摘要
本文讨论了上地幔部分熔融的岩石序列、蛇绿岩的两种成因机制、铬铁矿的向下沉陷作用、铬铁矿的富铝或富铬以及铬铁矿的特定赋存部位等问题。并在此基础上提出了关于蛇绿岩型铬铁岩的一个新的成因分类方案:a.上地幔部分熔融铬铁矿床;b.岩浆房结晶分异铬铁矿床;c.沉陷铬铁矿床。
Almost all of the occurrences of refractory chromite (high-aluminium) and metallurgical chromite (high-chromium) in the worldare related to ophiolites and are pertinently calied ophiolitic type chromites. The following problems of ophiolitic chromites are discussed:1. Rock sequences of upper mantle partial melting. 2. The two genetic mechanisms of ophiolites. 3. The process of chromite settlement. 4.Composition and spacial occurrences of chromite ores. A new genetic classification for ophiolitic type chromite is suggested:Ⅰ. Chromitedeposits from partial melting of upper mantle. Ⅱ. Chromite deposits from crystallization-differentiation in the pocket of magma. Ⅲ. De-posits of settled chromite.
关键词
蛇绿岩
铬铁矿
矿床成因
ophiolite
chromite
genetic classification
rock sequence
settlement
chromium-rich
aluminium-rich
occurrence
