Starvatn 173 (Hekla S Tephra) at Starvatn

This search has found 20 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.

Geochemistry

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FeO: total iron is represented as FeO
*original totals for normalised data (where applicable)
	SiO₂	TiO₂	Al₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	Total	EP	Ref
Glass	69.93	0.15	14.90	2.66	0.16	0.13	2.13	3.50	2.21	0.03	95.81	34	5556
Glass	66.80	0.38	14.84	5.85	0.12	0.48	3.23	3.79	2.14	0.08	97.71	34	5556
Glass	66.70	0.42	15.04	5.49	0.11	0.47	3.22	3.94	2.10	0.13	97.61	34	5556
Glass	66.29	0.41	14.95	5.59	0.21	0.47	3.19	3.20	2.00	0.11	96.41	34	5556
Glass	66.17	0.41	15.08	5.92	0.24	0.54	3.36	3.32	2.03	0.09	97.16	34	5556
Glass	65.92	0.40	15.14	5.33	0.19	0.47	3.04	3.31	2.20	0.07	96.07	34	5556
Glass	65.89	0.44	15.09	5.68	0.16	0.52	3.33	3.84	2.00	0.14	97.10	34	5556
Glass	65.67	0.42	14.72	5.77	0.22	0.57	3.32	4.09	1.95	0.12	96.86	34	5556
Glass	65.65	0.45	14.55	5.39	0.12	0.48	3.19	3.37	2.03	0.11	95.31	34	5556
Glass	65.64	0.44	14.74	5.73	0.21	0.55	3.22	3.31	1.96	0.08	95.87	34	5556
Glass	65.48	0.45	15.30	5.86	0.16	0.54	3.39	3.92	2.17	0.12	97.38	34	5556
Glass	65.46	0.45	15.12	5.84	0.17	0.57	3.34	3.95	1.96	0.11	96.96	34	5556
Glass	58.23	1.53	14.74	10.01	0.29	2.08	5.51	3.75	1.48	0.68	98.29	34	5556
Glass	57.54	1.63	13.98	10.83	0.30	2.17	5.47	3.79	1.57	0.79	98.08	34	5556
Glass	56.26	2.10	13.58	10.72	0.36	2.34	5.93	3.83	1.46	0.99	97.56	34	5556
Glass	55.93	2.03	13.62	10.96	0.31	2.34	5.87	3.14	1.42	0.99	96.60	34	5556
Glass	55.69	2.06	13.56	11.27	0.30	2.43	5.97	3.81	1.33	0.99	97.42	34	5556
Glass	55.61	2.06	13.38	11.29	0.18	2.52	6.04	3.15	1.44	0.97	96.63	34	5556
Glass	55.58	2.05	13.60	11.00	0.25	2.35	6.00	3.37	1.39	1.00	96.60	34	5556
Glass	54.62	2.02	13.62	11.05	0.31	2.51	6.02	3.40	1.40	1.10	96.05	34	5556

Instrument Conditions

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

Details of the electron microprobe conditions used to create the above geochemistry. Read the original paper for further details.
EP	Instument	Beam current	Acc. Volt	Sample	Correction	Details
34	Camca SX100 (University of Edinburgh)	10 nA	20 kV	Mounted in epoxy resin and ground and polished	PAP	A rastered beam over an area of 10 Âµm Ã— 10 Âµm was used torm reduce instability of the glass and subsequent sodium loss. For some small shards spot analyses were perfoed (c. 3â€“5 Î¼m) rather than raster analyses.

References

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

5556: Wastegård, S., Rundgren, M., Schoning, K., Anderson, S., Borgmark, A. and Possnert, G. (2008) Age, geochemistry and distribution of the mid-Holocene Hekla-S/Kebister tephra. The Holocene 18(4), 539-549. https://doi.org/10.1177/0959683608089208

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 02:08:54 local time, Edinburgh, Scotland, UK.