鲁西地区新太古代早期的岩浆活动——泰山岩套英云闪长质片麻岩锆石SHRIMP UPb年龄的证据

Magmatism in Early Period of Neoarchean in Western Shandong Province——Zircon SHRIMP U-Pb Age Evidence of Tonalite Gneiss in Taishan Rock Suite

摘要:

泰山岩套主要岩性为英云闪长质片麻岩和条带状英云闪长质片麻岩，出露于鲁西地区泰山—化马湾—蒙山一带。根据新测的锆石SHRIMP UPb年龄结果，其岩浆结晶年龄2729~2700Ma，变质年龄2600Ma，其形成时代确定为新太古代早期。该岩套组成古老陆核，是地幔岩浆侵入混入地壳物质形成的。

Abstract:

Main lithology of Taishan rock suite is tonalitic gneiss and banded tonalite gneiss. It outcropped in Taishan—Huamawan—Mengshan area in western Shandong province. According to new measuring results of zircon SHRIMP UPb age, its magma crystallization age is 2729~2700Ma, metamorphic age is 2600Ma, and the formation age is identified as early period of Neo-archean. Ancient continental nucleus were formed by the rock suite which was formed by mantle magma intrusion mixed with crustal materials.