| 富铝型豆荚状铬铁矿床的成矿模式 |
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| 引用本文：鲍佩声,王希斌.1997.富铝型豆荚状铬铁矿床的成矿模式[J].地球学报,18(1):25-40. |
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| 基金项目:地质矿产部“八五”基础课题项目 |
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| 中文摘要:富铝型豆荚状铬铁矿床系指产于ＰＴＧ系列蛇绿岩套地幔橄榄岩中的矿石，以富铝（Ａｌ２Ｏ３＞２０％）、低铬（Ｃｒ２Ｏ３＜４５％）为特征的铬铁矿床。该类型矿床以萨尔托海、贺根山及洪古勒楞铬铁矿床为代表。含富铝型铬铁矿床的岩体以伴有丰富的基性分凝体、含长地幔橄榄岩的出现以及矿石四周发育绿泥石薄壳而区别于含富铬型铬铁矿床的岩体。作者的研究表明富铝型铬铁矿床是原始地幔岩不同程度部分熔融再造的产物。富铬矿浆代表高度部分熔融的最终残余。富铝型铬铁矿床的成矿模式有两种：一为原始地幔岩中低度部分熔融再造的产物，以缺失高熔杂岩带为特征，属中低熔再造成矿模式，以洪古勒楞矿床为代表；另一种为原始地幔岩高度熔融再造的产物，以发育高熔杂岩带为特征，基性熔体与富铬矿浆之间曾发生了再平衡作用，属高熔再造－再平衡成矿模式，以萨尔托海及贺根山矿床为代表。 |
| 中文关键词:富铝型豆荚状铬铁矿 成矿模式 部分熔融再造 再平衡 |
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| Metallogenic Models of the Aluminum Rich Podiform Chromite Deposits |
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| Abstract:The podiform chromite depoisit of Aluminum type is referred to an ore deposit occurring in mantle peridotite of ophiolite of PTG lineage and having an ore with Al 2O 3_high (>20%) and Cr 2O 3_low (>45%). The ophiolite of PTG lineage is mainly composed of Peridotite (P)-Troctonite(T)-Olivine gabbro (G). It is represented by the Sartuohai, Hongguleleng and Hegenshan chromite depopsits. The rock bodies with Al_rich deposits differ from those with Cr_rich chromite deposits by occurrence of abundant basic segregations associated with the rock bodies, of Pl_bearing mantle peridotites and thin crust of chlorite around the margin of Al_rich ores. The studies of the authors indicate that the Al rich chromites are products formed by varying degrees of melting and reformation of primary pyrolites. The ore magma of chromium rich is the final residue formed by high degree melting. There are two metallogenic models in mineralization of the Al rich chromite deposits. One is the product of moderate lower degree of melting and reformation of pyrolite. It is represented by the Hongguleleng chromite deposit characterized by absence of high melted complex belt. So, the mineralization of the Hongguleleng chromite deposit can be called moderate lower melting and reformation metallogenic model. The other is the products of high degree of melting and reformation of pyrolite. It's represented by the Sartuohai and deposit characterized by present of the high melted complex belts. The reequilibrium between the basic melt and Cr rich ore magma was happened in the mineralization of it. Therefore, the matllogenic model of the Sartuohai deposit can be called high melting and reformation_reequilibrium metallogenic model. |
| keywords:Al-rich podiform chromite metallogenic model melting and reformation reequilibrium |
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