Archive image from page 197 of The depths of the ocean;. The depths of the ocean; a general account of the modern science of oceanography based largely on the scientific researches of the Norwegian steamer Michael Sars in the North Atlantic depthsofoceange00murr Year: 1912 160 DEPTHS OF THE OCEAN silicate phillipsite occurs in the pelagic deposits, and is supposed to be a secondary product derived from the decomposition of volcanic rock fragments. Phillipsite is found in the various kinds of deposits in the deep water of the Central Pacific and Central Indian Ocean far from land, and is most
Archive image from page 197 of The depths of the ocean;. The depths of the ocean; a general account of the modern science of oceanography based largely on the scientific researches of the Norwegian steamer Michael Sars in the North Atlantic depthsofoceange00murr Year: 1912 160 DEPTHS OF THE OCEAN silicate phillipsite occurs in the pelagic deposits, and is supposed to be a secondary product derived from the decomposition of volcanic rock fragments. Phillipsite is found in the various kinds of deposits in the deep water of the Central Pacific and Central Indian Ocean far from land, and is most abundant in some Red clay areas. It occurs in crystalline form, either as simple isolated microliths, crossed twins, irregular groups, or aggregated into spherolithic groups in which these zeolitic crystals are entangled together so as to form crystalline globules of sufficient size to be distinguished by the naked eye. The distribution of these crystals of phillipsite coincides with that of basic volcanic glasses and basaltic lapilli over the ocean-floor, the decomposition of which, under the action of sea-water, would give rise to the materials afterwards deposited in a free state as zeolitic crystals and aggregates. Radio-active Professor Joly has examined substances. for their radium contents a number of deposit-samples supplied by Sir John Murray. He finds that the deep-sea deposits are much richer in radium than the average terres- trial rorks The Red clavs and FlG' I35--Manganese Nodule with trial rocKS. i ne rvea ciays anu TWO TuNICATES AND A brachiopod the Radiolarian oozes, which are attached. laid down in deep Water far from 'Challenger' Station 160, Southern Ocean, 2600 fathoms. land, contain much more radium than the calcareous deposits like the Pteropod and Globigerina oozes. The radio-activity and percentage of calcium carbonate in the deposits stand in an inverse ratio to each other, and the Blue muds contain less than the calcareous oozes, though more than
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