地表Coesite形成机制研究的最新进展
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摘要
实验室合成柯石英(Coesite)静态最小合成压力Pcos,min数值的大小与地球深度的关系,是判断地球板块"深折返"或"浅折返"假说的依据。本文结合石英-柯石英的静高压实验数据,分别阐述了地球板块"深折返"和"浅折返"假说,提出了"地表柯石英无需经过板块折返,而可以通过强地震波和/或较大的局域应力作用于地表石英而形成;对于地表中处于失稳的局域状态石英,即使不大的地震波和/或较大的局域应力也可能触发而起作用导致柯石英的形成"的新假说。
The relation between Pcos,min values of Coesite synthesized in the laboratory and the depth of the earth is the basis for judging the hypothesis of "deep exhumation" and "shallow exhumation" of plate.This article,combining with the static high pressure experimental data of quartz-coesite,respectively expounds the hypothesis of "deep exhumation" and "shallow exhumation" of plate and puts forward the new hypothesis that the formation of Coesite in the earth's crust does not need plate exhumation but by violent seismic waves and/or the impact of larger local stress on surface quartz,and as for instable local state quartz,even weak seismic waves and/or larger local stress may trigger and lead to the formation of Coesite.
The relation between Pcos,min values of Coesite synthesized in the laboratory and the depth of the earth is the basis for judging the hypothesis of "deep exhumation" and "shallow exhumation" of plate.This article,combining with the static high pressure experimental data of quartz-coesite,respectively expounds the hypothesis of "deep exhumation" and "shallow exhumation" of plate and puts forward the new hypothesis that the formation of Coesite in the earth's crust does not need plate exhumation but by violent seismic waves and/or the impact of larger local stress on surface quartz,and as for instable local state quartz,even weak seismic waves and/or larger local stress may trigger and lead to the formation of Coesite.
引文
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[7]Langenhorst F,Poirier J P,Transmission electron microscopy of coesite inclusions in the Dora Maira high pressure metamorphicpyrope-quartzite[J].Earth Planet Sci Lett,2002(203):793-803.
[8]Ingrin J,Gillet Ph,TEM investigation of the crystal microstructures in a quartz-coesite assemblage of the Western Alps[J].Phys Chem Minerals,1986(13):325-330.
[9]刘曙娥,许大鹏,刘晓梅,等.地表柯石英的实验室模拟合成及其形成机制的研究[J].高压物理学报,2006,20(2):163-171.
[10]Su W H,Liu S E,Xu D P,et al.Effects of Local Mechanical Collision With Shear Stress on the Phase Transformation fromα-quartz to Coesite Induced by High Static Pressure[J].Phys Rev B,2006,73:14-110.
[11]孙敬姝,刘晓梅,许大鹏,等.高压变质二氧化硅矿物的合成及表征[J].高等学校化学学报,2006,27(11):2022-2025.
[12]Liu Liang,Zhang Junfeng,Green HW,et al.Evidence of former stishovite in metamorphosed sediments,implying subduction to>350km[J].Earth and Planetary Science letters,2007,263(3):180-191.
[13]孙岩,舒良树,陆现彩,等.岩石剪切面纳米粒子层的近期研究进展[J].自然科学进展,2008,17(10):1331-1337.
[2]Chao E C T,Shoemaker E M,Madsen B M.First Natural Occurrence of Coesite[J].Science,1960,132:220-221.
[3]Chopin C.Coesite and Pure Pyrope in High-Grad Bluechists of the Western Alps-AFirst Record and Some Consequences[J].Contrib Mineral Petrol,1984,86:107-118.
[4]Smith D C.Coesite in Clinopyroxene in the Caledonides and Its Implications for Geodynamics[J].Nature,1984,310:641-644.
[5]吕古贤,陈晶,李晓波,等.构造附加静水压力研究与含柯石英榴辉岩成岩深度测算[J].科学通报,1998,43(24):2590-2602.
[6]王清晨,刘景波,从柏林.构造超压能引起超高压变质作用吗[J].科学通报,1999,44(21):2346-2350.
[7]Langenhorst F,Poirier J P,Transmission electron microscopy of coesite inclusions in the Dora Maira high pressure metamorphicpyrope-quartzite[J].Earth Planet Sci Lett,2002(203):793-803.
[8]Ingrin J,Gillet Ph,TEM investigation of the crystal microstructures in a quartz-coesite assemblage of the Western Alps[J].Phys Chem Minerals,1986(13):325-330.
[9]刘曙娥,许大鹏,刘晓梅,等.地表柯石英的实验室模拟合成及其形成机制的研究[J].高压物理学报,2006,20(2):163-171.
[10]Su W H,Liu S E,Xu D P,et al.Effects of Local Mechanical Collision With Shear Stress on the Phase Transformation fromα-quartz to Coesite Induced by High Static Pressure[J].Phys Rev B,2006,73:14-110.
[11]孙敬姝,刘晓梅,许大鹏,等.高压变质二氧化硅矿物的合成及表征[J].高等学校化学学报,2006,27(11):2022-2025.
[12]Liu Liang,Zhang Junfeng,Green HW,et al.Evidence of former stishovite in metamorphosed sediments,implying subduction to>350km[J].Earth and Planetary Science letters,2007,263(3):180-191.
[13]孙岩,舒良树,陆现彩,等.岩石剪切面纳米粒子层的近期研究进展[J].自然科学进展,2008,17(10):1331-1337.
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