| 西罗斯海阿黛尔盆地新生代构造特征及指示意义 |
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| 关键词:Adare Basin West Ross Sea seismic recognition magmatism glaciation |
| 基金项目:南北极资源环境考察与评价专项“南极周边海域海洋地球物理考察”(编号: ChinARE 2016-01-03)；中国博士后科学基金“南极西罗斯海新生代岩浆活动时空分布及其指示意义”(编号: 17090041)；国家海洋局第二海洋研究所专项资金项目“由罗斯海岩浆活动时空分布研究西南极裂谷系统特征”(编号: 14260-10) |
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| Cenozoic Tectonic Characteristics and Significance of the Adare Basin, West Ross Sea |
| Based on the geophysical data obtained from the Adare Basin and its adjacent areas, West Ross Sea, the authors employed the frequency wave-number filtering technique to recover the newly processed dataset with high signal noise ratio and complete seismic event which highly contributes to reveal more detailed deep-seated geological structures than previously thought. The structural features and magmatism of the study area in Cenozoic were classified and analyzed. Combined with glaciation, the associated sedimentary facies were summarized systematically. The authors’ analysis revealed that, at 16 Ma, under the influence of the thermal effect caused by residual magmatism and asymmetric spreading of Adare Basin in the initial period, surrounding areas of two flanks of the Adare trough were characterized by uplift folds and tilted uplift zone, respectively. The small-scale uplift fold zone was characterized by nearly upright faults and folds and was located in the southern part of the eastern flank, whereas the tilted uplift zone dominated in the corresponding district of western flank that reached the continental margin. By utilizing the contact relationship between igneous rocks and surrounding rocks, igneous rocks can be divided into two periods: early-stage and late Cenozoic igneous rocks. The early-stage rocks are generally located dispersedly in the tilted uplift zone and the age is poorly known. It is suggested that they were related to the residual magmatism. On the other hand, the spatial distribution of Late Cenozoic igneous rocks, formed not earlier 5.5 Ma, was extensive and scattered, almost covering the whole study area, which indicates that they might be unrelated to the rifting in space and time, instead they were affected by decompression melting of the mantle because of the large-scale deglaciation since Pliocene. |
| ZHANG Qiao,GAO Jin-yao,SHEN Zhong-yan,DING Wei-feng.2017.Cenozoic Tectonic Characteristics and Significance of the Adare Basin, West Ross Sea[J].Acta Geoscientica Sinica,38(4):479-493. |
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