| 黄克杰.山西塔儿山地区夕卡岩型铁矿的赋矿围岩特征及控矿作用[J].地质找矿论丛,2015,30(3):344-351 |
| 山西塔儿山地区夕卡岩型铁矿的赋矿围岩特征及控矿作用 |
| Characteristics of the host rock of the skarn type Fe deposits at Ta'ershan area in Shanxi province and its control on the iron ore |
| 投稿时间：2015-03-13 修订日期：2015-08-29 |
| DOI：10.6053/j.issn.1001-1412.2015.03.005 |
| 中文关键词: 塔儿山地区铁矿 夕卡岩型矿床 富镁碳酸盐岩 含石膏碳酸盐岩 控矿作用 晋南 |
| 英文关键词:Fe deposits at Ta'ershan area skarn type Fe deposit Mg-rich carbonate rock the gypsum-bearing layer the ore-control factor The south Shanxi province |
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| 中文摘要: |
| 山西塔儿山地区的夕卡岩型铁矿是山西省的重要铁矿类型。夕卡岩型铁矿的赋矿围岩以中奥陶统碳酸盐岩为主,分为下马家沟组、上马家沟组和峰峰组,共3个组7个岩性段。该区中奥陶统的特点是白云质成分较高,较纯的灰岩较少,表现为潮上潟湖相、潮上盐坪相和潮下陆棚相交替的沉积环境;岩石富MgO,大部分碳酸盐岩的CaO/MgO值为2.63~5.51,属于方解质白云岩或富白云质灰岩;在热液交代作用过程中,白云质灰岩、钙质白云岩经热液交代形成了镁夕卡岩岩石组合,以透辉石-金云母夕卡岩、透辉石夕卡岩和金云母夕卡岩为主,铁矿体主要产于镁质夕卡岩中。中奥陶统碳酸盐岩的控矿作用表现为:大部分的铁矿体都产于由富镁碳酸盐岩蚀变而成的镁夕卡岩中,围岩中的镁质可以降低岩浆温度和黏度,转换硅酸盐中的铁质,形成镁质夕卡岩和铁质堆积;含石膏层的碳酸盐岩在成矿中具有关键性作用,不仅能够改善岩浆和流体的物理-化学性状,促进蚀变和矿化,还能提供有利的成矿空间,成为构成夕卡岩型铁矿矿集区的决定性因素之一。 |
| 英文摘要: |
| The skarn Fe deposit at Ta'ershan area is the main type of Fe deposit in Shanxi province. The host rock of the deposit is dominated by the Middle Ordovician carbonate rock which is composed of 7 members belonging to Lower Majiagou formation, Upper Majiagou formation and Fengfeng formation respectively. Compositionally, carbonate rock in the area is more dolomitic materials and less pure carbonate reflecting alternating upper tidal lagoon, upper tidal salt flat and lower tidal continental shelf sedimentary facies. Most of the carbonate rock is rich in MgO with CaO/MgO=2.63-5.51 belonging to calcite dolomite or dolomitic material-rich limestone. During hydrothermal metasomatism dolomitic limestone, cal-dolomite turned to Mg-skarn rock series dominated by diopside-flogopite skarn, diopside skarn and flogopite skarn. The Fe ore bodies occur in the Mg-skarn. The Middle Ordovician carbonate rock control on the Fe ore is characterized by occurrence of the most Fe deposits in the Mg-skarn altering from the Mg-rich carbonate rock. Magnesium in the host rock tends to reduce temperature and viscosity of the magma and transfers Fe from silicates resulting in formation Mg-skarn and accumulation of Fe. The gypsum-bearing layer is important. It dose not only improve physiochemical behavior of the magma and hydrothermal fluid for promotion of alteration and mineralization but also provides space for ore body thus is one of the key factors for the skarn type Fe deposits-clustered area. |
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