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This paper considers the petrochemistry of basalts and distribution of organic gases in basalts recovered from Holes 407, 408, 409, 410, 410A, 411, 412A, and 413. For this purpose, we compiled variation diagrams for the major rock-forming elements and some petrochemical coefficients, then grouped the plotted values in all diagrams into three mutually overlapping fields corresponding to the three regions of the Mid-Atlantic Ridge in which the DSDP drilling was conducted. Petrochemical differences of basalts developed in various regions of the Mid-Atlantic Ridge can be explained either by lateral heterogeneity of the composition of the mantle substratum, or by the various depths of magma generation. The absence of a discrete distribution of the major rock-forming elements (especially aluminum, magnesium, and titanium) in the basalts of each of the three identified groups testifies to a negligible role of crystallization differentiation. This does not contradict the petrographic characteristics of the basalts. The distribution of organic gases in basalts is extremely diverse. We did not establish a distinct correlative dependence between the various gases and the chemistry of basalts in this study.

Petrochemistry of Basalts and Distribution of Organic Gases: Holes 407. 408, 409. 410, 410A, 411, 412, and 413, DSDP Leg 49