GEOLOGY AND GENESIS OF XIHUITONG LOW-GRADE PHOSPHATE DEPOSIT IN WESTERN LIAONING PROVINCE
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摘要:
辽西西灰同低品位磷矿床位于中生代阜（新）义（县）盆地北西端，矿体为含磷灰石石英闪长质片麻岩，呈层状、似层状展布，P2O5含量较低，但较稳定.矿石中矿物成分主要为斜长石、黑云母、角闪石、磷灰石、石英、磁铁矿和辉石.通过对该磷矿床的成矿地质背景、地质特征和矿体特征研究，从成矿物质来源、成矿构造环境、成矿作用等方面进行探讨，初步认为该矿床受太古宙绿岩建造控制，在时间与空间上与火山岩关系密切，成矿阶段可分为初始成矿期、变质成矿期和热液改造期.
Abstract:The Xihuitong low-grade phosphate deposit in western Liaoning Province is located in the northwest of Mesozoic Fuxin-Yixian basin, with the orebody of apatite-bearing quartz diorite gneiss occurring in stratified and stratiform-like forms, and stable low P2O5 content. The main mineral compositions in the ores are plagioclase, biotite, hornblende, apatite, quartz, magnetite and pyroxene. Through the study of metallogenic geological setting, geological characteristics and orebodies of the phosphate deposit, the paper discusses the ore-forming materials, metallogenic tectonic setting, and mineralization. It is preliminarily considered that the deposit is controlled by the Archean greenstone formation, and is closely related to volcanic rocks in time and space. The ore-forming period can be subdivided into initial mineralization, metamorphic mineralization and hydrothermal transformation stages.
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Key words:
- phosphate deposit /
- orebody characteristics /
- metallogenesis /
- volcanic rock /
- Liaoning Province
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表 1 矿区内上、下部矿体P2O5含量分布统计表
Table 1. Distribution of P2O5 content in upper and lower orebodies of the mining area
矿体部位 剖面号 总样品数/个 平均值 含量＜1.0% 1.0%~1.5% 1.5%~2.0% >2.0% 变化系数/% 样品数/个 比例/% 样品数/个 比例/% 样品数/个 比例/% 样品数/个 比例/% 上部矿体 0 95 1.95 0 0 4 27 4 27 7 46 27.93 1 43 2.03 1 2 2 5 16 37 24 56 19.05 2 19 2.01 0 0 1 5 6 32 12 63 17.78 4 43 1.42 21 49 3 7 10 23 9 21 46.56 A 22 1.78 2 9 3 14 9 41 8 36 22.65 6 50 2.16 3 6 5 10 2 4 40 80 25.59 小计 192 1.89 27 14 18 9 47 24 100 52 30.84 下部矿体 0 57 2.13 1 2 2 4 12 21 42 74 15.22 1 24 2.02 0 0 0 0 13 54 11 46 11.28 2 42 2.13 0 0 1 2 12 29 29 69 12.22 4 11 1.97 0 0 0 0 7 64 4 36 6.95 A 10 2.03 0 0 0 0 3 30 7 70 9.78 小计 144 2.09 1 1 3 2 47 33 93 64 13.24 
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表 2 太古宙绿岩带型磷矿（岩）石化学成分
Table 2. Chemical compositions of Archean greenstone belt phosphate ore/rock
岩（矿）石类型 SiO2 Al2O3 TiO2 Fe2O3 FeO MnO2 MgO CaO Na2O K2O P2O5 西灰同-石英闪长质片麻岩 50.82 13.20 1.60 16.17 0.19 3.97 5.64 1.59 2.12 1.89 西灰同-石英闪长质片麻岩 47.02 13.98 1.44 16.18 0.15 4.86 8.14 2.38 2.20 2.09 辽宁建平乌兰乌苏磷矿-斑杂状黑云斜长混合岩* 52.75 2.02 14.58 5.39 0.12 2.35 5.16 3.93 3.70 0.18 河北丰宁招兵沟-混合质黑云角闪斜长片麻岩* 49.53 16.05 1.25 5.37 7.49 0.12 6.36 8.86 2.93 0.58 0.16 国外绿岩带-安山岩* 56.70 14.00 0.92 2.30 7.00 5.40 6.60 3.40 0.67 0.64 国外绿岩带-拉斑玄武岩* 49.50 15.20 1.49 2.80 9.17 0.18 6.82 8.79 2.70 0.66 0.17 *据文献[8]. 含量单位：%.
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