新疆库鲁克塔格新元古代—早古生代裂陷槽深水沉积与沉积-构造古地理

Deep-water Sedimentation and Sedimento-Tectonopaleogeography of the Neoproterozoic—Early Palaeozoic Aulacogen in Kuruktag, Xingjiang, China

根据库鲁克塔格、孔雀河露头区及其南盆内深部资料 ,尤其是多种类型的深水沉积的鉴别 ,得以建立区内地层及沉积相格架。分析表明 ,裂陷槽内南华系—奥陶纪地层属于同一构造环境的产物 ,沉积以深水陆棚 -槽盆相为主体 ,相带呈东西向展布 ,其空间分布范围比传统认识要广大得多。裂陷中心在孔雀河地区 ,南翼在盆内覆盖区北缘 ,原库鲁克塔格地区仅是其北翼 ;满加尔则是其南翼向南延的边缘坳陷 ,从而深化了其时空展布及构造演化历程。

Based on the deep investigation in the Kuruktag—Konqi River outcrop area and the Tarim basin, especially the recognition of deep-water sediments, frameworks of stratigraphic and sedimentary facies are established in this paper. Analysis indicates that Nahuaian-Ordovician strata of the aulacogen belong to the identical tectonic basin. They are characterized by well-development deep-water shelf facies and trough-basin facies, which are distributed alternatedly from north to south and show a regular variation and a W-E trend. Therefore, the spatial distribution of the aulacogen should be much larger than what has been thought before. The subsidence center of the aulacogen sits in the Konqi River area. Its north limb is in the Kuruktag area while the south limb in the northern part of the Tarim basin. The south part of the basin is the Manjiaer area, which is a marginal basin. Therefore, the temporal-spatial distribution and tectonic evolution of the Kuruktag aulacogen are clearly recognized.