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以额尔齐斯构造带为例,研究了中、下地壳层次环境下逆冲推覆变形过程中流体-岩石相互作用.结果显示:变形过程中伴有显著的流体活动,大量的变形和分异构造与流体-岩石反应有关.流体作为一种传质介质,在构造动力成岩过程中对变形岩石中的化学成分起到明显的带入和迁出作用.这些流体可能来源于原岩(海相中酸性火山岩)和推覆体下盘岩石的孔隙水和矿物水,在构造加压和升温中的脱水反应形成流体流,并沿大型推覆滑脱面、透人性劈理面、S-C面理等由深部向浅部减压区迁移,流体迁移过程中的传质作用导致变形岩石成分变化.在挤压背景下的逆冲推覆带中,流体传质作用的土要机制为开放体系下的渗透或平流作用.
Taking the Irtysh tectonic belt as an example, the fluid-rock interaction during the thrust-nappe deformation in the middle and lower crustal gradients was studied.The results show that there are significant fluid activities, a great deal of deformation and fraction Heterogeneity is related to the fluid-rock reaction.As a mass-transfer medium, fluid plays a significant role in the chemical composition of deformed rocks during tectonic dynamic diagenesis.These fluids may originate from protoliths (sea Phase acidic volcanic rocks) and the pore water and mineral water of the nappe rocks in the nappe, forming a fluid flow during the dehydration reaction during tectonic compression and temperature elevation, along the large nappe slip surface, the human cleavage surface, the SC surface texture And so on from the deep to the shallow decompression zone migration, fluid migration process of mass transfer led to changes in the composition of deformed rock.In the thrust background thrust nappe zone, the mechanism of fluid mass transfer mechanism for the open system The infiltration or advection effect.