| 燕山及邻区中新生代挤压与伸展的转换和成矿作用 |
| |
| 关键词:Yanshan compression extension ore-forming process |
| 基金项目:国家自然科学基金重点项目(40132020)，大地调项目“燕山地区中生代陆内造山过程地质记录调查”，国家攀登计划(G1999043214)，地质矿产部九五重点科技项目“燕山造山带造山作用过程及动力学机制” |
|
| 摘要点击次数: 2609 |
| 全文下载次数: 2045 |
| 摘要: |
| The Mesozoic-Cenozoic Compression and Extension Transformation Process and Ore-forming Process in Yanshan and Adjacent Area |
| The Mesozoic-Cenozoic compression and extension transformation process and ore-forming process in Yanshan and adjacent areas were studied on the basis of the geology of the regional unconformity, the evolution of faults, basins, metamorphic core complexes and magmatic activities in Mesozoic-Cenozoic. The authors consider that the Mesozoic-Cenozoic tectonic evolution process in Yanshan and adjacent areas was an alternately developing process of intracontinental (or intraplate) basin sedimentation and compression deformation in the basement of North China Craton. There occurred five times of compression deformation in the process, namely the compression deformations at the end of Middle Triassic (before Laohugou formation or Xingshikou Formation (≥215 Ma), Early Jurassic (before Haifanggou Formation or Jiulongshan Formation (≥178 Ma), Late Jurassic (before Yixian Formation or Donglingtai Formation (≥135 Ma), Cretaceous (before Paleogene, 65 Ma) and Paleogene (before Neogene, 25 Ma). These five compressions were relatively short in time. There also existed six periods of sedimentary basin formation that were longer in time and more gentle and extensional in tectonic activity between the five times of compression. The six periods of sedimentary basin formation are Early and Middle Triassic, Late Triassic and Early Jurassic, Middle and Late Jurassic, Cretaceous, Paleogene, Neogene and Quaternary. The main ore-forming periods agree with the extension in time. The distribution of exogenic ore deposits is controlled by the extension basins, whereas he distribution of endogenic ore deposits is controlled by the upwarping belts between the basins. In general, the compression tended to evolve from strong to weak, while the extension from weak to strong in the process. The compression was short in time, while the extension lasted longer in time. The compression and extension occurred alternately, and hence compression structures and extension structures developed alternately in the structural evolution. There existed a close genetic relation of the ore-forming process to the compression and extension transformation process in Mesozoic-Cenozoic. |
| MA Yin-sheng,WU Man-lu,ZENG Qing-li.2002.The Mesozoic-Cenozoic Compression and Extension Transformation Process and Ore-forming Process in Yanshan and Adjacent Area[J].Acta Geoscientica Sinica,23(2):115-121. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
|