中文摘要：

姚家岭特大型Cu-Pb-Zn多金属矿床的发现,是铜陵地区近年来找矿勘探上的一项重大突破,成矿母岩为姚家岭岩体.然而,目前对该岩体的形成年龄和岩石成因尚无系统研究.本次工作表明岩体的锆石LA-ICPMS定年结果指示其形成年龄为140.7±177;1.3 Ma,处于长江中下游地区中生代岩浆活动3个阶段中的第一阶段;姚家岭岩体具有富集的Sr-Nd同位素组成和类似大陆岛弧的微量元素特征,和铜陵地区其它中生代侵入岩体是一致的,成岩岩浆由被俯冲板片流体/熔体交代的富集岩石圈地幔和太古代下地壳分别部分熔融产生的岩浆混合形成,并经历了角闪石和榍石等矿物的结晶分异.岩石的形成处在本地区由挤压转为拉张的过渡时期.

英文摘要：

Discovery of the Yaojialing super-large Cu-Pb-Zn polymetallic ore deposit was a major breakthrough in recent prospecting exploration history of Tongling area. The ore-forming parent rock was Yaojialing intrusion. However, there is no systematic study for its age and petrogenesis. Our work shows that the formation age of the Yaojialing intrusion is 140.7 ± 1.3 Ma,belonging to the first-stage of the three stages of the Late Mesozoic magmatisms in the Middle and Lower Yangtze River Belt. Yaojialing intrusion has characteristics of enriched Sr-Nd isotopes and continental arc-like trace element patterns, which are consistent with other Mesozoic intrusions in Tongling area. This magmaitc rock was most likely formed by magma mixing derived from an enriched mantle source metasomatised in subduction processes and the Archean LCC, respectively. Magma mixture underwent fractional crystallisation of hornblende and titanite. The magmatic rocks of the first-stage were formed under a transition petrotectonic setting from extrusion to extension.