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THESE NETO Jérémy Genèse des minéralisations uranifères ...

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Roches/Chondrites<br />

144<br />

1000<br />

100<br />

10<br />

1<br />

0,1<br />

CA-07-30B<br />

CA-08-7A<br />

CA-07-34A<br />

CA-08-7B<br />

CA-07-34A<br />

CA-07-30B<br />

CA-08-7A<br />

Granite A'<br />

Pegmatite A' à poches quartzeuses<br />

Pegmatite A' à schlierens<br />

Leucosome<br />

CA-08-7B<br />

La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu<br />

Figure I-55 : Spectres ETR normalisés aux chondrites C1 (Sun & Mac Danough, 1989) du granite A’ et <strong>des</strong><br />

pegmatites A’.<br />

206 Pb /238 U<br />

0,40<br />

0,38<br />

0,36<br />

0,34<br />

0,32<br />

1740<br />

1700<br />

0,30<br />

1660<br />

0,28<br />

0,26<br />

CA-07-7A<br />

1780<br />

1820<br />

1860<br />

1900<br />

1940<br />

1980<br />

-38±62 & 1816.6±2.7 Ma<br />

MSWD = 1.7<br />

4,0 4,4 4,8 5,2 5,6 6,0<br />

Figure I-56 : Datation U/Pb sur zircons <strong>des</strong> pegmatites A’.<br />

data-point error ellipses are 2σ<br />

207 Pb /235 U

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