Geochemistry and tectonic setting of the Luzon arc, Philippines

Research Article| May 01, 1989 Geochemistry and tectonic setting of the Luzon arc, Philippines MARC J. DEFANT; MARC J. DEFANT 1Department of Geology, University of South Florida, Tampa, Florida 33620 Search for other works by this author on: GSW Google Scholar DARIO JACQUES; DARIO JACQUES 2Laboratoire de Petrologie et G.S. Oceanologie et Geodynamique, Universite de Bretagne Occidentale, 29287 Brest, France Search for other works by this author on: GSW Google Scholar RENE C. MAURY; RENE C. MAURY 2Laboratoire de Petrologie et G.S. Oceanologie et Geodynamique, Universite de Bretagne Occidentale, 29287 Brest, France Search for other works by this author on: GSW Google Scholar JELLE DE BOER; JELLE DE BOER 3Department of Earth and Environmental Sciences, Wesleyan University, Middletown, Connecticut 06457 Search for other works by this author on: GSW Google Scholar JEAN-LOUIS JORON JEAN-LOUIS JORON 4Groupe des Sciences de la Terre, Laboratoire Pierre Siie, Centre d'Etudes Nucleaires de Saclay, B.P. 2, 91191 Gif sur Yvette, France Search for other works by this author on: GSW Google Scholar Author and Article Information MARC J. DEFANT 1Department of Geology, University of South Florida, Tampa, Florida 33620 DARIO JACQUES 2Laboratoire de Petrologie et G.S. Oceanologie et Geodynamique, Universite de Bretagne Occidentale, 29287 Brest, France RENE C. MAURY 2Laboratoire de Petrologie et G.S. Oceanologie et Geodynamique, Universite de Bretagne Occidentale, 29287 Brest, France JELLE DE BOER 3Department of Earth and Environmental Sciences, Wesleyan University, Middletown, Connecticut 06457 JEAN-LOUIS JORON 4Groupe des Sciences de la Terre, Laboratoire Pierre Siie, Centre d'Etudes Nucleaires de Saclay, B.P. 2, 91191 Gif sur Yvette, France Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1989) 101 (5): 663–672. https://doi.org/10.1130/0016-7606(1989)101<0663:GATSOT>2.3.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation MARC J. DEFANT, DARIO JACQUES, RENE C. MAURY, JELLE DE BOER, JEAN-LOUIS JORON; Geochemistry and tectonic setting of the Luzon arc, Philippines. GSA Bulletin 1989;; 101 (5): 663–672. doi: https://doi.org/10.1130/0016-7606(1989)101<0663:GATSOT>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 SocietyGSA Bulletin Search Advanced Search Abstract Miocene (10 Ma) to Recent volcanism is associated with eastward subduction along the Manila Trench for some 1,200 km from the Coastal Range in Taiwan south to Min-doro. We suggest calling this the "Luzon arc.". There are five distinct segments along this arc: Mindoro, Bataan, Northern Luzon, Babuyan, and Taiwan. The Bataan and Mindoro segments in the south are separated by a northeast-southwest zone of volcanoes. The Northern Luzon segment consists of Pliocene to Pleistocene necks and plugs that run along the entire western section of Northern Luzon. The Babuyan segment (10 Ma to Recent) is made up of a larger number of active volcanoes than are other segments of the Luzon arc. The Taiwan segment is composed entirely of extinct volcanoes in the Coastal Range and on the islands of Lanhsu and Lutao (late Miocene to 1.8 Ma).The nature of volcanism throughout the Luzon are is clearly subduction related with calc-alkaline affinities; high Th/La ratios; and negative Nb, Ta, and Ti anomalies. The earliest phase of volcanism so far recorded (10 Ma), however, is tholeiitic (island of Calayan in the Babuyan segment) with mid-oceanic-ridge basalt-like (MORB-like) tight-rare-earth element and large-ion lithophile element concentrations and low Th/U ratios.There are clear differences in Sr and Nd isotopic ratios among the samples from the Luzon are. Samples from the southern segments (Mindoro through Bataan) fall within the mantle array, with higher Sr and lower Nd isotopic values than those of MORB. Pb isotope data indicate sediment involvement. The isotopic values have been interpreted to result from source contamination by slab-derived fluids (Bataan segment) and by subducted crustal material from collision of the Mindoro-Palawan terrane (Mindoro segment) with the Manila Trench. In contrast, Babuyan segment samples (north) have unusual island-arc Nd and Sr isotopic ratios that fall below the mantle array; they appear to be the result of sediment source contaminants or a unique mantle composition. Incorporation of sediments analyzed from eastern China and Taiwan into a MORB-type mantle can explain the Nd and Sr isotopic ratios of the Babuyan segment. 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.