caa a22 4500 465791832 CHVBK 20180323112027.0 cr unu---uuuuu 170327e19900301xx s 000 0 eng 10.1007/BF00678986 doi (NATIONALLICENCE)springer-10.1007/BF00678986 Evolution of alkalic lavas at Haleakala Volcano, east Maui, Hawaii [Elektronische Daten] Major, trace element and isotopic constraints [C. Chen, F. Frey, M. Garcia] The postshield and posterosional stages of Haleakala Volcano contain intercalated alkalic basalt and evolved alkalic lavas. Isotopic and incompatible element abundance ratios in the Haleakala postshield basalts changed systematically with time, providing evidence for significant temporal changes in the mantle components contributing to the magmatic sources. Specifically, a depleted, i.e. low87Sr/86Sr and high143Nd/144Nd, mantle component is more abundant in younger lavas. However, as magma-production rates decreased during the postshield and posterosional stages, basaltic melts in magma reservoirs cooled and fractionated, leading to evolved residual melts such as hawaiite. Because primary basalt compositions changed with time, the evolved Haleakala lavas formed from a range of parental compositions. However, basalts and evolved lavas of similar age and isotopic ratios (Sr and Nd) have major and trace element contents that are consistent with a crystal-fractionation model. Although alkalic basalt and hawaiite are the dominant lavas of the postshield stages of both Haleakala and Mauna Kea volcanoes, there are important differences between their lavas. For example, compositional differences between the hawaiite suites at Haleakala and Mauna Kea indicate that, on average, the evolved lavas at Haleakala formed at lower pressures. Also, at Haleakala basalts are intercalated with hawaiites, whereas at Mauna Kea basalts and hawaiites are separated by a sharp boundary. These differences probably reflect a higher magma supply rate to the Haleakala volcano. Springer-Verlag, 1990 Chen C. Department of Geology, University of Illinois, 61801, Urbana, IL, USA aut Frey F. Department of Earth, Atmospheric, and Planetary Sciences, MIT, 02139, Cambridge, MA, USA aut Garcia M. Hawaii Institute of Geophysics, University of Hawaii, 96822, Honolulu, HI, USA aut Contributions to Mineralogy and Petrology Springer-Verlag 105/2(1990-03-01), 197-218 0010-7999 105:2<197 1990 105 410 https://doi.org/10.1007/BF00678986 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00678986 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chen C. Department of Geology, University of Illinois, 61801, Urbana, IL, USA aut NATIONALLICENCE 700 1- Frey F. Department of Earth, Atmospheric, and Planetary Sciences, MIT, 02139, Cambridge, MA, USA aut NATIONALLICENCE 700 1- Garcia M. Hawaii Institute of Geophysics, University of Hawaii, 96822, Honolulu, HI, USA aut NATIONALLICENCE 773 0- Contributions to Mineralogy and Petrology Springer-Verlag 105/2(1990-03-01), 197-218 0010-7999 105:2<197 1990 105 410 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer