| 济源地区中-下三叠统碎屑锆石年代学特征及其物源分析 |
| |
| 引用本文： | 彭深远,杨文涛,王艳鹏,仲聪聪.济源地区中-下三叠统碎屑锆石年代学特征及其物源分析[J].地质科技通报,2019,38(5):126-137. |
| |
| 作者姓名： | 彭深远 杨文涛 王艳鹏 仲聪聪 |
| |
| 作者单位： | 河南理工大学资源环境学院 |
| |
| 基金项目： | 国家自然科学基金项目(41702106);河南省基础与前沿技术研究计划项目(152300410211) |
| |
| 摘 要： | 沉积物源组成及其演化是研究沉积盆地及盆山系统演化的关键。对济源地区中-下三叠统3个组进行了碎屑锆石U-Pb同位素分析,结果显示,下三叠统刘家沟组碎屑锆石具有6个年龄峰值:270,329,385,450,1885,2511Ma,其中晚古生代碎屑锆石应来自内蒙古隆起,早古生代碎屑锆石来自秦岭造山带,而新太古代-古元古代碎屑锆石则来自华北克拉通基底。下三叠统和尚沟组碎屑锆石年龄主峰值为420Ma,次峰值为745Ma和952Ma,均来自秦岭造山带。中三叠统二马营组碎屑锆石年龄主峰值为254Ma,可能来自华北板块南缘再旋回的沉积物,次峰值为1690Ma和2524Ma,应来自华北克拉通基底,其中1690Ma的碎屑锆石对应了华北板块南缘广泛出露的熊耳群。新元古界碎屑锆石由刘家沟组至和尚沟组增多,说明秦岭造山带基底逐渐剥露,是造山作用增强的体现。中三叠世末,秦岭造山带进入全面碰撞造山阶段,从地质演化过程来看,秦岭造山带在中三叠世也应处于持续隆升状态,然而二马营组中却没有来自秦岭造山带的碎屑锆石记录,而是以华北板块南缘盖层和基底为主,推测秦岭造山带的造山作用影响到了华北板块南缘,使华北板块南缘不断抬升,阻挡了秦岭造山带为济源地区提供沉积物。
|
| 关 键 词： | 碎屑锆石 物源分析 早-中三叠世 秦岭造山带 济源地区 |
Detrital Zircon Chronology of the Lower-Middle Triassic Strata in Jiyuan Area and Its Implication for Provenance Analysis |
| |
| Peng Shenyuan,Yang Wentao,Wang Yanpeng,Zhong Congcong.Detrital Zircon Chronology of the Lower-Middle Triassic Strata in Jiyuan Area and Its Implication for Provenance Analysis[J].Bulletin of Geological Science and Technology,2019,38(5):126-137. |
| |
| Authors: | Peng Shenyuan Yang Wentao Wang Yanpeng Zhong Congcong |
| |
| Institution: | (Institute of Resources and Environment, Henan Polytechnic University, Jiaozuo Henan 454000, China) |
| |
| Abstract: | The composition of sedimentary provenance and evolution is the key to restore prototype basin and analyze the evolution of mountain-basin system. The LA-ICP-MS dating used to determine the age of three strata of Lower-Middle Triassic in Jiyuan area reveals six age peaks of detrital zircons in Early Triassic Liujiagou Formation:270, 329, 385, 450, 1 885,2 511 Ma, respectively. Late Paleozoic zircons were derived from the Inner Mongolia Paleo-Uplift (IMPU), while Early Paleozoic detrital zircons were derived from Qinling Orogenic Belt (QOB), and Neoarchean-Paleoproterozoic zircons came from the basement of North China Carton (NCC). Detrital zircons of Heshanggou Formation have three age peaks:420, 745, 952 Ma, respectively, all of whih were derived from QOB. While in Middle Triassic,Ermaying Formation, detrital zircons with the main peak in 254 Ma should be derived from southern NCC, while zircons with the secondary peaks in 1 690 Ma were derived from Xionger Group distributed in southern NCC extensively, and those with the peak in 2 524 Ma were derived from the basement of NCC. The increase of Neoproterozoic zircons from Liujiagou Formation to Heshanggou Formation indicates that the basement of QOB was uplifted to the surface in the Early Triassic and the orogenic movement enhanced gradually.In the late Middle Triassic, QOB went into the stage of whole scale collision and orogenic movement. In terms of geology evolution, QOB should be uplifted in the Middle Triassic, while no zircon records is not recognized in Ermaying Formation from QOB. This suggest that the orogenic movement of QOB involved the southern NCC, causing it to uplift gradually, which blocked the detrital from QOB to Jiyuan area. |
| |
| Keywords: | detrital zircon provenance analysis Early-Middle Triassic Qinling orogenic belt Jiyuan area |
| 本文献已被 维普 等数据库收录！ |
| 点击此处可从《地质科技通报》浏览原始摘要信息 |
| 点击此处可从《地质科技通报》下载免费的PDF全文 |
|
