北山地区红柳园组沉积时代、沉积环境及源区构造背景分析

发布时间：2018-03-03 07:17

本文选题：北山地区　切入点：晚古生代　出处：《沉积学报》2017年03期 　论文类型：期刊论文

【摘要】：北山地区位于华北板块、塔里木板块和哈萨克斯坦板块交汇带,晚古生代构造演化倍受关注且久有争议,该地区晚古生代地层的研究对探讨大地构造演化具有重要意义。利用同位素定年、沉积相分析、粒度分析和碎屑成分统计分析方法对北山地区早石炭世红柳园组进行研究。在下部火山岩中获得LA-ICP-MS锆石U-Pb年龄为359.9±1.4 Ma,参考区域古生物资料,其形成时代应为早石炭世早期。红柳园组上部碎屑岩中发育大量浊流沉积构造和典型鲍马序列,其中砂岩成熟度较低,并且粒度分析结果显示具有浊流沉积的粒度特征,这些证据共同指示红柳园组为近物源浊流沉积。此外通过碎屑组分统计和Qt-F-L、Qm-F-Lt以及Qp-Lv-Ls图解对沉积构造背景进行了探讨,发现研究区红柳园组物源主要来自火山弧,表明其形成的构造环境应为与岛弧邻近的沉积盆地。
[Abstract]:The Beishan area is located in the North China plate, the Tarim plate and the Kazakhstan plate. The late Paleozoic tectonic evolution has attracted much attention and has been controversial for a long time. The study of late Paleozoic strata in this area is of great significance for the exploration of tectonic evolution. The early Carboniferous Hongliuyuan formation in Beishan area was studied by particle size analysis and clastic composition statistical analysis. The LA-ICP-MS zircon U-Pb age obtained from the lower volcanic rocks is 359.9 卤1.4 Ma.The regional paleontological data show that the zircon U-Pb age is 359.9 卤1.4 Ma. A large number of turbidite sedimentary structures and typical Baoma sequences were developed in the upper clastic rocks of Hongliuyuan formation, in which the sandstone maturity is relatively low, and the granularity analysis results show that it has the characteristics of turbidite sedimentary granularity. These evidences together indicate that the Hongliuyuan formation is a near-provenance turbidite deposition. In addition, the sedimentary tectonic background is discussed by means of clastic component statistics, Qt-F-L Qm-F-Lt and Qp-Lv-Ls diagrams. It is found that the source of Hongliuyuan formation in the study area is mainly from volcanic arc. It indicates that the tectonic environment is a sedimentary basin adjacent to the island arc.
【作者单位】：河北省区域地质矿产调查研究所;中国煤炭地质总局水文地质局;河北省地矿局第一地质大队;
【基金】：中国地质调查局项目(12120113056500)~~
【分类号】：P512.2

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