Geochemical studies of the Cretaceous-Tertiary boundary in ODP Holes 113-689B...
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In a study of ODP Hole 689B no iridium (Ir) anomaly was found in Sections 1 through 6 of Core 25X or in Core 26X from the top down to section 2, 3-12 cm. The background Ir...
针对大洋钻探计划(Ocean Drilling Program, ODP)689B钻孔的研究显示,25X岩芯的第1至6段以及26X岩芯自顶部向下至第2段、3~12厘米范围内均未发现铱(Iridium, Ir)异常。背景铱(Ir)……



