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| 宁芜盆地凹山和东山铁矿床中阳起石的激光39Ar-40Ar年代学研究 | |
| 引用本文： | 马芳,蒋少涌,薛怀民.宁芜盆地凹山和东山铁矿床中阳起石的激光39Ar-40Ar年代学研究[J].矿床地质,2010,29(2):283-289. |
| 作者姓名： | 马芳 蒋少涌 薛怀民 |
| 作者单位： | 1. 北京大学地球与空间科学学院教育部造山带与地壳演化重点实验室,北京,100871 2. 南京大学地球科学系成矿作用国家重点实验室,江苏,南京,210093 3. 中国地质科学院地质研究所,北京,100037 |
| 基金项目： | 国家自然科学基金(40503006);;中国地质调查局项目(1212010711814)的联合资助 |
| 摘 要： | 文章通过对凹山和东山铁矿床中特征的组合矿物之一伟晶状阳起石进行激光39Ar-40Ar法定年,精确测定了玢岩铁矿的成矿时代。其中东山铁矿中新鲜阳起石(黑绿色)的39Ar-40Ar等时线年龄在126～129Ma之间,与赋矿围岩大王山组火山岩中角闪石的等时线年龄(127Ma)一致,证明成矿与成岩密切相关,成矿与成岩是同时期的产物。而凹山铁矿中蚀变阳起石(灰绿色)的39Ar-40Ar等时线年龄为(114±16)Ma。2种阳起石分别形成于成矿作用的不同阶段,黑绿色新鲜阳起石与磷灰石、磁铁矿同期形成,形成于岩浆向热液演化的高温阶段,在成岩和成矿之后的冷却过程中,矿体和潜火山岩体具有相同的闪石封闭温度(500℃±);而灰绿色蚀变阳起石形成于中期阳起石(透辉石)-钠长石-磷灰石-磁铁矿化矿体围岩蚀变阶段。 |
| 关 键 词： | 地球化学 阳起石 激光39Ar-40Ar定年 玢岩铁矿 宁芜盆地 |
Early Cretaceous mineralizations in Ningwu basin: Insight from actinolite 39Ar-40Ar laser dating results |
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| MA Fang,JIANG ShaoYong,XUE HuaiMin.Early Cretaceous mineralizations in Ningwu basin: Insight from actinolite 39Ar-40Ar laser dating results[J].Mineral Deposits,2010,29(2):283-289. | |
| Authors: | MA Fang JIANG ShaoYong XUE HuaiMin |
| Institution: | 1 Key Laboratory of Orogenic Belts and Crustal Evolution/a>;Ministry of Education/a>;School of Earth and Space Sciences/a>;Peking University/a>;Beijing 100871/a>;China/a>;2 State Key Laboratory for Mineral Deposits Research/a>;Department of Earth Sciences/a>;Nanjing University/a>;Nanjing 210093/a>;Jiangsu/a>;3 Institute of Geology/a>;Chinese Academy of Geological Sciences/a>;Beijing 100037/a>;China |
| Abstract: | Actinolite 39Ar-40Ar laser fusion technique was employed to determine the metallogenic epochs of the Ningwu porphyrite iron deposits. The 39Ar-40Ar isochron ages of the fresh actinolite (dark green) from the Dongshan iron deposit are from 126 to 129 Ma, which agree with the 39Ar-40Ar isochron age (127 Ma) of hornblende from the host volcanic rock of Dawangshan Group within the analytical errors, indicating that iron mineralization was associated with the Dawangshan Group volcanic rocks. The 39Ar-40Ar spectr... |
| Keywords: | geochemistry actinolite 39Ar-40Ar laser dating prophyrite iron deposit Ningwu basin |
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