本文選題：壓力差 + 構(gòu)造超壓　； 參考：《地學(xué)前緣》2017年02期

【摘要】：地質(zhì)學(xué)中普遍采用的壓力與深度轉(zhuǎn)化方法是基于阿基米德定律,該定律適用于重力場中的靜流體壓力條件下的壓力與深度關(guān)系。然而,由于巖石圈的高黏度與各向異性特性和構(gòu)造差應(yīng)力作用,決定了巖石圈內(nèi)的壓力分布和應(yīng)力分布受多種因素影響�；诮谛掳l(fā)表的研究成果,介紹了從顆粒尺度壓力差到巖石圈構(gòu)造超壓研究新進(jìn)展,討論了地質(zhì)學(xué)中的壓力與深度關(guān)系問題。近期研究表明,與靜壓狀態(tài)下獲得的壓力分布與深度關(guān)系相比,在差應(yīng)力條件下獲得的變質(zhì)反應(yīng)壓力和相變壓力要復(fù)雜得多。在差應(yīng)力條件下,從微觀尺度的變質(zhì)反應(yīng)和巖石顆粒間尺度到不同地質(zhì)體之間、地殼內(nèi)部構(gòu)造帶和巖石圈尺度都存在局部壓力非均勻分布(構(gòu)造超壓)。在強(qiáng)烈隆升的高原地區(qū),在高程差的重力勢作用下也可以出現(xiàn)構(gòu)造超壓。這種壓力非均勻的存在決定了變質(zhì)反應(yīng)壓力和礦物相變壓力不等同于靜巖壓力。熱-力學(xué)耦合數(shù)值模擬結(jié)果顯示,由于偏應(yīng)力作用,在大陸碰撞造山帶42km深度,構(gòu)造超壓達(dá)到2.2GPa,局部壓力達(dá)到3.4GPa,遠(yuǎn)高于平均靜巖壓力。由此推測,在40~50km深度,就有可能出現(xiàn)高壓-超高壓變質(zhì)作用。因此,根據(jù)變質(zhì)反應(yīng)和礦物相變確定的壓力不能直接換算成巖石圈深度。
[Abstract]:The commonly used pressure and depth transformation method in geology is based on Archimedes' law, which is applicable to the relationship between pressure and depth under hydrostatic pressure in gravity field. However, the pressure distribution and stress distribution in the lithosphere are influenced by many factors due to the high viscosity, anisotropy and tectonic differential stress of the lithosphere. Based on the recently published research results, this paper introduces the new progress in the study of the pressure difference between granular scale and lithospheric tectonics, and discusses the relationship between pressure and depth in geology. Recent studies show that the pressure of metamorphic reaction and the pressure of phase transition under differential stress are much more complex than those obtained under static pressure and the relationship between the pressure distribution and the depth. Under the condition of differential stress, from the metamorphic reaction of microscale and the scale of intergranular rock to different geological bodies, there is a non-uniform distribution of local pressure (tectonic overpressure) in the crustal inner tectonic belt and lithospheric scale. Tectonic overpressure can also occur in strongly uplifted plateau areas under the action of gravity potential of elevation difference. The existence of this non-uniform pressure determines that the metamorphic reaction pressure and the mineral phase transition pressure are not equal to the static rock pressure. The results of thermal-mechanical coupling numerical simulation show that the tectonic overpressure is 2.2 GPA and the local pressure is 3.4 GPA at the depth of 42km in the continental collision orogenic belt, which is much higher than the average static rock pressure. Therefore, it is inferred that high pressure-ultra high pressure metamorphism may occur at the depth of 40~50km. Therefore, the pressure determined by metamorphic reaction and mineral transformation can not be directly converted into lithospheric depth.
【作者單位】： 中國地震局地質(zhì)研究所地震動力學(xué)國家重點實驗室;
【基金】：國家自然科學(xué)基金項目(41374184) 地震動力學(xué)國家重點實驗室自主課題(LED2013A05,LED2015A04)
【分類號】：P542.5

【相似文獻(xiàn)】

相關(guān)期刊論文 前7條

1 李玉喜,龐雄奇,姜振學(xué);應(yīng)力、應(yīng)變與構(gòu)造超壓關(guān)系及構(gòu)造超壓控制因素分析[J];地球科學(xué);2003年02期

2 武紅嶺,董樹文;大別造山帶構(gòu)造超壓形成的碰撞力學(xué)機(jī)理[J];地球科學(xué)進(jìn)展;2001年04期

3 呂古賢，，劉瑞;重力和構(gòu)造力在地殼中的作用[J];高校地質(zhì)學(xué)報;1996年01期

4 王清晨,劉景波,從柏林;構(gòu)造超壓能引起超高壓變質(zhì)作用嗎?[J];科學(xué)通報;1999年21期

5 武紅嶺,董樹文;大別山陸—陸點碰撞和構(gòu)造超壓的形成[J];地球科學(xué);2001年05期

6 呂古賢;《地殼異常壓力學(xué)術(shù)研討會》在京召開[J];地球?qū)W報-中國地質(zhì)科學(xué)院院報;2000年03期

7 ;[J];;年期

本文編號：2024574