从同位素年代学到构造年代学

From isotopic chronology to tectonic chronology

从同位素年代学发展到构造年代学,中间必须经历热年代学、构造-热年代学、变形年代学等阶段。同位素年代学只是提供简单的地质事件年龄,热年代学同时赋予了地质事件温度和年龄信息,而构造年代学则强调地质或构造过程中时间-空间的四维演化过程。构造年代学使年龄数据的科学意义除了时间外,还有温度、地壳深度变化、是否有流体参与等多重意义,它涉及到多维空间的变化:时间、温度、水平方向的二维变形、垂直方向的变形等。在现有技术和认知水平的条件下,强调指出了从变形年代学到构造年代学的发展中要注意的一些关键问题,而回归传统地质、以野外变形为基础的变形年代学研究是构造年代学发展的前提。

Development of geochronology from isotopic chronology to tectonic chronology must evolve several stages including thermal chronology, tectono-thermochronology and deformation chronology. The isotopic chronology merely and simply refers ages to geologic episodes, however, the thermal chronology can provide both ages and temperature information, and the tectonic chronology emphasizes four-dimensional temporal and spatial evolution in a geological or tectonic processes. The tectonic chronology has multiple significances such as temperature, crustal depth and geological fluids, besides a time factor. It implies a great deal of information including time, temperature, horizontal and vertical deformation and development. In view of present technology and understanding level, we should pay special attentions to some important problems. Among these problems, emphasizing field geology or structural geology is the essential prerequisite to develop the tectonic chronology.