Crustal structure of the Melanesian Area
Crustal structure of the Melanesian Area
复制标题
美拉尼西亚地区的地壳结构
DOI：
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发表时间：
1971
期刊：
影响因子：
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通讯作者：
H. W. Menard
中科院分区：
文献类型：
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作者：
G. Shor;H. K. Kirk;H. W. Menard
在美拉尼西亚边境地区（西起澳大利亚，东至新西兰和汤加之间的地区）进行的地震折射研究表明，地壳结构极为多样。豪勋爵海隆和诺福克海岭顶部有厚厚的沉积物，具有深厚的地壳根源和厚厚的物质层，其压缩波速度与澳大利亚大陆地壳相同。另一方面，Kermadec和Lau脊具有正常岛弧的典型结构和速度。南斐济海盆在结构上类似于一个有额外沉积物填充的海洋地区。斐济高原的西部沉积物很薄，具有正常深海盆地的结构，已经隆起了两公里。所有这些特征都符合这一假设，即该地区已被破坏，大陆物质的碎片已从澳大利亚块体中分离出来。
Seismic refraction studies in the Melanesian Borderland (the area between Australia on the west and New Zealand and Tonga on the east) show extreme diversity of crustal structure. The Lord Howe rise and the Norfolk ridge are topped by thick sediments and have deep crustal roots and thick layers of material with the same compressional wave velocity as the Australian continental crust. The Kermadec and Lau ridges, on the other hand, have structure and velocities typical of normal island arcs. The South Fiji basin structurally resembles an oceanic area with additional sedimentary fill. The western part of the Fiji plateau has thin sediments and has the structure of an area of normal deep-ocean basin that has been uplifted two kilometers. All the features are compatible with the hypothesis that the area has been disrupted and fragments of continental material have been separated from the Australian mass.