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Extraction and imaging of indicator elements for non-destructive,in-situ,fast identification of adverse geology in tunnels

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International Journal of Mining Science and Technology 2023年第12期33卷 1437-1449页

作者： Fumin Liu Peng Lin Zhenhao Xu Ruiqi Shao Tao Han School of Qilu Transportation Shandong UniversityJinan 250061China Geotechnical and Structural Engineering Research Center Shandong UniversityJinan 250061China

The lag in quantitative methods and detection techniques for geologic information has resulted in time-consuming and human-experienced geologic analysis in *** indicators of rocks can be used to identify adverse geology and to explain the intrinsic causes of damage to normal *** study proposes a method to identify adverse geology by extracting and imaging the indicator *** mapping relationship between rock components and geologic bodies is quickly determined by indicator element extraction based on factor analysis,and then the data are gridded for image *** location and size of the target adverse geology are visually identified through the distribution images of the indicator elements,thus reducing data dimensions and analysis time.A non-destructive,in-situ and fast element detection technique in tunnels was adopted to speed up the process of geology *** accuracy of the detection was validated by comparing field and laboratory test *** study further confirms and refines the previous research,and the results provide references for geological,mining and underground projects.

关键词： Adverse geology identification Indicator elements rock geochemistry Tunnel engineering Geological analysis

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geochemistry of the upper Permian sandstones in the Dalong Formation in the South Yellow Sea Basin,East China:implications to provenance,weathering,and tectonic setting

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Journal of Oceanology and Limnology 2021年第3期39卷 814-829页

作者： Yuxiao HUANG Xingwei GUO Xunhua ZHANG Laixing CAI Ocean University of China Qingdao 266071China Qingdao Institute of Marine Geology Qingdao 266071China Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Institute of Oceanology Chinese Academy of SciencesQingdao 266071China

To reconstruct the paleoenvironment,the petrography and geochemical compositions of the upper Permian Dalong Formation(Fm)(P_(3)d)sandstones in the Central Uplift,South Yellow Sea Basin,was investigated,after which the provenance,tectonic setting,weathering conditions,and diagenetic history were *** Dalong Fm is mainly composed of sandstones with a few mudstones and *** petrographic analysis showed that the P_(3)d sandstones are in low maturity and could be classified into feldspar sandstone and lithic sandstone on average framework composition of Q_(63)F_(16)L_(21).The major and trace element results show that Dalong Fm sandstones are enriched in Rb and depleted in Cr and Ni compared with the upper continental crust(UCC).The chemical weathering intensity is weak to low moderate in the source area as indicated by the chemical index of alteration(CIA)and other results from a variety of *** diagenetic process included three main stages:eodiagenesis,mesodiagenesis,and *** discrimination plots show that the source areas were an active continental margin(ACM)and a passive continental margin(PCM),which may have been related to the northward movement of the Lower Yangtze Plate(LYP)and the collision between the LYP and the North China Plate(NCP).

关键词： rock geochemistry rock weathering tectonic setting evolution of rock South Yellow Sea Basin

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Sodium-rich volcanic rocks and their relationships with iron deposits in the Aqishan-Yamansu belt of Eastern Tianshan,NW China

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Geoscience Frontiers 2020年第2期11卷 697-713页

作者： Zhiyuan Sun WangJingbin Yuwang Wang Lingli Long Zhaohua Luo Xiaohua Deng Qitao Hu Menglong Wang Beijing Institute of Geology for Mineral Resources Beijing 100012China School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China Shanshan Baodi Mining Limited Liability Company Shanshan 838204XinjiangChina

The volcanic rocks hosting the iron deposits in the Aqishan–Yamansu metallogenic belt are *** geochronology,petrography,and geochemistry of minerals and sodium-rich rocks as well as the relationship between these rocks and the iron deposits are ***,the ore-hosting volcanic rocks are sodiumrich(the averages of Na2O and Na2O/K2O are 4.31 wt.%and 8.56,respectively)and belong to the calc-alkaline *** are enriched in LREEs and LILEs(Ba,U,K,and Sr),but depleted in HFSEs(Nb,Ta,and Ti).SHRIMP zircon U–Pb dating of the crystal tuff in the Aqishan Formation and the dacite in the Tugutu Bulak Formation yields ages of 337.52.3 Ma(n?15,MSWD?0.85)and 313.03.3 Ma(n?13,MSWD?0.74),respectively,indicating that the sodium-rich volcanic rocks formed from the early–late *** microprobe data from plagioclases demonstrate that albites and/or oligoclases were formed in the basic–intermediate–acid volcanic *** stages of albitization are identified,and the latter is likely attributed to the dissolution of iron in the Aqishan–Yamansu *** sodium-rich volcanic rocks probably formed by the interaction between volcanic lava and seawater after volcanoes erupted on the seafloor;meanwhile,the albites formed by element substitution in a low-metamorphic *** spatiotemporal coupling relationship between sodium-rich volcanic rocks and iron deposits in the Aqishan–Yamansu belt is *** dissolved from the dark minerals of basic–intermediate volcanic rocks through sodium metasomatism is one of the material sources for the iron deposits.

关键词： Sodium-rich volcanic rock Geochronology rock geochemistry Yamansu metallogenic belt Eastern tianshan orogenic belt

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