All analyses of the Askja-S Tephra

This search has found 59 analyses

The results of your search are shown on this page, which is divided into three sections. The first contains geochemical data in the form of electron probe microanalyses of the the tephra layer you have chosen, which can be downloaded. Most of these analyses will be of glass shards. The second section gives information about the instrument conditions and the third details about the sources of the data and the date and time of your search. You should always refer to the original sources to get the full context of the data presented here.

FeO: total iron is represented as FeO
*original totals for normalised data (where applicable)
Site	Phase	SiO₂	TiO₂	Al₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	Cl	F	Total	EP	Ref
Borge (Norway)	glass	75.91	0.45	12.19	2.72		0.36	1.67	3.52	2.54				99.36	17	1958
Borge (Norway)	glass	75.68	0.33	12.33	2.63		0.28	1.58	3.78	2.56				99.16	17	1958
Borge (Norway)	glass	75.17	0.33	12.39	2.50		0.26	1.68	4.07	2.50				98.89	17	1958
Borge (Norway)	glass	74.97	0.32	12.43	2.58		0.25	1.60	4.03	2.53				98.71	17	1958
Borge (Norway)	glass	74.87	0.31	12.50	2.52		0.24	1.54	3.89	2.58				98.45	17	1958
Borge (Norway)	glass	74.24	0.34	12.15	2.47		0.24	1.57	3.99	2.52				97.51	17	1958
Borge (Norway)	glass	74.22	0.36	12.11	2.60		0.27	1.63	4.05	2.49				97.72	17	1958
Borge (Norway)	glass	73.43	0.34	12.00	2.68		0.25	1.59	3.51	2.31				96.13	17	1958
Borge (Norway)	glass	73.25	0.36	11.97	2.61		0.24	1.57	3.77	2.57				96.32	17	1958
Borge (Norway)	glass	73.05	0.35	12.01	2.46		0.24	1.59	3.63	2.52				95.85	17	1958
Borge (Norway)	glass	71.51	0.25	12.30	3.43		0.09	1.80	3.76	2.42				95.56	17	1958
Hässeldala port (Sweden)	glass	75.05	0.31	12.23	2.54	0.08	0.25	1.63	3.08	2.51				97.67	31	1696
Hässeldala port (Sweden)	glass	75.01	0.29	12.03	2.55	0.09	0.26	1.57	2.89	2.55				97.24	31	1696
Hässeldala port (Sweden)	glass	74.04	0.31	11.88	2.45	0.09	0.27	1.65	3.20	2.47				96.36	31	1696
Hässeldala port (Sweden)	glass	73.86	0.30	11.93	2.53	0.08	0.25	1.54	3.32	2.45				96.27	31	1696
Hässeldala port (Sweden)	glass	72.93	0.33	11.76	2.50	0.07	0.27	1.57	3.44	2.48				95.35	31	1696
Høvdarhagi bog (Faroe Islands)	glass	76.90	0.22	12.62	0.71	0.00	0.04	0.77	6.05	1.12	0.05			98.47	30	3032
Høvdarhagi bog (Faroe Islands)	glass	76.88	0.76	12.73	1.69	0.02	0.03	0.92	5.97	1.41	0.11			100.11	30	3032
Høvdarhagi bog (Faroe Islands)	glass	75.36	0.31	12.13	2.64	0.08	0.26	1.62	4.45	2.64	0.05			99.56	30	3032
Høvdarhagi bog (Faroe Islands)	glass	75.34	0.32	12.38	2.45	0.09	0.28	1.59	4.48	2.51	0.04			99.49	30	3032
Høvdarhagi bog (Faroe Islands)	glass	75.17	0.56	13.03	2.28	0.02	0.02	1.70	5.83	0.56	0.07			99.23	30	3032
Høvdarhagi bog (Faroe Islands)	glass	75.09	0.31	12.04	2.41	0.07	0.26	1.51	4.37	2.52	0.04			98.60	30	3032
Høvdarhagi bog (Faroe Islands)	glass	75.01	0.30	12.12	2.44	0.09	0.29	1.63	4.27	2.47	0.04			98.65	30	3032
Høvdarhagi bog (Faroe Islands)	glass	74.99	0.30	12.12	2.43	0.09	0.28	1.58	4.28	2.61	0.04			98.71	30	3032
Høvdarhagi bog (Faroe Islands)	glass	74.72	0.31	12.19	2.43	0.08	0.23	1.62	4.44	2.62	0.05			98.69	30	3032
Høvdarhagi bog (Faroe Islands)	glass	74.54	0.61	13.39	2.08	0.03	0.04	1.38	6.52	0.62	0.05			99.25	30	3032
Høvdarhagi bog (Faroe Islands)	glass	74.13	0.30	11.97	2.44	0.09	0.24	1.77	4.59	2.69	0.04			98.26	30	3032
