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河桥岩体地理上属于浙江省临安市境内,距临安约65 km。位于全国主要的萤石矿矿集区“赣北-皖南-浙西北萤石矿矿集区”(王吉平等,2010)。大地构造属扬子板块下扬子陆块的东南部,江南元古代造山带的北东端,夹持于江南断裂带与富春江断裂带之间,南东侧以钦杭断裂带与华南板块相邻。河桥岩体主要中细粒二长花岗岩、中粗粒二长花岗岩组成,在岩体内部及与周围地层中发育有大量的萤石矿床或矿化点。岩石锆石LA-ICP-MSU-Pb分析显示,河桥岩体成岩时代为149±6 Ma,形成于晚侏
River bridge rock geographically belongs to the territory of Lin’an City, Zhejiang Province, about 65 km from Lin’an. Located in the country’s major fluorite ore district “North Jiangxi - Wannan - Zhejiang North Fluorite Mine Area ” (Wang Jiping et al., 2010). The earth structure belongs to the southeastern part of the Yangtze block of the Yangtze Plate and the northeast end of the Jiangnan Paleozoic orogenic belt. It is sandwiched between the Jiangnan fault zone and the Fuchunjiang fault zone, and is adjacent to the South China plate by the Qinhang-Hetian fault zone . The river bridge rock mass mainly consists of fine-grained monzogranite and medium-coarse-grained granite, and a large number of fluorite deposits or mineralization sites are developed in and around the rock mass. Rock zircon LA-ICP-MSU-Pb analysis shows that the river bridge rock diagenetic age is 149 ± 6 Ma, formed in the late juvenile