| Autor: |
ZHUANG QiTian, HE HongLin, WEI RongZhu, WANG ZhongMei, SHI Feng, YAN JiYuan |
| Zdroj: |
Acta Sedimentologica Sinica; Apr2024, Vol. 42 Issue 2, p486-501, 16p |
| Abstrakt: |
[Objective] The Shanxi Graben System has become an important area of Late Cenozoic deformation research in eastern China for its unique tectonic location. However, due to the limitations of the outcrop profile, complete sedimentary environment evolution of the basins in the graben system is rarely reported, which hinders our understanding of its evolution process. [Methods] The depositional environments and provenance were analyzed using the detailed sedimentary record from the ZK01 borehole in the Taiyuan Basin. [Results and Conclusions] The analysis of the sedimentary environment shows that the Taiyuan Basin underwent a fluvial-delta/lake-river sedimentary environment evolution process. Two mega transgressions generated basin-wide lakes, one at ca. 5.8-4.4 and the other at ca. 2.2-1.6 Ma. Provenance analysis shows that the provenance was mainly the Jurassic quartz sandstones of the Taihang Mountain before 5.8 Ma. After 5.8 Ma, the provenance changed to the Triassic feldspathic sandstones, Meanwhile, the debris of metamorphic and volcanic rocks from the northern part of the Lvliang Mountain began to enter the basin, indicating the development of Fen River in the Taiyuan Basin. Asynchronous processes between paleoclimatic variations and transgressions illustrate the lakes' spreading processes as mainly influenced by tectonic subsidence, being a structural-geomorphic response to the eastward spreading of the Qinghai-Tibetan Plateau. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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