| 刘 波.腾格尔坳陷砂岩型铀矿控矿成因相特征及远景预测[J].地质与勘探,2015,51(5):870-878 |
| 腾格尔坳陷砂岩型铀矿控矿成因相特征及远景预测 |
| Characteristics ore-controlling genesis facies and prospect prediction of sandstone-type uranium deposits in the Tengger depression, Inner Mongolia |
| 投稿时间：2015-06-04 修订日期：2015-07-09 |
| DOI： |
| 中文关键词: 赛汉组 铀储层 控矿成因相 远景预测 腾格尔坳陷 |
| 英文关键词: uranium deposit, ore-controlling genesis facies, prospect prediction, Saihan Formation, Tengger depression |
| 基金项目:中国核工业地质局项目（编号201506）二连盆地腾格尔坳陷铀矿远景调查资助。 |
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| 中文摘要: |
| 本文在现有钻探资料的基础上，对腾格尔坳陷赛汉组上段铀成矿环境、砂分散体系、体系域、控矿成因相特征进行了分析研究，并圈定了三级成矿远景区。研究认为，研究区周缘铀源条件优越,陆源碎屑具有近物源、粒度粗，成熟度低，搬运水动力强的特征。赛汉组上段发育高位体系域、低位体系域，具有完整的进积-退积型准层序组，与赛汉组下段湖侵体系域构成“细-粗-细”粒序结构。赛汉组上段控矿沉积体系为辫状河沉积体系河道亚相、辫状河三角洲体系三角洲平原亚相、三角洲前缘亚相。控矿沉积体系内砂体连通性较好，有利于流体运移及潜水-层间氧化带发育，控制了矿体、矿化异常的产出。控矿成因相类型为辫状河三角洲潜水-层间氧化带型、扇三角洲潜水-层间氧化带型、古河谷型潜水-层间氧化带型。 |
| 英文摘要: |
| This paper studies the uranium mineralization environment, sand dispersion system, system tract and ore-controlling genesis facies of the upper Saihan Formation in the Tengger depression on the basis of existing drill data. The study suggests that there are abundant uranium sources around the depression. The terrigenous clastic is characterized by near provenance, coarse-grain, low maturity, and strong stream power for transport. The complete prograde-retrogradation parasequence sets developed in the upper Saihan Formation, forming a highstand system domain and lowstand system domain. The highstand system tract, lowstand system domain and lacustrine transgressive system tract (lower Saihan Formation ) constitute a “fine-coarse-fine” graded structure. The channel subfacies of the braided fluvial system, and braided river delta plain subfacies and braided delta front subfacies of braided fluvial delta system are the main ore- control depositional system in the upper Saihan Formation. Sand bodies of the ore-control depositional system are well connected favorable for current migration and development of phreatic-interlayer oxidation zones. The sand bodies controlled the ore body and mineralization anomalies. The ore-control genetic facies types include braided river delta phreatic-interlayer oxidation, fan delta phreatic-interlayer oxidation and paleo-channel phreatic-interlayer oxidation. |
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