(Table 1) Downhole variation of potassium, apparent K-Ar age, and inert gas abundances at DSDP Holes 69-504B, 70-504B and 83-504B

Ne, Ar, Kr, Xe, and K2O were measured in representative samples of holocrystalline basalt from DSDP Hole 504B. No hiatus in inert gas abundance is recognized at the base of the \"oxic\" alteration zone and the extent rather than the nature of alteration appears to determine these abundances. When the inert gas abundances are separately plotted against K2O, two distinct trends of loss emerge, one for alteration involving K-gain, the other for K-loss. […]

对取自深海钻探计划（Deep Sea Drilling Project, DSDP）504B孔的代表性全晶质玄武岩（holocrystalline basalt）样品，测定了其内部氖（Ne）、氩（Ar）、氪（Kr）、氙（Xe）与氧化钾（K₂O）的含量。在"氧化蚀变带（oxic alteration zone）"的底部未发现惰性气体（inert gas）丰度存在间断现象，且蚀变作用的强度而非其类型似乎决定了上述组分的丰度。当将惰性气体丰度分别与氧化钾（K₂O）进行绘图关联时，可观察到两种截然不同的亏损趋势：一种对应伴随钾富集（K-gain）的蚀变作用，另一种对应伴随钾亏损（K-loss）的蚀变作用。[…]