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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Sphalerite Ar-40/Ar-39 progressive crushing and stepwise heating techniques
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Sphalerite Ar-40/Ar-39 progressive crushing and stepwise heating techniques

机译：闪锌矿Ar-40 / Ar-39逐步破碎和逐步加热技术

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It is difficult to determine the mineralization ages of sulfide deposits because no suitable minerals can be selected for the traditional isotopic dating methods. The Ar-40/Ar-3 9 method rarely applies well to sulfide minerals because of their trace potassium content and strong radioactivity after irradiation. This preliminary study investigates the possibility of dating the hydrothermal sphalerites by Ar-40/Ar-39 using crushing and heating techniques. The Ar-40/Ar-39 crushing experiments of two sphalerite samples from the Fankou Lead-Zinc Deposit yield well-defined and concordant isochron ages of 265.8 +/- 1.0 (1 sigma) Ma and 269.7 +/- 6.2 Ma corresponding to initial Ar-40/(36) Ar ratios of 290.7 +/- 2.4 and 294.6 +/- 8.1 respectively. The crushed powders of the later sphalefite yields, with stepwise heating, a flat age spectrum with Ar-40/Ar-39 plateau age of 267.2 +/- 2.5 Ma, which define a good isochron with an age of 271.3 +/- 5.4 Ma and initial Ar-40/(36) Ar ratio of 294.0 +/- 1.7. This is the first report to distinguish secondary and primary fluid inclusions within sphalerite, to obtain their ages using the crushing technique, and to obtain good concordant ages both of fluid inclusions by crushing and heating of K-containing minerals. We expect progressive crushing and stepwise heating techniques will become an effective approach to Ar-40/Ar-39 dating of the mineralization ages of hydrothermal sulfide deposits. (c) 2007 Elsevier B.V. All rights reserved.
机译：由于无法为传统的同位素定年方法选择合适的矿物，因此难以确定硫化物矿床的矿化年龄。 Ar-40 / Ar-3 9方法很少适用于硫化物矿物，因为它们的痕量钾含量和辐照后的强放射性。这项初步研究调查了使用压碎和加热技术使Ar-40 / Ar-39与水热闪锌矿约会的可能性。樊口铅锌矿床中的两个闪锌矿样品的Ar-40 / Ar-39破碎实验产生了清晰的，一致的等时线年龄265.8 +/- 1.0（1 sigma）Ma和269.7 +/- 6.2 Ma Ar-40 /（36）Ar比分别为290.7 +/- 2.4和294.6 +/- 8.1。后来的闪锌矿压碎粉末通过逐步加热可产生平坦的年龄谱，其中Ar-40 / Ar-39平台年龄为267.2 +/- 2.5 Ma，这定义了良好的等时线，年龄为271.3 +/- 5.4 Ma初始Ar-40 /（36）Ar比为294.0 +/- 1.7。这是第一份区分闪锌矿中次生和初生流体包裹体，使用破碎技术获得其年龄并通过破碎和加热含K矿物获得流体包裹体的良好一致年龄的报告。我们预计逐步压碎和逐步加热技术将成为解决热液硫化物矿化年龄Ar-40 / Ar-39年代的有效方法。 （c）2007 Elsevier B.V.保留所有权利。

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