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Fault-segment rupture, aftershock-zone fluid flow, and mineralization

2004; Geological Society of America; Volume: 32; Issue: 9 Linguagem: Inglês

10.1130/g20559.1

1943-2682

Steven Micklethwaite, S. F. J. Cox,

High-pressure geophysics and materials

Research Article| September 01, 2004 Fault-segment rupture, aftershock-zone fluid flow, and mineralization Steven Micklethwaite; Steven Micklethwaite 1Research School of Earth Sciences, Australian National University, Canberra ACT 0200, Australia Search for other works by this author on: GSW Google Scholar Stephen F. Cox Stephen F. Cox 2Research School of Earth Sciences, Australian National University, Canberra ACT 0200, Australia, and Department of Earth and Marine Sciences, Australian National University, Canberra ACT 0200, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information Steven Micklethwaite 1Research School of Earth Sciences, Australian National University, Canberra ACT 0200, Australia Stephen F. Cox 2Research School of Earth Sciences, Australian National University, Canberra ACT 0200, Australia, and Department of Earth and Marine Sciences, Australian National University, Canberra ACT 0200, Australia Publisher: Geological Society of America Received: 10 Feb 2004 Revision Received: 14 May 2004 Accepted: 18 May 2004 First Online: 03 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2004) 32 (9): 813–816. https://doi.org/10.1130/G20559.1 Article history Received: 10 Feb 2004 Revision Received: 14 May 2004 Accepted: 18 May 2004 First Online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Steven Micklethwaite, Stephen F. Cox; Fault-segment rupture, aftershock-zone fluid flow, and mineralization. Geology 2004;; 32 (9): 813–816. doi: https://doi.org/10.1130/G20559.1 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 We propose that zones of transient high permeability around ancient fault systems can be predicted if fault segments and likely locations for paleo-rupture arrest are identified. Lode gold deposits in the Kalgoorlie terrane, Western Australia, are the products of focused fluid flow through faulted crust. Deposits in the Mount Pleasant area are clustered on small-displacement structures over ∼10 km of the >50-km-long Black Flag fault. Field relationships and net slip distribution along the fault indicate that the deposits are adjacent to, but not within, a kilometer-scale dilatant jog, where two segments of the fault are linked. On this basis we infer that the dilatant jog was a long-term rupture-arrest site. The observations are compatible with rupture on segments of the Black Flag fault changing stress in the surrounding crust and bringing specific zones closer to failure. By analogy with active seismogenic fault systems, those zones correspond to regions where aftershocks occur preferentially after failure. Stress-transfer modeling of the system helps explain the location of mineralized small- displacement structures around the Black Flag fault and indicates that gold deposits in the area are located on structures that became transiently permeable and localized fluid flow during repeated aftershock ruptures. Thus, localized through-flow, or mixing of fluids within fault systems, is likely to be controlled by the distribution of aftershocks following rupture events; this distribution is predictable. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.