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Mantle metasomatism by P- and F-rich melt/fluids： evidence from phosphate glass in spinel Iherzolite xenolith in Keluo, Heilonsjiang Province

ISSN号：0023-074X
期刊名称：《科学通报》
时间：0
分类：P588[天文地球—岩石学;天文地球—地质学]
作者机构：[1]State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, China, [2]School of Earth and Space Science, Peking University, Beijing 100871, China
相关基金：Supported by-the National Natural Science Foundation of China （Grant Nos. 40672039, 40221301,40125007 and 40372103） The authors would like to thank Prof. Fan Qicheng, who kindly provided samples for this research. The sincere gratitude also goes to Prof. Zhou Xinmin, whose suggestions improve this manuscript a lot. The authors thank the editors and anonymous referees for their constructive reviews and helpful suggestions.

作者： ZHANG WenLan[1], SHAO JiAn[2], XU XiSheng[1], WANG RuCheng[1], CHEN LiHui[1]

关键词：地幔, 捕虏体, 磷酸盐, 玻璃, 玄武岩, mantle xenolith, F-rich phosphate glass, P- and F-rich mantle melt/fluid, mantle metasomatism, Keluo alkaline basalt

中文摘要：

尖晶石 Iherzolite 捕虏体在 theKeluo 区域在 phonolitic alkaline 暗岩被发现， Heilongjiang 省。详细 electron-microprobe 学习揭示了丰富的磷酸盐并且在捕虏体联系了在主要阶段之间的交代矿床矿物质。当玻璃基于拉曼分阶段执行分光镜的分析， Thephosphates 被认为 P 富有、 F 富有的披风 melt/fluid，其大多数被识别的特殊剩余阶段(凝结) 。如此的 melt/fluid 另外 furthermetasomatized 主要矿物质，因此导致反应边界的形成连续地填写了 ofCr 尖晶石 symplectitic 地区和橄榄石 + 透辉石地区。因此， P 富有、 F 富有的 melt/fluidplayed 在在 Keluo 区域的上面披风的交代作用的一个重要角色。这种 metasomstism 可以发生在东方中国的一些另外的地方，这被建议。现在的结果可以也在在东方中国下面在 thelithospheric 披风学习交代矿床 melt/fluid 和它的进化的类型有意义。

英文摘要：

Spinel Iherzolite xenoliths were found in phonoliUc alkaline basalt in the Keluo area, Heilongjiang Province. Detailed electron-microprobe study revealed abundant phosphates and associated metasomatic minerals between primary phases in xenolith. The phosphates are considered special residual phases （coagulation） of P- and F-rich mantle melt/fluid, most of which were identified as glass phases based on Raman spectroscopic analyses. Such melt/fluid also further metasomatized primary minerals, thus leading to formation of reaction rims successively composed of Cr-spinel symplecUUc zone and olivine ＋ diopside zone. Therefore, the P- and F-rich melt/fluid played an important role in the upper-mantle metasomatism in the Keluo area. It is suggested that this kind of metasomstism may occur in some other places of eastern China. The present results may also have significance in studying types of metasomatic melt/fluid and its evolution in the lithospheric mantle beneath eastern China.

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