使用 VLF-EM 和高级滤波技术对 Dharwar 克拉顿的褐铁矿场进行地球物理特征描述:电导率分析和分析信号绘图的启示

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Ravi Jonnalagadda, R. R. Mathur, A. Sridhar
{"title":"使用 VLF-EM 和高级滤波技术对 Dharwar 克拉顿的褐铁矿场进行地球物理特征描述:电导率分析和分析信号绘图的启示","authors":"Ravi Jonnalagadda, R. R. Mathur, A. Sridhar","doi":"10.1093/jge/gxae035","DOIUrl":null,"url":null,"abstract":"\n This study presents a geophysical investigation of the lamproite fields located in the Dharwar craton, aiming to map conductivity variations using contemporary techniques. The study employs very low-frequency electromagnetic (VLF-EM) methods, applying Hilbert transformations and first-order vertical derivatives to the Fraser and Karous-Hjelt filtered contoured of VLF-EM data. The Peninsular Gneissic Complex (PGC) granitic rocks in the study area experienced tectonic forces, resulting in fractures along specific WNW-ESE to NW-SE trends. Within these crustal weak zones, these lamproites are emplaced. The lamproite pipes are volcanic rocks. Hence, the top portions are weathered and tend to conductive, and the conductivity tend to decreases with the depth. The volumetric size of lamproites ranges from centimetres to hundreds of meters, unlike kimberlites, which are larger. Hence, the exploration of lamproites poses challenges. The contours of in-phase and quadrature components were used to identify the cluster of lamproite zones within the study area. From this study, the boundaries of the lamproite pipes were clearly identified using real component's analytical and first-order vertical derivative signal contour maps. The VLF-EM pseudo depth current density section was used to identify anomalous lamproite, pipes, and their subsurface extensions, along with the surrounding formations. The current investigation findings specify that the lamproites exhibit weak conductive. These results provide valuable insights for exploration efforts within the Dharwar craton, and can aid in the identification and mapping of the lamproite fields.","PeriodicalId":1,"journal":{"name":"Accounts of Chemical Research","volume":" 107","pages":""},"PeriodicalIF":16.4000,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Geophysical Characterization of Lamproite Fields in the Dharwar Craton Using VLF-EM and Advanced Filtering Techniques: Insights from Conductivity Analysis and Analytical Signal Mapping\",\"authors\":\"Ravi Jonnalagadda, R. R. Mathur, A. Sridhar\",\"doi\":\"10.1093/jge/gxae035\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"\\n This study presents a geophysical investigation of the lamproite fields located in the Dharwar craton, aiming to map conductivity variations using contemporary techniques. The study employs very low-frequency electromagnetic (VLF-EM) methods, applying Hilbert transformations and first-order vertical derivatives to the Fraser and Karous-Hjelt filtered contoured of VLF-EM data. The Peninsular Gneissic Complex (PGC) granitic rocks in the study area experienced tectonic forces, resulting in fractures along specific WNW-ESE to NW-SE trends. Within these crustal weak zones, these lamproites are emplaced. The lamproite pipes are volcanic rocks. Hence, the top portions are weathered and tend to conductive, and the conductivity tend to decreases with the depth. The volumetric size of lamproites ranges from centimetres to hundreds of meters, unlike kimberlites, which are larger. Hence, the exploration of lamproites poses challenges. The contours of in-phase and quadrature components were used to identify the cluster of lamproite zones within the study area. From this study, the boundaries of the lamproite pipes were clearly identified using real component's analytical and first-order vertical derivative signal contour maps. The VLF-EM pseudo depth current density section was used to identify anomalous lamproite, pipes, and their subsurface extensions, along with the surrounding formations. The current investigation findings specify that the lamproites exhibit weak conductive. These results provide valuable insights for exploration efforts within the Dharwar craton, and can aid in the identification and mapping of the lamproite fields.\",\"PeriodicalId\":1,\"journal\":{\"name\":\"Accounts of Chemical Research\",\"volume\":\" 107\",\"pages\":\"\"},\"PeriodicalIF\":16.4000,\"publicationDate\":\"2024-03-21\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Accounts of Chemical Research\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://doi.org/10.1093/jge/gxae035\",\"RegionNum\":1,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Accounts of Chemical Research","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1093/jge/gxae035","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0

摘要

本研究介绍了对位于达瓦尔克拉通的灯铁矿场进行的地球物理调查,旨在利用现代技术绘制电导率变化图。研究采用甚低频电磁(VLF-EM)方法,将希尔伯特变换和一阶垂直导数应用于甚低频电磁数据的弗雷泽和卡罗斯-赫耶尔特滤波等值线。研究区域的半岛片麻岩群(PGC)花岗岩经历了构造力作用,导致沿特定的 WNW-ESE 至 NW-SE 走向出现断裂。在这些地壳薄弱带中,这些灯管岩被植入其中。灯管岩属于火山岩。因此,顶部风化,具有导电性,而且导电性随着深度的增加而减弱。灯石的体积大小从几厘米到几百米不等,不像金伯利岩那样体积较大。因此,对灯岩的勘探是一项挑战。利用同相和正交分量的等值线确定了研究区域内的灯铁矿区群。通过这项研究,利用实际分量的分析图和一阶垂直导数信号等值线图,可以清楚地确定灯笼岩管道的边界。利用甚低频-电磁伪深度电流密度剖面图确定了异常的灯铁矿、管道及其地下延伸部分以及周围的地层。目前的调查结果表明,灯泡岩具有弱导电性。这些结果为 Dharwar 克拉顿内的勘探工作提供了宝贵的见解,并有助于确定和绘制灯铁矿区。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Geophysical Characterization of Lamproite Fields in the Dharwar Craton Using VLF-EM and Advanced Filtering Techniques: Insights from Conductivity Analysis and Analytical Signal Mapping
This study presents a geophysical investigation of the lamproite fields located in the Dharwar craton, aiming to map conductivity variations using contemporary techniques. The study employs very low-frequency electromagnetic (VLF-EM) methods, applying Hilbert transformations and first-order vertical derivatives to the Fraser and Karous-Hjelt filtered contoured of VLF-EM data. The Peninsular Gneissic Complex (PGC) granitic rocks in the study area experienced tectonic forces, resulting in fractures along specific WNW-ESE to NW-SE trends. Within these crustal weak zones, these lamproites are emplaced. The lamproite pipes are volcanic rocks. Hence, the top portions are weathered and tend to conductive, and the conductivity tend to decreases with the depth. The volumetric size of lamproites ranges from centimetres to hundreds of meters, unlike kimberlites, which are larger. Hence, the exploration of lamproites poses challenges. The contours of in-phase and quadrature components were used to identify the cluster of lamproite zones within the study area. From this study, the boundaries of the lamproite pipes were clearly identified using real component's analytical and first-order vertical derivative signal contour maps. The VLF-EM pseudo depth current density section was used to identify anomalous lamproite, pipes, and their subsurface extensions, along with the surrounding formations. The current investigation findings specify that the lamproites exhibit weak conductive. These results provide valuable insights for exploration efforts within the Dharwar craton, and can aid in the identification and mapping of the lamproite fields.
求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信