台湾东部海岸山脉出露了中新世璔生弧和弧前地体,它们被厚5—6千米由碰撞产生的上新—更新世沉积岩系复盖。当吕宋弧与中国大陆边缘碰撞时,弧前盆地变成碰撞盆地[本文非正式地称其为海岸山脉碰撞盆地(CRCB)],其位于生长山脉带和消亡弧之间。在 CRCB 层序中,底部泥岩、滑乱层和含砾泥岩被浊积岩(要为薄层扇缘和盆地平原相)和暴风雨沉积物(广泛分布的浅水受波浪影响的风暴沉积物)覆盖。局部的河道充填和峡谷充填层序含有大量粗砾—巨砾砾岩,而上更新世的中砾辫状河流沉积角度不整合地覆盖于海相岩石之上,根据该不整合可测定盆地隆起的年代。台湾以南的当代吕宋海槽可能为 CRCB 海相沉积提供了现代类比物,在相应于广泛分布的浅海相上新—更新世层序的宽阔浅陆架区,则明显缺乏这种类比物。这表明,碰撞早期产生的强烈沉降要比现今碰撞向南扩展所产生的沉降小。CRCB 在隆起及合并到造山带中之前,经历了沉降速率和沉积作用加快的过程,与众所周知的前陆盆地的模式是类似的。在中央山脉背翼,背向冲断层和背向褶皱明显地使造山载荷向东朝 CRCB 运移,在盆地隆起之前产生显著的沉降。弧—陆碰撞早期具有区域性沉积对称性,这可能反映了较深的构造作用的对称性。总之,应预期线状造山带从两个方向朝因构造负载作用而加深了的盆地横向散布岩屑。 The eastern coast of Taiwan revealed the Miocene arc and pre-arcuate terranes, which are covered by the Upper-Pleistocene sedimentary series of rocks 5-6 km thick produced by the collision. When the Luzon arc collided with the margins of the Chinese mainland, the pre-Arctic basin became a collision basin [informally referred to as the Coastal Borer Impact Basin (CRCB)], located between the growing mountain range and the extinction arc. In the CRCB sequence, the bottom mudstone, slippery layer, and brecciated mudstone are covered by turbidites (to be thin-margin and basin-plain) and storm sediments (extensively distributed wave deposits of shallow water) . The local channel filling and canyon filling sequence contains a large amount of gravel-pebble conglomerate, while the upper Pleistocene gravel braided river sedimentary unconformity covers the marine rock. According to the unconformity, the uplift of the basin Age. The contemporary Luzon trough south of Taiwan may provide a modern analogue for CRCB marine sediments, a clear absence of this analogue in broad shallow shelf areas corresponding to the Neo-Pleistocene sequence of the widely distributed shallow marine facies. This shows that the strong sedimentation induced early in the collision is smaller than that caused by the southward expansion of the current collision. Prior to the uplift and consolidation into the orogenic belt, the CRCB experienced a process of sedimentation rate and sedimentation acceleration similar to the well-known foreland basin model. On the dorsal wing of the Central Range, the back-thrust faults and back folds significantly shift the orogenic load to CRCB in the east, resulting in significant subsidence prior to the uplift of the basin. Early arc-continent collision with regional deposition symmetry, which may reflect the symmetry of the deeper tectonism. In conclusion, it is expected that the linear orogenic belts will spread the cuttings laterally in both directions toward the basins deepened by the tectonic load.