准噶尔内陆盆地沉积物通量变化与周边山体隆升

SEDIMENT FLUX AND MECHANISM FOR THE UPLIFTING OF THE MOUNTAIN SYSTEM AROUND THE JUNGGAR INLAND BASIN

关键词:  准噶尔内陆盆地  沉积物通量  山体隆升

Key words:  Junggar Inland Basin  sediment flux  uplifting of the mountain system

摘要:

本文根据地层厚度资料,对准噶尔内陆盆地晚二叠世一早第三世的沉积物通量进行了计算。计算结果表明,晚二叠世的沉积物通量(18.29×10⁶m³/a)比中生代一早第三纪(1.735×10⁶—3.142×10⁶m³/a)高出近一个数量级,因而推测晚二叠世是内陆盆地的主要成盆期。对盆地不同部位的沉积物通量进行比较发现,盆地南部沉积物通量最高,西北部次之.东北部最低。因此,古天山山系的升隆作用较之其他山系更为强烈,可能与其频繁的升降历史和塔里木陆块的推挤作用有关。

Abstract:

Based on the thickness of the strata,the Late Permian-Eogene sediment flux of the Junggar Inland Basin is calculated in this paper.The results have revealed that the Late Permian is the main basin-forming stage in the light of the Late Permian sediment flux (18.297×10⁶ m³/a) higher by nearly one magnitude than that of Mesozoic and Eogene (1.735×10⁶ to 3.142×10⁶m³/a).The comparison of the sediment flux in different parts of the basin suggests that the sediment flux is highest in the southern part,higher in the northwestern part,and lowest in the northeastern part in the basin.It is deduced that the uplifting of the Palaeo-Tianshan mountain system is much stronger than that of other mountain systems,which may be related to the history of the frequent rises and falls of its basement,and to the pushing and extruding of the Tarim continental block.