Jökull


Jökull - 01.12.1979, Page 61

Jökull - 01.12.1979, Page 61
TABLE 1. Major element compositions of the main extrusive rock-types of Iceland. THOLEIITIC SERIES TRANSITIONAL ALKALIC SERIES ALKALIC SERIES 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. Si02: 46.21 49.30 60.59 73.23 47.08 47.08 60.52 73.60 46.56 48.46 58.64 TiOz: 0.41 2.28 1.25 0.35 2.33 4.63 1.10 0.20 2.02 3.00 1.41 A1203: 13.69 13.51 15.07 12.25 12.25 12.71 14.98 12.04 15.93 16.40 17.12 Fe^Oj: 1.37 2.34 2.31 3.46 2.46 4.24 2.02 1.26 1.61 3.27 1.93 FeO: 7.16 12.23 5.73 0.81 9.40 11.23 6.89 1.87 10.32 10.10 6.42 MnO: 0.15 0.24 0.19 0.11 0.19 0.22 0.20 0.07 0.20 0.26 0.26 MgO: 18.15 6.34 1.73 0.13 11.70 5.06 1.44 0.05 9.00 3.82 1.16 CaO: 10.99 10.71 4.94 1.87 11.40 9.91 4.69 0.38 10.51 7.71 4.92 Na^O: 1.32 2.46 4.29 4.37 2.13 3.08 4.71 5.74 3.21 5.11 5.02 KjO: 0.01 0.24 1.59 2.53 0.43 0.72 1.68 4.51 0.51 1.19 2.57 P205: 0.02 0.21 0.43 0.02 0.26 0.57 0.45 0.01 0.26 0.62 0.52 H20: 0.19 0.21 1.84 0.25 0.34 0.31 0.59 0.18 0.02 0.06 n.d. Sum: 99.67 100.07 99.96 99.38 99.97 99.76 99.27 99.91 100.15 100.00 99.97 THOLEIITIC SERIES: 1: Oceanite (picrite basalt), Vatnsheidi lava shield, Reykjanes-Langjökull zone, Postglacial. Phenocrysts of chromite, olivine and plagioclase (Jakobsson et al. 1978). 2: Tholeiite, Grindavík fissure lava, Reykjanes-Langjökull zone, Postglacial. Phenocrysts of olivine, plagioclase and augite Qakobsson et al. 1978). 3: Icelandite, Thingmúli central volcano, E-Iceland, Tertiary. Phenocrysts of plagioclase, olivine, ferroaugite and hypersthene (Carmichael 1964). 4: Rhyolite, Jörundur dome, Krafla central volcano, northern volcanic zone, Upper Pleistocene. Phenocrysts of plagioclase, olivine, ferroaugite, magnetite and pigeonite (Wetzel et al. 1978). TRANSITIONAL ALKALIC SERIES: 5: Ankaramite, Eyjafjöll central volcano, eastern volcanic zone, Upper Pleistocene (intrusive?). Phenocrysts of olivine, diopsidic augite, plagioclase and magnetite (Steinthórsson 1964). 6: Transitional alkali basalt, Eldgjá lava, eastern volcanic zone, Postglacial. Phenocrysts of magnetite, plagioclase, olivine and augite (Jakobsson 1979). 7: Transitional andesite, prehistoric Hekla lava, eastern volcanic zone. Phenocrysts of magnetite, plagioclase, olivine, augite and apatite (Jakobsson 1979). 8: Comenditic rhyolite, Hrafntinnusker tholoid, eastern volcanic zone, Postglacial. Aphyric obsidian (Bailey & Macdonald 1970). ALKALIC SERIES: 9: Alkali olivine basalt, 1964 Surtsey lava, Vestmannaeyjar. Phenocrysts of picotite, olivine and plagioclase, (Tilley etal. 1967). 10: Hawaiite, 1973 Eldfell lava, Vestmannaeyjar. Phenocrysts of plagioclase, olivine, magnetite and, kaersutite and hornblende (on nodules) (Jakobsson et al. 1973). 11: Benmoreite, Setberg alkalic suite, Snaefellsnes, Upper Pleistocene. Phenocrysts of plagioclase, olivine, augite and magnetite (Sigurdsson 1970). JÖKULL 29. ÁR 59
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