Chemical characteristics of the mantle-derived xenoliths from Shifeng Mountain and the sieved-texture of the clinopyroxene(浙江玉环石峰山地区橄榄玄武岩中幔源包体的化学特征及其单斜辉石的“筛状结构”)
新生代玄武岩及其幔源包体是研究地球深部上地幔物质组成和成因的探针。对发现于浙江省东南沿海玉环县石峰山地区的橄榄玄武岩及其所含的大量二辉橄榄岩包体与单斜辉石捕虏晶进行了研究。结果表明,橄榄玄武岩中这些幔源包体主要为尖晶石相,橄榄石和辉石的Mg#分别在90% 和90%~91%,对应为镁橄榄石和顽火辉石端元,尖晶石Cr#[Cr/(Cr+Al)]在0.1 左右,为富铝尖晶石,与福建明溪、浙江新昌等地玄武岩中幔源包体的矿物成分相近,指示其地幔源区部分熔融程度不高。另外,单斜辉石捕虏晶呈浑圆状,其被捕获上涌过程中与岩浆发生了少量物质交换。镜下观察与电子探针背散射图像(BSE)显示,二辉橄榄岩与捕虏晶中的单...
Main Authors: | SUXinyao(苏昕瑶), LIZilong(厉子龙) |
---|---|
Format: | Article |
Language: | zho |
Published: |
Zhejiang University Press
2019-03-01
|
Series: | Zhejiang Daxue xuebao. Lixue ban |
Subjects: | |
Online Access: | https://doi.org/10.3785/j.issn.1008-9497.2019.02.012 |
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