ZHANGZHOU GRANITES

摘要

The Zhangzhou granite batholith is a composite massif in the southern part of the late Yanshanian (Cretaceous) volcanic-plutonic complex in Fujian Province. It is situated on the continental margin of southeast China near the Taiwan Strait and located at the intersection of NE and EW fractures within the Zhejiang and Fujian tectono-magmatic belt. The batholith is characterized by its large size (900 km~2), multi-stage and multi-period (2 stages, 7 periods) and complexity in compositions (basic to acidic and co-existence of I-and A-type granites). There are two stages of intrusion. The rocks of the early stage are I-type granites of early Cretaceous (123.2-100.8 Ma) ages. They are subdivided into four periods of intrusions: gabbronorite (1 km~2), quartz-monzonite (128 km~2), granodiorite(501 km~2) and rapakivi-adamellite (138 km~2). The rocks of the late stage are A-type granites of late Cretaceous (97.1 Ma) ages. There are 3 periods of intrusions: fine-grained potassic granite (24.4 km~2), drusy cavity bearing alkaline granite (79.2 km~2) and nordmarkite granophyre (5.2 km~2).