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首页> 外文期刊>Journal of Asian earth sciences >New and revised set of Cretaceous paleomagnetic poles from Hong Kong: implications for the development of southeast China
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New and revised set of Cretaceous paleomagnetic poles from Hong Kong: implications for the development of southeast China

机译：来自香港的新的和经修订的白垩纪古磁极对中国东南部发展的影响

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摘要

A paleomagnetic study of Upper Cretaceous (～ 80 Ma) dikes from Hong Kong was conducted with the aim of better understanding the Late Cretaceous-Cenozoic kinematic history of southeast China. Twelve out of seventeen sites collected from four dikes revealed primary TRMs and yield a Late Cretaceous paleopole at 69.3°N/211.2°E, where A_(95) = 8.9° and K = 107. A synthesis of South China Block Cretaceous poles indicates that Coastal Southeast China, which is bounded by the Lianhuashan Fault Zone to the northwest and the Changle-Nanao Fault Zone to the southeast, has moved relative to inland Central South China. The discordant Cretaceous paleopoles from the South China Block suggest a moderate net clockwise rotation of the Coastal Southeast China relative to Central South China since the Late Cretaceous. This clockwise rotation is probably the result of micro-blocks along the South China margin experiencing vertical-axis rotations in response to the penetrative dextral shear along the SE China margin during oblique suhduction of the Pacific Plate beneath South China. An alternative interpretation involves regional extension that displaced a raft-block southeastwards of the margin, generating apparent paleomagnetic records with no real block rotations.
机译：为了更好地了解中国东南部晚白垩世-新生代运动史，对香港上白垩纪（〜80 Ma）堤防进行了古磁研究。从四个堤防中收集的十七个地点中有十二个揭示了主要的TRM，并在69.3°N / 211.2°E处产生了晚白垩纪古极，其中A_（95）= 8.9°，K =107。华南地块白垩纪极的合成表明：东南沿海，以莲花山断裂带为界，西北为长乐—南脑断裂带，与华南中部内陆相对。来自华南地块的不协调的白垩纪古极表明，自白垩纪晚期以来，中国东南沿海地区相对于华南中部存在适度的顺时针净旋转。这种顺时针旋转可能是华南边缘微块经历垂直轴旋转的结果，这是对华南以下太平洋板块倾斜俯冲过程中沿东南中国边缘的渗透性右旋剪切的响应。另一种解释是涉及区域扩展，它使一个木筏块向边缘的东南方向移动，从而产生明显的古磁记录，而没有实际的块旋转。

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