深埋藏条件下鲕粒灰岩的热水交代实验研究
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The hydrothermal metasomatic experiment on oolitic limestone under the condition of deep burial
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    摘要:

    在相对静岩压力40 MPa、地温150℃(大体相当于4000 m深埋条件)、用时15 d的条件下,对灰色中厚层状鲕粒灰岩进行深埋藏热水交代白云化实验研究。结果表明:反应前后岩石的结构发生了轻微变化,尾液中的主要化学成分Ca2+浓度从0 mg/L增加到337 mg/L,Mg2+浓度从过饱和溶液降低到2830 mg/L。电子探针分析结果表明,固体样CaO含量由61.000%降为60.830%,而MgO则由0.296%升到0.350%。可见,参与实验的固、液样品反应前后主量元素Ca、Mg有一定的变化。但根据样品的宏观观察、镜下鉴定、扫描电镜及X衍射图谱的综合对比,认为在该实验条件下,尚未产生明显的白云化现象。

    Abstract:

    In order to probe into the dynamic mechanism of the oolitic limestone under the deep burial condition, the authors designed a high-pressure pump controlled device to simulate the process of dolomitization. The dolomitization experiment on oolitic limestone was conducted under the 40 MPa comparative lithostatic pressure and 150℃ geothermal temperature (equivalent to the condition of 4000 m deep burial) for 15 days. The results show that the rock structure was slightly changed, the content of Ca2+, the main component of the tail liquid, increased from 0 mg/L to 337 mg/L, and Mg2+ decreased to 2380 mg/L. Meanwhile, electron microprobe analyses show that the content of CaO in solid sample decreased from 61.000% to 60.830%, while the content of MgO increased from 0.296% to 0.350%. It is considered that the main elements Ca and Mg in solid and liquid samples experienced growth-and-decline changes before and after the reaction. An integrated comparative analysis was conducted by means of microscope observation, scanning electron microscope, stereoscopic microscope, electron microprobe analysis and X-ray diffraction analysis. Although the experiment failed to produce dolomitization, the result could provide constraints and experimental data support for further understanding of the conditions of dolomitization.

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曹 洁,张永生,龚庆杰,王俊涛,刘思宇,2010,深埋藏条件下鲕粒灰岩的热水交代实验研究[J].岩石矿物学杂志,29(4):397~402. CAO Jie, ZHANG Yong_sheng, GONG Qing_jie, WANG Jun_tao, LIU Si_yu,2010,The hydrothermal metasomatic experiment on oolitic limestone under the condition of deep burial[J]. Acta Petrologica et Mineralogica,29(4):397~402.

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