广西河池五圩矿田构造应力场划分及力源探讨

五圩矿田位于广西南丹-河池锡多金属成矿带的南端,主干构造为NNW向的不对称短轴背斜,其上叠加了NE、SN、EW 3个方向的褶皱,它们在丹池带上都有表现.文章通过大量共轭节理、层面擦痕、断层派生小构造、次级褶皱等构造要素野外观测,室内计算,恢复了五圩矿田中生代(印支-燕山期) 4期构造应力场,各期主压应力方位依次为NEE、NW-SE、N WW-SEE及NNE向,前两期为印支期,后两期为燕山期.并探讨了其力源:印支期来源于古特提斯板块向北俯冲与江南古陆向南推移形成的SN向顺时针区域力偶;燕山期来源于丹池断裂的右旋或左旋走滑活动.

STYDT ON THE STAGES AND FORCE SOURCES OF TECTONIC STRESS FIELD IN WUXU ORE AREA,HECHI CITY,GUANGXI

The framework of structure in Wuxu ore field, which is located in the south part of Danchi Tin-polymetallic mineralization zone, is a NNW short-axis dissymmetric anticline. And there are other three orientation crossfolds (NE, SN, EW), which also well manifested in entire Danchi mineralization zone. Based on a large amount of original data and calculated results obtained from structure elements such as conjugate joint sets, bedding plane striations, fault derivative structures and subfolds, four stages of tectonic stress field are rehabilitated from Indosinian Epoch (first two) to Yenshan Epoch (second two) in Mesozoic Era. Furthermore, their sources of force are also discussed. The force of Indosinian Epoch comes from north-south regional clockwise forcecouple, which is composed of north subduction of Tethy plate and south displacement of Jiangnan palaeocontinent; the force of Yenshan Epoch is originated from the right-lateral or left-lateral strike slip of Danchi Fault.