Askja 1875 Tephra at Snidanes

This search has found 18 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	Total	EP	Ref
Glass	73.78	0.82	12.64	3.34	0.13	0.68	2.40	3.38	2.38	99.55	2	1301
Glass	72.84	0.80	12.36	3.10	0.09	0.59	2.09	3.28	2.48	97.63	2	1301
Glass	72.73	0.83	12.47	2.93	0.12	0.60	2.32	3.27	2.45	97.72	2	1301
Glass	72.61	0.70	12.33	3.17	0.16	0.65	2.38	3.45	2.44	97.89	2	1301
Glass	72.55	0.75	12.26	3.23	0.08	0.58	2.12	3.30	2.54	97.41	2	1301
Glass	72.24	0.74	12.16	3.06	0.10	0.62	2.33	3.05	2.56	96.86	2	1301
Glass	72.21	0.77	12.69	3.42	0.09	0.65	2.30	3.18	2.38	97.69	2	1301
Glass	72.20	0.72	12.50	3.30	0.18	0.67	2.30	3.60	2.24	97.71	2	1301
Glass	72.20	0.80	12.52	3.40	0.11	0.69	2.35	3.40	2.32	97.79	2	1301
Glass	72.19	0.84	12.32	3.30	0.14	0.61	2.36	3.58	2.62	97.96	2	1301
Glass	72.14	0.79	12.66	3.23	0.10	0.63	2.29	3.53	2.46	97.83	2	1301
Glass	72.07	0.83	12.30	2.88	0.08	0.53	1.97	3.53	2.56	96.75	2	1301
Glass	72.04	0.79	12.08	3.34	0.09	0.66	2.43	3.35	2.37	97.15	2	1301
Glass	71.93	0.82	12.48	3.43	0.07	0.58	2.23	3.16	2.51	97.21	2	1301
Glass	71.83	0.69	12.58	3.43	0.13	0.67	2.31	3.23	2.34	97.21	2	1301
Glass	71.50	0.76	12.25	3.47	0.10	0.71	2.33	3.64	2.22	96.98	2	1301
Glass	71.35	0.84	12.20	3.44	0.10	0.64	2.39	3.35	2.57	96.88	2	1301
Glass	71.33	0.88	12.72	3.55	0.11	0.70	2.57	3.56	2.36	97.78	2	1301

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
2	Cambridge Instruments Microscan V (University of Edinburgh)	15 nA	20 kV	Thin section mounted in araldite then ground and polished	ZAF	10s peak count per element (2 spectrometers), total electron beam time of 50s and a 5-10um defocussed beam

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.

1301: Larsen, G., Dugmore, A., J. and Newton, A.J. (1999) Geochemistry of historic silicic tephras in Iceland. The Holocene 9(4), 463-471..

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 4/7/2025 at 23:35:51 local time, Edinburgh, Scotland, UK.