An Update of the Lithostratigraphy of the Ieper Group
Total Page:16
File Type:pdf, Size:1020Kb
1 Lithostratigraphy Ieper Group 01/2017 An update of the lithostratigraphy of the Ieper Group. Etienne Steurbaut, Marleen De Ceukelaire, Tim Lanckacker, Johan Matthijs, Peter Stassen, Hervé Van Baelen, Noël Vandenberghe To refer to the present document in publications use the following reference : Steurbaut, E. , De Ceukelaire,M., Lanckacker T., Matthijs, J., Stassen, P., Van Baelen H., Vandenberghe, N., 2016. Lithostratigraphy Ieper Group. http://ncs.naturalsciences.be/paleogene‐neogene/ieper‐group. Table of Contents An update of the lithostratigraphy of the Ieper Group. ............................................................ 1 Introduction ............................................................................................................................... 8 Context of the review. ............................................................................................................ 9 The use of geophysical well logs and a compendium of reference logs. ............................. 10 Relationship between lithostratigraphy, bio‐chronostratigraphy and sequence‐ stratigraphy. ......................................................................................................................... 12 IEPER GROUP ............................................................................................................................ 13 Authors: ................................................................................................................................ 13 Description: .......................................................................................................................... 13 Age: ....................................................................................................................................... 14 Regional distribution: ........................................................................................................... 14 Stratotype ............................................................................................................................. 15 Subdivisions ......................................................................................................................... 15 Version january 2017 2 Kortrijk Formation .................................................................................................................... 17 Authors ................................................................................................................................. 17 Description ........................................................................................................................... 17 Stratotype ............................................................................................................................. 17 Area ...................................................................................................................................... 18 Thickness .............................................................................................................................. 18 Members .............................................................................................................................. 18 Age ........................................................................................................................................ 18 Remarks ................................................................................................................................ 18 Het Zoute Member ................................................................................................................... 18 Authors ................................................................................................................................. 18 Description ........................................................................................................................... 18 Regional occurrence and previous name: ............................................................................ 19 The volcanic ash: .................................................................................................................. 19 Stratotype ............................................................................................................................. 19 Mont‐Héribu Member .............................................................................................................. 19 Authors ................................................................................................................................. 19 Description ........................................................................................................................... 20 Regional occurrence and previous names: .......................................................................... 20 Stratotype ............................................................................................................................. 21 Orchies Member ....................................................................................................................... 21 Authors ................................................................................................................................. 21 Description ........................................................................................................................... 21 Regional occurrence and previous names: .......................................................................... 22 Stratotype ............................................................................................................................. 23 Geophysical borehole references and Subdivisions of the Orchies Member ...................... 23 Roubaix Member ...................................................................................................................... 25 Authors ................................................................................................................................. 25 Description ........................................................................................................................... 25 Regional occurrence and previous names: .......................................................................... 26 Stratotype ............................................................................................................................. 26 Geophysical borehole references ........................................................................................ 27 Version january 2017 3 Aalbeke Member ...................................................................................................................... 27 Authors ................................................................................................................................. 27 Description ........................................................................................................................... 27 Regional occurrence and previous names ........................................................................... 28 Stratotype ............................................................................................................................. 28 Geophysical borehole references ........................................................................................ 29 ‘pink silt’ bed ............................................................................................................................ 29 Mons‐en‐Pévèle Formation ...................................................................................................... 29 Authors ................................................................................................................................. 29 On the Formation status: ..................................................................................................... 29 Description : ......................................................................................................................... 30 Regional occurrence and previous names: .......................................................................... 30 Lithological trends and paleogeography: ............................................................................. 31 Stratotype ............................................................................................................................. 32 Geophysical borehole references ........................................................................................ 33 Tielt Formation ......................................................................................................................... 33 On the position of the Egem Member ................................................................................. 33 Tielt Formation ......................................................................................................................... 33 Authors ................................................................................................................................. 33 Description ........................................................................................................................... 33 Stratotype ............................................................................................................................. 34 Area ...................................................................................................................................... 34 Thickness .............................................................................................................................