内蒙古1:5万乌音呼日勒庙等四幅区域地质矿产调查新进展

New progresses and achievements of 1:50 000 regional geological survey of Wuyinhurile Temple sheet and the other three sheets in Inner Mongolia

内蒙古1∶5万乌音呼日勒庙等四幅区域地质矿产调查项目取得的新进展及主要成果为:根据岩石组合、动植物化石及同位素年龄等,重新厘定、划分了16个岩石地层填图单位,在多个组段沉积岩层位中首次发现丰富的动、植物化石,建立了各地层年代学格架;将侵入岩重新解体划分为4个填图单元,并建立了侵入岩年代学格架;新发现1处规模较大的韧性变形带,主要为逆—左行走滑韧性断层,时代归属于中三叠世末期,为额尔古纳河—阿龙山NE向韧性变形域的南部延伸;新发现矿(化)点20处,其中金属矿点3处,金属矿化点6处,非金属矿点9处,非金属矿化点2处;总结了该区成矿规律,圈定了成矿远景区及找矿靶区。

The new progresses and achievements of 1 ∶ 50 000 regional geological survey of Wuyinhurile Temple sheet and the other three sheets in Inner Mongolia were as follows. Based on rock associations,animal and plant fossils and isotopic age,the authors redefined and divided the rock succession into sixteen lithostratigraphic mapping units. Abundant animal and plant fossils were found for the first time in a variety of sedimentary rock intervals,and the chronological frameworks of the sedimentary strata were established. The intrusive rocks were redivided into four mapping units,and the chronological frameworks of intrusive rocks were established. A large-scale ductile deformation zone was discovered and interpreted as an inverse-left-lateral ductile strike-slip fault of the late Middle Triassic period,which was the southern part of the NE-trending Ergun River-Alongshan ductile deformation domain. The authors have discovered twenty new mineral occurrences,including three metal mineral occurrences,six mineralization occurrences,nine non-metallic occurrences,and two mineralization occurrences.This paper also summarized the metallogenic regularity in the area,and delineated mineralization and prospecting target areas.