摘要
库车盆地在不同的演化阶段上具有不同的沉降特征.在三叠纪前陆盆地演化阶段,盆地的沉降范围较小,沉降中心在现今南天山山前及其以北的位置,沉降速率中等,平均为60m/Ma;在侏罗纪至早第三纪伸展盆地演化阶段,沉降范围明显增大,沉降中心在不断南移的同时还不断西迁.盆地沉降的幅度较小,沉降速率较低,平均仅25～30m/Ma;晚第三纪前陆盆地演化阶段,沉降中心进一步南移、东迁至现在的拜城凹陷和阳霞凹陷,沉降幅度较大,沉降速率较高,平均达133.3～200m/Ma,而上新世库车组沉积期则达到了1428m/Ma.
For Kuqa Basin, there has different subsiding features during its Mesozoic and Cenozoic evolution periods. In the evolving stage of the Triassic foreland basin, the subsiding area of Kuqa basin was relatively small, the subsiding center lay in the front of the South Tianshan Mountains and on its north, and the subsiding velocity was at medium level with the average value of 60 m/Ma. In the evolving stages of stretch basin from Jurassic to Paleogene, the subsiding centers were still moved to the south and west, so the subsiding area became bigger than that of the Triassic foreland basin, and the less extent and velocity (only 25～30 m/Ma) indicated that the subsiding process became feeble. Finally, in the evolving stages of the Cenozoic foreland basin from the sedimentary periods of Jidike to Kuqa Formation, the subsiding process the basin exhibited was so forceful that there generally had a very big depression area and a very high velocity with span of 133.3～200 m/Ma (there was a highest velocity of 1 428 m/Ma during the period of Kuqa formation depression).
出处
《浙江大学学报（理学版）》
CAS
CSCD
2004年第1期110-113,120,共5页
Journal of Zhejiang University（Science Edition）
基金
国家重点基金项目资助(编号49832040).
