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浙江大学学报（理学版）
浙江大学学报（理学版）  2019, Vol. 46 Issue (2): 248-259    DOI: 10.3785/j.issn.1008-9497.2019.02.012
地球科学     
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”
苏昕瑶1, 厉子龙1,2,*
1.浙江大学地球科学学院，浙江杭州310027
2.浙江大学海洋学院，浙江舟山 316021
Chemical characteristics of the mantle-derived xenoliths from Shifeng Mountain and the sieved-texture of the clinopyroxene
Xinyao SU1, Zilong LI1,2,*
1.School of Earth Sciences, Zhejiang University, Hangzhou 310027, China
2.Ocean College, Zhejiang University, Zhoushan 316021, Zhejiang Province, China
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摘要： 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斜辉石均发育有“筛状结构”，指示了明显的长英质熔体熔出现象。这种现象可以解释为早期K、Na含量较高的单斜辉石在岩浆上涌过程中发生减压，导致富含K、Na成分的熔体析出，随后经快速冷却形成，而非外来熔体交代形成。
关键词： 矿物成分特征;  筛状结构;  部分熔融;  幔源包体;  单斜辉石    
Abstract: Both of Cenozoic basalts and mantle-derived xenoliths can be as petrological probe for the earth's deep mantle components and magmatic genesis. Alkaline olivine basalt and a newly discovered mantle-derived spinel lherzolite xenolith and clinopyroxene xenocryst occur as a pipe in Shifeng Mountain of the southeast Yuhuan county in Zhejiang province, SE China. Mg# values of olivine of xenolith and orthopyroxene are ca. 90% and 90% to 91% separately, corresponding to the endmembers of forsterite and enstatite. Cr# values of spinel are ca. 0.1, being aluminum-enriched spinel, which is similar to the xenoliths from Mingxi in Fujian province and Xinchang in Zhejiang province, indicating the low degree of partial melting. The xenocryst with round shape has interaction with the melt. Backscattered electronic image shows that a sieved-texture and dark grey felsic melts are observed in clinopyroxene from spinel lherzolite xenolith and xenocryst. This phenomenon can be explained by low-pressure partial melting of the clinopyroxene of higher concept of K and Na, rather than replacement by melt.
Key words: chemical characteristics of minerals    sieved-texture    partial melting    xenolith    clinopyroxene
收稿日期: 2018-05-18 出版日期: 2019-03-25
CLC:  P 57， P 58  
基金资助: 浙江省国土资源厅科研项目（2015005）; 国家自然科学基金资助项目（91858213,41541018）； 浙江省高等教育“十三五”教学改革项目研究项目（jg20180025）.
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苏昕瑶, 厉子龙. 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”[J]. 浙江大学学报（理学版）, 2019, 46(2): 248-259.

Xinyao SU, Zilong LI. Chemical characteristics of the mantle-derived xenoliths from Shifeng Mountain and the sieved-texture of the clinopyroxene. Journal of ZheJIang University(Science Edition), 2019, 46(2): 248-259.

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https://www.zjujournals.com/sci/CN/10.3785/j.issn.1008-9497.2019.02.012    或    https://www.zjujournals.com/sci/CN/Y2019/V46/I2/248

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