熊耳山地区滑脱拆离带的脆韧性转换机制

来源期刊：中南大学学报(自然科学版)1999年第2期

论文作者：唐诗佳 彭恩生 高光明 孙振家

文章页码：1 - 3

关键词：滑脱拆离带;脆韧性转换;围压效应;热液变质作用;岩性特征

Key words：detachment fault; brittle-ductile transition; confining pressure effect; hydrothermal metamorphism; lithologic feature

摘    要：河南熊耳山地区的滑脱拆离带由浅部到 深部为一脆性—脆韧性—韧性的断裂带．浅部盖层由于未遭受高温热液变质作用，所受围压和孔隙压力较小，表现为脆性变形；深部基底遭受了强烈的高温热液变质作用，岩石中赋存汽水流体较多，所受围压也较大，表现为韧性变形；而位于盖层与基底之间的拆离断层则由于高孔隙压力作用降低了部分围压效应，使之位于盖层与基底之间的拆离断层产生了脆韧性变形．这样在不同围压、流体、孔隙压力和高温热液变质作用等因素及构造应力的共同作用下，实现了本地区滑脱拆离带的脆韧性转换。

Abstract: From the upper to deep level, the glided detachment fault is a brittle and ductile fracture zone in Xiong′er Mountains. Without suffering hydrothermal metamorphism, and so with smaller confining and pore pressure, the upper cap shows brittleness; and the fundamental complex is ductile due to the strong hydrothermal metamorphism, more fluids and higher confining pressure. But the detached faults that lie between the upper and complex, show brittle-ductile transition because higher pore pressure decreases confining pressure. So the corporate actions of confining pressure, fluids, pore pressure, hydrothermal metamorphism and structural stress cause brittle-ductile transition in detachment faults.