A marine geophysical study of the Wilkes Land rifted continental margin, Antarctica
A marine geophysical study of the Wilkes Land rifted continental margin, Antarctica
复制标题
南极洲威尔克斯地裂谷大陆边缘的海洋地球物理研究
DOI：
10.1111/j.1365-246x.2008.04066.x
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发表时间：
2009
影响因子：
2.8
通讯作者：
H. Stagg
中科院分区：
文献类型：
--
作者：
D. Close;A. Watts;H. Stagg
南极洲东部的威尔克斯陆缘是形成于晚白垩世的非火山裂谷边缘，与南澳大利亚陆缘接合。在2000年至2001年和2001年至2002年期间，澳大利亚地球科学公司获得了∼10000线公里的边缘地震反射和折射、磁异常和重力异常数据。我们利用地震资料估算了边缘地区的沉积厚度。这些数据揭示了一个深(11公里)的裂谷盆地，它包含了西威尔克斯陆地的托滕冰川向海方向超过9公里的沉积物。大洋和大陆地壳的界限是模棱两可的，它们是后裂谷后的厚的，而裂谷前和裂谷前的沉积物则明显较薄。地震反射数据显示沿边缘有30-100公里宽的陆-洋过渡带(COTZ)。Cotz向位于Wilkes陆地/Terre Ad‘Elie地区东部陆架分界线的海面延伸400多公里
SUMMARY The Wilkes Land margin of East Antarctica, conjugate to the southern Australian margin, is a non-volcanic rifted margin that formed during the Late Cretaceous. During 2000–01 and 2001–02, Geoscience Australia acquired ∼10 000 line km of seismic reflection and refraction, magnetic anomaly and gravity anomaly data over the margin. We have used the seismic data to estimate the sediment thickness along the margin. The data reveal a deep (>11 km) rift basin that contains over 9 km of sediments seaward of the Totten Glacier, western Wilkes Land. The limits of oceanic and continental crust that underlies the thick post-rift and the significantly thinner pre- and syn-rift sediments are equivocal. Seismic reflection data suggest a 30–100 km wide continent–ocean transition zone (COTZ) along the margin. The COTZ extends over 400 km seaward of the shelf break off the eastern Wilkes Land/Terre Ad´ elie sector