济南—邹平地区侵入岩期次划分之我见

OPINIONS ON STAGE DIVISTON OF THE INSTRUSIVE ROCKS IN JINAN-ZOUPING AREA

摘要:

作者根据近年来的研究成果,对济南—邹平地区侵入岩的形成时代和期次关系进行了探讨,并提出以下重要观点: 1.根据已有的钾-氩年龄数据,尤其是根据钐-钕等时线年龄,并结合构造控制和侵入围岩等依据认为济南辉长岩体形成时间应是印支期或印支—燕山早期。将该区侵入岩分为印支—燕山早期和燕山晚期两期。并总结出两期岩浆活动的主要地质特征及其相互区别。 2.认为沙沟闪长岩体不是济南辉长岩体的边缘相,而是独立岩体,晚於济南辉长岩体侵入,是印支—燕山早期第二岩浆阶段的产物。 3.重新厘定了章丘—邹平地区侵入岩的期次顺序。认为王家庄石英二长岩体早于环状二长岩墙,是燕山晚期第二岩浆阶段最早形成的岩体。

Abstract:

The author probes into the formation age and stages of the intrusive rocks in the Jinan-Zoupin area and proposes the following points:1) In the light of the available K Ar age data, especially the Sm-Nd isochron ages, combined with evidence of structural control and intruded wall rocks, the Jinan gabbro body is considered to have formed at the Indo-Chinese stage or the Indo-Chinese to early Yanshanian stage. Intrusive rocks in the area are divided in terms of the two stages, i. e. those of the Indo Chinese ...