Chemistry of particles from the Toba ash layer


Autoria(s): Bühring, Christian; Sarnthein, Michael; ODP Leg 184 Shipboard Scientific Pary
Cobertura

MEDIAN LATITUDE: 7.844167 * MEDIAN LONGITUDE: 112.206667 * SOUTH-BOUND LATITUDE: 7.181667 * WEST-BOUND LONGITUDE: 112.081667 * NORTH-BOUND LATITUDE: 8.506667 * EAST-BOUND LONGITUDE: 112.331667 * DATE/TIME START: 1994-05-31T00:00:00 * DATE/TIME END: 1994-05-31T00:00:00

Data(s)

12/04/2000

Resumo

Two cores from the southern South China Sea contain discrete ash layers that mainly consist of rhyolithic glass shards. On the basis of the SPECMAP time scale, the ash layers were dated to ca. 74 ka, the age of the youngest Toba eruption in northern Sumatra. This link is supported by the chemical composition of the glass, which is distinct from volcanic glass supplied from the Philippines and the northern South China Sea, but is almost identical with the chemistry of the Toba ash. The youngest Toba ash layers in the South China Sea expand the previously known ash-fall zone over more than 1800 km to the east. The dispersal of ashes from Sumatra in both western and eastern directions indicates two contrasting wind directions and suggests that (1) the Toba eruption probably happened during the Southeast Asian summer monsoon season, and (2) the volume of erupted magma was larger than previously interpreted.

Formato

application/zip, 2 datasets

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.736631

doi:10.1594/PANGAEA.736631

Idioma(s)

en

Publicador

PANGAEA

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Supplement to: Bühring, Christian; Sarnthein, Michael; ODP Leg 184 Shipboard Scientific Pary (2000): Toba ash layers in the South China Sea: Evidence of contrasting wind directions during eruption ca. 74 ka. Geology, 28(3), 275-278, doi:10.1130/0091-7613(2000)28<275:TALITS>2.0.CO;2

Palavras-Chave #Al2O3; Aluminium oxide; Calcium oxide; CaO; Depth; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Depth bot; Depth top; FeO; GIK/IfG; GIK17961-2; GIK17962-4; Gravity corer (Kiel type); Institute for Geosciences, Christian Albrechts University, Kiel; Iron oxide, FeO; K2O; KOL; Label; Magnesium oxide; Manganese oxide; MgO; MnO; MONITOR MONSUN; Na2O; Ocean Drilling Program; ODP; ODP sample designation; Piston corer (Kiel type); Potassium oxide; Sample code/label; Silicon dioxide; SiO2; SL; SO95; Sodium oxide; Sonne; South China Sea; Sum; TiO2; Titanium oxide; X-ray fluorescence (XRF)
Tipo

Dataset