Náttúrufræðingurinn

Volume

Náttúrufræðingurinn - 1984, Page 53

Náttúrufræðingurinn - 1984, Page 53
TAFLA I. Efnasamsetning nornahára (prósent af þyngd) — Chemical composition of Pele’s hairs. I II III IV sío2 50.5 47.6 50.1 67.0 Ti02 1.67 2.33 3.10 1.53 AL03 14.0 14.6 13.2 14.5 FeO’ 11.8 11.6 14.9 6.57 MnO 0.22 0.21 0.25 0.26 MgO 7.00 6.81 5.44 1.35 CaO 11.3 12.6 10.3 3.61 NazO 2.19 2.81 2.70 1.31 k2o 0.20 0.37 0.41 2.73 P2O5 0.17 0.22 0.33 0.37 Alls/Total 99.05 99.15 100.73 99.23 I. Krafla, nornahár myndað í gosinu 18.—23. nóvember 1981. Safnað við Leirhnúk 21. nóvember 1981. — Pele’s hair from the Krafla eruption 21. 11. 1981. II. Surtsey, nornahár myndað í ágúst 1966. Safnað 21. ágúst 1966. — Pele’s hair from Surtsey, 21. 8. 1966. III. Lakagígar, nornahár myndað í Skaftáreldagosi 1783. Safnað úr gjóskulaginu skammt frá Laka. — Pele’s hair from the Laki eruption, 1783. IV. Efra nálalagið, sýni tekið úr jarðvegssniði á norðanverðum Mýrdalssandi. Eldstöðin er óþekkt, en dreifingarmynstur gjóskuiagsins bendir til Mýrdalsjökuls eða næsta nágrennis, aldur þess er forsögulegur. — Needle-shaped tephra grains from the prehistoric upper needle-layer in the vicinity of Katla. SE-lceland. Efnagreiningar voru famkvæmdar á örgreini Norrænu eldfjallastöðvarinnar. - Micro- probe analyses were made at the Nordic Volcanological Institute, Reykjavík. HEIMILDIR Duffield, W. A., E. K. Gibson & G. H. Heiken. 1977. Some characteristics of Pele’s hair. — J. Res. U. S. Geol. Survey 5, 1: 93—101. EOS, 1980. SEM photograph of a strand of Pele’s hair (photo by B. R. Frost). - Trans. Am. Geophys. Union, Vol. 61, No. 29 (cóver). Guðrún Larsen. 1978. Gjóskulög í ná- grenni Kötlu. — Ritgerð til 4. árs prófs í jarðfræði við Háskóla íslands. Reykja- vík: 60 bls. Heiken, G. 1974. An atlas of volcanic ash. — Smiths. Contr. Earth Sci. 12: 101 bls. Isard, J. O. 1971. The formation of spheri- cal glass particles on the lunar surface. — Sec. Lunar Sci. Conf. Proc. Geoc- him. et Cosmichim. Acta, Suppl. 3, 3: 2003-2008. Macdonald, G. M. 1972. Volcanoes. — Prentice-Hall, Inc., U. S. A.: 510 bls. Sasaki, T., Y. Katsui & S. Kumano. 1981. Felsic Pele’s hairs produced by pumice eruptions. - Bull. Volc. Soc. Japan 26, 2: 113-116. Sigurður Þórarinsson. 1963. Eldur í Öskju. — Almenna bókafélagið, Reykjavík: 91 bls. 143
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