期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
东印度洋东经90°海岭的地球物理特征和成因探讨
1
作者 朱佳豪 裴彦良 +3 位作者 支鹏遥 刘晨光 刘焱光 刘洋 《海洋科学进展》 CAS CSCD 北大核心 2024年第3期515-531,共17页
东经90°海岭发育于东印度洋,自孟加拉沉积扇向南穿越赤道直至印度洋南部布罗肯脊,是世界上最长的线性构造。海岭的形成机制与东印度洋晚白垩世至新生代的多阶段演化有关,由于其跨越赤道、长度大于5 000 km,南北不同区域的构造背景... 东经90°海岭发育于东印度洋,自孟加拉沉积扇向南穿越赤道直至印度洋南部布罗肯脊,是世界上最长的线性构造。海岭的形成机制与东印度洋晚白垩世至新生代的多阶段演化有关,由于其跨越赤道、长度大于5 000 km,南北不同区域的构造背景较为复杂,因此,其不同分段的地球物理特征也各具特色。通过分析海岭不同分段的形貌、浅层结构、重磁、地壳厚度及洋底年龄等地质地球物理数据,结合东印度洋海底扩张演化史,探讨了海岭的不同分段的成因机制。结果表明,90°E海岭的形成与板内热点活动、地幔柱-洋中脊相互作用、板块扩张与扩张中心跃迁,以及转换断层等诸多因素有关,是多种地质作用和地质过程综合作用的结果。2°N以北的海岭可能形成于远离扩张中心的印度板块内部,与板内火山作用有关联;18°S以南的部分形成于印度板块与南极洲板块边界转换断层附近;而2°N~18°S之间的中部区域则最为复杂,推测中段的形成受到了凯尔盖朗热点与沃顿扩张脊的相互作用,以及海岭下方的多次洋脊跳跃等因素的影响。分析认为,海岭中段是深入认识海岭成因机制、解决海岭构造演化和动力学机制以及脊-柱相互作用等重大科学问题的关键区域。未来在海岭中段开展地球物理测量及钻探工作,丰富海岭中段的地球物理综合数据,揭示中段不同位置岩石的物质组成与形成年代,是解决上述重大科学问题的必由之路。 展开更多
关键词 东经90°海岭 东印度洋 热点活动 构造演化
下载PDF
南海东北陆缘的地壳速度结构及其构造意义:来自广角地震剖面的约束 被引量:1
2
作者 赵俐红 刘欣悦 +5 位作者 支鹏遥 刘晨光 李官保 郑彦鹏 贺恩远 王星月 《地质学报》 EI CAS CSCD 北大核心 2023年第6期1766-1779,共14页
南海东北部深部地壳结构蕴含着南海陆缘伸展张裂过程的重要信息。在南海东北陆缘布设的一条广角地震测线(DP13)沿NW-SE方向依次穿过东沙隆起和台西南盆地。本文利用射线追踪和正演走时拟合软件RayInvr构建地壳纵波速度结构,模型表明:沉... 南海东北部深部地壳结构蕴含着南海陆缘伸展张裂过程的重要信息。在南海东北陆缘布设的一条广角地震测线(DP13)沿NW-SE方向依次穿过东沙隆起和台西南盆地。本文利用射线追踪和正演走时拟合软件RayInvr构建地壳纵波速度结构,模型表明:沉积层速度1.6~4.6 km/s,厚度0.5~3.8 km,横向分布不均匀,沉积基底起伏剧烈;莫霍面埋藏深度由陆架区的25.5 km急剧减小到陆坡下方的13 km,随后向下陆坡远端增深至16 km;陆架处东沙隆起下方地壳厚度从~25 km减薄到~21 km,下陆坡远端地壳厚约10~13 km,地壳拉张因子分别为1.3~1.5和2.6~3.1,表现为轻微和中等减薄;陆坡区台西南盆地内地壳厚度从17 km急剧减薄至7~8 km,地壳拉张因子高达4.6,呈超伸展减薄;地壳厚度由陆向海非单调减薄,地壳伸展具有明显的空间差异性;陆架-上陆坡和下陆坡下地壳底部发现两个相对孤立的不连续高速体,速度分别为7.0~7.5 km/s和7.0~7.3 km/s,厚度分别3~5 km和1~3 km,前者位于古太平洋俯冲带前缘,几乎与南海东北部高磁异常重叠,推测由中生代古太平洋板块俯冲后退相关的残余岩浆物质组成,后者则与张裂后期岩浆底侵有关。 展开更多
关键词 南海东北陆缘 地壳结构 地壳减薄 下地壳高速体
下载PDF
Shear Wave Speed Dispersion Characteristics of Seafloor Sediments in the Northern South China Sea 被引量:1
3
作者 KAN Guangming MENG Xiangmei +4 位作者 WANG Jingqiang CAO Guolin LI Guanbao LIU Baohua zhi pengyao 《Journal of Ocean University of China》 SCIE CAS CSCD 2022年第1期91-100,共10页
To accurately characterize the shear wave speed dispersion of seafloor sediments in the northern South China Sea,five types of sediments including silty clay,clayey silt,sandy silt,silty sand,and clayey sand were sele... To accurately characterize the shear wave speed dispersion of seafloor sediments in the northern South China Sea,five types of sediments including silty clay,clayey silt,sandy silt,silty sand,and clayey sand were selected,on which the measurements of the shear wave speed at 0.5-2.0 kHz and related physical properties were performed.Results reveal that the shear wave speed of sediments increases as the frequency increases,and the dispersion enhanced in the sediments in the order of silty clay,clayey silt,sandy silt,silty sand,and clayey sand,at a linear change rate of 0.727,0.787,3.32,4.893,and 6.967 m s−1 kHz−1,respectively.Through regression analysis,linear and logarithmic regression equations for the correlation between shear wave speed and frequency were established