云南建水县长岭岗碱性侵入岩体岩石特征与成因  

THE LITHOLOGIC CHARACTER AND GENESIS OF CHANGLINGGANG ALKALI INTRUSION IN JIANSHUI,YUNNAN

作　　者：李新仁 王长兵 张黎 LI Xin-ren;WANG Chang-bing;ZHANG Li(Yunnan Exploration-Assessment and Study Center of 3-Rare Mineral Resources,Kunming 65003)

机构地区：[1]云南省三稀矿产资源勘查评价工程研究中心,云南昆明650032

出　　处：《云南地质》2018年第2期150-155,共6页Yunnan Geology

基　　金：2017年云南省高新技术产业发展项目计划(编号:201704)

摘　　要：云南建水县长岭岗碱性侵入岩体由碱长正长岩、霞石正长岩(广义的)构成。其中霞石正长岩(广义的)可进一步划分为黑云霞石正长岩、霓辉霞石正长岩、黑榴霞石正长岩和霞石正长岩。岩石属过碱性岩石,轻稀土富集,具负铕异常和负铈异常。该碱性侵入岩形成于板块内部环境的可能性较大,可能是在地幔底辟的作用下由地壳下部物质重熔形成。Changlinggang intrusion in Jianshui, Yunnan is composed of kalifeldspar syenite, nepheline syenite（ in broad sense）. The nepheline syenite（ in broad sense） can be further divided into biotite nepheline syenite,aegerine-augite nepheline syenite,melanite nepheline syenite and nepheline syenite. The rock belongs to the peralkalic one,rich in LREE,with-Eu anomaly and-Ce anomaly. This alkali intrusion is probably formed in the inner part of a plate,which maybe formed by the refusion of lower crust under mantle diapire.

关 键 词：碱性侵入岩 板块构造 底辟作用 重熔岩浆 云南建水长岭岗 

分 类 号：P588.121[天文地球—岩石学]