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矿洞沟 -梁屯正长岩体侵位年龄为 2 175.4Ma ,是年代最古老的正长岩体之一。正长岩浆演化过程中发生了分离结晶作用。岩浆起源于亏损地幔与下地壳组分参予的混合源区 ,有上地壳物质的混染。该岩体是研究岩石圈发展早期碱性岩浆作用的极好标本。
The ore-hole ditch-Liang Tun normal-intrusion emplacement age is 2 175.4Ma, is one of the oldest syenite body. During the evolution of normal magmatism, crystallization occurred. Magma originates from the mixed source region where depleted mantle and lower crustal components participate, with contamination of upper crustal materials. The rock mass is an excellent specimen for studying the alkaline magmatic activity in the early lithosphere.