Volcanic ash layers absolute dating


Aerial image of Kameni islands in 2003. Taken from west with Palea Kameni Island in front of Nea Kameni. Thira town on caldera rim in background.

Rocks which contain above average amounts of sodium and/or potassium for the group of rocks for which it belongs. For example, the basalts of the capping stage of Hawaiian volcanoes are alkalic . They contain more sodium and/or potassium than the shield-building basalts that make the bulk of the volcano.

The answer came at a chance meeting. Sigl encountered Kees Nooren, a PhD student from Utrecht University in the Netherlands, when the two were presenting side-by-side research posters at a conference. Nooren had been studying lake sediments in a delta just west of the Términos Lagoon along the Gulf of Mexico near the Yucatan Peninsula, when he unearthed a few shiny layers of volcanic ash. He analyzed individual shards of volcanic glass in the sediment and traced them back to El Chichón, then used carbon dating to pin the layers to . 540, give or take 16 years. So when Nooren saw the sulfur spike at 540 on Sigl’s poster, he turned to him and said: “Hey, I might have a candidate for that.”


Volcanic ash layers absolute dating

Volcanic ash layers absolute dating



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