| 大气^40Ar／^36Ar端元值及其地质意义 |
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| 引用本文：王松山,桑海清,裘冀.1997.大气^40Ar／^36Ar端元值及其地质意义[J].地球学报,18(3):313-317. |
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| 基金项目:国家自然科学基金 |
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| 中文摘要:月岩和陨石形成时捕获了太阳风中的Ａｒ同位素。作者对恩施陨石采用４０Ａｒ／－３６Ａｒ技术，并对Ｃｌ的诱发产物进行了校正后，获得了４６００Ｍａ前太阳风中４０Ａｒ／３６Ａｒ比值是０．８９±０．４４。它表明地球大气圈中４０Ａｒ／３６Ａｒ比值经历了从０．８９到２９５．５的演化过程，影响这一过程的主要因素是地球的去气作用。 |
| 中文关键词:恩施陨石 太阳风 40Ar/36Ar比值 |
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| The Source Componet of 40 Ar/ 36 Ar of the Earth's Atmosphere and It's Geological Implication |
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| Abstract:The Enshi metorite fell on Dec. 26, 1974, in the Enshi County , Hubei Provence, China (109°51′20″E,30°34′40″N). The total mass recovered is about 9.57kg. The Enshi meteorite is an ordinary chondrite, classified as belonging to group H5. The K Ar and Ar Ar geochronology indicates that the K Ar gas-retention age is 4 503±91Ma, 40 Ar/ 39 Ar plateau age, total gases Ar Ar age and isochron age are 4 518±8Ma, 4 515±23Ma and 4505±16Ma, respectively. The result of ages shows that the parent body of Enshi meteorite has not suffered collisional event probably.A correlation diagram from gases release above 1000℃ gives a primordial trapped 40 Ar/ 36 Ar ratio, 0.89±0.44, using York formula. From the plot of derived K/Ca ratios, it is concluded that the high temperature release of trapped Ar is from Ca rich phases with low K/Ca ratios, almost cerntainly the bronzite.The ratio, 0.89±0.44, is possible that the source compnent of 40 Ar/ 36 Ar of the earth's atmosphere and the trapped Ar originated in the solar wind. |
| keywords:Enshi meteorite solar wind 40 Ar/ 36 Ar ratio |
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