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锆石的特点是含铀量高,并作为耐风化的稳定副矿物广泛地产出于火成岩、变质岩和沉积岩中,是裂变径迹定年技术中应用最广的矿物之一。锆石径迹定年技术中,关键是选择适宜的制片方法和最佳蚀刻条件对此许多研究者已做过大量探讨,目前采用的蚀刻方法有:375—500℃高温下磷酸蚀刻法,220℃下NaOH或200℃下NaOH+KOH蚀刻法和150—180℃温度下的HF+H_SO_4蚀刻法。因锆石颗粒一般都比较小,为了准确地统计每个锆石颗粒同一内表面上的自发和诱发裂变径迹密度,一般采用的步骤是:先将锆石晶粒固
Zircon is characterized by its high uranium content and its widespread occurrence as a weathered and stable secondary mineral in igneous rocks, metamorphic rocks and sedimentary rocks, and is one of the most widely used minerals in fission track dating techniques. The key to zircon dating technology is to select the appropriate method of preparation and the best etching conditions. Many researchers have done a lot of research. The current etching methods include: phosphoric acid etching at 375-500 ℃, 220 ° C NaOH or NaOH + KOH etching at 200 ° C and HF + H_SO_4 etching at 150-180 ° C. Because the zircon particles are usually small, in order to accurately calculate the spontaneous and induced fission track density on the same inner surface of each zircon particle, the commonly used steps are as follows: