【摘 要】
：
利用单颗粒锆石Ｕ－Ｐｂ法分别测定了桐庐和相山火山－侵入杂岩中早期及晚期形成的岩石单元的结晶年龄，桐庐杂岩体中早期火山岩的喷发年龄为１３４．９Ｍａ，晚期浅成岩的结晶年龄为１３４．４Ｍａ，杂岩体基本上属于同时
【机 构】
：
南京大学成矿作用国家重点实验室,中国地质科学院天津地质矿产研究所
论文部分内容阅读
利用单颗粒锆石Ｕ－Ｐｂ法分别测定了桐庐和相山火山－侵入杂岩中早期及晚期形成的岩石单元的结晶年龄，桐庐杂岩体中早期火山岩的喷发年龄为１３４．９Ｍａ，晚期浅成岩的结晶年龄为１３４．４Ｍａ，杂岩体基本上属于同时形成，为早白垩世岩浆活动的产物；相山杂岩体中第二阶段岩石的结晶年龄为１４０．３Ｍａ，最晚阶段超浅成岩的结晶年龄为１３５．４Ｍａ，杂岩体各单元的形成时间相近，为晚侏罗世末期岩浆活动的产物。可见利用单颗粒锆石Ｕ－Ｐｂ年龄能非常有效地讨论一套岩石组合是否是同时间形成的，而这正是火山－侵入杂岩研究的重要内容之一。
The single grain zircon U-Pb method was used to determine the crystallization age of early and late rock units in Tonglu and Xiangshan volcano-intrusive complex, respectively. The eruption age of early volcanic rocks in Tonglu complex was 134.9Ma, The crystallization age of diagenesis is 134.4Ma. The complex bodies are basically formed at the same time and are the product of the Early Cretaceous magmatism. The crystallization age of the second stage rock in Xiangshan Complex is 140.3Ma, the latest stage ultra-shallow The crystallization age of diagenesis is 135.4Ma, and the formation time of each unit in the complex is similar, which is the product of magmatic activity in the late Late Jurassic. It can be seen that the use of single-particle zircon U-Pb age can be very effective to discuss whether a set of rock assemblages formed in time, which is one of the important contents of volcanic-intrusive complex.
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