Jökull

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Jökull - 01.12.1987, Qupperneq 86

Jökull - 01.12.1987, Qupperneq 86
kenni þess var lengi á Gatnabrún (Einar H. Einarsson 1982 bls. 26-27) og einn slíkan fann ég sumarið 1946 vestan í Höttu og vöktu einkenni hans athygli mína. I Ferðabók (1945 bls. 318-319) getur Sveinn Pálsson þess, og hefur eftir Lýði sýslumanni, að steinn einn „sem hljómar með nokkrum hætti líkt og málmur“ og„ sagður óvenju léttur í sér“ sé í heiðum norður af Vík. Þykir líklegt að um sama berg sé að ræða. Margt er enn óka- nnað hvað þetta varðar og því á þessu stigi málsins ekki meira um það að segja. Áður er aðeins vikið að hugsanlegum upptökum þessa öskuflóðs, sem hlýtur að hafa verið með firnum (Jón Jónsson 1986) og slegið fram þeirri spurningu hvort ekki kunni þetta að vera vitnisburður um þau átök, sem í öndverðu skópu Kötlu, sé ég að Kristján Sæmundsson (1982 bls. 235-236) hefur verið inni á slíkri hugmynd. Víst er að enn hefur ekki verið bent á annan stað líklegri. HEIMILDIR: Carswell, D.A. 1982: The volcanic Rocks of the Sólheimajökull Area southern Iceland. Jökull 33:61-71. Einar H. Einarsson, 1982: Súra gjóskubergið á Sólheimum og víðar í Mýrdal. Eldur er í norðri. 17-o28. Sögufélagið. Jón Jónsson, 1986: Eyjafjallapistlar IV. Ársrit Utivistar. Kristján Sæmundsson, 1982: Öskjur á virkum eldfjallasvæðum á íslandi. Eldur er í norðri. 221-239. Sögufélagið. Summary NOTES ON A PAPER BY D.A. CARSWELL IN JÖKULL 33,1983 Jón Jónsson Orkustofnun, Grensásvegi 9, 108 Reykjavík Iceland In a paper entitled: The volcanic Rocks of the Sól- heimajökull Area southern Iceland (Jökull 1983 p. 61- 71) D. A. Carswell describes shortly a peculiar kind of acidic volcanic Rock, found by him in Skógaheiði and provisionallly named „The Ringin Ash“. He stated it to be an ash deposit and derived from a volcanic eruption not far away and probably connected to the Eyjafjöll central volcano. Also Einar H. Einarsson (1982) report- ed the occurence of a similar rock in the area around Sólheimar in Mýrdalur and believed it to be of the same origin. According to investigations by the author of this note, the foramtion can neither be an ash fall deposit nor derived from the Eyjafjöll volcano. This is stated here because of the fact that no traces of this tephra forma- tion is found in the area between the deposits in Skóga- heiði and the Eyjafjöll volcano. Secondly this can not be an ash fall deposit as it contains several pieces of basaltic rock, evidently derived from below the ash. Some of this olde rocks are big boulders more than 100 kg by weight. Accordingly this formation is a pyroclastic flow and seems to be derived from the north-east i.e. in the direction of the Katla volcano in Mýrdalsjökull. Perhaps this pyroclastic flow derives from a huge caldera explo- sion by which the Katla volcano was formed. Investiga- tions by Einar H. Einarsson and the author indicate that this formation has been overrun by at least the two last glaciations in this area. Mynd 3. Bjarg neðst í gjóskulaginu vestan Hofsár, framan til. Fig 3. A boulder in the lower port of the pyroclastic flow. 84
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