A. Gilbert Smith’s scientific contributions

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Publications (1)


SOUTH ATLANTIC FITS
NORTH AND CENTRAL ATLANTIC FITS
The Fit of the Continents around the Atlantic
  • Article
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October 1965

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1,081 Reads

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1,203 Citations

Edward C. Bullard

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A. Gilbert Smith

The geometrical fit of the continents now separated by oceans has long been discussed in relation to continental drift. This paper describes fits made by numerical methods, with a `least squares' criterion of fit, for the continents around the Atlantic ocean. The best fit is found to be at the 500 fm. contour which lies on the steep part of the continental edge. The root-mean-square errors for fitting Africa to South America, Greenland to Europe and North America to Greenland and Europe are 30 to 90 km. These fits are thought not to be due to chance, though no reliable statistical criteria are available. The fit of the block assembled from South America and Africa to that formed from Europe, North America and Greenland is much poorer. The root-mean-square misfit is about 130 km. These geometrical fits are regarded as a preliminary to a comparison of the stratigraphy, structures, ages and palaeomagnetic results across the joins.

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Citations (1)


... 也即意味着龙木措-双湖-昌宁-孟连洋很可 能具有从西到东-剪刀式‖扩张的历史过程[18] 。这一过程很可能与早二叠世 -Pangea-B‖向晚二叠世-Pangea-A‖的转换有关。Pangea-A 模型最早来源于魏格纳 通过关闭大西洋将两侧的大陆进行拼合而形成的超大陆模型[1] , 但是在过去对Pangea 超大陆重建方案的研究中发现, 基于古地磁数据对 Pangea 超大陆早二叠 世古地理格局的重建, 需要将北方劳俄大陆(Laurussia)与南方冈瓦纳大陆 (Gondwana)错开一定的距离, 以协调两者之间可能存在的大范围陆块重叠, 也 就是 Pangea-B 模型。劳俄大陆和冈瓦纳大陆在石炭纪末汇聚形成的华力西造山 带, 在二叠纪期间可能发生过大规模的右旋走滑运动(Intra-Pangea dextral shear) [10] , 从而 Pangea-B 转换为 Pangea-A 的构造格局。根据 Li 等人 [110] 提出的超大陆 旋回模型, 从 Rodinia 超大陆裂解, 经 Gondwana 大陆阶段, 到形成最终的 Pangea 超大陆, 劳伦、波罗的和西伯利亚等大陆块体相对于冈瓦纳大陆, 从 4 亿年左右 东西向展布的 Rodinia 构造格局向 2 亿年前后南北向展布的 Pangea 格局, 发生了 显著的顺时针旋转运动, 并伴随着右旋走滑运动。因此, 从超大陆演化的历史进 程来看, 二叠纪劳俄/劳亚大陆相对于冈瓦纳大陆的右旋走滑运动, 即-Pangea-B‖ 向-Pangea-A‖格局的转化, 是 Rodinia 超大陆向 Pangea 超大陆演化过程中的必然 过程。在这个大规模右旋走滑运动(Intra-Pangea dextral shear)过程中, authors, E-mail: yanyongg@mail.sysu.edu.cn To reconstruct the movement history of continental blocks is crucial for understanding the Earth's system evolution and its dynamic mechanism. ...

Reference:

印支地块晚古生代以来运动历史的古地磁学重建:进展与展望
The Fit of the Continents around the Atlantic