Geochemical characteristics and geological significance of chert nodules in Qixia formation,Pingding Mountain, lower Yangtze Plate

作     者：LI Jun CHEN Lu-wang HAOChun-ming ZHANG Jie CHEN Song GUI He-rong LI Jun;CHEN Lu-wang;HAO Chun-ming;ZHANG Jie;CHEN Song;GUI He-rong

作者机构：School of Resources and Environmental EngineeringHefei University of TechnologyHefei 230000China National Engineering Research Center of Coal Mine Water Hazard Controlling(Suzhou University)Suzhou 234000China School of Resources and Civil EngineeringSuzhou UniversitySuzhou 234000China North China Institute of Science and TechnologyXueyuan Street 467Sanhe 065201China 

出 版 物：《Journal of Mountain Science》 (山地科学学报（英文）)

年 卷 期：2021年第18卷第1期

页      面：88-100页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 07[理学] 0303[法学-社会学] 070902[理学-地球化学] 070901[理学-矿物学、岩石学、矿床学] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 0705[理学-地理学] 0815[工学-水利工程] 0706[理学-大气科学] 0816[工学-测绘科学与技术] 0813[工学-建筑学] 0704[理学-天文学] 0833[工学-城乡规划学] 0713[理学-生态学] 0834[工学-风景园林学（可授工学、农学学位）] 

基　　金：funded by National Natural Science Foundation of China(41773100,41373095) Development fund for key disciplines of Suzhou University(2017xjzdxk2) Research Project of Wanbei Coal-Electricity Group Co.Ltd(2018) 

主　　题：Cherts nodule Geochemistry Siliceous limestone PingdingMountain Depositional environment Silica source 

摘      要：The Permian is an important period for the deposition of siliceous rocks on a global scale,but the genesis of chert is still *** better understand the mechanism of chert nodules deposition from Qixia Formation(P1q)(Lower Yangtze Plate,China),we analyzed the major,trace and rare earth elements of these chert nodule samples(CN)and surrounding rock samples(SR)using Inductively Coupled Plasma Mass Spectrometry(ICPMS)and X-ray fluorescence(XRF)*** redox state,siliceous sources and depositional environment analysis show that CN have higher contents of SiO2,Fe2O3 and MnO comparing with SR,and their geochemical properties are *** and rare earth elements characteristics reveal that nodules were deposited under the action of biochemistry in the basin,no terrigenous materials contamination was observed and the contribution of upwelling was *** Al/(Al+Fe+Mn),Fe/Ti and Al-Fe-Mn discrimination diagram indicated the chert nodules are influenced by hydrothermal *** from redox-sensitive elements such as Th,U,V and Sc suggests that nodules were deposited in a reducing *** the convective mixing of hydrothermal action and normal seawater,excessive dissolved silicon and nutrients are absorbed and precipitated by biological action,and then transported by upwelling to shallow water for *** the evidence comes from the trace elements enrichment characters,Rare earth elements and Y(REY)distribution patterns and La/La^(*),Ce/Ce^(*),Eu/Eu^(*),LREE/HREE,Y/Ho and∑REE characteristics.