; 黄启帅; 张晓冉; 史仁灯
Source Publication岩石学报
2011
Issue10
Abstract云南大理苦橄岩产出于峨眉山大火成岩省内带,位于峨眉山玄武岩系底部。岩石具斑状结构,斑晶占20%~40%左右,由自形-半自形的橄榄石和单斜辉石组成;基质约占60%~80%,主要由长条状斜长石和颗粒状单斜辉石组成,辉绿结构;含少量尖晶石。绝大部分样品全岩SiO2低于47%,为45.94%~46.37%(1个样品达47.35%),MgO大于18%,介于19.01%~23.77%之间,Na2O+K2O低于2%,介于1.52%~1.97%之间,具典型苦橄岩的岩相学和岩石化学特征。全岩Re含量变化范围较小,介于0.349×10-9~0.424×10-9之间;Os含量变化范围较大,介于0.889×10-9~4.276×10-9之间;187Re/188Os=0.437±0.012~2.708±0.025,187Os/188Os=0.1283±0.0002~0.1354±0.0004;从中分选出的橄榄石的Re、Os含量分别为0.030×10-9~0.049×10-9、0.625×10-9~0.757×10-9,187Re/188Os=0.191±0.038~0.377±0.062,187Os/188Os=0.1254±0.0005~0.1268±0.0005,均低于全岩;尖晶石的Os含量最高,为80.5×10-9,187Os/188Os最低,为0.1252±0.0003。经质量平衡计算,基质的187Os/188Os比值介于0.1380~0.1415之间,与原始上地幔相比,基质的Re-Os同位素组成具有壳层熔岩的特点,而橄榄石和尖晶石具有熔融残留相的特点,基质的γOs大于0,介于+2.0~+3.28之间,矿物的γOs均小于0,介于-2.01~-2.59之间,显示明显的亏损特征,无核-幔边界源区信息,而全岩的介于-1.11~-3.24之间,为基质和斑晶及尖晶石的混合结果,推测峨眉山大火成岩省是壳-幔相互作用的产物。
Language中文
Keyword苦橄岩 壳-幔作用 Re-os同位素 峨眉山大火成岩省 大理
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/1877
Collection图书馆
Recommended Citation
GB/T 7714
郝艳丽,黄启帅,张晓冉,等. 云南大理苦橄岩的Re-Os同位素特征:对峨眉山大火成岩省成因的制约[J]. 岩石学报,2011(10).
APA 郝艳丽,黄启帅,张晓冉,&史仁灯.(2011).云南大理苦橄岩的Re-Os同位素特征:对峨眉山大火成岩省成因的制约.岩石学报(10).
MLA 郝艳丽,et al."云南大理苦橄岩的Re-Os同位素特征:对峨眉山大火成岩省成因的制约".岩石学报 .10(2011).
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