| 内蒙古羊蹄子山沉积变质型钛矿床——一个新的钛矿床类型的发现 |
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| 引用本文：赵一鸣， 李大新， 陈文明， 丰成友， 孙文泓.2006.Yangtizishan metamorphosed sedimentary titanium deposit: Discovery of new genetic type of titanium deposit [J].Mineral Deposits,25(2):113~122 |
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| 基金项目:内蒙古自治区地勘项目（2005铁1_1） |
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| 中文摘要:文章通过对矿床地质特征及矿物成分的研究，将前人确定的内蒙古羊蹄子 山沉积变质型铁矿床更正为沉积变质型钛矿床。并新发现了北部磨石山以金红石为主的富钛 矿体。文章还对该矿床的成矿模式进行了总结，给出了综合找矿标志。与羊蹄子山钛矿床地 质特征相似的钛矿床在国内外文献中尚未报道过，因此认为这是一个新的钛矿床类型，而且 在内蒙古中东部有较大的找矿前景。 |
| 中文关键词:地质学 钛矿床 沉积变质型 新类型 羊蹄子山 内蒙古 |
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| Yangtizishan metamorphosed sedimentary titanium deposit: Discovery of new genetic type of titanium deposit |
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| Abstract:The Yangtizishan metamorphosed sedimentary titanium deposit in Inner Mongolia be longs to a new genetic type. This deposit was formerly referred to as an iron de posit. Based on field and indoor investigation, the authors hold that it is a me tamorphosed sedimentary titanium deposit. The ore bodies occur in Lower Proteroz oic Erdaowa Group consisting of sericite_quartz schist in the stratoid and lenti cular forms. The ores have perthitic structure comprising chiefly interbedded qu artz perthite and ilmenite (±rutile) perthite. The ore minerals are mainly ilme nite and rutile and, subordinately, hematite and limonite, while the nonmetallic minerals are chiefly quartz with small amounts of biotite, amphibole (grunerite ) and garnet (spessartine_almandine). The ores contain 2.90%～18.14% TiO2, 8.0 4%～23.6% TFe, with very low P and S content. In the course of investigation, th e northern Moshishan rutile_dominated rich ore body was discovered by the author s. The genetic model of this deposit is as follows: (1) It was formed in a small oceanic basin under a oxygen_deficient (highly reducing) condition in Early Pro terozoic; (2) The ores precipitated in a minimum depth of below 200 m of sea wat er, being products of purely chemical precipitation; (3) The source of the major components of the titanium ore such as Si, Ti, Fe, and Mn seems to be hydrother mal or exhalative in the deep ocean basin; (4) The ore deposit has suffered regi onal metamorphism of intermediate degree; (5) In Mesozoic, the deposit was local ly subjected to reformation by granitic intrusion.This type of titanium ore deposit has never been reported in literature and is t herefore the first documented occurrence in the world. |
| keywords:geology, titanium deposit, metamorphosed sedimentary type, ne w genetic type, Yangtizishan, Inner Mongolia |
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