合肥盆地中生代地层时代与源区的碎屑锆石证据

发布时间：2018-04-14 02:37

本文选题：合肥盆地 + 碎屑锆石　；参考：《地质论评》2017年04期

【摘要】：合肥盆地位于大别造山带北侧、郯庐断裂带西侧,其发育过程与这两大构造带演化密切相关。本次工作对合肥盆地南部与东部出露的中生代砂岩与火山岩进行了锆石年代学研究,从而限定了各组地层的沉积时代,确定了火山岩喷发时间,指示了沉积物的源区。这些年代学数据表明,合肥盆地南部的中生代碎屑岩自下而上分别为下侏罗统防虎山组、中侏罗统圆筒山组或三尖铺组、下白垩统凤凰台组与周公山组(或黑石渡组)与上白垩统戚家桥组,其间缺失上侏罗统。盆地东部白垩系自下而上为下白垩统朱巷组与响导铺组和上白垩统张桥组。该盆地出露的毛坦厂组或白大畈组火山岩喷发时代皆为早白垩世(130～120 Ma)。盆地南部的下——中侏罗统及白垩系源区皆为大别造山带,分别对应该造山带的后造山隆升与造山后伸展隆升。而盆地东部白垩系的源区始终为东侧的张八岭隆起带,后者属于郯庐断裂带伸展活动中的上升盘。
[Abstract]:The Hefei basin is located in the north of the Dabie orogenic belt and in the west of the Tanlu fault zone. The development process of the basin is closely related to the evolution of the two tectonic belts.The zircon chronology of Mesozoic sandstone and volcanic rocks exposed in the southern and eastern part of Hefei basin has been carried out in this work, thus limiting the sedimentary age of each group of strata, determining the eruption time of volcanic rocks and indicating the source region of the sediments.These geochronological data indicate that the Mesozoic clastic rocks in the southern part of Hefei Basin are the Lower Jurassic Fanghushan formation, the Middle Jurassic Cylindrical formation or the Sanjianpu formation from the bottom to the top, respectively.The lower Cretaceous Fenghuangtai formation, Zhougongshan formation (or Heshidu formation) and Upper Cretaceous Qijiaqiao formation are missing from the upper Jurassic.The Cretaceous system in the eastern part of the basin is composed of the lower Cretaceous Zhuxiang formation, the Xiangdaopu formation and the Upper Cretaceous Zhangqiao formation from the bottom to the top.The volcanic rocks of Maotanchang formation or Baidafan formation exposed in this basin are all in the early Cretaceous period.The Lower-Middle Jurassic and Cretaceous source areas in the southern part of the basin are Dabie orogenic belts, respectively, for the post-orogenic uplift and post-orogenic extension uplift of the ought orogenic belt.The source region of the Cretaceous in the eastern part of the basin is the Zhangbaling uplift belt on the east side, which belongs to the uplift in the extension of the Tanlu fault zone.
【作者单位】：合肥工业大学资源与环境工程学院;
【基金】：国家重点研发计划项目(编号:2016YFC0600102)的成果~~
【分类号】：P534.5

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