Triple junctions as a cause for anomalously near-trench igneous activity between the trench and volcanic arc

Research Article| April 01, 1977 Triple junctions as a cause for anomalously near-trench igneous activity between the trench and volcanic arc R. Stephen Marshak; R. Stephen Marshak 1Department of Geological Sciences, Cornell University, Ithaca, New York 14853 Search for other works by this author on: GSW Google Scholar Daniel E. Karig Daniel E. Karig 1Department of Geological Sciences, Cornell University, Ithaca, New York 14853 Search for other works by this author on: GSW Google Scholar Author and Article Information R. Stephen Marshak 1Department of Geological Sciences, Cornell University, Ithaca, New York 14853 Daniel E. Karig 1Department of Geological Sciences, Cornell University, Ithaca, New York 14853 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1977) 5 (4): 233–236. https://doi.org/10.1130/0091-7613(1977)5<233:TJAACF>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 Email Permissions Search Site Citation R. Stephen Marshak, Daniel E. Karig; Triple junctions as a cause for anomalously near-trench igneous activity between the trench and volcanic arc. Geology 1977;; 5 (4): 233–236. doi: https://doi.org/10.1130/0091-7613(1977)5<233:TJAACF>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 In the eastern Aleutian arc, western Sumatra, and southwestern Japan, the distribution of igneous rocks cannot be explained by direct analogy with the igneous activity in modern island arcs. In these places, episodes of intrusion occurred within the accretionary prism, anomalously close to an active trench. For the eastern Aleutian arc and Sumatra, we speculate that the near-trench igneous rocks could be related to the subduction of a ridge that trended nearly perpendicular to the trench. The ridge-trench-trench triple junction so formed migrated along the trench. As the accretionary prism was under-thrust by the ridge, it would increase the heat flow sufficiently to cause partial melting of the sediment. In Japan, the near-trench igneous rocks could be related to the migration of a trench-trench-trench triple junction along the Japan Trench. The activity associated with this triple junction may be continuing today. 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.