福建晚侏罗世两条性质不同的巨型火山岩带

Two Large-scale Zones of Late Jurassic Volcanic Rock in Fujain Province

晚侏罗世为福建火山活动的鼎盛时期 ,形成两条巨型火山岩带 ,即沿海带和仙霞岭带。据其产出的构造环境、火山活动特点和岩石学、地球化学等特征 ,推测沿海带火山岩与太平洋板块向北西消减作用有关 ,为陆缘造山带壳幔混合源岩浆之产物 ;仙霞岭带则与江山—绍兴对接带中段复活活动有关 ,可视为陆 -陆碰撞造山带壳源重熔岩浆演化的产物。

The volcanic activities during Late Jurassic are prosperous in the surveyed area, forming two large scale volcanic rock zones -the Coastal Zone and the Xianxialing Zone. According to the tectonic setting, features of volcanic activities and the characteristics of petrology and geochemistry, it is referred in the paper that the formation of the volcanic rocks in the Coastal Zone is related to the northwestward consumption of the Pacific Plate, which are derived from the crust mantle migma in the marginal orogenic belt, and that the formation of the volcanic rocks in the Xianxialing Zone has a relation with the reactivation of the middle segment of the Jiangshan Shaoxing Faulted Belt, which can be regarded as the evolutionary products of remelting magma from the orogenic belt formed by the collision of two continents.