| 摘要: |
| 概述盆地的发生、发展及演化,各自按照其所处环境的地球动力学状态、动力学性质,遵照一定规律进行。地球动力学性状,取决于盆地所处构造位置。不同构造单元、构造背景、构造环境中所形成的沉积盆地,其盆地的大小、形状、深浅,下沉及抬升的速度、周期、频率以及伴随构造演化各种特点的变化均不相同。这就极大地影响和控制了进入盆地的沉积物性质,包括沉积物的种类、组合、厚度等特点。 |
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| EVOLUTION OF THE QINLING MARINE BASIN AND THE “CHINESE-TYPE BASIN” |
| Zhang Ruilin |
| (Xi'an Institute of Geology and Mineral Resources) |
| Abstract: |
Up to now, the types of sedimentary basins have been discriminated according to the nature of the plate margin, basin position on or within a tectonic plate, etc.. It is suggested that the formation of the“Chinese-type basin”is dependent of block faulting and suture zones, but independent of subduction zones.
The author has researched into the evolution of the Qinling Basin, and contented that it was a typical Chinese-type basin during Devonian-Triassic time, as indicated by the following aspects.(1)The basin was located in the suture zone between two continental plates, then the two plates had not been conjuncted completely, but they actually stuck together.(2)Although the basin was in an epicontinental sea environment, intense rifting and subsidence occurred in the basin with a grabenhorst framework.(3)The formation of the basin was independent of subduction zones.(4)The basin formed after the first collision between continental plates was characterized by the tectonic model of the accordion-style extensional or compressional faulting.
There are large-sized lead-zinc-silver and mercury-antimony deposits resulted from exhalation-hydrothermal activity in the aulacogens developed in this kind of the basins. |
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