for each sediment type and the determination coefficients of regression equations indicate that the correlation is closer to a logarithmic relationship.The Grain-Shearing(GS)and Biot-Stoll models were used to calculate the shear wave speed dispersion of the five sediment types,and the comparison between theoretical prediction and measured results of shear wave speeds shows that the GS model can more accurately describe the shear wave speed dispersion characteristics of these sediments in the frequency band of 0.5-2.0 kHz.In the same band,the predictions obtained by using the Biot-Stoll model are significantly different from the measured data. 展开更多
关键词 shear wave speed dispersion seafloor sediments Biot-Stoll model Grain-Shearing model South China Sea
下载PDF
Effective Elastic Thickness of the Lithosphere in the Mariana Subduction Zone and Surrounding Regions and Its Implications for Their Tectonics
4
作者 LING Zilong ZHAO Lihong +2 位作者 WU Zhaocai zhi pengyao DING Renwei 《Journal of Ocean University of China》 SCIE CAS CSCD 2022年第4期827-836,共10页
To understand the rheology,structure,and tectonics of the lithosphere in the Mariana subduction zone and surrounding regions,we calculated the effective elastic thickness of the lithosphere(Te)in these areas using the... To understand the rheology,structure,and tectonics of the lithosphere in the Mariana subduction zone and surrounding regions,we calculated the effective elastic thickness of the lithosphere(Te)in these areas using the improved moving window admittance technique(MWAT)method.We find that smaller data grid spacing can better reflect Te variations in the subduction zone.The Te of the study region ranges from 0 to 47 km.The Te is reduced from 40 km on the seaward side of the outer-rise region to 1-2 km along the trench axis.The lithospheric breaking distance from the trench axis ranges from 0 to 250 km.We suggest that the intermediate Te values in seamounts and high Te values on the seaward side of the outer-rise region respectively reflect the‘fossil’rheological state and current lithospheric strength of the Pacific plate.The faulting induced by the downward bending of subducting plate not only ruptures the lithosphere but also contributes to the mantle serpentinization,significantly reducing the lithospheric strength.The largest breaking distance of the Ogasawara Plateau may be due to the increase in the mass load of the subducting plate in the Ogasawara Plateau and the significant horizontal bending force in the plate caused by the resistance of seamounts to subduction.Furthermore,a good positive correlation exists between the breaking distance and subduction dip angle along the trench axis.We suggest that the subducting plate with a larger breaking distance is likely to form a larger subduction angle. 展开更多
关键词 effective elastic thickness moving window admittance technique Mariana subduction zone plate bending
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部