【摘要】 <正> 云南大红山矿区为我国著名的同海底火山喷发有关的铁铜矿床。矿区地质、岩石学研究工作已相当详尽。据云南省地质九队等单位研究,从喷发物的产状分布特点推断为中心式喷发。由于火山喷发这种巨大热源将引起围岩的同位素交换反应而导致同位素分更多还原

【Abstract】 The authors have studied the oxygen and carbon isotopic compositions of the carbonate wall rocks from the Dahongshan mining area, Yunnan Province and, combining with geological features, laid emphasis on the study of the underlying marble which is most greatly affected by the ancient volcanic eruption. The analyses of 31 samples indicate that there is a distinct pattern for the variation of oxygen and carbon isotopic compositions, which is in coincidence with the pattern of the central-volcanic eruption and volcanic neck emplacement inferred from geological and petrological studies. The oxygen and carbon isotopic data also show that the carbonatite rocks in the Dahongshan area were most likely formed by melting of the marble. As a supplement to the data appeared in the paper[1], the oxygen and carbon isotopic data of 13 siderite samples are presented here. They may be characteristic of the moderately metamorphosed volcanic-sedimentary siderites.更多还原