All analyses of the Borge-51 Tephra

This search has found 13 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	CaO	Na₂O	K₂O	Total	EP	Ref
Borge (Norway)	glass	74.70	0.33	14.20	1.84	0.39	2.07	4.02	2.12	99.67	17	1958
Borge (Norway)	glass	74.30	0.31	14.29	1.84	0.44	2.17	4.27	1.95	99.56	17	1958
Borge (Norway)	glass	73.74	0.37	14.08	1.82	0.39	2.01	4.40	2.05	98.86	17	1958
Borge (Norway)	glass	71.03	0.37	14.52	2.93	0.13	1.90	4.52	2.55	97.94	17	1958
Borge (Norway)	glass	64.09	1.09	16.10	7.37	1.55	4.66	4.38	1.56	100.78	17	1958
Borge (Norway)	glass	63.64	1.03	16.14	6.89	1.49	4.36	4.56	1.69	99.79	17	1958
Borge (Norway)	glass	63.46	1.00	16.13	6.92	1.48	4.68	4.02	1.57	99.26	17	1958
Borge (Norway)	glass	63.28	1.04	16.25	6.73	1.46	4.68	4.27	1.64	99.36	17	1958
Borge (Norway)	glass	63.13	0.99	16.25	6.97	1.45	4.62	4.20	1.66	99.27	17	1958
Borge (Norway)	glass	62.52	0.98	16.41	6.93	1.41	5.03	4.43	1.44	99.15	17	1958
Borge (Norway)	glass	61.68	0.98	15.69	6.87	1.45	4.58	4.17	1.74	97.16	17	1958
Borge (Norway)	glass	61.58	0.94	15.71	7.05	1.42	4.54	3.73	1.54	96.50	17	1958
Borge (Norway)	glass	60.60	0.86	15.26	6.75	1.52	4.50	4.10	1.62	95.21	17	1958

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
17	Jeol 733 Superprobe (Queens University, Belfast)	10	15	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.

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.

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 07:31:04 local time, Edinburgh, Scotland, UK.