| 鲍学昭,陆松年,李惠民.锆石平均阳离子半径的变化趋势及其在判别形成环境中的意义[J].地质找矿论丛,1997,(1):36-43 |
| 锆石平均阳离子半径的变化趋势及其在判别形成环境中的意义 |
| AVERAGE CATION RADIUS R VALUE OF ZIRCONS AND ITS SIGNIFICANCE IN EXPLAINING THE VARIATION OF FORMATION TEMPERATURE AND PRESSURE OF ZIRCONS |
| 投稿时间：1996-12-13 修订日期：1997-01-21 |
| DOI：10.6053/j.issn.1001-1412.1997.1. 005 |
| 中文关键词: 锆石 平均阳离子半径 PT变化趋势 岩浆作用 变质作用 |
| 英文关键词:Zircons average canon radius variation of P and T magmatism metamorphism |
| 基金项目:国家自然科学基金49202021 |
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| 中文摘要: |
| 计算了变质成因和岩浆成因锆石从晶体核部至边缘的平均离子半径,发现它们的变化存在规律性,作者认为这种规律性同锆石结晶时岩浆或母岩的温压条件变化密切相关,论述了用锆石平均阳离子半径变化趋势来判别其结晶PT条件变化趋势的方法及可能性。 |
| 英文摘要: |
The structure zoning trends are discovered in magmatogenic and metamorphogenic zircons.The structure parameter is obtained by calculating the average canon radius R value of zircons,which can be expressed in the formula:  (canon number×catinn radius)  cationnumber. It has been proved that the R value is directly proportional to the unit cell volume in an individual crystal. The fact discovered in this paper suggests that: 1. in magmatogenic zircons, the decreasing of R from inner to outer portion of each growth zoning or from core to rim of a crystal indicates the gradual lowering of magma temperature during crystallization; the increasing in Rvalue indicates the gradual decreasing in magma pressure during crystallization. 2. in metamorphiczircons, the higher the metamorphic grade of protolith, the larger the average R value of the metamorphogenic zircons isn in individual crystals, from core to rim the R value has a rising trend, which indicates that the temperature of protolith mainly rises during the growth of metamorphogenic zircons. |
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