陕南勉略宁地区铜厂矿区的钠长岩

THE ALBITITE IN TONGCHANG ORE AREA IN THE SOUTH OF SHANXI PROVINCE

本文通过岩石学、稀土元素地球化学及Ｒｂ－Ｓｒ同位素年代学等研究，认为铜厂矿区内所分布的钠长岩形成时代为海西早期（３４８．３７Ｍａ±８．４７Ｍａ），由于海西早期闪长岩（３４０．６０Ｍａ±１０．３９Ｍａ）的侵入，带来了气液和热，使周围郭家沟组细碧岩中的部分Ｎａ质析出，并交代与之接触的闪长岩而形成钠长岩。

By the study of petrology,REE geochemistry and RbSr isotopic age,the formingage of the albitite in the South of Shanxi area was in Hercynian(348.37 Ma±8.47 Ma).At that time,some Na of the spilit were broughten out and replaced some diorite to albitite by the gas,liquid and thermal caused by the intrusion of diorite(340.06 Ma±10.93 Ma).