Late Miocene coesite-eclogite exhumed in the Woodlark Rift

Research Article| September 01, 2008 Late Miocene coesite-eclogite exhumed in the Woodlark Rift Suzanne L. Baldwin; Suzanne L. Baldwin 1Syracuse University, Department of Earth Sciences, Syracuse, New York 13244, USA Search for other works by this author on: GSW Google Scholar Laura E. Webb; Laura E. Webb 1Syracuse University, Department of Earth Sciences, Syracuse, New York 13244, USA Search for other works by this author on: GSW Google Scholar Brian D. Monteleone Brian D. Monteleone 1Syracuse University, Department of Earth Sciences, Syracuse, New York 13244, USA *Current address: School of Earth and Space Exploration, Arizona State University, Tempe, Arizona 85287, USA. Search for other works by this author on: GSW Google Scholar Geology (2008) 36 (9): 735–738. https://doi.org/10.1130/G25144A.1 Article history received: 09 May 2008 rev-recd: 01 Jun 2008 accepted: 04 Jun 2008 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Suzanne L. Baldwin, Laura E. Webb, Brian D. Monteleone; Late Miocene coesite-eclogite exhumed in the Woodlark Rift. Geology 2008;; 36 (9): 735–738. doi: https://doi.org/10.1130/G25144A.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 Late Miocene–Pliocene eclogites were exhumed in the Woodlark Rift of eastern Papua New Guinea, an actively extending region west of the Woodlark Basin seafloor spreading center. We report the discovery of coesite in late Miocene eclogite from the lower plate of one of the D'Entrecasteaux Islands metamorphic core complexes within the Woodlark Rift. Zircon crystallization temperatures (650–675 °C) and 238U/206Pb age (ca. 8 Ma), and rutile thermometry (695–743 °C) combined with garnet-pyroxene thermometry (600–760 °C) and garnet-pyroxene-phengite barometry (18–27 kbar), indicate that the coesite-eclogite was exhumed from mantle depths (≥90 km) to the Earth's surface at plate tectonic rates (cm yr−1). This late Miocene coesite-eclogite is the youngest exhumed ultrahigh-pressure (UHP) rock on Earth, and its preservation ahead of the westward-propagating seafloor spreading center forces reevaluation of models for UHP exhumation, as well as the geologic and tectonic evolution of the Woodlark Rift. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.