• A cm thick layer of the Saksunarvatn tephra in Lake Skorarvatn indicates that the northern part of the ice cap had reached a similar size as today or was smaller already by Results presented here are part of a research programme to investigate the environmental evolution in central Anatolia during the Pleistocene. (counselingforlife.info)
  • Unconsolidated tephra at El Laco is dominated by hematite along with subsidiary Fe-phosphates, monazite, and silica. (geoscienceworld.org)
  • We suggest here that the El Laco magnetite lavas and magnetite-hematite tephra crystallized from an Fe-P-O-S magma that had separated at depth from a shoshonitic parent magma by liquid immiscibility. (tgdg.net)
  • The stratigraphic evidence includes: (1) as many as six pure lithic ash beds interleaved in sand dunes made of earlier Keanakākoʻi vitric ash, (2) three lava flows from Kīlauea and Mauna Loa interbedded with the tephra, (3) buried syneruptive cultural structures, (4) numerous intraformational water-cut gullies, and (5) abundant organic layers rich in charcoal within the tephra section. (usgs.gov)
  • Pristine ash-sized particles (glass, pumice, scoria, and rock fragments) were handpicked from tephra drilled at ODP Site 782. (pangaea.de)
  • In this study, tephra are used as chronostratigraphical markers between lacustrine sequences studied in cores or in sections surrounding eruptive centres of the Central Anatolian Province. (counselingforlife.info)
  • We infer the former existence of a phosphatic Fe-oxide magma rich in volatiles that underwent explosive degassing and consequent rapid compositional undercooling to produce the observed assemblage of Fe-oxide tephra containing small amounts of Fe-P-REE phosphates and silicate glass. (geoscienceworld.org)
  • Tephra productivity shows variations with time, ranging from 2.0 km 3 /century, during the prehistoric period examined, to 0.7 km 3 /century, during historical time (after 939 CE). (springer.com)
  • Straub, SM (2010): Chorine stable isotope variations in Izu Bonin tephra: Implications for serpentinite subduction. (pangaea.de)
  • The use of tephra layers, which bear their own unique chemistry and character, as temporal marker horizons in archaeological and geological sites is known as tephrochronology. (wikipedia.org)
  • Citations Citations 0 References References Differing provisions from the publisher's actual policy or dating tephra layers agreement may be applicable. (counselingforlife.info)
  • TEPHRA was an influential German band that released their best material from the mid to late 2000s. (blogspot.com)