(Table 1) Concentrations and isotopic ratios of sulfur and carbon in acid conglomerates from DSDP Hole 57-439@en

The sulfur content of one rhyolite and four dacite conglomerates was found to be low - from 9 to 97 ppm - similar to that of Quaternary andesites and basalts of the Japanese Islands. However, the d34S values of these samples are unexpectedly high - +23 to +35 per mill - relative to troilite from the Canon Diablo meteorite. The sulfide/sulfate ratios vary among the five samples from 0 to 13. No significant isotope fractionation seems to exist between sulfate and sulfide sulfurs. Carbon in these samples is predominantly in the form of carbonate (and probably CO2). It ranges in concentration from 128 to 721 ppm and in d13C from -2.5 to -20.7 per mill relative to PDB.本次检测发现，1件流纹岩（rhyolite）及4件英安岩砾岩（dacite conglomerates）的硫含量偏低，介于9至97 ppm之间，与日本群岛第四纪（Quaternary）安山岩（andesites）及玄武岩（basalts）的硫含量特征相近。然而，相较于卡农迪阿布洛陨石（Canon Diablo meteorite）中的陨硫铁（troilite），本次样品的δ34S值异常偏高，处于+23‰至+35‰区间。5件样品的硫化物/硫酸盐比值（sulfide/sulfate ratios）介于0至13，存在一定差异。硫酸盐硫与硫化物硫之间未显现显著的同位素分馏（isotope fractionation）现象。本次样品中的碳主要以碳酸盐（carbonate）形式赋存，大概率还包含二氧化碳（CO₂）；其碳浓度范围为128至721 ppm，相对于佩尔迪贝尔箭石标准（PDB）的δ13C值介于-2.5‰至-20.7‰之间。