Volume 32 Issue 5
Oct.  2026
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PENG Y B,JIANG X J,LU C,et al.,2026. Relationship between reducing media and uranium mineralization in the Telaaobao uranium deposit, Ordos Basin[J]. Journal of Geomechanics,32(5):1206−1222 doi: 10.12090/j.issn.1006-6616.2026074
Citation: PENG Y B,JIANG X J,LU C,et al.,2026. Relationship between reducing media and uranium mineralization in the Telaaobao uranium deposit, Ordos Basin[J]. Journal of Geomechanics,32(5):1206−1222 doi: 10.12090/j.issn.1006-6616.2026074

Relationship between reducing media and uranium mineralization in the Telaaobao uranium deposit, Ordos Basin

doi: 10.12090/j.issn.1006-6616.2026074
Funds:  This research was financially supported by Inner Mongolia Autonomous Region "Elite Talent Boosting Mongolia" Project (Grant [2026] No. 1).
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  • Author Bio:

    彭云彪,二级正高级工程师,中国地质大学(武汉)博士生导师,2025年获第十九次李四光地质科学奖野外奖。现任中核铀业有限责任公司(中国核工业地质局)科技委专职委员、首席专家。长期扎根边远艰苦的内蒙古中西部地区,从事铀矿资源科研与勘查工作37年,是我国砂岩铀成矿理论技术创新的主要开拓者,砂岩铀矿地质勘查领域的领军人物和杰出代表。获国家科技进步二等奖1项,国防科技进步一等奖2项、二等奖3项、三等奖1项(排名1),内蒙古科技进步一等奖1项,湖北省科技进步一等奖1项,国土资源部优秀项目一等奖1项,全国十大地质找矿成果奖3项,全国十大地质科技进展奖1项;获黄汲清青年地质科学技术奖;获专利4项;获国家卓越工程师、内蒙古优秀科技工作者、最美科技工作者、草原英才、草原英才领军人才、十大杰出科技人才等称号;获科技部野外科技工作先进个人;享受国务院政府特殊津贴

  • Received: 2026-06-16
  • Revised: 2026-09-30
  • Accepted: 2026-09-30
  • Available Online: 2026-09-30
  • Published: 2026-10-28
  •   Objective  The Telaaobao uranium deposit is the first super-large uranium deposit hosted in the Lower Cretaceous strata in the northern Ordos Basin. Its sedimentary setting is markedly different from that of the numerous uranium deposits previously studied in the Middle Jurassic Zhiluo Formation. The uranium-bearing sandstone reservoirs in this deposit are notably deficient in traditional reducing agents, such as carbonaceous debris and pyrite. This limited understanding of reducing media has significantly hindered the refinement of uranium metallogenic models and the advancement of successful exploration. This study aims to identify the types and genetic characteristics of reducing media in the Telaaobao uranium deposit and elucidate their roles in uranium mineralization.   Methods  Optical microscopy, scanning electron microscopy (SEM) coupled with energy-dispersive spectroscopy (EDS), and electron probe microanalysis (EPMA) were employed, together with fluorescence analysis, sulfur isotope analysis, and acidolysis hydrocarbon analysis to characterize the reducing media and investigate their origins and roles in uranium mineralization. The findings were interpreted within the framework of the metallogenic model of the Telaaobao uranium deposit.   Results  Four types of reducing media were identified: carbonaceous debris, pyrite, hydrocarbon-bearing fluids, and chlorite. Hydrocarbon-bearing fluids were identified as the predominant reducing medium. The carbonaceous debris was mainly allochthonous and derived from older strata. Sulfur in pyrite primarily originated from bacteriogenic sulfides and organic sulfides. The hydrocarbon-bearing fluids were sourced from deep coal-, oil-, and gas-bearing strata and migrated into the deposit via faults in its vicinity. Chlorite can be subdivided into alteration products of mica and feldspar and authigenic chlorite.   Conclusions  Based on the Telao Bao metallogenic model, the types and roles of reducing media during different mineralization stages were discussed: (1) During the sedimentary-diagenetic stage in the early Early Cretaceous, the main reducing media were carbonaceous debris and metal sulfides such as pyrite; (2) In the late Early Cretaceous large-scale reduction stage, the principal reducing medium was deep-sourced hydrocarbon-bearing fluids; (3) From the Late Cretaceous to the Oligocene, during the secondary oxidation–mineralization stage, chlorite further enhanced the reducing capacity of the sandstone reservoirs, ultimately leading to termination of redox-driven mineralization.  Significance  These findings clarify the types, origins, and stage-specific roles of reducing media in the Telaaobao uranium deposit, highlighting the importance of deep-sourced hydrocarbon-bearing fluids in uranium mineralization. The results provide a basis for refining the metallogenic model of the deposit and may inform uranium exploration in comparable geological settings.

     

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