Research Article| March 01, 1975 Southeastern Papua: Generation of thick crust in a tensional environment? John Milsom; John Milsom 1287 Jersey Road, Osteley, Middlesex, England Search for other works by this author on: GSW Google Scholar Ian E. Smith Ian E. Smith 2Department of Geology, Australian National University, Canberra, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information John Milsom 1287 Jersey Road, Osteley, Middlesex, England Ian E. Smith 2Department of Geology, Australian National University, Canberra, Australia Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1975) 3 (3): 117–120. https://doi.org/10.1130/0091-7613(1975)3<117:SPGOTC>2.0.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 John Milsom, Ian E. Smith; Southeastern Papua: Generation of thick crust in a tensional environment?. Geology 1975;; 3 (3): 117–120. doi: https://doi.org/10.1130/0091-7613(1975)3<117:SPGOTC>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 extreme southeastern part of the Papuan peninsula is composed mainly of middle Eocene submarine basalt which resembles mid-ocean-ridge tholeiite. During middle Miocene time, the basaltic pile was intruded by potassic rocks, with which pronounced gravity and magnetic anomalies are associated. Although continental rocks have not been found in this area, geophysical data indicate that the crust is of near to normal continental thickness. The uplift of the basalt may be due to differentiation and expansion of the underlying mantle under a tensional regime, and the potassic rocks may be the surface expression of diapirs formed during that differentiation. 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.