Lake Pavin History, geology, biogeochemistry, and sedimentology of a deep meromictic maar lake

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• 60 m

-30 m -30 m

-20 m

-40 m

littoral facies

Pavin crater

formation

multiple

WE

a b

c d

W E

multiple

Pavin crater

formation

-10 m

slump deposit(ca. AD 600) in situ diatomite

littoral facies

-26 m

-50 m

• 40 m

-30 m

-50 m

• 40 m

-30 m

Pavin crater

formation

Pavin crater

formation

in situ diatomite

W 50 m E W E

50 m

50 m 50 m

PAV09-B1

• 30 m


• 40 m

multiple

• 90 m

littoral facies

PAV10-E

in situ diatomite

slump deposit

(ca. AD 600)

slide scar

(ca. AD 1300)

Pavin crater

formation

gas rich sediments

Pavin crater formation

• 60 m
  
  
  • 30 m
  
  
  
  

100 m

SSW NNE

e

Fig. 22.5 Lake Pavin sub-bottom profi les illustrating the acoustic
facies developed in littoral environments or along the subaquatic pla-
teau ( a , b , c , d , e ) and down to the deep central basin ( e ). Note that all
these sedimentary environments develop contrasted acoustic facies
above the subaquatic plateau formed by the Pavin crater formation. The

location of short gravity cores PAV09B1 and PAV10E is also indicated.

As detailed in this chapter and in Chap. 23 , in situ deposits ( diatomites )

on the plateau are clearly distinguished from reworked sediments

(ca. AD 600 slump deposit and ca. AD1300 slide scar ). The location of

each seismic section is given in Fig. 22.2

22 Pavin Sedimentary Environments