new constraints on Red Sea rifting from correlations of Arabian and Nubian Neoproterozoic outcrops
new constraints on Red Sea rifting from correlations of Arabian and Nubian Neoproterozoic outcrops
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阿拉伯和努比亚新元古代露头的相关性对红海裂谷的新限制
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
R. Attia
中科院分区：
文献类型：
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作者：
M. Sultan;R. Becker;R. Arvidson;P. Shore;R. Stern;Z. Alfy;R. Attia
通过对红海三分之二海岸线上阿拉伯和努比亚地盾的新元古代露头进行对比，获得了对红海开放机制的新限制。利用23幅陆地卫星专题测图仪场景(5×105平方公里)的镶嵌，结合野外、地球化学和地质年代学数据，我们识别和绘制了阿拉伯和努比亚地盾内的岩性单位、活动带和地体。如果阿拉伯围绕北纬34.6°，东经18.1°的极点旋转6.7°，地物最佳对齐。我们重建的影响包括：(1)红海下面的陆壳数量很少，因为恢复的红海海岸通常是并置的；(2)只需要一个极点，这意味着在红海裂谷期间，阿拉伯和努比亚地盾是刚性板块；(3)海岸线重新定向，以与先前存在的构造对齐，这表明裂谷部分沿着先前存在的薄弱地带传播，(4)沿红海长达350公里的大左旋位移不受支持。(5)极点与上新世-更新世沿死海转换的运动(极点：32.8°N，2 2.6°E+/−0.5°[Joffe and Garfunkel，1987])不一致，说明红海的开放需要一个以上的运动阶段。然而，我们的极点与死海变换的总运动的极点(极点：32.7°N，19.8°E+/−2°[Joffe and Garfunkel，1987])相似，表明阿拉伯和努比亚之间的运动与死海变换的总运动是平行的。
New constraints on the mechanics of Red Sea opening were obtained by correlating Neoproterozoic outcrops of the Arabian and Nubian Shields along two thirds of the Red Sea coastlines. Using a mosaic of 23 Landsat thematic mapper scenes (5×105 km²) together with field, geochemical, and geochronological data, we identified and mapped lithologic units, mobile belts, and terranes within the Arabian and Nubian Shields. Features best align if Arabia is rotated by 6.7° around a pole at latitude 34.6°N, longitude 18.1°E. Implications of our reconstruction include (1) the amount of continental crust underlying the Red Sea is small because the restored Red Sea coasts are typically juxtaposed, (2) only a single pole is needed, implying that the Arabian and Nubian Shields were rigid plates during Red Sea rifting, (3) coastlines reorient to align with preexisting structures, suggesting the rift propagated in part along pre-existing zones of weakness, (4) large sinistral displacements of up to 350 km along the Red Sea are not supported, (5) the pole is inconsistent with the Pliocene-Pleistocene motion along the Dead Sea transform (pole: 32.8°N, 22.6°E +/− 0.5° [Joffe and Garfunkel, 1987]), indicating that more than one phase of motion is required to account for the Red Sea opening. However, our pole is similar to that for the total motion along the Dead Sea transform (pole: 32.7°N, 19.8°E +/− 2° [Joffe and Garfunkel, 1987]), suggesting that the motion between Arabia and Nubia was parallel to the total motion along the Dead Sea transform.