- ile/file?db=121121&rid=242&fid=1000001e0198px; width: 770px; perspective-origin: 385px 99px; transform-origin: 385px 99px; font: 12px 微软雅黑; margin: 10px 0px 0px; padding: 0px; " id="UL_12">
- 标题：Detection of undercover karst features by geophysics (ERT) Lascaux cave hill
- 关键词：Karstic morphology,ERT,Geophysics,Geostatistics model
- 作者：Cécile Verdet, Colette Sirieix, Antoine Marache, Joëlle Riss, Jean-Christophe Portais
ile/file?db=121121&rid=242&fid=1df" title="全文下载" style="background-position: 0px -188px; color: rgb(40, 139, 222); display: block; float: left; height: 24px; text-align: center; text-decoration: none solid rgb(40, 139, 222); text-size-adjust: 100%; width: 60px; column-rule-color: rgb(40, 139, 222); perspective-origin: 30px 12px; transform-origin: 30px 12px; caret-color: rgb(40, 139, 222); background: rgba(0, 0, 0, 0) url(https://www1.pconline.com.cn/2015/dl/common/images/bg.png) no-repeat scroll 0px -188px / auto padding-box border-box; border: 0px none rgb(40, 139, 222); border-radius: 3px; font: 12px / 24px \"Microsoft Yahei", tahoma, HELVETICA; list-style: outside none none; margin: 20px 10px 10px; outline: rgb(40, 139, 222) none 0px; " id="A_1">全文下载
内容简介
The study of karst features under a detrital cover is diffificult to obtain using punctual traditional tools. This paper presents a 3D geostatistical modeling of ERT (Electrical Resistivity Tomography) data to describe undercover karst features. A case study was carried out on the karstic site of the prehistoric decorated Lascaux cave (France). Geophysical measurements were used to defifine the limit between outcropping Coniacian or Santonian limestones (southwest) and clayey sands (northeast), with a main orientation of N140°. A geometrical description of the scarp was also constructed; pinnacles and notches were found under the clayey sand detrital formation. By combining 3D ERT with geomorphological and geological observations, the geometry of the stratigraphic limit between the Coniacian and Santonian limestone could be determined. This stratigraphic limit separates two domains, one is a potential aquifer, and acts as a feeder for the intermittent spring at the cave entrance, while the other is less permeable, resulting in a permeability contrast with the later rock type. All these observations help defifine the geological cave environment and ensure better protection for the paintings.
© 2020 Elsevier B.V. All rights reserved.