福建建宁中元古代上坪超单元的建立及其特征  

Establishment and Characteristics of the Middle Proterozoic Shangping Superunit in Fujian Province

作　　者：陈觉民[1] 徐维光[1] 

机构地区：[1]福建省区域地质调查队

出　　处：《福建地质》1992年第4期231-240,共10页Geology of Fujian

摘　　要：位于闽赣交界处武夷山脉中段的建宁县,中元古代上坪超单元属于岛弧区幔源分异型钙-钙碱性岩浆序列。它以较深侵位的岩浆底辟作用形成于板块碰撞前,侵位后与围岩上太古界天井坪组韵区域变质、混合岩化、构造形变以及退变均为同步发展。它是福建目前已知最古老的变质侵入岩,距今1714±20Ma。The Shangping Superunit of middle Proterozoic, located in the middle segment of Wuyi Mountains near the boundary between Fujian and Jiangxi Provinces, belongs to the calc-calcic-alkaline magmatic series of mantle-derived and differentiated type in the island-arc province. It forms before the collision of plates as a magmatic diapirism of deeper emplacement and has a contemporaneous development with the adjacent rocks of Tianjingping Formation (upper Archean)in the aspect of regional metamorphism, migmatization, structural deformation and retrograde metamorphism. It is the oldest metamorphic intrusive rocks in Fujian Province with an age of 1714±20Ma.

关 键 词：中元古代 岩浆 超单元 构造形变 碱性岩 板块碰撞 岛弧 福建 建宁县 分异 

分 类 号：P588[天文地球—岩石学] P618[天文地球—地质学]