ON THE SEDIMENTARY AND CONSERVATIVE ENVIRON

MENT RELATED TO TECTONIC MOVEMENT OF KABASAWA FOSSIL PLACER DEPOSIT

Abstract

The factors which influence the depositional environment of fossil iron-sand placer deposits are the climate, tectonic regime, general palaeogeographic environments, peculiarities of the source area, and the hydro-dynamic conditions in the front basin. It is obvious that the deposition of fossil iron-sand placer deposit is controlled more or less by these factors.
The author (Saitoh, 1972) has reported on the general geology and tectonic movement near Kabasawa Mine area. The warping movement of Okubushi-Line which is the main tectonic line in this area controlled the differentiation and development of the Pliocene sedimentary basin and the deposition of Pliocene Sendai Group, especially Kabasawa sandstone and conglomerate member intercalated ilmenite placer deposit.
It is the purpose of this paper to point out the fact that Kabasawa ilmenite placer deposit has been built up and kept in a very good condition being controlled by the warping movement of Okubushi-Line.