The formation of fold-thrust belts is driven by compressive stresses caused by crustal tectonics, gravity, or a combination of both. The formation mechanism of a single compressive stress component has been thoroughly investigated by laboratory experiments and field observations. It is yet less well established how fold-thrust systems deform under multiple compressional stresses. The formation of the deepwater fold-thrust belt on the northwest Borneo margin has been previously explained by compressive gravity-driven stresses in the south and crustal-driven tectonics in the north. This study focuses on the transition zone between the gravity-driven south and crustal-driven north, and investigates the structural diversity around this transition using 3D seismic-reflection data. Structural interpretation results reveal two structural provinces distinct in deformation styles and structural kinematics within the deepwater fold-thrust belt. Folds and thrusts in each structural province reflect deformation stresses that occurred at different times with different orientation. Structural features in each structural province developed independently and were preserved largely without mixing in the fold-thrust belt, except for an interference zone of ca. 15 km in width. The fold-thrust belt can be interpreted to have formed by a multi-directional compressive stress system and exhibits greater structural heterogeneity than deformation caused by a single-component compressive stress system. Particular deformation characteristics and fault activity in the interference zone reflect a complex disparate compressive stress relationship.

褶皱冲断带的形成是由地壳构造、重力或两者结合引起的压应力驱动的。通过实验室实验和现场观察，对单个压应力分量的形成机制进行了深入研究。折叠推力系统在多重压缩应力下是如何变形的还不太清楚。婆罗洲西北部边缘深水褶皱冲断带的形成先前已由南部的压缩重力驱动应力和北部的地壳驱动构造解释。本研究侧重于重力驱动的南部和地壳驱动的北部之间的过渡带，并使用 3D 地震反射数据研究了围绕该过渡的结构多样性。构造解释结果揭示了深水褶皱冲断带内变形风格和构造运动学不同的两个构造区。每个构造区的褶皱和逆冲反映了不同时期不同方位的变形应力。每个构造省的构造特征都是独立发展的，并且在褶皱冲断带中大部分都没有混合，除了大约 ca 的干扰带。宽15公里。褶皱逆冲带可以解释为由多向压应力系统形成，其结构异质性大于单分量压应力系统引起的变形。干涉带的特殊变形特征和断层活动反映了复杂的不同压应力关系。