Analysis on metallogenic conditions of ISL-amenable sandstone-type uranium deposits in Kelulun down-faulted basin,Inner Mongolia
Kelulun down-faulted basin is a secondary tectonic unit of Hailaer basin.It is located at the southwestern margin of the Hailaer basin and is a rectangular-shaped basin stretching in NE direction with an area of about 2000 km~2.The northwestern margin of the basin is a tectonic slope with a complete and independent recharge-run off-discharge system of groundwater.Basement rocks are characterized by high original uranium content,moreover,most uranium in basement rocks may be reactivated and released during epigenetic reworking process.The paleoclimate in Kelulun basin experienced an evolution from mild-humid to hot-arid period,being favorable for the metallogenesis of ISL-amenable sandstone-hosted uranium deposits.The upper member of the Damoguaihe Formation,Lower Crtaceous is regarded as the prospecting target in Kelulun basin because favorable sand bodies occur in the member.Two uranium mineralization types have been recognized,namely the interlayer oxidation zone type and the phreatic oxidation type.In a word,favorable uranium metallogenic conditions exist in Kelulun down-faulted basin.It is of further prospecting potential.