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首次报导了秦岭-大别山壳幔岩石高温高压下电导率的测定结果。该区中上地壳主要代表岩石(角闪岩、绢云母石英片岩、千枚岩等)在10—25km的温压条件下,含水矿物出现脱水会引起电导率值升高,认为这是该区出现高导层体的主要原因;中下地壳代表性岩石(片麻岩、麻粒岩、榴辉岩等)由于石英从α相向β相转变,会导致电导率值(σ)下降。在下地壳的温压条件下电导率值一般为10-2到10-3S·m-1;上地幔的代表性岩石由于组成矿物较为基性,电导率值比下地壳高,从0.1到1S·m-1。
For the first time, the conductivity of Qinling-Dabie Mountain crust and mantle under high temperature and high pressure was reported. The main representatives of the upper middle crust rocks (amphibolite, sericite quartz schist, phyllite, etc.) at 10-25km temperature and pressure conditions, the dehydration of water-bearing minerals will cause the conductivity value increases, that this is the area The main reason for the occurrence of high-conductivity bodies is that the lower crustal representative rocks (gneiss, granulite and eclogite) may lead to the decrease of conductivity (σ) due to the quartz transition from α phase to β phase. Under the conditions of temperature and pressure in the lower crust, the conductivity is generally 10-2 to 10-3S · m-1. The representative rocks in the upper mantle are higher in conductivity than the lower crust due to the more basic compositional minerals, ranging from 0.1 to 1S · m-1.