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Book Chapter

Geochemistry of the Albano crater lake

By
M. L. Carapezza
M. L. Carapezza
1
Istituto Nazionale di Geofisica e Vulcanologia – Sezione Roma 1, Via Vigna Murata 605, 00143 Roma, Italy
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M. Lelli
M. Lelli
2
Istituto di Geoscienze e Georisorse – Consiglio Nazionale delle Ricerche, Via G. Moruzzi 1, 56124 Pisa, Italy
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L. Tarchini
L. Tarchini
3
Dipartimento di Scienze Geologiche – Università Roma Tre, L.go San L. Murialdo 1, 00146 Roma, Italy
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Published:
January 01, 2010

Abstract

Albano Lake is within the youngest polygenetic crater of Colli Albani, from which several lahar-generating water overflows occurred up to early Roman times. The area has anomalous gas emissions and is affected by seismicity and uplift. The geochemistry of the lake have been systematically investigated since 2003 by measuring physico-chemical parameters along vertical profiles with a multiparametric probe and by collecting water samples for chemical and isotopic analyses. The lake is thermally and chemically stratified, with an anoxic hypolimnion from −70 m to the bottom (−167 m). The isotopic composition of dissolved helium and total carbon is similar to that of the main gas emissions of Colli Albani and of the phenocryst inclusions of the Alban volcanics, suggesting that an endogenous gas of deep provenance is injected into the lake water. The dissolved CO2 content is, however, far from saturation, and no Nyos-type hazardous gas cloud emission may presently occur in the lake. Temperature and chemical time variations indicate that water rollover episodes occur in harsh rainy winters when the surface lake temperature cools below 8.5 °C. Such rollovers tend to homogenize the physico-chemistry of the lake water and reduce the dissolved CO2 content. They may cause an environmental hazard because of related toxic algal blooms.

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Contents

Special Publications of IAVCEI

The Colli Albani Volcano

Geological Society of London
Volume
3
ISBN electronic:
9781862396258
Publication date:
January 01, 2010

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