中文摘要：

宁芜盆地是长江中下游成矿带中的重要矿集区,磷灰石是该区各矿床中的标志性矿物。本文以宁芜玢岩铁矿典型代表的陶村铁矿床为研究对象,利用激光剥蚀电感耦合等离子体质谱（LA-ICP-MS）微区分析新技术和电子探针分析对该矿床中辉石闪长玢岩中的磷灰石（Ap-I）、浸染状磁铁矿矿石中的磷灰石（Ap-D）和脉状磁铁矿矿石中的磷灰石（Ap-V）进行了微量元素和主量元素成分分析。其结果表明辉石闪长玢岩中的磷灰石（Ap-I）和两种类型矿石中磷灰石（Ap-D和Ap-V）的主要元素成分变化范围都很小,均为氟磷灰石,并含有少量的S和Cl。其中Ap-I含有较高的Na、Mg、Si、V、Mn、Fe、Ga、Ge、Sr、Y、Zr、Ba、REE、Pb、Th和U。Ap-D中除了含有较高的Na、Mg、Si、V、Mn、Fe、Ga、Ge、Sr、Y、Zr、Ba、REE、Pb、Th和U之外,还含有Al、Sc、Cr、Ni和Cu。Ap-V与Ap-D不同的是Al、Sc、Cr、Ni和Cu的含量较低,只有少数分析点值高于仪器的检测限。岩浆岩中的磷灰石（Ap-I）和两种类型矿石中磷灰石（Ap-D和Ap-V）中Zr、Y、Lu、Yb、Mn和δEu之间的演变关系以及稀土元素分配形式表明陶村铁矿床的成矿热液来源于辉石闪长玢岩,从浸染状矿化到脉状矿化,成矿热液的氧逸度升高,成矿热液中的Y,REE等微量元素的含量降低。陶村铁矿床为与辉石闪长玢岩密切相关的岩浆热液型矿床。将陶村铁矿床矿石中磷灰石（Ap-D和Ap-V）的F、Cl、S、REE组成与Kiruna型矿床和IOCG型矿床的同类成分进行对比发现,他们之间存在明显差异,表明以陶村铁矿床为代表的宁芜玢岩型铁矿床既不属于Kiruna型矿床,也不属于IOCG型矿床。

英文摘要：

Ningwu volcanic basin is one of the important deposit-intensive areas along the Middle-Lower Reaches of Yangtze River metallogenic belt.Apatite is one of the key diagnostic minerals for a variety of deposits in this area.Taking the Taocun iron deposit,one of representative porphyrite irons in Ningwu basin,as an example,this study examined trace elements and major elements compositions of the apatites （Ap-I,Ap-D,Ap-V） from pyroxene diorite porphyrite,disseminated magnetite ores and using electron microprobe and LA-ICP-MS methods.The results show that the apatite （Ap-I） from pyroxene diorite porphyrite and apatites （Ap-D and Ap-V） changes within a small range in compositions,suggesting they are fluorapatite with minor S and Cl.But the apatite （Ap-I） contains higher contents of Na,Mg,Si,V,Mn,Fe,Ga,Ge,Sr,Y,Zr,Ba,REE,Pb,Th,and U.Other than higher Na,Mg,Si,V,Mn,Fe,Ga,Ge,Sr,Y,Zr,Ba,REE,Pb,Th,and U,the apatite （Ap-D） also contains Al,Sc,Cr,Ni,and Cu.Only difference between Ap-V and Ap-D is that the apatite （Ap-D） contains lower Al,Sc,Cr,Ni,and Cu,with a few values higher than instrumental limit.The evolution relationships between Zr,Y,Lu,Yb,Mn,andδEu,and the REE distribution pattern in the apatites （Ap-I,and Ap-D and Ap-V ） from magmatic rocks and two kinds of ores indicate that the ore-forming fluids may derive from pyroxene diorite porphyrite,and oxygen fugacity of the ore-forming fluids increased from disseminated mineralization to vein mineralization but contents of Y and REEs in the fluids decreased.The Taocun iron deposit is a magmatic hydrothermal deposit closely related to diorite porphyrite.Compared with the Kiruna-type deposit and IOCG deposits,the Taocun iron deposit shows distinct differences in the geochemical compositions of the apatites,indicating that the Ningwu porphyrite iron deposit,which is represented by the Taocun iron deposit,belongs neither to the Kiruna type deposits nor to the IOCG type deposit.