ALBERT

Description: Many occurrences of mineral resources in ocean water, on the ocean floor and in its deeper parts have long been well-known. This is readily understandable, because numerous ancient mineral products which are exploited on land were originally formed in marine milieus as far back as the Precambrian , e.g., marine sedimentary iron ores, rock salt, potassium, phosphate and manganese , as well as petroleum and natural gas. This book deals with ores in sediments, and in sedimentary and volcanic rocks. According to the Concise Oxford Dictionary (Fowler and Fowler , 1964), ore is defined as "solid native mineral aggregate from which valuable constituents not necessarily metal may be usefully extracted". Therefore , in tllis chapter only mineral resources of inorganic origin in ocean water and on the ocean floor are discussed and not those of organic derivation, although the existence of petroleum, natural gas and, to some extent, of coal in the subsurface of the ocean shelves is of greater economic importance. The amount of oil and gas produced in 1969 represented more than 90% by value of all mineral resources obtained from the oceans and ocean floors. Ore deposits in bed-rock formations of the shelf region, such as those which are exploited near Cornwall (England) and Newfoundland for example, are also irrelevant, as these are merely extensions of discoveries on the nearby mainland. The purpose of this chapter is to give a general review of the (inorganic) mineral resources of the oceans and the ocean floors . In this respect, not only are the economically important products which are already in use discussed, but also those materials which, in their oceanic environment, can become of economic value in the near or more remote future. For a better understanding of the existence of such materials, some deposits have also had to be reviewed which will not become of economic value . Since some contributions in this book are specifically dedicated to Recent marine ferromanganese deposits and Recent phosphorite deposits, these mineral resources are only briefly discussed in tllis chapter. (For details on Recent marine and lacustrine manganese deposits see Chapters 7 and 8 by Glasby/Read and by Callender/Bowser, respectively, in Volume 7.) The litarature on the mineral (inorganic) resources of the oceans and ocean floors is extremely extensive, so that a choice had to be made and, therefore, the bibliography added to this chapter consists mainly of recent publications.

Description: A complete set of linearly independent relationships among the different cross spectral components obtained from pairs of moored instruments is derived which can be utilized to test whether or not the observed fluctuations within the internal wave frequency band represent a field of propagating internal waves. A further complete set of relationships is derived which enables to test whether or not the internal wave field is horizontally isotropic and (or) vertically symmetric. These relations are compared with corresponding relations for alternative models (standing internal wave modes, three-dimensional isotropic turbulence) and their capability to discriminate between the various models is investigated. The tests are applied to a set of data for which it is found that the observed fluctuations are consistent with both propagating and standing internal waves whereas isotropic turbulence must be rejected for the most part of the internal wave frequency band.