| 王永军,王瑞军,汪冰,张恩,卢辉雄,董双发,李名松.河北省半壁店铀矿点成矿地质特征研究[J].矿产勘查,2019,(8):1815-1822 |
| 河北省半壁店铀矿点成矿地质特征研究 |
| Uranium deposit ore-controlling geological characteristics research in Banbidian Hebei |
| 投稿时间：2018-09-14 |
| DOI： |
| 中文关键词: 成矿模式 构造控矿 铀矿化特征 半壁店铀矿点 沽源火山盆地 |
| 英文关键词: metallogenic model, tectonic ore-controlling, Uranium mineralization characteristics, Banbidian Uranium ore, Guyuan volcanic basin |
| 基金项目:本文得到中国核工业地质局项目(编号:2009-95和编号:2010-46)资助。 |
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| 中文摘要: |
| 通过对半壁店铀矿点的成矿地质特征进行综合研究,分析了铀矿点的形态规模、赋矿主岩、主要控矿构造、围岩蚀变和成矿阶段等铀矿化特征,初步构建了铀成矿模式。半壁店铀矿点产于沽源火山盆地南缘的半壁店塌陷型破火山口,受火山岩地层、断裂构造及破火山口构造复合控制。铀矿点受区域性北西向半壁店—富山断裂带的次级断裂控制,铀矿体或铀矿化呈带状、脉状产于北西向断裂构造带中,矿化类型为铀-赤铁矿化,矿石矿物主要为硅钙铀矿、钙铀云母等次生铀矿物,铀以分散吸附形态为主。赋矿主岩具富硅、富钾、富铀、富铝、贫钙等地球化学特征,可能形成于陆缘板内环境,成岩岩浆可能来自上地幔,与破火口塌陷作用有关。围岩蚀变具上酸下碱的垂向分带特征,上部发育硅化、高岭石化、褐铁矿化、萤石化等酸性蚀变；下部发育赤铁矿化、水云母化、绿泥石化、钾长石化、蒙脱石化等偏碱性蚀变。矿前期蚀变主要为水云母化、蒙脱石化等；成矿期蚀变主要发育赤铁矿化,其次为硅化、萤石化、水云母化、绿泥石化等。铀成矿经历了赤铁矿化阶段和金属硫化物阶段,赤铁矿化阶段主要形成于流纹斑岩侵入时期,是铀元素初步富集阶段；金属硫化物阶段主要形成于花岗斑岩侵入时期,是主要的铀成矿阶段,是铀元素二次富集阶段,铀矿脉呈细脉状、网脉状胶结或切割赤铁矿化阶段形成的铀矿化。半壁店铀矿点的形成经历了太古宙—元古宙铀预富集、早中生代铀二次富集、晚中生代铀成矿和新生代铀矿次生改造等四个阶段。 |
| 英文摘要: |
| Through Sanshan uranium ore-forming geological characteristics of comprehensive study, the paper analyzes the formation of uranium deposit point scale, fu sandstones, the main ore-controlling structure, wall rock alteration and mineralization stage, the uranium mineralization characteristics of uranium metallogenic model is constructed. Sanshan native to sell uranium source volcanic type Sanshan of southern margin of the basin subsidence caldera, the volcanic rock strata, fault structure and the caldera compound control. Uranium point by regional north west Sanshan - rich mountain fault zone of secondary fracture control.sandstones with rich silicon, rich potassium, aluminium rich, poor, rich uranium geochemical characteristics such as calcium, may be formed in the epicontinental intraplate environment, rock magma may come from the upper mantle, and break the crater collapse.Uranium mineralization experienced hematite and metal sulfide phase, hematite, stage mainly formed in the rhyolitic porphyry intrusive period; Metal sulfide stage mainly formed in the granite porphyry intrusive period, is the main uranium mineralization stage. Sanshan formation of point of uranium has experienced the archean - archean uranium pre-enrichment, early Mesozoic secondary uranium enrichment and late Mesozoic uranium mineralization and new generation of uranium secondary transformation such as four stages. |
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