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前言 开展石笋、钟乳石、石灰华等的地质年龄及其形成速度的研究,对于研究岩溶洞穴的发育史具有重要意义,由于其年龄范围常在几万年至几十万年之间,所以应用铀系测年方法较为合适。在国外,从六十年代末至七十年代初就开展了这方面的研究工作,如Fcrnanca等(1968)论证了~(230)Th/~(234)U比值在洞穴年龄测定方面的潜力;Ngvyen等(1969)研究了以铀系测定石笋年龄的方法;格林·M(1974)等对英国Blanchard Springs洞穴石笋的年龄进行了研究,认为应用~(234)U/~(238)U法最为合适。
Preface The research on the geologic age and its formation rate of stalagmites, stalactites and travertines is of great significance for the study of the developmental history of karst caves. Due to its age range of tens of thousands to hundreds of thousands of years, uranium Department dating method is more appropriate. In foreign countries, researches in this field have been carried out from the late 1960s to the early 1970s. For example, Fcrnanca et al. (1968) demonstrated the potential of the ~ (230) Th / ~ (234) U ratio in the age determination of caves; Ngvyen et al. (1969) studied the method of determining the age of stalagmites using uranium; Green et al. (1974) studied the age of stalagmites in the Blanchard Springs Cave in the United Kingdom and concluded that the ~ (234) U / ~ (238) U method was the most Suitable.