中文摘要：

浙江北部地区位于扬子及华夏两大板块相交接的江绍断裂带的北段,出露的新元古代花岗岩有石角、平水、桃红和西裘等岩体,年龄位于814Ma~932Ma之间。本文获得的该时期含白云母花岗岩锆石LA-ICP-MS U-Pb年龄为960.1Ma±6.5Ma,为新元古代早期岩浆活动产物。地球化学特征显示其SiO2质量分数普遍较高,变化于72.89%~74.82%、w（CaO）为0.24%~1.44%、全碱含量较高（7.46%~8.50%）且K2O质量分数普遍高于Na2O（w（Na2O）为2.08%~4.41%、w（K2O）为3.22%~6.00%之间）,A/CNK为0.98~1.34,为偏铝质到过铝质系列;富集K,Rb,Ba等大离子亲石元素（LILE）和轻稀土元素（LREE/HREE=12.02~16.10）,轻重稀土分馏明显（（La/Yb）N=11.02~24.16）,具中等至弱的Eu负异常（δEu=0.21~0.85）,而Nb,Ta,Ti等高场强元素（HFSE）则相对亏损。以上特征均表明浙北绍兴地区新元古代早期花岗岩类可能源于过铝质熔体,局部富集白云母晶簇的岩相学特征也表明岩石类型类似于富云母的过铝质花岗岩类（CPG）,物质来源可能为富云母的变泥质沉积岩的部分熔融,形成环境更可能为同碰撞及后碰撞环境,与陆壳碰撞加厚导致的剪切重熔有关。

英文摘要：

The northern part of Zhejiang Province is located in the north section of Jiang-Shao fault zone which between the Yangtze and Cathaysian plates. There are some Neoproterozoic granitoid plutons such as Shijiao, Pingshui,Taohong and Xiqiu, whose dating are between 814 Ma ~932 Ma. In this paper,dating age of 960. 1 Ma± 6.5 Ma for muscovite granite is obtained, im- plying that they were the products for early Neoproterozoic magmatic activity. For all samples, SiO2 content varies between 72.89% and 74.82% ,CaO content between 0~ 24% and 1.44%~＇~high total alkali content （7.46%~8. 50%）,and KzO content is generally higher than that of NazO （w （Na20） is 2.08%~4.41% and w（K2O） is between 3.22% and 6.00%）. The A/CNK values vary between 0.98 and 1.34, suggesting that the granites are metaluminous to peraluminous series. Chondrite-normalized REE patterns are characterized by LREE enrichment （LREE/HREE = 12.02~16.10） and REE fractionation significantly （La/Yb）N=11.02~24.16） with negative Eu. anomalies （0.21 ~0.85）. In the primitive-normalized spidergrams,rocks are enriched in LILEs （e g K, Rb,Ba） and show HFSEs （e g Nb,Ta,Ti） depletion. It is considered that the early Neoproterozoic granitoids may be originated from peraluminous magma, and the petrographic characteristics of white mica vug enrichment in local area suggest that the granitoids are similar to the peraluminous granites（CPG）,the material source may be originated from the partial melting of argillaceous sedimentary rocks. Based on the tectonic development of the region, and its tectonic,petro- logical and geochemical characteristics, the Neoproterozoic granitoids in northern Zhejiang Province have been generated in syn-collisional and post-collisional setting which closely related to the thrust-shearing anatexis caused by crustal thickening.