Origin and geodynamic implication of the Dupal isotopic anomaly in volcanic rocks from the Philippine island arcs

Research Article| March 01, 1996 Origin and geodynamic implication of the Dupal isotopic anomaly in volcanic rocks from the Philippine island arcs P. R. Castillo P. R. Castillo 1Scripps Institution of Oceanography, La Jolla, California 92093-0220 Search for other works by this author on: GSW Google Scholar Author and Article Information P. R. Castillo 1Scripps Institution of Oceanography, La Jolla, California 92093-0220 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1996) 24 (3): 271–274. https://doi.org/10.1130/0091-7613(1996)024<0271:OAGIOT>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 P. R. Castillo; Origin and geodynamic implication of the Dupal isotopic anomaly in volcanic rocks from the Philippine island arcs. Geology 1996;; 24 (3): 271–274. doi: https://doi.org/10.1130/0091-7613(1996)024<0271:OAGIOT>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 Newly acquired Sr, Nd, and Pb isotope data, combined with other recently available data in the literature, clearly show that Philippine arc volcanic rocks do not have a true Dupal isotopic anomaly. Instead, most of the volcanic rocks must have come from a mantle source with a "Dupal-like" Indian Ocean– to enriched ocean-island-basalt composition. This mantle source is present beneath the Philippine Sea plate and the South China Sea plate on either side of the Philippine arc systems. The isotopic signature of Philippine arc volcanics is most probably inherited from the previous southern locations of the different geologic terranes that compose the modern Philippine island arcs. The new data also show that the isotopic signature of Philippine arc volcanics, similar to volcanic rocks from other western Pacific island-arc–back-arc settings, is mainly a function of the mantle source and was only recently modified by a component from subducted sediments and crust. 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.