越南红河平原区新生代构造应力场特征

红河平原在新生代期间受印度板块、欧亚板块和太平洋板块三大板块的影响，其构造应力场复杂多样.通过研究红河平原新生代构造应力场的变化规律，确定在新生代早期红河平原地区的构造应力场特点为东西的挤压应力场与左旋走滑机制，晚期则转变为南北的挤压应力场与右旋走滑机制，且右旋走滑作用在东南部地区呈增加趋势.红河平原区的这种构造应力场的变化为对红河三角洲的形成和发展提供了条件，控制了红河平原地区的现代构造活动特征.

CHARACTERISTICS OF CENOZOIC TECTONIC STRESS FIELD OF THE RED RIVER PLAIN IN VIETNAM

Influenced by the Indo-Australian plate, Eurasian plate and Pacific plate, the Cenozoic tectonic stress field of Red River Plain was complex and diverse. Analysis on the variation of the Cenozoic tectonic stress field shows that the deformation in the Red River region is characterized by east-west sinistral compression in Early Cenozoic, while north-south dextral compression in Late Cenozoic, with an increasing trend of dextral slip compressive stresses in southeastern region. The variation of deformation in the Red River Plain provides conditions for the formation and development of the Red River delta and controls the modern north-south dynamic stress of the region.