All analyses of the Tjørnuvík A Tephra

This search has found 28 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	Total	EP	Ref
Eiði (Faroe Islands)	glass	75.94	0.11	13.35	1.90	0.08	0.05	1.37	3.48	2.81	99.09	2	1454
Eiði (Faroe Islands)	glass	75.90	0.10	12.54	1.53	0.13	0.07	1.36	4.31	2.89	98.83	2	1454
Eiði (Faroe Islands)	glass	74.22	0.11	13.16	1.90	0.05	0.04	1.43	3.99	2.83	97.73	2	1454
Eiði (Faroe Islands)	glass	73.54	0.11	12.66	1.85	0.07	0.05	1.37	3.72	2.98	96.35	2	1454
Eiði (Faroe Islands)	glass	73.49	0.11	12.54	1.71	0.26	0.12	1.34	3.83	2.93	96.33	2	1454
Eiði (Faroe Islands)	glass	73.38	0.07	13.12	1.98	0.09	0.05	1.34	3.89	2.82	96.74	2	1454
Eiði (Faroe Islands)	glass	73.05	0.07	13.05	1.91	0.10	0.06	1.36	3.67	2.68	95.95	2	1454
Eiði (Faroe Islands)	glass	72.99	0.11	12.68	1.78	0.10	0.04	1.30	3.60	2.80	95.40	2	1454
Eiði (Faroe Islands)	glass	72.74	0.22	14.00	3.07	0.12	0.15	1.85	4.20	2.91	99.26	2	1454
Eiði (Faroe Islands)	glass	72.19	0.17	12.90	2.06	0.05	0.05	1.37	3.92	2.68	95.39	2	1454
Eiði (Faroe Islands)	glass	71.98	0.28	12.95	2.52	0.12	0.43	1.83	3.64	2.61	96.36	2	1454
Eiði (Faroe Islands)	glass	71.75	0.23	13.80	3.02	0.07	0.14	1.85	4.13	2.70	97.69	2	1454
Eiði (Faroe Islands)	glass	71.67	0.22	13.73	2.93	0.10	0.13	1.80	3.98	2.67	97.23	2	1454
Eiði (Faroe Islands)	glass	71.36	0.17	13.29	2.41	0.12	0.04	1.81	4.12	2.59	95.91	2	1454
Eiði (Faroe Islands)	glass	67.73	0.48	15.12	5.61	0.17	0.55	3.32	3.23	2.03	98.24	2	1454
Eiði (Faroe Islands)	glass	67.64	0.40	14.92	5.35	0.16	0.52	3.25	2.99	1.97	97.20	2	1454
Eiði (Faroe Islands)	glass	66.71	0.39	14.71	5.47	0.16	0.65	3.37	3.66	1.89	97.01	2	1454
Eiði (Faroe Islands)	glass	66.42	0.43	14.74	5.22	0.13	0.52	3.21	3.99	2.11	96.77	2	1454
Eiði (Faroe Islands)	glass	66.39	0.49	14.49	7.47	0.26	0.35	3.85	4.12	1.92	99.34	2	1454
Eiði (Faroe Islands)	glass	65.64	0.55	14.46	7.32	0.26	0.37	3.75	4.12	1.92	98.39	2	1454
Eiði (Faroe Islands)	glass	65.05	0.38	14.67	5.31	0.15	0.51	3.15	4.08	1.92	95.22	2	1454
Tjørnuvík (Faroe Islands)	glass	74.60	0.09	13.04	2.10	0.10	0.09	1.31	4.00	2.80	98.13	2	1458
Tjørnuvík (Faroe Islands)	glass	73.50	0.13	13.09	2.07	0.10	0.08	1.34	3.97	2.82	97.10	2	1458
Tjørnuvík (Faroe Islands)	glass	73.45	0.14	12.99	1.93	0.10	0.08	1.36	4.26	2.92	97.23	2	1458
Tjørnuvík (Faroe Islands)	glass	72.16	0.09	12.86	2.03	0.09	0.03	1.14	4.21	2.74	95.35	2	1458
Tjørnuvík (Faroe Islands)	glass	67.20	0.45	15.00	5.62	0.20	0.58	3.26	4.41	2.01	98.73	2	1458
Tjørnuvík (Faroe Islands)	glass	65.26	0.39	14.47	5.48	0.21	0.56	2.97	4.11	2.07	95.52	2	1458
Tjørnuvík (Faroe Islands)	glass	65.15	0.38	13.85	6.50	0.21	0.24	3.58	3.51	1.99	95.41	2	1458

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	Beam	Sample	Comments
2	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.

1458 - Hannon, G.E., Hermanns-Audardottir, M. and Wastegard, S. (1998) Human impact at Tjornuvik in the Faroe Islands. Frodskaparrit 46, 215-228..

1454 - Wastegard, S., Bjorck, S., Grauert, M. and Hannon, G.E. (2001) The Mjauvotn tephra and other Holocene tephra horizons from the Faroe Islands: a link between the Icelandic source region, the Nordic Seas, and the European continent. The Holocene 11(1), 101-109..

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 07:26:21 local time, Edinburgh, Scotland, UK.