Tephrabase

This search has found 8 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	72.94	0.74	12.49	3.14	0.12	0.63	2.28	3.94	2.53	0.15	98.96	27	2340
Glass	72.42	0.82	12.43	3.10	0.09	0.56	2.09	4.08	2.45	0.16	98.20	27	2340
Glass	72.19	0.82	12.62	3.24	0.15	0.64	2.33	4.13	2.34	0.13	98.60	27	2340
Glass	71.15	0.85	12.92	3.83	0.13	0.78	2.66	4.15	2.29	0.22	98.96	27	2340
Glass	70.69	0.82	12.33	3.50	0.15	0.72	2.41	4.07	2.23	0.19	97.11	27	2340
Glass	70.63	0.79	12.65	3.56	0.12	0.69	2.44	4.12	2.43	0.18	97.62	27	2340
Glass	69.89	0.87	12.81	4.22	0.08	0.80	2.76	3.98	2.23	0.23	97.86	27	2340
Glass	69.81	0.74	12.07	3.31	0.10	0.68	2.28	3.92	2.29	0.17	95.37	27	2340

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
27	Camca SX100 (University of Edinburgh)	10 nA	15 kV	Thin section mounted in araldite then ground and polished	PAP	Beam diameter rastered over 10 um. For small shards a beam current of 5 nA and beam diameter of 5 m was used. Counting times on the peak of each element were restricted to 10 s. Sodium was measured in the first counting period.

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.

2340: Davies, S.M., Elmquist, M., Bergman, J., Wohlfarth, B. and Hammarlund, D. (2007) Cryptotephra sedimentation processes within two lacustrine sequences from west central Sweden. Holocene 17, 319-330. https://doi.org/10.1177/0959683607076443

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 22:54:14 local time, Edinburgh, Scotland, UK.