Origin of granite-greenstone patterns, Yilgarn Block, Western Australia

Abstract

Research Article| November 01, 1985 Origin of granite-greenstone patterns, Yilgarn Block, Western Australia John S. Myers; John S. Myers 1Geological Survey of Western Australia, 66 Adelaide Terrace, Perth, Western Australia 6000, Australia Search for other works by this author on: GSW Google Scholar Keith P. Watkins Keith P. Watkins 1Geological Survey of Western Australia, 66 Adelaide Terrace, Perth, Western Australia 6000, Australia Search for other works by this author on: GSW Google Scholar Geology (1985) 13 (11): 778–780. https://doi.org/10.1130/0091-7613(1985)13<778:OOGPYB>2.0.CO;2 Article history first online: 01 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 John S. Myers, Keith P. Watkins; Origin of granite-greenstone patterns, Yilgarn Block, Western Australia. Geology 1985;; 13 (11): 778–780. doi: https://doi.org/10.1130/0091-7613(1985)13<778:OOGPYB>2.0.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 The Yilgarn Block of Western Australia consists mainly of Archean granite-greenstone terrain with oval areas of granitoid rocks fringed by arcuate greenstone belts. In a typical part of this terrain the outcrop pattern is shown to result from large-scale dome-and-basin fold interference structures rather than diapiric emplacement of steep-sided batholiths.The greenstones and underlying granitoid rocks were initially deformed together in a subhorizontal tectonic regime. As a result, the granitoid rocks recrystallized and a gneissosity developed subparallel to the stratigraphy of the greenstones. Thick subhorizontal monzogranite sheets were later emplaced into the lower part of the greenstone sequence. Subsequent deformation generated two successive sets of folds with vertical axial surfaces at a high angle to each other. These folds formed dome-and-basin interference structures ranging from a few centimetres to more than 50 km in diameter. 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.