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Development of a fracture network in crystalline rocks during weathering: Study of Bishop Creek chronosequence using X-ray computed tomography and 14 C-PMMA impregnation method

2016; Geological Society of America; Volume: 128; Issue: 9-10 Linguagem: Inglês

10.1130/b31336.1

1943-2674

Arnaud Mazurier, Paul Sardini, Ann M. Rossi, Robert C. Graham, Karl-Heinz Hellmuth, Jean‐Claude Parneix, Marja Siitari‐Kauppi, Mikko Voutilainen, Laurent Caner,

Geophysical Methods and Applications

Research Article| September 01, 2016 Development of a fracture network in crystalline rocks during weathering: Study of Bishop Creek chronosequence using X-ray computed tomography and 14C-PMMA impregnation method Arnaud Mazurier; Arnaud Mazurier 1Institut de Chimie des Matériaux et Milieux de Poitiers (IC2MP)/Hydrogéologie, Argiles, Sols et Altérations (HYDRASA), University of Poitiers, 86022 Poitiers Cedex, France2ERM Company, 40 Avenue du Recteur Pineau, 86000 Poitiers Cedex, France Search for other works by this author on: GSW Google Scholar Paul Sardini; Paul Sardini † 1Institut de Chimie des Matériaux et Milieux de Poitiers (IC2MP)/Hydrogéologie, Argiles, Sols et Altérations (HYDRASA), University of Poitiers, 86022 Poitiers Cedex, France †Corresponding author: paul.sardini@univ-poitiers.fr. Search for other works by this author on: GSW Google Scholar Ann M. Rossi; Ann M. Rossi 3Department of Environmental Science and Technology, University of Maryland, College Park, Maryland 20742, USA Search for other works by this author on: GSW Google Scholar Robert C. Graham; Robert C. Graham 4Department of Environmental Science, University of California–Riverside, Riverside, California 92521, USA Search for other works by this author on: GSW Google Scholar Karl-Heinz Hellmuth; Karl-Heinz Hellmuth 5STUK Finish Nuclear Safety Authority, PO Box 14, 00881 Helsinki, Finland Search for other works by this author on: GSW Google Scholar Jean-Claude Parneix; Jean-Claude Parneix 2ERM Company, 40 Avenue du Recteur Pineau, 86000 Poitiers Cedex, France Search for other works by this author on: GSW Google Scholar Marja Siitari-Kauppi; Marja Siitari-Kauppi 6Laboratory of Radiochemistry, Department of Chemistry, University of Helsinki, 00014 Helsinki, Finland Search for other works by this author on: GSW Google Scholar Mikko Voutilainen; Mikko Voutilainen 6Laboratory of Radiochemistry, Department of Chemistry, University of Helsinki, 00014 Helsinki, Finland Search for other works by this author on: GSW Google Scholar Laurent Caner Laurent Caner 1Institut de Chimie des Matériaux et Milieux de Poitiers (IC2MP)/Hydrogéologie, Argiles, Sols et Altérations (HYDRASA), University of Poitiers, 86022 Poitiers Cedex, France Search for other works by this author on: GSW Google Scholar Author and Article Information Arnaud Mazurier 1Institut de Chimie des Matériaux et Milieux de Poitiers (IC2MP)/Hydrogéologie, Argiles, Sols et Altérations (HYDRASA), University of Poitiers, 86022 Poitiers Cedex, France2ERM Company, 40 Avenue du Recteur Pineau, 86000 Poitiers Cedex, France Paul Sardini † 1Institut de Chimie des Matériaux et Milieux de Poitiers (IC2MP)/Hydrogéologie, Argiles, Sols et Altérations (HYDRASA), University of Poitiers, 86022 Poitiers Cedex, France Ann M. Rossi 3Department of Environmental Science and Technology, University of Maryland, College Park, Maryland 20742, USA Robert C. Graham 4Department of Environmental Science, University of California–Riverside, Riverside, California 92521, USA Karl-Heinz Hellmuth 5STUK Finish Nuclear Safety Authority, PO Box 14, 00881 Helsinki, Finland Jean-Claude Parneix 2ERM Company, 40 Avenue du Recteur Pineau, 86000 Poitiers Cedex, France Marja Siitari-Kauppi 6Laboratory of Radiochemistry, Department of Chemistry, University of Helsinki, 00014 Helsinki, Finland Mikko Voutilainen 6Laboratory of Radiochemistry, Department of Chemistry, University of Helsinki, 00014 Helsinki, Finland Laurent Caner 1Institut de Chimie des Matériaux et Milieux de Poitiers (IC2MP)/Hydrogéologie, Argiles, Sols et Altérations (HYDRASA), University of Poitiers, 86022 Poitiers Cedex, France †Corresponding author: paul.sardini@univ-poitiers.fr. Publisher: Geological Society of America Received: 17 Apr 2015 Revision Received: 01 Mar 2016 Accepted: 01 Apr 2016 First Online: 02 Jun 2017 Online Issn: 1943-2674 Print Issn: 0016-7606 © 2016 Geological Society of America GSA Bulletin (2016) 128 (9-10): 1423–1438. https://doi.org/10.1130/B31336.1 Article history Received: 17 Apr 2015 Revision Received: 01 Mar 2016 Accepted: 01 Apr 2016 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Arnaud Mazurier, Paul Sardini, Ann M. Rossi, Robert C. Graham, Karl-Heinz Hellmuth, Jean-Claude Parneix, Marja Siitari-Kauppi, Mikko Voutilainen, Laurent Caner; Development of a fracture network in crystalline rocks during weathering: Study of Bishop Creek chronosequence using X-ray computed tomography and 14C-PMMA impregnation method. GSA Bulletin 2016;; 128 (9-10): 1423–1438. doi: https://doi.org/10.1130/B31336.1 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 SocietyGSA Bulletin Search Advanced Search Abstract The progressive development of porosity during subsoil weathering of granodiorite clasts was studied at the Bishop Creek moraine chronosequence in east-central California. Fractures and other pores were examined using two complementary imaging techniques, X-ray computed tomography (XRCT) and a 14C-PMMA (14C-polymethylmethacrylate) method. The well-known XRCT method allows the investigation of three-dimensional (3-D) pore space. 14C-PMMA is a less-known method based on the complete impregnation of pore space with 14C-doped PMMA, and subsequent autoradiograph of a rock section. These imaging methods allow us to decipher the evolution of pore space in the granodiorite during the 120 k.y. weathering period. The 14C-PMMA imaging technique was found to be more suitable for following the evolution of the whole sequence, from “intact” bedrock to saprock, in terms of crack density, porosity, and aperture. Working with hand specimens, this method was adapted to detect both the low-aperture fractures (microcracks) and macrocracks. Only a slight and progressive increase in total fracture density was observed during the whole weathering period. However, this trend does not hold if macrocracks and microcracks are separated: Microcrack density slightly decreases, whereas macrocrack density increases due to a progressive expansion of microcracks. The total porosity of the rock increases during weathering and is correlated to the progressive aperture increase of all types of cracks. This evolution is accompanied by a change of crack morphology and connectivity, and an overall increase in intragranular porosity of biotite and plagioclase aggregates. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.