SUMMARY In order to obtain data comparable to those of Biscaye (1965) on the Atlantic Ocean, the authors carried out quantitative X‐ray determinations of clay minerals in the sediments of the Indian and Pacific oceans using the Biscayemethod.

No abstract

No abstract

No abstract

Thorough study of the mineralogy of clay matter retrieved from DSDP drill sites is important in understanding the geological development of the sea floor. This report deals with: (1) the stratigraphic age distribution of clay minerals in sections of the Leg 48 holes; (2) bonds of clay mineral associations with lithological types of rocks and volcanism; and (3) features of formation of clay mineral associations.The mineralogical composition of the clay fraction of sediments and rocks of Leg 48 was studied on Sites 403,404, 405, and 406 in the vicinity of Rockall Plateau, and on Sites 401 and 402 of the Bay of Biscay. The 18Å (Reynolds, 1968).The identification of mixed-layer minerals was carried out on the basis of works by Brindley