高压白云母中过剩氩的成因研究进展

Major Advances in the Research on the Genesis of Excess Argon in High Pressure Muscovite

高压白云母中过剩氩成因研究目前已经取得了如下进展:①已经将高压白云母中过剩氩的来源限定为由流体输送和由母岩继承两种;②高压白云母中过剩氩的赋存和矿物的Mg/(Fe+Mg)比值、Si4+含量及矿物的显微结构有关;③初步认定高压白云母中过剩氩的赋存和岩性有关:榴辉岩中的白云母含过剩氩最多,高压副片麻岩中白云母仍含有少量过剩氩,高压正片麻岩中白云母不含过剩氩。

Recent achievements in researches on the genesis of excess argon in high pressure muscovite are summarized as follows.① Excess argon in high pressure muscovite comes from its country rock, derived either from fluid transportation or from inheritance. ② Excess argon in high pressure muscovite is related to the ratio of Mg/（Fe ＋ Mg）, Si^4＋ content and microstructure of minerals. ③ the high pressure muscovite in eclogite contains large amounts of excess argon, that in high pressure paragneiss contains small amounts of excess argon, and that in high pressure orthogneiss contains no excess argon.