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近十年来,前寒武地质年代学取得了一些显著进展,如格陵兰最古老年龄的发现等,促进了对地壳演化研究的兴趣。我们曾经在研究燕山地区震旦地层的基础上,建立了中国震旦地层同位素地质年表和测定了某些地层的Rb-Sr年龄;迁西36亿年年龄并未得到证实;寻找中国最古老地壳仍是需要解决的重大课题之一。 本文就我们测定的鞍山及其他地区一些前寒武岩石铅同位素数据,结合其他资料初步讨论中国前寒武地层同位素地质年表以及探索我国可能的最古老地壳年龄(图1)。
In the past ten years, some remarkable advances have been made in the Precambrian geochronology, such as the discovery of the oldest age in Greenland, which has promoted the interest in the study of crustal evolution. On the basis of studying the Sinian strata in Yanshan area, we established the isotopic geochronology of the Sinian strata in China and determined the Rb-Sr age of some strata; the age of 3.6 billion years of relocating to the west has not been confirmed. Looking for the oldest The crust is still one of the major topics to be solved. In this paper, some pre-Cambrian lead isotope data of Anshan and other areas in our country are determined, and other data are used to preliminary discuss the isotopic geochronology of the Precambrian stratigraphy in China and explore the probable oldest crustal age in China (Figure 1).