| 实验研究岩石圈深部流体及相关科学问题 |
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| 引用本文：张荣华,胡书敏,王军,张雪彤.2004.实验研究岩石圈深部流体及相关科学问题[J].地球学报,25(1):17-24. |
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| 基金项目:国家科技部基础研究项目“大规模成矿作用”(G1999043212)”，“全国理化数据库”项目(2001DEA30041)，“极端条件下物质标准”项目(2001DEA20023)，国土资源部重点基础项目“重要金属矿来源迁移堆积过程和化学动力学”(9501115)，“地球化学动力学和成矿系统复杂性”（20010302和DK2001022）及自然科学基金项目（40043011） |
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| 中文摘要:实验研究地球岩石圈深部流体和对地球深部流体的观测发现，水溶液在跨越临界态时有许多特殊性质。使用水热金刚石压钻在200～800MPa，300～700℃条件下，可观测到：NaCl-H2O溶液两相不混溶相区的结构和近临界态现象。测量高温高压下NaCl溶液的电导率，在近临界和跨越临界态时发现最大电导率值。在对大洋中脊热水观测中可发现大多数喷口是在2200m深。喷口正在近临界态条件下喷出含矿流体。这些临界态研究对于重新分析岩石圈的地球物理测量结果和对认识大陆岩石圈内流体性质有很大意义。 |
| 中文关键词:NaCl-H2O溶液 岩石圈深部流体 临界态 电导率 高导层 |
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| Experimental Investigations and Observations on Deep Earth Fluids and Related Scientific Problems |
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| Abstract:Experimental investigations and observations on deep earth fluids have found that fluids show lots of specific properties when they cross the critical state. The liquid vapor phase irrevisblility fields and near critical phenomena of NaCl solutions were detected by using HDAC (hydrothermal diamond anvil cell) connected to microscope over the temperature range from 300 to 700℃, and pressure from 2～8 kb. The measurement of electric conductance of NaCl solutions has also revealed that the electric conductances occur from near critical state to crossing the critical state. The observation of hydrothermal vents in the Middle Ocean ridge has found that gas vents are usually located at the depth of 2200 meter, and ore forming fluids erupted at the critical temperature from the vents. This research on the critical state of NaCl solution has an important significance in understanding the deep geophysical investigations and the fluids in the depth of the lithosphere. |
| keywords:NaCl-H2O solution deep earth fluids critical state electric conductance high conductivity layer |
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