The Whitehill Formation a high conductivity marker horizon in the Karoo Basin

• DOI: 10.2113/gssajg.110.2-3.465
• Publication Date: 2007-11-26T23:44:00Z
• Authors: T. Branch; O. Ritter; U. Weckmann; R. F. Sachsenhofer; F. Schilling
• Keywords: 550; 550 - Earth sciences; 01 natural sciences; 0105 earth and related environmental sciences

Research Article| September 01, 2007 The Whitehill Formation – a high conductivity marker horizon in the Karoo Basin Thomas Branch; Branch GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Germany AEON-Africa Earth Observatory Network and Department of Geological Sciences, University Cape Town, Rondebosch 7700, South Africa., e-mail: [e-mail] Search for other works by this author on: GSW Google Scholar Oliver Ritter; Ritter Germany, [e-mail] (corresponding author) Ute Weckmann; Weckmann Universität Institut für Geowissenschaften, Karl-Liebknecht-Strasse 24, 14476 [e-mail] Reinhard F. Sachsenhofer; Sachsenhofer Geologie und Lagerstättenlehre am Angewandte Geowissenschaften Geophysik, Montanuniversität, A-8700 Leoben, Austria, [e-mail] Frank Schilling [e-mail] African Journal Geology (2007) 110 (2-3): 465–476. https://doi.org/10.2113/gssajg.110.2-3.465 Article history first online: 09 Mar 2017 Cite View This Citation Add to Manager Share Icon Facebook Twitter LinkedIn MailTo Tools Get Permissions Site Branch, Ritter, Weckmann, Sachsenhofer, Schilling; Basin. 2007;; doi: Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Dropdown Menu input auto suggest filter your All ContentBy SocietySouth Advanced Abstract Within Inkaba yeAfrica project, magnetotelluric (MT) data were acquired along three profiles across Africa. entire its sedimentary sequences are intersected number deep boreholes, which drilled during exploration coal, oil uranium. One most consistent prominent features electrical images is shallow, regionally continuous, sub-horizontal band that seems correlate with Formation. particular known be persistent composition thickness can traced throughout In region our experiments, varies between 50 70 m consists pyritic black shales up 14 weight % carbonaceous matter. Rocks exhibit if electronically conducting minerals, such as graphite, interconnected. To study physical properties maturity carbon present Formation, impedance spectroscopy vitrinite reflectance applied core samples from SA1/66 borehole, taken formation at depth range 2750 2800 m. Vitrinite analysis pseudo-coal shale rocks indicates meta-anthracite field, approaching, one sample, "graphite window". Impedance reveals highest conductivities associated pyrite rich portion showing well above 1 S/m. Recordings on pyrite-poor less conclusive, observed varying few S/m mS/m. Measurements Whilehill hand, show consistently low resistivities 4 6 Ωm. result suggests strongly anomaly MT models linked carbon-rich You do not have access content, please speak institutional administrator you feel should access.