Mesozoic cover over northern England: interpretation of apatite fission track data
Mesozoic cover over northern England: interpretation of apatite fission track data
复制标题
英格兰北部的中生代覆盖：磷灰石裂变径迹数据的解释
DOI：
10.1144/gsjgs.150.4.0657
复制
发表时间：
1993
影响因子：
2.7
通讯作者：
D. W. Holliday
中科院分区：
文献类型：
--
作者：
D. W. Holliday
形成英国湖区和奔宁山脉北部构造高点的古生代岩石是否曾经覆盖过相当厚的中生代覆盖岩，这是一个长期争论的话题，最近磷灰石裂变径迹分析（AFTA）研究又重新启动了这一话题。来自邻近盆地的证据表明，在新生代侵蚀之前，1200-1750 米的中生代覆盖层可能以前存在于高地。基于这种裂变径迹得出的古温度，对覆盖层厚度的较高估计（约 3000 m）是由于低估了新生代早期的表面温度，并且没有考虑到被侵蚀的覆盖层岩石的相对较低的导热率。出于类似的原因，对英国其他地方被侵蚀的盖岩的磷灰石裂变径迹估计也可能被证明是高估的。
Whether a significant thickness of Mesozoic cover rocks once rested upon the Palaeozoic rocks, which form the structural highs of the English Lake District and the Northern Pennines, is a subject of long debate which has been revived recently by apatite fission track analysis (AFTA) studies. Evidence from adjacent basins suggests that 1200–1750 m of Mesozoic cover was probably formerly present on the highs, prior to Cenozoic erosion. Higher estimates (c. 3000 m) of cover thickness, based on such fission track-derived palaeotemperatures, result from underestimation of early Cenozoic surface temperatures and from not allowing for the relatively low thermal conductivity of the eroded cover rocks. For similar reasons, apatite fission track estimates of eroded cover rocks elsewhere in Britain may also prove to be overestimates.