| 湖北省黄麦岭磷矿矿床地质特征和成矿条件简介 |
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| 引用本文：.1989.A brief discussion on geologlcal characteristics and ore-forming conditions of the Huangmailing phosphorus deposits[J].Mineral Deposits,8(4):78~84,90 |
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| 中文摘要:湖北省黄麦岭磷矿矿床产于中元吉界黄麦岭组下段含磷岩系中，属沉积变质磷灰岩型矿床。有磷灰岩三层，呈层状、似层状和透镜状产出。矿石自然类型简单，工业类犁均为硅质磷矿。磷质主要来源于火山物质，次是在古隆起的风化剥蚀碎屑中萃取。磷块岩是在温暖一炎热 的气候及适当的水介质条件下，在近海岸的封闭至半封闭的海盆地内沉积，产生磷块岩-粉砂岩中的碎屑沉积向化学沉积过渡部位。矿层形态规模受古地形控制。经后期区域变质作用使磷块岩变质成磷灰岩矿床。 |
| 中文关键词:黄麦岭 含磷岩系 磷灰岩 成矿条件 |
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| A brief discussion on geologlcal characteristics and ore-forming conditions of the Huangmailing phosphorus deposits |
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| Abstract:The Huangrnailing phosphorus ore district lies in Dawn County, Hubei province and in the southwestern part of Daleishan uplift which is the middle sector of Tongbai-Dabie uplift in the eastern part of Qinling geosynclines. The ore deposits occur in the phosphorus-bearing rocks of lower Huangmailing Formation of Middle Proterozoic IIongan Group and are distributed on or near depositional interface between Early Proterozoic Dabie Group and Middle Proterozoic Hongan Group. There are three apatite beds. Among them,Ⅱore bed assumes layered or stratoid form and is wide in distribution and large in size; locatly, it is intercalated with phosphorus-bearing quartz-mica schist and branches into Ⅱ1 and Ⅱ2 ore layers. I ore bed occurs continuously in layered form at the western part of the ore district but in lenticular form at other places. Ores have medium grade of P2O5, and the natural types of ore include striped leptynitic apatite, leptitic apadte, leptynitic apatite and mangano-apatite, and the industrial type belongs to siliceous phosphorus ore. The various types of ore are similar to or grade into each other in mineral association and chemical composition. The apatite in the ore is fluorapatite, whose F/P2O5 ratio is 0 .05—0.06. lower than that of fluorapatite from ores of phosphorite type and apatitolite type．The ore-forming materials were mainly derived from volcanic materials and next from phosphorous materials in fragments of weathered and denuded paleouplift. Plosphorite was deposited in offshore closed to semi-closed basins where the climate was warln to hot, pH values of seawater were 7.6—8.5, and Eh values were 0—0.77 volt. It occurred in the transitional position from clastic sediments to chemical sediments in phosphorite-siltstone facies, and the shape and dimension of the ore beds were controlled by paleotopography. Through late regional metamorphism, the phosphorite was turned into the apatite deposit. |
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