麻江隆昌地区金云火山岩含金刚石性浅析

Initial Remarks on Diamond-bearing Potential of the Lamproites in Longchang, Majiang County, Guizhou Province

麻江隆昌金云火山岩（下称岩体）的基本化学组分、微量元素含量及岩石稀土元素富集程度、分馏特征等方面与一般金云火山岩（钾镁煌斑岩）、金伯利岩有相似之处，但却存在本质区别。岩体中铬尖晶石的主元素二元相关图与超基性角砾岩或超基性煌斑岩相同，说明岩体岩石属性既不是金伯利岩，也不是典型的金云火山岩、岩石中缺乏与金刚石共生的Ｓ１、Ｓ２组铬尖晶石，因此岩体应属含金刚石性差或不含金刚石的金云火山岩。

The lithosomes found in Longchang, Majing County in recent yaers are similar in general to Lamproites or kimberlites in lithochemistry, but there are some essential distinction in the characters of chrome spinels from them. According to the similarity of binary correlograms of main elements of chrome spinels from the lithosomes to ultra-lamprophyre, it is suggested that these lithosomes are neither kimberlite nor typical lamproite. Because of lack of spinel-S1 and-S2 combined with diamood. the author concludes that there are few or no diamond in the lithosomes in Lochang, Majiang County.