caa a22 4500 47582623X CHVBK 20180406123829.0 cr unu---uuuuu 170329e20001101xx s 000 0 eng 10.1007/s004450000091 doi (NATIONALLICENCE)springer-10.1007/s004450000091 Rejuvenated volcanism along the southwest rift zone, East Maui, Hawai‘i [Elektronische Daten] [Eric C. Bergmanis, John M. Sinton, Frank A. Trusdell] Abstract.: East Maui Volcano is the younger and larger of two volcanoes that form the island of Maui, Hawai‘i. Rejuvenated stage (Hāna volcanics) lava flows along the southwest rift zone form a veneer lying disconformably on top of the postshield Kula Volcanics (0.93-~0.36Ma). Most of the 59 documented Hāna eruptions produced ‘a‘ā flows from large cinder cones. Fourteen new 14C ages and stratigraphic relationships suggest that the onset of rejuvenated volcanism on the southwest rift zone began at least 50ka, showing that the quiescent period between the postshield and rejuvenated stage on East Maui was ~300,000years long, the shortest yet documented on any Hawaiian volcano. Eruption frequency on the southwest rift zone steadily increased during the past ~4800years; there have been at least six eruptions within the past ~960years. Hāna volcanic activity on the southwest rift zone during the past ~4800years may have occurred in three episodes, each lasting as long as 1000years separated by quiescent periods ~500-800years long. Geochemical data, ages, and geologic relations provide evidence for five multi-flow sequences that were erupted during single events, helping to define the eruptive character or style of rejuvenation stage volcanic activity on the southwest rift zone. Areas covered by the products of individual eruptions vary from 0.14 to ~40km2, and volumes from 0.0003 to 0.40km3. Geochemical evidence shows that the Hāna lavas are derived from a small range of parental melts that undergo varying degrees of fractional crystallization. MELTS crystallization simulations suggest that Hāna magmatic evolution occurs at a pressure of ~3kbar (~10-11km depth), just above the interface between the volcanic edifice and the oceanic plate. The Hāna volcanics are unique among Hawaiian rejuvenation suites in having been erupted along rift zones with a relatively high eruption frequency from a quasi-steady-state, deep crustal magma reservoir. Springer-Verlag, 2000 Rejuvenated volcanism Alkalic lavas Hawai‘i Radiocarbon dating nationallicence Bergmanis Eric C. Department of Geology and Geophysics, University of Hawai‘i at Mānoa, Honolulu, Hawai‘i 96822, USA aut Sinton John M. Department of Geology and Geophysics, University of Hawai‘i at Mānoa, Honolulu, Hawai‘i 96822, USA aut Trusdell Frank A. U.S. Geological Survey, Hawaiian Volcano Observatory, Hawai‘i National Park, Hawai‘i 96718, USA aut https://doi.org/10.1007/s004450000091 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s004450000091 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bergmanis Eric C. Department of Geology and Geophysics, University of Hawai‘i at Mānoa, Honolulu, Hawai‘i 96822, USA aut NATIONALLICENCE 700 1- Sinton John M. Department of Geology and Geophysics, University of Hawai‘i at Mānoa, Honolulu, Hawai‘i 96822, USA aut NATIONALLICENCE 700 1- Trusdell Frank A. U.S. Geological Survey, Hawaiian Volcano Observatory, Hawai‘i National Park, Hawai‘i 96718, USA aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer