Notes
et mémoires (1967) - Travaux
de DAVOINE, DAVID, MARTIN.
100 p., 23 texte-fig., 7 tabl.
Sommaire
P.
DAVOINE - L'analyse chimique des roches silicatées.
abstract
L.
DAVID - Baudran, nouveau gisement de Vertébrés
quaternaires sur le Causse de Martel. abstract
R.
MARTIN - Le Glouton de Villereversure. abstract
Abstracts
P.
DAVOINE - L'analyse chimique des roches silicatées
This
text is applied to students of geology bringed to
take interest in the chemical analysis of silicate
rocks. The determination of the 11 main elements are
based upon the decomposition of 3 separate samples
which will be designated I, II, III.
Sample
I is decomposed by cold mixture (15° C) of hydrofluoric
and sulfuric acids. In the resulting solution, iron
ferrous is determined potentiometricolly.
Sample
II is attacked by fusing with Na2CO3 and K2CO3 (1000°
C) and dissolved in dilute HCl. The silica titration
is determined gravimetrically. Five aliquot portions
are taken for iron ferric, aluminium, calcium and
magnesium complexometric titrations (EDTA) and the
phosphorus absorption spectrophotometric titration.
Sample
III is decomposed by hot mixture (90° C) of hydrofluoric
and sulfuric acids and dissolved in dilute H2SO4.
In the resulting solution, sodium and potassium emission
spectrophotometric titrations (flame) and manganese
and titanium absorption spectrophotometric titrations,
are established.
This
analytical method is used in a routine manner by some
rocks analysis laboratory. It is used also in earth
sciences department in Lyon.
L.
DAVID - Baudran, nouveau gisement de Vertébrés
quaternaires sur le Causse de Martel
A
new fossiliferous area in SW-France. Only remains
of three species of mammals were discovered in the
upper part of alluvions in a chasm. The present study
however gives a relative description of deposits in
this pleistocene cave.
R.
MARTIN - Le Glouton de Villereversure
At
Villereversure near Bourg-en-Bresse (Ain) a deposit
of fossils mammals has been searched by J.M, BEROUD
(1883) and a first study has been published by E.
CHANTRE (1901) ; the Author who has assumed the revision
ot the fauna sets forth in this paper the remains
of eight Gulo gulo : he gives a detailed description
of the teeth and the long bones. He concludes by a
few hypothesis concerning the date of the deposit
: the lower layers, containing Reindeer, may be regarded
as Riss in date, whereas the upper osseous deposit
which is in four different and successive layers is
to have been setting up during the most important
part of Würm.