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

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Journal of Mountain Science 2021年第1期18卷 88-100页

作者： LI Jun CHEN Lu-wang HAOChun-ming ZHANG Jie CHEN Song GUI He-rong School of Resources and Environmental Engineering Hefei University of TechnologyHefei 230000China National Engineering Research Center of Coal Mine Water Hazard Controlling(Suzhou University) Suzhou 234000China School of Resources and Civil Engineering Suzhou UniversitySuzhou 234000China North China Institute of Science and Technology Xueyuan Street 467Sanhe 065201China

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.

关键词： Cherts nodule Geochemistry Siliceous limestone PingdingMountain Depositional environment silica source

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Quartz types,genesis and their geological significance within the Wufeng-Longmaxi Formation in north-western Hunan,China

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Frontiers of Earth Science 2023年第2期17卷 455-469页

作者： Ke ZHANG Shuheng TANG Zhaodong XI Yapei YE School of Energy Resource China University of Geosciences(Beijing)Beijing 100083China Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism Ministry of EducationBeijing 100083China Key Laboratory of Strategy Evaluation for Shale Gas Ministry of Land and ResourcesBeijing 100083China

Quartz is an important mineral component in the Late Ordovician–Early Silurian Wufeng-Longmaxi Formation with various forms and sources and has a significant impact on the properties of shale gas *** this study,geochemical analysis,scanning electron microscopy(SEM)observation,and rock mechanics testing were performed on shale samples from the Wufeng-Longmaxi Formation in north-western Hunan,South *** is classified into four types based on morphological features and cathodoluminescence(CL)images under SEM–terrigenous detrital quartz,quartz overgrowths,biogenic skeletal quartz and *** quartz in Upper Longmaxi Formation is predominantly of terrigenous origin and contains a small amount of quartz formed by clay *** quartz in the Wufeng-Lower Longmaxi Formation is predominantly *** biogenic quartz has a direct effect on organic matter(OM)abundance,pore structure and *** is indicated by the positive correlation with TOC content and biogenic Ba content that biogenic quartz-rich strata have high *** rigid frameworks formed by biogenic quartz during the early diagenesis stage facilitated the preservation of the primary *** interparticle pores of biogenic quartz are the space for OM preservation and migration,creating conditions for the development of OM ***,the calculated brittleness index(BI)shows a positive correlation with biogenic quartz content,indicating that layers rich in biogenic quartz are more conducive to ***,the Wufeng-Lower Longmaxi Formation has higher OM content,porosity and represents a more favorable exploration and development target.

关键词： quartz silica source porosity organic matter rock mechanics

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Synthesis of Mesoporous Material from Chrysotile-Derived silica

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Materials Sciences and Applications 2013年第8期4卷 68-72页

作者： Anderson Joel Schwanke Christian Wittee Lopes Sibele Berenice Castella Pergher PPGCEM Universidade Federal do Rio Grande do NorteNatalBrazil Chemistry Institute Universidade Federal do Rio Grande do NorteNatalBrazil

Mesoporous MCM-41-type molecular sieves were synthesized using calcined and leached chrysotile and cetyltrimethylammonium bromide as the silica source and structure directing agent, respectively. Powder X-ray diffraction (XRD), N2 isothermal adsorption-desorption, scanning electron microscopy (SEM) and thermogravimetric analysis (TGA) were used to characterize the samples. The calcined and leached chrysotile can be employed as an inexpensive silica source for the formation of low-order MCM-41 mesoporous materials.

关键词： MCM-41 Chrysotile silica source

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