金红石高-超高压变质成矿作用的几个问题

SOME QUESTIONS OF HIGH-PRESSURE AND SUPER HIGH PRESSURE METAMORPHIC ORE FORMATION OF RUTILE

通过岩石及矿物晶体化学特征的计算,试图解决“为什么高-超高压变质作用利于金红石形成”的三方面内容:在高-超高压变质基性岩中,金红石普遍出现(即使在岩石全钛含量很低情况下)、基本不出现(或很少出现)钛铁矿、榍石、磁铁矿及赤铁矿等非金红石钛矿物及铁质矿物;石榴石和绿辉石“分流”的钛是极其有限的;以及从低压到高压,形成金红石粒度有逐渐变粗的趋势等问题。

In this article,by the caulating of chencical character of rnineral crystal and rocks,its trying to find three aspects of “Why its make for the formation of rutile under high-superhigh,pressure meta morphism”In the high-superhigh pressure nletabusite,it occures generally of rustile(there are less contents of total titanium in rocks)but hardly exist(or few exist)of non-rutile ncineral and ferruginous mineral dike ilmenite.Spinelline, magnetite and hematite and so on,The content of titanium in garnet and omphacite is limited,With the pressule from lower to higher,the grain size of rutile formatted tend to increase gradually.