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35514 documents, page 1 of 3552

青森県西津軽郡鰺ケ沢地域の第三系と鰺ケ沢地域第三系の化石珪藻群

The geology and paleontology of the Ajigasawa District in Nishi-Tsugaru-gun Aomori Prefecture, long known as the "Ajigasawa oil-field", has been studied by many authors. The purpose of the present paper is (1) to review the stratigraphy of the Ajigasawa District based upon the author's field worksand (2) of report on the Tertiary marine diatoms collected from the stratigraphically controlled sections in the district. The stratigraphical classification of the Tertiary rocks in the Ajigasawa Di...

<報文>高クロムラテライト鉱の乾式処理後のクロマイトの形態について

Present investigation was conducted to identify the chromite recovered by various pyrometallurgical treatments reported in the previous work by microscopic examination, electron probe microanalysis and X-ray diffraction. The results obtained are summarised as follows : 1) The form and composition of chromite recovered by various preliminary reduction processes are the same as that of gravity concentrates except that of flow sheet A-25p which was recognised to possess higher Cr/Fe ratio with t...