Abstract
The article presents original data of the radioisotope age and composition of rare elements in basalts of dredging stations 2776 and 2764 located in the southern part of the Central Fault in the Philippine Sea. Researchs have shown that basalts of st. 2776 demonstrate the chemical features of tholeiites of middle-oceanic ridges and oceanic island arcs (N-MORB+OIAB). And basalts of st. 2764 combine the features of E-MORB+OIAB. A comparative analysis of the chemical composition of the volcanics of both stations and of the Kyushu-Palau Ridge shows that all rocks are united by the enrichment of melts with a «subductional» and withinplate (WPB) components. But WPB features in the rocks are mostly manifested at the level of the Primitive Mantle (PM), and these features have not reached to the level of alkaline basaltoids of the ocean islands (OIB).
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