Lake Pavin History, geology, biogeochemistry, and sedimentology of a deep meromictic maar lake
Table 7.1 Major and trace element composition of Pavin group magmas Sample Montcineyre Estivadoux Montchal Pavin P13-8 P7699 P13 ...
Reproducibility PAV1- 11 PAV1- 12 PAV- 1- 15 PAV1- 2 PAV- 1-25 PAV1- 3 PAV1- 4 PAV2- 1 PAV2- 3 PAV2- 5 PAV2- 6 PAV2- 7 PAV2- 8 P ...
13 4 10 12 14 16 18 20 35 45 55 65 75 Al2O3 SiO2 0 1 2 3 4 5 6 7 8 35 45 55 65 75 Na2O SiO2 0 1 2 3 4 5 6 7 35 45 55 65 75 K2O S ...
135 12 10 8 6 4 2 0 0 5 10 15 20 25 Ta Th 200180 160 140120 100 80 60 40 20 005 10 15 20 25 Nb Th 140 120 100 80 60 40 20 00 5 1 ...
136 inclusion compositions. Though some analytical limitations (see above) may slightly blur the geochemical signature of the pr ...
137 7.3.2 The Pavin Differentiation Series: A Crystal Fractionation Trend Dominated by Amphibole Fractionation The compositions ...
138 crystal fractionation process writes C i = C i ° f (Di-1) , where C i and C i ° represent the concentration of element i in ...
139 Fig. 7.4 Calculation of bulk D values in logarithmic diagrams. ( a ) Example of logarithmic dia- grams. Symbols as in Figs. ...
14 0 10.00 1.00 0.10 0.01 Zr Hf Nb Ta La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Solid/Melt D values Hawaïite Benmoreite Dg M B ...
141 Table 7.2 Bulk solid/melt partition coeffi cients of Pavin and Chaîne des Puys series Pavin group CP β–H M–B β–H M–B SiO 2 0 ...
142 7.4 Conclusions This preliminary study of the geochemistry of the eruptive products of Pavin group magmas shows that they de ...
© Springer International Publishing Switzerland 2016 143 T. Sime-Ngando et al. (eds.), Lake Pavin, DOI 10.1007/978-3-319-39961-4 ...
14 4 (Fig. 8.2 ). Altogether, 10 distinct tephras were found in stratigraphic positions distributed from the Late Glacial (Aller ...
145 sites. The tephra is distributed in vast lobes: (1) the southern lobe is oriented southwards and it was delimited at La Godi ...
14 6 Fig. 8.3 Localization of the MEMP volcanoes and the relevant tephra lobes. ( a ), after Bourdier ( 1980 ): #1, Pavin; #2, E ...
147 the thickness of the tephra bed that attains 10–30 cm at the easternmost sites, and 3 cm at the southernmost site (Planèze d ...
14 8 communication), or the mixing of two separate Plinian- derived eruptives within a short time range (days to weeks). 8.2.2 M ...
149 The ages of the four volcanoes, namely crater Pavin, Montchal, maar d’ Estivadoux , and Montcineyre , were esti- mated by me ...
150 peat embedding tephra attributed to this volcano; their mean age was considered as denoting the Pavin eruption. In the local ...
151 ment for this volcano (Table 8.3 ). The RenDateModel also enabled us to assess that the interval between the eruptions of Mo ...
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