碱金属元素对山东蓝宝石结晶的促进作用研究  

A study on the mechanism that the alkali elements promote the crystal of sapphire

作　　者：张战军[1] 赫英[1] 李洪英[1] 

机构地区：[1]西北大学地质学系/大陆动力学国家重点实验室,陕西西安710069

出　　处：《西北大学学报（自然科学版）》2006年第6期967-971,共5页Journal of Northwest University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(40372052)

摘　　要：目的研究碱金属元素对山东蓝宝石结晶的促进作用。方法对山东蓝宝石寄主玄武岩的主量、微量、稀土元素以及蓝宝石包裹体中的主量元素进行分析,再对碱金属氧化物在岩浆网络中的化学行为进行研究。结果晶出山东蓝宝石的母岩浆源于富集地幔的低度熔融,并在蓝宝石结晶前或者结晶过程中与下地壳发生过强烈的壳—幔交互作用,这种交互作用为母源岩浆提供了充足的硅铝质和碱金属氧化物;其中的铝质为蓝宝石的结晶提供了物质基础,而碱金属氧化物则极大地促进了蓝宝石的结晶。结论碱金属元素对山东蓝宝石的结晶有积极的推动作用。Aim To study the promotion action by alkali elements to the crystal of sapphire. Methods Analyse the main trace and rare earth elements content of Shandong sapphire-hosted basalt and the main elements content of the inclusions in sapphire,then study the chemical action of the alkali elements in magma net. Results Shandong sapphire may have crystalized in a kind of magma which originated from the small-extent melting of enrichment mantle, and this magma must have undergone the violent interaction with under crust before or during the crystal of sapphire, which supplied mother magma a mass of Al, Si and alkali elements. Alkali is perhaps the essential matter for the crystal of sapphire, and the alkali elements can promote the crystal of sapphire on a great extent. Conclusion Alkali elements have the positive effect on the crystal of sapphire.

关 键 词：蓝宝石 碱金属元素 壳-幔交互作用 岩浆网络 

分 类 号：P595[天文地球—地球化学]