| | |
Summary: PII S0016-7037(99)00257-4
Accumulation of mantle gases in a permanently stratified volcanic lake
(Lac Pavin, France)
W. AESCHBACH-HERTIG,1,
* M. HOFER,1
R. KIPFER,1
D. M. IMBODEN,1
and R. WIELER
2
1
Environmental Physics, Swiss Federal Institute of Technology (ETH), Swiss Federal Institute for Environmental Science and Technology
(EAWAG), CH-8600 Du¨bendorf, Switzerland
2
Isotope Geology, Swiss Federal Institute of Technology (ETH), NO C61, CH-8902 Zurich, Switzerland
(Received October 15, 1998; accepted in revised form April 29, 1999)
Abstract--Lac Pavin is a volcanic crater lake in the Massif Central (France), characterized by a permanent
vertical density stratification resulting from a strong and persistent chemocline between about 60 and 70 m
depth. The deep water below the chemocline forms the monimolimnion, in which most dissolved ions as well
as helium, carbon dioxide, and methane are strongly enriched. The 3
He/4
|
