Portal de Periódicos da CAPES

Use of K2O, Rb, Zr, and Y versus SiO2 in volcanic ash layers of the eastern Mediterranean to trace their source

1976; Geological Society of America; Volume: 87; Issue: 1 Linguagem: Inglês

10.1130/0016-7606(1976)87 2.0.co;2

1943-2674

Darlene Richardson, D. Ninkovich,

earthquake and tectonic studies

Research Article| January 01, 1976 Use of K2O, Rb, Zr, and Y versus SiO2 in volcanic ash layers of the eastern Mediterranean to trace their source DARLENE RICHARDSON; DARLENE RICHARDSON 1Lamont-Doherty Geological Observatory of Columbia University, Palisades, New York 10964 Search for other works by this author on: GSW Google Scholar DRAGOSLAV NINKOVICH DRAGOSLAV NINKOVICH 1Lamont-Doherty Geological Observatory of Columbia University, Palisades, New York 10964 Search for other works by this author on: GSW Google Scholar GSA Bulletin (1976) 87 (1): 110–116. https://doi.org/10.1130/0016-7606(1976)87 2.0.CO;2 Article history first online: 01 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 DARLENE RICHARDSON, DRAGOSLAV NINKOVICH; Use of K2O, Rb, Zr, and Y versus SiO2 in volcanic ash layers of the eastern Mediterranean to trace their source. GSA Bulletin 1976;; 87 (1): 110–116. doi: https://doi.org/10.1130/0016-7606(1976)87 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 SocietyGSA Bulletin Search Advanced Search Abstract The two main provinces of Pleistocene tephra eruption in the Mediterranean Sea are the eastern half of the Hellenic arc, represented by calc-alkalic and weakly alkalic material, and the Neapolitan area, represented by high-K2O material.Of twenty distinctive ash layers that have been identified in Pleistocene deep-sea cores of the eastern Mediterranean, one is calc-alkalic ash that originated in the Minoan eruption of Santorini at about 3500 B.P., and another is trachytic ash that originated in the Citara-Serrara eruption on Ischia Island at about 25,000 B.P. Rb, Zr, and Y content has been analyzed in the upper and the lower ash from both the land and deep-sea cores and in three tephra deposits from the east Hellenic volcanoes of Nisyros, Yali, and Kos.In addition to the K2O/SiO2 ratio, values of the trace elements Rb, Zr, and Y versus SiO2 in the ash layers can be used in correlating the ash layers and in tracing the source of ash. All relative K2O, Rb, Zr, and Y contents can be used to trace the source of ash to one of the two main provinces of tephra eruption. Zr and Y are most useful for identifying individual volcanoes as sources.Good agreement of chemical analyses of correlatable samples of the two ash layers from land and deep-sea cores argues against major alteration of the glass shards or a measurable cation exchange between glass shards and sea water on the time scale of 25,000 yr. 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.