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Glass melt inclusion in clinopyroxene from Linqu Cenozoic basalt, Shandong Province, China
  • ISSN号:1001-6538
  • 期刊名称:科学通报(英文版)
  • 时间:0
  • 页码:1869-1876
  • 语言:中文
  • 分类:P58[天文地球—岩石学;天文地球—地质学]
  • 作者机构:[1]State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China, [2]Institute for Study of the Earth's Interior, Okayama University at Misasa, Tottori 682-0193, Japan
  • 相关基金:Acknowledgements Ma Yuguang and Mao Qian are thanked for their assistance in electron microprobe analyses at the State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences. The authors also greatly appreciate the constructive comments from Y. G Xu and other reviewers. This work was supported by the National Natural Science Foundation of China (Grant Nos. 40534022 and 40225009).
  • 相关项目:华北东部中生代岩石圈地幔的改造过程:橄榄岩-熔体相互作用
中文摘要:

从 Linqu 县的新生代暗岩,山东省,中国乘火车 someclinopy-roxene 晶体,许多包含丰富的玻璃融化包括。这些融化包括在有在 10-50 妈妈的一个范围的大多数谷物尺寸的形状是极其不规则的并且与 Iow-Mg~#olivines,拉长石和 Ca 富有的钾长石共存。在原处,专业和微量元素分析证明玻璃融化包括在碱高( Na_2O+K_2O 】 10 wtpercent ), SiO_2 ( 】54 wt 百分比)( 】4 wt 百分比), CaO 和 FeO ,但是在 MgO 低(Mg~#【 20 ),并且 haveLREE 丰富(( Ce/Yb )_( cn )= 11.6 - 16.4 )并且显然积极的 Eu 异例(Eu/Eu~*】 2 ),因此有 phonoli-tic 作文。cli-nopyroxene 晶体的组合特征,玻璃融化包括,他们的共存的矿物质建议这些融化包括是异国情调的在在主人暗岩在他们的乘火车以前套住的 clinopyroxenes 融化。这些的发现融化包括提供一条新途径给进一步在东南的诺思中国 Craton 下面调查中生代 lithosphericmantle 的进化。

英文摘要:

Cenozoic basalts from the Linqu County, Shandong Province, China entrain some clinopyroxene crystals, of which many contain abundant glass melt inclusions. These melt inclusions are extremely irregular in shape with most grain sizes in a range of 10-50 μm and coexist with low-Mg^# olivines, labradorites and Ca-rich potassium feldspars. In-situ major and trace element analyses show that the glass melt inclusions are high in alkalis (Na2O+K2O 〉 10 wt%), SiO2 (〉54 wt%), CaO and FeO (〉4 wt%), but low in MgO (Mg# 〈 20), and have LREE enrichments ((Ce/Yb)cn = 11.6-16.4) and apparently positive Eu anomalies (Eu/Eu^* 〉 2), thus having phonolitic compositions. The compositional features of clinopyroxene crystals, glass melt inclusions and their coexistent minerals suggest that these melt inclusions were exotic melts in clinopyroxenes trapped prior to their entrainment in the host basalt. The discovery of these melt inclusions provides a new approach to further investigating the evolution of Mesozoic lithospheric mantle beneath the southeastern North China Craton.

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