摘要
在福建建阳麻沙镇北和恩娘岭一带原古元古代大金山岩组片麻岩中发现存在新元古代和中元古代岩体信息,岩石具有高硅,中铝,低钙、镁、铁、磷,富集大离子亲石元素Rb、K,亏损高场强元素Nb、Ti,亏损Sr、P等特征;麻沙镇北片麻岩LA-ICP-MS锆石U-Pb同位素测年获得原岩年龄为(908±7.5)Ma,恩娘岭片麻岩原岩年龄为(1 357±17)Ma,这一发现可为福建地区乃至东南沿海地区地质构造演化研究提供新信息.
Abstract
Neoproterozoic and mesoproterozoic rock mass information has been found in the gneiss of the Proterozoic Dajinshan Formation in the north of Masha Town and Enniangling area,Jianyang city,Fujian Province.Its rock geochemistry is characterized by high silicon,medium aluminum,low calcium,magnesium,iron,phosphorus,etc.enriched with large ion lithophile elements Rb,K,Ba,and depleted with high field strength elements Nb,Ti;Loss Sr,P.Isotopic dating of Gneiss in the north of Masha Town shows that the protolith age is(908±7.5)Ma,and the protolith age of Enniangling Gneiss is(1 357±17)Ma.This discovery can provide evidence information for the study of geological structure evolution in Fujian and even in the southeast coastal area.
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