本文選題：大別超高壓變質(zhì)帶 + 重力-構(gòu)造力復(fù)合的靜水壓力模型��； 參考：《地學(xué)前緣》2017年02期

【摘要】：討論了地殼深部巖石處于"重力-構(gòu)造力復(fù)合的靜水壓力模型"。此模型的基本認(rèn)識(shí)為,地殼深部壓力是由重力應(yīng)力和構(gòu)造應(yīng)力引起的兩部分各向等應(yīng)力合成的,構(gòu)造應(yīng)力場(chǎng)的靜水壓力部分被稱為"構(gòu)造附加靜水壓力"。遵循這一認(rèn)識(shí),需要從總靜水壓力中先去掉構(gòu)造附加靜水壓力,進(jìn)而用構(gòu)造校正[深度=重力引起壓力/(總壓力-構(gòu)造附加的壓力)]的方法,進(jìn)行形成深度的測(cè)算。考慮巖石作為黏彈性體的應(yīng)力-應(yīng)變關(guān)系,作者用黏彈性本構(gòu)方程,獲得大別地區(qū)英山縣含柯石英榴輝巖的成巖深度≥30km,安徽岳西碧溪嶺地區(qū)含柯石英榴輝巖深度為23~53km,河南新縣地區(qū)的含柯石英榴輝巖成巖深度為36~40km。再進(jìn)一步用變質(zhì)深度的流變學(xué)公式,在黏性系數(shù)0.2×10~(23)條件下,推算出超高壓變質(zhì)巖形成深度約50~55km�？梢�(jiàn),大別超高壓變質(zhì)巖形成深度介于23~55km,而不是前人認(rèn)為的超過(guò)100km甚至更深,由此,"深俯沖-折返"模式需要科學(xué)的論證。本研究為高壓-超高壓變質(zhì)的"構(gòu)造增壓殼內(nèi)成因"提供了一些依據(jù)。
[Abstract]:This paper discusses the hydrostatic pressure model of deep crustal rocks in the composite of gravity and tectonic force. The basic understanding of this model is that the deep crustal pressure is composed of two isotropic stresses caused by gravity stress and tectonic stress, and the hydrostatic pressure part of tectonic stress field is called "tectonic additional hydrostatic pressure". Considering the stress-strain relation of rock as viscoelastic body, the author uses viscoelastic constitutive equation. Furthermore, using the rheological formula of metamorphic depth and under the condition of viscosity coefficient 0.2 脳 10 ~ (3), the formation depth of ultrahigh pressure metamorphic rocks is estimated to be about 50 ~ 55 km. It can be seen that the formation depth of Dabie ultrahigh pressure metamorphic rocks is between 2355 km, rather than the former thought that the depth is higher than 100km or even deeper. Therefore, the "deep subduction-reentry" model needs scientific argumentation. This study provides some basis for the formation of structural pressurized crust in high pressure-ultra-high pressure metamorphism.
【作者單位】： 中國(guó)地質(zhì)科學(xué)院地質(zhì)力學(xué)研究所;東華理工大學(xué)放射性地質(zhì)與勘探技術(shù)國(guó)防重點(diǎn)學(xué)科實(shí)驗(yàn)室;中國(guó)地質(zhì)大學(xué)(北京)地球科學(xué)與資源學(xué)院;北京大學(xué)地球與空間科學(xué)學(xué)院;中國(guó)地質(zhì)大學(xué)(武漢)地球科學(xué)學(xué)院;
【基金】：國(guó)土資源部科技發(fā)展重點(diǎn)項(xiàng)目“地殼深部壓力狀態(tài)與超高壓巖石形成研究”(2002201,2002—2005) 國(guó)家科委基礎(chǔ)研究特別項(xiàng)目(國(guó)科高字[1994]83號(hào)) 國(guó)家計(jì)委科技找礦項(xiàng)目(JG947110) 國(guó)家自然科學(xué)基金項(xiàng)目(49572149)
【分類號(hào)】：P588.3

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本文編號(hào)：1792802