【摘要】：針對(duì)大別一帶超高壓變質(zhì)作用的形成深度存在兩種觀點(diǎn):其一是形成深度可用靜流體公式h=p/(ρg)算出,并得出變質(zhì)作用形成于90km或更深處;其二是超高壓是重力、構(gòu)造力和其他力合成的,并不只是重力的作用,從而該變質(zhì)作用可以在地殼內(nèi)形成。地下的巖石處于固態(tài),而靜止流體公式不適用于固體。事實(shí)上,圍壓不僅來(lái)自重力,而且也來(lái)自構(gòu)造力和其他力,所以合理的求深度算法應(yīng)該是從總壓力中減去構(gòu)造力獲得純重力才可用來(lái)計(jì)算深度。還簡(jiǎn)要解釋了諸如剪應(yīng)力、差應(yīng)力、構(gòu)造力等概念。
[Abstract]:There are two viewpoints on the formation depth of UHP metamorphism in Dabie area: one is that the formation depth can be calculated by h=p/ (蟻 g), and the metamorphism is formed in 90km or deeper, the other is that the UHP is gravity. Tectonic forces and other forces combine not just gravity, so the metamorphism can take place in the crust. Underground rocks are solid, but the stationary fluid formula does not apply to solids. In fact, the confining pressure comes not only from gravity, but also from tectonic and other forces, so the reasonable depth calculation algorithm should be to subtract the tectonic force from the total pressure to obtain the pure gravity to calculate the depth. Concepts such as shear stress, differential stress and tectonic force are also briefly explained.
【作者單位】： 北京大學(xué)地球與空間科學(xué)學(xué)院;中國(guó)地質(zhì)科學(xué)院地質(zhì)力學(xué)研究所;中國(guó)地質(zhì)大學(xué)(北京)地球科學(xué)與資源學(xué)院;
【基金】：國(guó)土資源部科技發(fā)展計(jì)劃項(xiàng)目“地殼深部壓力與超高壓巖石形成研究”(2002201) 國(guó)家計(jì)委科技找礦項(xiàng)目(JG947110) 國(guó)家科委基礎(chǔ)司特別支持項(xiàng)目(國(guó)高科[1994]83)
【分類號(hào)】：P588.3

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