| 超高压变质作用中水的相变增压 |
| |
| 引用本文： | 胡宝群,王方正.超高压变质作用中水的相变增压[J].地球科学,2001,26(1):13-17. |
| |
| 作者姓名： | 胡宝群 王方正 |
| |
| 作者单位： | 中国地质大学地球科学学院，武汉430074 |
| |
| 基金项目： | 教育部博士点基金项目! (No .980 14 0 0 3)，国家自然科学基金项目! (No .498730 0 9) |
| |
| 摘 要： | 据静水压力梯度计算，榴辉岩形成深度至少要70km，含柯石英榴辉岩的形成深度至少要120km，而同时含有柯石英和金刚石的榴辉岩形成工至少要145km，超高压变质岩要从如此深的部位折返到地表是不可想象的。大量资料表明水参与了超高压变质作用过程。通过矿物的脱水行为、水的相变和地温曲线等研究，指出由于存在水的相变增压等多种增压因素，大大提高了超高压变质作用过程中的地压梯度，据静水压力计算出的超高压变质岩形成深度只是最大深度，其形成时的实际深度要比该最大深度小得多。
|
| 关 键 词： | 超高压变质作用 水 相变 压力 静水压力梯度 榴辉岩 岩石圈 |
| 文章编号： | 1000-2383(2001)01-0013-05 |
PHASE TRANSFORMATION BOOSTER IN WATER DURING ULTRAHIGH-PRESSURE METAMORPHISM |
| |
| Hu Baoqun,Wang Fangzheng.PHASE TRANSFORMATION BOOSTER IN WATER DURING ULTRAHIGH-PRESSURE METAMORPHISM[J].Earth Science-Journal of China University of Geosciences,2001,26(1):13-17. |
| |
| Authors: | Hu Baoqun Wang Fangzheng |
| |
| Abstract: | The calculation in the hydrostatic pressure gradient shows that the eclogites were formed in the depth of at least 70 km, and the coesite-bearing eclogites in the depth of at least 120 km. In addition, the eclogites containing both the diamond and coesite in the depth of at least 145 km. It is unimaginable that the ultrahigh-pressure metamorphic rocks are uplifted to the earth surface from such depths. Many references show that the water is indispensable to the ultrahigh-pressure metamorphism. Based on the studies of the mineral dehydration, the geothermal curves and the phase change diagram of water, this paper indicates that such supercharges as the phase transformation booster in water greatly increase the lithostatic gradient in the process of the ultrahigh-pressure metamorphism. The depth for the formation of the ultrahigh-pressure metamorphic rocks calculated with hydrostatic pressure is only the greatest depth. However, the actual depth for the formation of the ultrahigh-pressure metamorphic rocks was much smaller than the theoretical depth as calculated with hydrostatic pressure. |
| |
| Keywords: | ultrahigh-pressure metamorphism water phase change pressure |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
