| 莫帮洪.四川盆地北缘旺苍背斜铀成矿地质特征及找矿前景?[J].地质与勘探,2019,55(2):519-527 |
| 四川盆地北缘旺苍背斜铀成矿地质特征及找矿前景? |
| Uranium metallogenetic geological characteristics and prospecting potential of the Wangcang anticline in the northern margin of the Sichuan basin |
| 投稿时间：2018-03-05 修订日期：2018-11-08 |
| DOI：10.12134/j.dzykt.2019.02.007 |
| 中文关键词: 砂岩型铀矿 铀矿找矿前景 旺苍背斜 四川盆地 |
| 英文关键词: sandstone-type uranium deposits, uranium prospecting potential, Wangcang anticline |
| 基金项目:中国地质调查局基础性公益性地质矿产调查（DD2016013627）；中国核工业地质局区域评价项目（201365）联合资助 |
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| 中文摘要: |
| 旺苍背斜位于四川盆地北缘北西部，工作程度较低。在收集前人资料以及野外地质调查的基础上，分析了地质特征、含矿层特征、铀矿化特征，认为铀矿化产于苍溪组第一层，赋存于富含有机质的岩屑砂岩或砾岩中，距上侏罗统蓬莱镇与下白垩统苍溪组的区域性假整合面较近，与冲刷构造关系密切，属于以沉积成矿为主，后生改造为辅的砂岩型铀矿。根据成矿理论，分析了构造背景、铀源、目的层、地貌及水文地质、古气候、已知铀矿化信息等成矿判据，认为旺苍背斜具备了形成砂岩型铀矿床的成矿条件，并指出在转折端一带铀异常点（带）较为密集，含矿砂体厚度大，富含有机质，沉积构造发育，地下水具备完善补给-径流-排泄系统，具有较好的找矿前景。 |
| 英文摘要: |
| The Wangcang anticline is located in the northwest of the northern margin of Sichuan Basin, where little research work about uranium geology has been made. Based on field geological surveys and data available, this paper makes a analysis on the geological characteristics, ore-hosting sandstone beds and uranium mineralization of this structure. It is suggested that uranium mineralization occurred in the first layer of the Cangxi Formation, the lithic sandstone or conglomerate containing organic matter. It is close to the parallel unconformity between the upper Jurassic Penglaizhen Formation and the lower Cretaceous Cangxi Formation and closely related to the scour structure. Uranium mineralization is attributed to sandstone-type uranium deposits dominated by sedimentation in genesis and was reformed in the later period. According to the metallogenic theory of sandstone-type uranium deposit, the tectonic setting, the source of uranium, target strata, geomorphological and hydrogeological conditions, paleoclimate, and known uranium mineralization information, this anticline has the metallogenic geological conditions of sandstone-type uranium deposits. It is also noted that uranium anomaly occurrences (belts) are relatively dense around the turning point of the anticline, where the ore-bearing sand bodies are thicker with abundant organic matters, sedimentary structures, and a perfect recharge-runoff-discharge system of groundwater, implying a good ore-search prospect. |
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