New technique for dating igneous sills

Abstract

Research Article| September 01, 2003 New technique for dating igneous sills James Trude; James Trude 1School of Earth, Ocean, and Planetary Sciences, Cardiff University, Cardiff CF10 3YE, UK Search for other works by this author on: GSW Google Scholar Joe Cartwright; Joe Cartwright 1School of Earth, Ocean, and Planetary Sciences, Cardiff University, Cardiff CF10 3YE, UK Search for other works by this author on: GSW Google Scholar Richard J. Davies; Richard J. Davies 2ExxonMobil Exploration Co., 233 Benmar, Houston, Texas 77060, USA Search for other works by this author on: GSW Google Scholar John Smallwood John Smallwood 3Amerada Hess Ltd., 33 Grosvenor Place, London SW1X 7HY, UK Search for other works by this author on: GSW Google Scholar Geology (2003) 31 (9): 813–816. https://doi.org/10.1130/G19559.1 Article history received: 07 Feb 2003 rev-recd: 07 May 2003 accepted: 12 May 2003 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation James Trude, Joe Cartwright, Richard J. Davies, John Smallwood; New technique for dating igneous sills. Geology 2003;; 31 (9): 813–816. doi: https://doi.org/10.1130/G19559.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Three-dimensional seismic interpretation of Tertiary sills within the northeast Atlantic margin demonstrates that shallow-level (<1 km) intrusion of igneous sills below the seafloor can deform the interface between water and sediment during its early burial stage by hydraulic elevation of the overburden. We show that a group of interconnected sills forcibly "jacked up" the seafloor, contributing to the creation of a minibasin 5 km wide, 250 m deep, and >20 km long. The fill of the minibasin is dated biostratigraphically as 54.6–55 Ma, which fits well with radiometric dates for the timing of intrusion of sills around this basin (ca. 53–55 Ma). The recognition and dating of onlap-fill seismic reflector packages that are delimited by forced folds form a new and useful method for dating shallow-level igneous intrusions in sedimentary basins, a method that provides independent constraints on radiometric dating techniques. Similar forced folds are recognized from other basins that have shallow-level sills, suggesting that the technique presented here may be similarly applicable in comparable geologic settings. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.