中文摘要：

安徽繁昌-铜陵地区属于长江中下游铁、铜、钼、金成矿带的一部分，中生代侵入岩中广泛发育黑云母。选取该区有代表性的3个岩体——板石岭黑云母石英二长岩、凤凰山花岗闪长岩、沙滩脚花岗闪长岩的黑云母单矿物样品，对其进行了电子探针成分分析、I-CP稀土元素成分分析、穆斯鲍尔谱特征分析研究。本区黑云母以三八面体类型为主，属镁质黑云母，黑云母的镁质率为0．62—0．71，表明岩体属于深源系列；铜陵2个岩体黑云母的SiO2、TiO2．Na2O含量较繁昌板石岭黑云母石英二长岩的要低，而TFeO较高。穆斯鲍尔谱表明黑云母的Fe^3＋／（Fe^2＋Fe^3＋）值为0．346—0．385，计算得到凤凰山花岗闪长岩的氧逸度f（O2）值为10^-5.5Pa；黑云母的氧化物成分和稀土元素成分表明3个侵入体均属壳-幔混源型，但铜陵两个形成时代较早的花岗闪长岩体的幔源岩浆成分要明显多于形成时代较晚的繁昌岩体的。

英文摘要：

Biotites occur in Mesozoic magmatic intrusions in the Fanchang-Tongling area, which is a segment of the iron, copper, molybdenum and gold metallogenic belt in the Middle and Lower Reaches of the Yangtze River. Biotite samples were collected from the Banshiling biotite-quartz-monzonite intrusion in the Fanchang, Fenghuangshan and Shatanjiao granodiorite intrusions in Tongling, the former is younger than the latter, as evidenced by SHRIMP dating. Based on the REE and major element analyses of biotites using ICP-MS, electron-probe analyses and Moessbauer spectra for the samples, the results showed that biotites are mostly tri-octahedral, and all belong to Mg-biotites. The contents of SiO2, TiO2 and Na2O in biotites in the Tongling intrusions are lower than those in the Fanchang instmsion, but TFeO is higher than that in the Fanchang intrusion. The ratios of Mg/（Mg ＋ Fe^2＋ ＋ Mn） are 0.62 - 0.71, indicating the rocks belong to deep-source series. Fe^3＋/（Fe^2＋ ＋ Fe^3＋ ） ratios measured by M＇6ssbauer spectroscopy are 0.346-0.385, calculated oxygen fugacity of the Fenghuangshan granodiorite is 10^-5.5 Pa. The oxide and REE compositions of biotites, in combination with the initial ^87Sr/^86Sr ratios of the rocks, show these intrusions stemmed from a mixed source of mantle and crust, but the components of mantle-derived magma in the Tongling intrusive rocks are more than those in the Fanchang intrusive rock.