Intracrustal detachments and implications for crustal evolution within the Lachlan fold belt, southeastern Australia

Abstract

Research Article| June 01, 1991 Intracrustal detachments and implications for crustal evolution within the Lachlan fold belt, southeastern Australia D. R. Gray; D. R. Gray 1Department of Earth Sciences, Monash University, Melbourne 3168, Australia Search for other works by this author on: GSW Google Scholar C.J.L. Wilson; C.J.L. Wilson 2School of Earth Sciences, University of Melbourne, Melbourne 3052, Australia Search for other works by this author on: GSW Google Scholar T. J. Barton T. J. Barton 3Bureau of Mineral Resources, Canberra, A.C.T. 2601, Australia Search for other works by this author on: GSW Google Scholar Geology (1991) 19 (6): 574–577. https://doi.org/10.1130/0091-7613(1991)019<0574:IDAIFC>2.3.CO;2 Article history 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 D. R. Gray, C.J.L. Wilson, T. J. Barton; Intracrustal detachments and implications for crustal evolution within the Lachlan fold belt, southeastern Australia. Geology 1991;; 19 (6): 574–577. doi: https://doi.org/10.1130/0091-7613(1991)019<0574:IDAIFC>2.3.CO;2 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 Seismic reflection profiling in the southern Lachlan fold belt, Australia, indicates geometrically complex mid- to lower crustal detachments possibly associated with crustal thickening by tectonic underplating of collided microplates and/or oceanic plateaus. Low-angle detachments either intersect or sole into the crust-mantle boundary, forming a crustal-stacking wedge typical of lithospheric- or A-type subduction. Upper crustal reflections show that major, moderately to steeply dipping reverse faults exposed at the surface flatten with depth and have listric form. The chevron-folded quartz-rich turbidite sequence of the Lachlan fold belt is therefore allochthonous with respect to the lower crust. Like the northern Appalachian maritimes, the Lachlan fold belt has a composite crust with diverse lower crustal blocks overlain by allochthonous, imbricated terranes of the surface rocks. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.