| 郭少丰.再论甘肃镜铁山铁矿成因[J].地质与勘探,2014,50(5):864-873 |
| 再论甘肃镜铁山铁矿成因 |
| A further discussion on the genesis of the Jingtieshan iron ore deposit, Gansu Province |
| 投稿时间：2014-02-20 修订日期：2014-06-20 |
| DOI： |
| 中文关键词: 镜铁山 铁矿 沉积矿产 热液变质铁矿 |
| 英文关键词: Jingtieshan, ferrous deposit, deposition mineral, hydrothermal metamorphic deposit |
| 基金项目:国土资源部公益性行业科研专项经费项目（编号200911007-16）资助 |
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| 中文摘要: |
| 甘肃“镜铁山”铁矿位于北祁连山加里东褶皱带西段，因铁矿规模大、类型特殊，并同时赋存一个中型铜矿而倍受关注。有关矿床成因各家意见不一，有“火山热液沉积”说，“变质沉积”说，“海底喷气沉积”说，“Sedex型”等，但均认为铁矿属沉积矿产。笔者近期在野外工作期间，在与成矿关系密切的黑色千枚岩中发现了钙质千枚岩捕掳体，证明黑色千枚岩为火成岩，所采矿石、围岩样品的地球化学性质也显示出火成岩特征，因局部地段黑色千枚岩与铁矿成过渡关系，并结合前人所测成矿温度在280℃至340℃之间等证据，综合分析认为镜铁山铁矿可能不是沉积成因，而是与中、基性岩有关的热液变质铁矿。 |
| 英文摘要: |
| The Jingtieshan iron deposit is located in the western part of the North Qilian Caledonian fold belt, and has attracted much attention among geologists for its large scale, special deposit type and hosting a medium-scale copper deposit. The genesis of the deposit has been interpreted by several available models, including volcanic hydrothermal deposition theory, metasedimentary theory, submarine exhalative deposition theory and Sedex type, but a common belief is that it is a sedimentary deposit. However, the calcic phyllite xenoliths in black phyllite associated with mineralization was discovered in the field, indicating that the protolith of the black phyllite is igneous rock. Geochemical data of ores and wall rocks from the deposit also shows the same characteristics of igneous rocks. Because of gradational contacts locally exposed between black phyllites and iron orebodies, and the mineralization temperatures of the deposit (280 to 340℃;measured in previous research), it is proposed that the Jingtieshan iron deposit may not be a sedimentary one, but a hydrothermal metamorphic iron deposit associated with intermediate and basic rocks. |
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