摘要:
在湖南桃川-广西福利地区完成的1:5万区域地质矿产调查,以现代地层学、沉积学理论为指导,从岩石地层、生物地层、年代地层、层序地层等角度,对研究区进行了多重地层划分与对比.新填绘出易家湾组、黄公塘组和长龙界组岩石地层图,加强了非正式填图单位的表达.对天马山组绢云母凝灰质细砂岩、桥亭子组伊利石-绢云母凝灰质细砂岩、边溪组一段凝灰质细砂岩和边溪组二段凝灰质细-粉砂岩运用LA-ICP-MS碎屑锆石U-Pb定年研究,表明寒武纪-奥陶纪时期研究区亲华夏地块属性可能性更高.采用"岩性+时代"表达方式,对侵入岩进行重新划分和研究,并获得高精度同位素年龄,确定岩浆活动时间,研究岩浆活动与区内构造及成矿关系.调查区内构造形迹的展布及其特征,重点查明了玉龙山脚-大围山滑脱断裂和高塘-小田断裂带的地质特征、形成机制及控盆控矿特征.通过水系沉积物测量和异常查证等方法手段,查明了区内成矿地质背景和成矿条件,初步建立找矿模式,圈定了找矿远景区,总结了区域成矿规律,并提出了下一步工作建议.
Abstract:
On the basis of modern theory of stratigraphy and sedimentology,and working on the lithostratigraphy, biostratigraphy, chronostratigraphy and sequence stratigraphy, multiple stratigraphic division and correlation sequence has been improved during 1:50000 regional geological mineral survey in Taochuan area,Hunan-Fuli area,Guangxi.The units of formation of Yijiawan,Huanggongtang and Changlongjie have been mapped firstly in this area,and strengthen the express of informal mapping units.According to the detrital zircon U-Pb ages of formation of Tianmashan sericite tuffaceous fine sandstone,Qiaotingzi illite-sericite tuffaceous fine sandstone,member 1 of Bianxi tuffaceous fine sandstone and member 2 of Bianxi tuffaceous fine siltstone formation,we found that the studed area has higher affinity with Cathaysian block in Cambrian-Ordovician period.Restudy and divide the intrusive rocks by"Lithology + Geological Age" mapping unit, use zircon U-Pb dating analysis the relationship among magmatic activity,structure and mineralization.On the study of spatial distribution and features of structure in investigation area, we figure out the geologic feature, formation mechanism basin-controlling and ore-controlling characteristics of Yulongshanjiao-Daweishan detachment structure and Gaotang-Xiaotian structure.By stream sediments analysis and mineralization abnormalities check,identified the mineralization geological background and metallogenic condi-tion of investigation area,establish the genetic model,outline the potential prospective areas,sum up the metallogenic regulation,and make recommendations for further work.
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