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Abstract

After the end of Hercynian orogeny, most of the territory of continental France had been consolidated into a rigid platform ("môle des Gaules"). The base of the trasgressive secondary layers, deposited during Triassic or Jurassic eras on this platform, consists of neritic or lagunal deposits.

All around the exposures of ancient massifs (Massif Armoricain, Massif Central), very near from the old shore lines, are located different deposits of the strata-bound Pb. Zn, Ba, F type, as shown in Figure 1.

The concept of regional metallotect (cf. reference) gives a way of understanding the geological regularities and the geographical location of these deposits which seems a much better one than a controversy on genetic theories. This is, in fact, connected with the author's conception as follows: this type of deposit results from the action of different genetic processes which took place simultaneously or successively (Fig. 2).

The regional metallotect which is connected with the deposits shown on Figure 1 (neritic layers of shallow water sediments transgressive after orogeny near the shore lines), gives a good guide to ore exploration from a strategic point of view.

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