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１前言铀系不平衡是自然界普遍存在的现象，无论是地表低温环境还是岩浆高温系统，都存在着铀、钍衰变系列中子、母体之间的不平衡现象。这是由于各种地质过程（包括高温岩浆过程、高温高压变质过程、地表低温风化侵蚀及化学过程）对原来业已处于铀钍放射性平衡状态之体系...
1 Preface uranium imbalance is a common phenomenon in nature, both surface low temperature environment and magma high temperature system, there are uranium, thorium decay series of neutrons, the imbalance between the mother. This is due to a variety of geological processes (including high-temperature magmatic processes, high temperature and high pressure metamorphic processes, low temperature weathering erosion and chemical processes) on the original has been in the uranium-thorium radioactive equilibrium system ...