Høvdarhagi bog (Faroe Islands)	glass	74.10	0.30	12.53	2.48	0.08	0.26	1.73	4.42	2.63	0.04			98.58	30	3032
Høvdarhagi bog (Faroe Islands)	glass	73.96	0.30	11.66	2.33	0.09	0.25	1.54	4.32	2.41	0.05			96.91	30	3032
Høvdarhagi bog (Faroe Islands)	glass	73.77	0.30	11.82	2.63	0.09	0.24	1.58	4.42	2.49	0.05			97.38	30	3032
Høvdarhagi bog (Faroe Islands)	glass	73.73	0.28	15.15	1.20	0.00	0.00	1.79	6.55	1.03	0.03			99.76	30	3032
Høvdarhagi bog (Faroe Islands)	glass	73.53	0.30	12.02	2.57	0.10	0.26	1.64	4.26	2.44	0.04			97.15	30	3032
Høvdarhagi bog (Faroe Islands)	glass	73.44	0.30	11.81	2.48	0.10	0.25	1.59	4.44	2.51	0.05			96.96	30	3032
Høvdarhagi bog (Faroe Islands)	glass	73.21	0.30	11.36	2.42	0.09	0.23	1.69	4.24	2.55	0.04			96.11	30	3032
Høvdarhagi bog (Faroe Islands)	glass	72.75	0.30	11.73	2.69	0.08	0.27	1.72	4.45	2.66	0.06			96.69	30	3032
Høvdarhagi bog (Faroe Islands)	glass	72.35	0.30	11.75	2.62	0.10	0.23	1.60	4.21	2.48	0.04			95.67	30	3032
Høvdarhagi bog (Faroe Islands)	glass	72.06	0.27	11.54	2.37	0.08	0.21	1.43	4.02	2.53	0.05			94.55	30	3032
Høvdarhagi bog (Faroe Islands)	glass	71.34	0.29	11.54	2.36	0.09	0.25	1.57	3.68	2.34	0.04			93.50	30	3032
Høvdarhagi bog (Faroe Islands)	glass	70.94	0.29	11.39	2.52	0.08	0.26	1.42	4.21	2.52	0.05			93.68	30	3032
Inverlair (Scotland)	glass	74.09	0.34	12.01	2.46	0.08	0.24	1.63	4.20	2.53				97.57	22	4684
Inverlair (Scotland)	glass	73.06	0.27	11.71	2.49	0.08	0.25	1.59	4.46	2.46				96.36	22	4684
Inverlair (Scotland)	glass	70.64	0.26	11.57	2.44	0.09	0.22	1.54	4.10	2.46				93.31	22	4684
Inverlair (Scotland)	glass	70.41	0.28	11.47	2.35	0.00	0.25	1.42	3.93	2.43				92.55	22	4684
Lake Czechowskie (Poland)	glass	76.11	0.28	12.13	2.49	0.10	0.26	1.54	3.53	2.49	0.00	0.06	0.00	98.93	26	4822
Lake Czechowskie (Poland)	glass	75.75	0.32	12.17	2.38	0.08	0.22	1.49	3.44	2.49	0.04	0.04	0.00	98.37	26	4822
Lake Czechowskie (Poland)	glass	75.75	0.31	12.24	2.53	0.09	0.23	1.58	3.79	2.39	0.01	0.05	0.00	98.91	26	4822
Lake Czechowskie (Poland)	glass	75.70	0.26	12.25	2.59	0.13	0.28	1.60	3.85	2.48	0.04	0.06	0.00	99.19	26	4822
Lake Czechowskie (Poland)	glass	75.52	0.32	12.01	2.45	0.06	0.23	1.53	3.83	2.55	0.04	0.04	0.00	98.54	26	4822
Lake Czechowskie (Poland)	glass	74.40	0.31	11.92	2.51	0.08	0.26	1.54	3.81	2.51	0.01	0.05	0.00	97.35	26	4822
Lake Czechowskie (Poland)	glass	74.38	0.29	11.94	2.43	0.09	0.22	1.54	3.07	2.52	0.01	0.04	0.00	96.49	26	4822
Lake Czechowskie (Poland)	glass	74.24	0.34	12.10	2.48	0.07	0.22	1.52	4.00	2.40	0.06	0.05	0.00	97.42	26	4822
Lake Czechowskie (Poland)	glass	74.21	0.28	11.86	2.48	0.06	0.21	1.56	3.80	2.47	0.10	0.04	0.00	97.03	26	4822
Lake Czechowskie (Poland)	glass	74.04	0.31	12.43	2.60	0.10	0.23	1.58	3.49	2.40	0.02	0.03	0.00	97.21	26	4822
Lake Czechowskie (Poland)	glass	74.02	0.29	11.90	2.57	0.09	0.25	1.57	3.77	2.49	0.05	0.06	0.00	97.01	26	4822
Lake Czechowskie (Poland)	glass	73.25	0.33	11.76	2.43	0.07	0.23	1.52	3.87	2.45	0.05	0.03	0.00	95.96	26	4822
Lake Czechowskie (Poland)	glass	73.20	0.27	11.72	2.38	0.06	0.24	1.52	3.75	2.52	0.06	0.04	0.00	95.71	26	4822
Tiefer See (Germany)	glass	75.80	0.32	12.12	2.48	0.10	0.25	1.62	3.40	2.44	0.00	0.05	0.00	98.53	26	4822
Tiefer See (Germany)	glass	74.50	0.29	11.83	2.51	0.11	0.22	1.60	3.16	2.31	0.02	0.06	0.00	96.55	26	4822
Tiefer See (Germany)	glass	73.37	0.28	11.80	2.41	0.09	0.25	1.53	3.21	2.44	0.00	0.05	0.00	95.38	26	4822

