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通过对扬子地块东部与Cu-Au等金属成矿有关的燕山期侵入体岩进行元素和同位素地球化学研究,揭示出:(ⅰ)扬子地块东部许多与金属成矿有关的侵入岩为埃达克质岩,它们可能主要由玄武质下地壳物质在增厚的条件下熔融形成,玄武质岩浆的底侵作用可能为这些岩石的形成提供了热量:(ⅱ)高压(1.2～4.0 GPa)、高温(850～1150℃)的下地壳环境不仅有利于流体的产生,而且也有利于埃达克质岩浆的产生.形成于高压高温条件下的埃达克质岩浆不仅能够携带大量流体和Cu-Au等成矿金属物质,而且易于将这些物质带到地壳浅处,有利于Cu-Au等金属矿床的形成.
Elemental and isotopic geochemical studies of the Yanshanian intrusive rocks associated with metallogenic Cu-Au and other metals in the eastern part of the Yangtze block revealed that: (i) many intrusions associated with metallogenesis in the eastern Yangtze block are A Dacitic rocks, which may have been formed mainly by the melting of basaltic lower crustal material under thickening conditions. The underplating of basaltic magmas may provide heat for the formation of these rocks: (ii) high pressures (1.2-4.0 GPa) The lower crustal environment at high temperature (850 ~ 1150 ℃) is not only conducive to fluid production, but also conducive to the production of adakitic magma.Adakitic magma formed under high pressure and high temperature not only can carry a large amount of fluid and Cu -Au and other metallogenic materials, but also easy to bring these materials to the shallow crust, is conducive to the formation of Cu-Au and other metal deposits.