王艳鹏, 杨文涛, 祁帅帅.华北克拉通南缘古-中生代构造转换期的泥岩地球化学特征响应[J].河南理工大学学报（自然科学版）,2020,39(4):27-37.

WANG Y P, YANG W T, QI S S.Geochemical characteristics response of mudstone in the southern margin of the North China Craton during the Paleozoic-Mesozoic structural transition[J].Journal of Henan Polytechnic University(Natural Science) ,2020,39(4):27-37.

华北克拉通南缘古-中生代构造转换期的泥岩地球化学特征响应

王艳鹏, 杨文涛, 祁帅帅

河南理工大学 资源环境学院，河南 焦作454000

摘要:豫西宜阳地区晚古生代一早中生代连续的沉积记录为研究华北南缘沉积和构造演化提供了重要窗口。通过对研究区中二叠统一下三叠统的泥岩主量、微量和稀土元素地球化学特征分析，讨论包括源岩成分、源区化学风化条件和源区构造背景在内的源区属性特征，对沉积物源区进行限定。结果表明：宜阳地区中二叠统一下三叠统泥岩源岩整体上都以上地壳长英质物源为主，源岩性质主要为花岗岩类并伴有古老沉积岩成分参与；石盒子组的源岩经历了强烈的化学风化作用，沉积物可能经历了稳定构造环境下的沉积再循环，从孙家沟组开始，化学风化作用降低，沉积物开始向构造活动区域的初次沉积转变；源区构造背景在垂向上由石盒子组的以被动大陆边缘为主向孙家沟组的以被动大陆边缘、大陆岛弧和活动大陆边缘多种性质混合背景过渡，最后向刘家沟组与和尚沟组的以大陆岛弧和活动大陆边缘为主的趋势演变。结合古流向和碎屑错石等证据，指示华北南缘和北秦岭可能从孙家沟组平顶山砂岩段开始，产生了强烈隆起并成为华北克拉通南缘宜阳地区的主要物源区，其显著的地球化学特征差异为华北克拉通南缘古-中生代产生的构造转换提供了重要的地球化学依据。

关键词:华北克拉通南缘;宜阳地区;中二叠统一下三叠统;泥岩;地球化学特征;物源分  析;构造转换

doi:10.16186/j.cnki.1673-9787.2020.4.4

基金项目:国家自然科学基金资助项目（41702106）

收稿日期:2019/05/08

修回日期:2019/06/06

出版日期:2020/07/15

Geochemical characteristics response of mudstone in the southern margin of the North China Craton during the Paleozoic-Mesozoic structural transition

WANG Yanpeng, YANG Wentao, QI Shuaishuai

Institute of Resource and Environment， Henan Polytechnic University，Jiaozuo 454000，Henan， China

Abstract:The successive sedimentary record of the late Paleozoic-early Mesozoic in Yiyang area， western Henan， provides an important window for studying the sedimentary and tectonic evolution of the southern margin of the North China Craton. Based on the analysis of geochemical characteristics of the main quantity， trace elements and rare earth elements of the mudstone from the Middle Permian to the Lower Triassic in the source area， this paper discussed its attribute characteristics， including the source rock composition， the chemical weathering conditions and the structural background of the source area， and defined the source area of the sediment. The results showed that the source rocks of Middle Permian-Lower Triassic mudstones in Yiyang area were mainly felsic in the upper crust， and which were mainly granitoids with the participation of ancient sedimentary rocks；The source rocks of the Shihezi formation had experienced strong weathering and the sediments might have undergone sedimentary recycling under stable tectonic environment， however， the chemical weathering decreased from the stage of the Sunjiagou Formation， the sediments began to transform to the primary sediments in the tectonic active area ； The structural background of the source area had a trend of evolution from the passive continental margin of the Shihezi Formation to the mixed background of the passive continental margin， continental island arc and active continental margin of the Sunjiagou formation， and finally to the continental island arc and active continental margin of the Liujiagou formation and the Heshanggou formation in the vertical direction. Combined with the evidence of paleocurrent and detrital zircons， it was suggested that the southern margin of North China and the northern Qinling might have a strong uplift from Pingdingshan sandstone section of Sunjiagou formation and become the main provenance of Yiyang area. These significant geochemical differences provided an important geochemical basis for the Paleo-mesozoic tectonic transformation in the southern margin of the North China Craton.

Key words:southern margin of the North China Craton;Yiyang area;Middle Permian -Lower Triassic;mudstone;geochemical characteristic;provenance analysis;tectonic transition

华北克拉通南缘古_中生代构造转换期的泥岩地球化学特征响应_王艳鹏.pdf