Instrument Conditions

These analyses were carried out under the following electron microprobe conditions.

Please refer to papers for full details of the instrument conditions, standards etc used to create these analyses
EP	Instrument	Beam current (nA)	Beam voltage (kV)	Correction	Sample
17	Jeol 733 Superprobe (Queens University, Belfast)	10	15	ZAF	Thin section mounted in araldite then ground and polished
22	JEOL 8800 Electron Microprobe (University of Oxford)	10	15	ZAF	Mounted in epoxy resin and ground and polished
26	JEOL JXA-8230 microprobe (German Research Centre for Geosciences, GFZ)	10	15		Embedded in Araldite 2020 resin in a single-hole-stub, then sectioned and polished by hand on wet silicon carbide paper
30	Camca SX100 (University of Edinburgh)		15	PAP	Mounted in epoxy resin and ground and polished
31	Cambridge Instruments Microscan V (University of Edinburgh)	15	20	ZAF	Thin section mounted in araldite then ground and polished

References

The data on this page is from the following source(s). If you use this data please acknowledge the source of the data. he number preceeding each reference matches the Ref number on the data table above.

1696 - Davies, S.M., Wastegard, S. and Wohlfarth, B. (2003) Extending the limits of the Borrobol Tephra to Scandinavia and detection of new early Holocene tephras. Quaternary Research 59, 345-352..

4684 - Kelly, T.J., Hardiman, M., Lovelady, M., Lowe, J.J., Matthews, I.P. and Blockley, S.P.E. (2017) Scottish early Holocene vegetation dynamics based on pollen and tephra records from Inverlair and Loch Etteridge, Inverness-shire. Proceedings of the Geologists Association 128, 125-135.

3032 - Lind, EM and Wastegard, S (2011) Tephra horizons contemporary with short early Holocene climate fluctuations: New results from the Faroe Islands. Quaternary International 246, ,157-167.

1958 - Pilcher, J., Bradley, R. S., Francus, P. and Anderson, L. (2005) A Holocene tephra record from the Lofoten Islands, Arctic Norway. Boreas 34, 136-156.

4822 - Wulf, S. Dräger, N. Ott, F. Serb, J. Appelt, O. Guðmundsdóttir, E. van den Bogaard, C. Slowinski, M. Laszkiewicz, M. and Brauder, A. (2016) Holocene tephrostratigraphy of varved sediment records from Lakes Tiefer See (NE Germany) and Czechowskie (N Poland). Journal of Quaternary Science 32, 1-14.

Data Sources

All of the data contained in this database is either published or donated. When using the data, acknowledgement must be made of the original source of the data and that the data was obtained from Tephrabase. See Copyright information.

This Tephrabase search was made on 5/7/2025 at 07:18:44 local time, Edinburgh, Scotland, UK.