Neoproterozoic glaciation in the mid-oceanic realm: An example from hemi-pelagic mudstones on Llanddwyn Island, Anglesey, UK
Neoproterozoic glaciation in the mid-oceanic realm: An example from hemi-pelagic mudstones on Llanddwyn Island, Anglesey, UK
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DOI：
10.1016/j.gr.2007.12.008
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发表时间：
2008-08
影响因子：
6.1
通讯作者：
T. Kawai;B. Windley;M. Terabayashi;H. Yamamoto;Y. Isozaki;S. Maruyama
中科院分区：
文献类型：
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作者：
T. Kawai;B. Windley;M. Terabayashi;H. Yamamoto;Y. Isozaki;S. Maruyama
我们报告了在英国威尔士Llanddwyn岛新元古代增生杂岩中属于海洋板块地层的洋中沉积物中首次出现的冰筏坠石。砂岩、燧石和玄武岩的坠石以基质支撑的外来碎屑形式出现在1米厚的半远洋基性泥岩中；最大的碎片直径为20×25厘米。这些坠石特别出现在半远洋基性泥岩中，这些泥岩位于记录脊-沟过渡的海洋板块地层构造顶部；它们是对陆架相浅海层序和弧后盆地中广泛存在的泥灰岩的补充。
We report the first occurrence of ice-rafted dropstones in mid-oceanic sediments belonging to an ocean plate stratigraphy within a Neoproterozoic accretionary complex on Llanddwyn Island, Wales, UK. Dropstones of sandstone, chert, and basalt occur as matrix-supported exotic clasts in a 1 m-thick, hemi-pelagic mafic mudstone; the largest clast is 20×25 cm across. These dropstones occur specifically in hemi-pelagic mafic mudstone that is located at the structural top of ocean plate stratigraphy that records a ridge-trench transition; they are supplementary to dropstones associated with extensive tillites reported in shallow marine sequences of continental shelf facies and in back-arc basins.