Geosciences Journal最新文献_第5页

Lower Permian limestone associated with ocean floor rocks in the Inthanon Zone of northern Thailand: new evidence for mélange 泰国北部 Inthanon 区与洋底岩石有关的下二叠统石灰岩：混杂的新证据

IF 1.2 4区地球科学

Geosciences Journal Pub Date : 2024-01-16 DOI: 10.1007/s12303-023-0036-3

Kritsada Moonpa, Weerapan Srichan, Thasinee Charoentitirat, Thanpimol Intawong

{"title":"Lower Permian limestone associated with ocean floor rocks in the Inthanon Zone of northern Thailand: new evidence for mélange","authors":"Kritsada Moonpa, Weerapan Srichan, Thasinee Charoentitirat, Thanpimol Intawong","doi":"10.1007/s12303-023-0036-3","DOIUrl":"https://doi.org/10.1007/s12303-023-0036-3","url":null,"abstract":"<p>Scattered outcrops of various lithologies such as limestone, chert, sandstone, mudstone or shale, and microgabbro have been recently exposed in the Hariphunchai Education Center of Chiang Mai University (HECCMU), the northern Lamphun area of the northern Thailand. The outcrops are located in the Inthanon Zone where Palaeo-Tethyan ocean plate stratigraphy is well known. Field and microfacies analysis of limestone blocks recognizes four microfacies interpreted as low-energy lagoon or platform interior and reef flank or shoal of fore-reef. Foraminiferas from the limestone are the Sakmarian (lower Cisuralian) to Kungurian (upper Cisuralian) of the early Permian in age. Field and petrographic analysis of co-occurring radiolarian chert, microgabbro, pelagic mudstone, and turbidites suggest that the limestone blocks were mid-oceanic carbonate build-ups on seamount which were chaotically mixed with oceanic rocks such as chert and gabbro and then embedded in shale matrix. It is concluded that the outcrops are part of mélange formed during the Palaeo-Tethys closure and are significant in representing the Cisuralian (lower Permian) carbonate remnant in the mélange of the Inthanon Zone.</p>","PeriodicalId":12659,"journal":{"name":"Geosciences Journal","volume":"255 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139476079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Source investigation of Ikanje artesian spring in north-central Nigeria, using VLF-EM and VES geophysical techniques 利用 VLF-EM 和 VES 地球物理技术对尼日利亚中北部 Ikanje 自流泉进行泉源调查

IF 1.2 4区地球科学

Geosciences Journal Pub Date : 2024-01-04 DOI: 10.1007/s12303-023-0035-4

{"title":"Source investigation of Ikanje artesian spring in north-central Nigeria, using VLF-EM and VES geophysical techniques","authors":"","doi":"10.1007/s12303-023-0035-4","DOIUrl":"https://doi.org/10.1007/s12303-023-0035-4","url":null,"abstract":"<h3>Abstract</h3> <p>The study is aimed to examine the subsurface fracture system surrounding the Ikanje Artesian spring as regards the water-bearing zones to determine the source of the spring. The area is in a part of the basement complex of southwestern Nigeria. Using the ABEM WADI Very Low Frequency-Electromagnetic (VLF-EM) equipment, 40 profiles were established, 10 on each geographical coordinate at a 5 m inter-station gap, giving a total of 800 station positions. Four resistivity VES points were deployed for correlation purposes. Excel, Fraser Filter, and Karous-Hjelt Filter software were employed for the analysis. The Fraser Filter and Karous-Hjelt plots revealed underlying water-bearing fractures in all directions with prominence toward the south. The trend of the water-bearing fractures that links all the southern profiles indicates that the spring’s source is in the southern area. Inferred 3D conductive maps equally confirmed the highest conductivity in the southern region of the area, indicating wet fractures. The 1D pseudo sections from VES points indicated that the main aquifer linked to Ikanje artesian spring is hosted by a 64.5 m thick fractured basement, overlain by a weathered basement in the SW flank; thus the location could be most suitable for groundwater exploitation.</p>","PeriodicalId":12659,"journal":{"name":"Geosciences Journal","volume":"8 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139094051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-resolution imaging coupled with deep learning model for classifying water body of Soyang Lake, South Korea 高分辨率成像结合深度学习模型对韩国索阳湖水体进行分类

4区地球科学

Geosciences Journal Pub Date : 2023-11-10 DOI: 10.1007/s12303-023-0032-7

Suci Ramayanti, Sungjae Park, Chang-Wook Lee, Yu-Chul Park

引用次数: 0

Interpretation of geometrical characteristics of joints using drill core 用岩心解释接头的几何特征

4区地球科学

Geosciences Journal Pub Date : 2023-11-07 DOI: 10.1007/s12303-023-0034-5

Youjin Jeong, Junghae Choi, Byung-Gon Chae

引用次数: 0

Exploring class imbalance with under-sampling, over-sampling, and hybrid sampling based on Mahalanobis distance for landslide susceptibility assessment: a case study of the 2018 Iburi earthquake induced landslides in Hokkaido, Japan 基于马氏距离的欠抽样、过度抽样和混合抽样的类不平衡滑坡易感性评价研究——以2018年日本北海道伊武里地震诱发滑坡为例