The post-Carboniferous evolution of Ireland: evidence from Thermal History Reconstruction
  • 【DOI】

    10.1016/S0016-7878(00)80087-5

  • 【摘要】

    Integration of Apatite Fission Track Analysis (AFTA?) and vitrinite reflectance (VR) data from onshore Ireland reveals a complex thermal history, characterized by multiple cooling episodes of late Car... 展开>>Integration of Apatite Fission Track Analysis (AFTA?) and vitrinite reflectance (VR) data from onshore Ireland reveals a complex thermal history, characterized by multiple cooling episodes of late Carboniferous, Jurassic, early Cretaceous, early Tertiary and late Tertiary age. Peak palaeotemperatures in each episode decrease through time to produce an overall long-term cooling trend since the late Carboniferous. Thermal history styles across the region are very similar, though the magnitude of peak palaeotemperatures in individual episodes shows some variation. Similar thermal histories are also identified in the surrounding offshore regions. The regional nature of all these palaeo-thermal episodes, and their correlation with regionally significant unconformities, suggests that heating was due primarily to greater depth of burial, with subsequent cooling representing the progressive unroofing of the present onshore region since late Carboniferous times. In Northern Ireland, explanations of early Cretaceous and early Tertiary palaeotemperatures in terms of greater depth of burial are more difficult to reconcile with geological evidence, and heating due to hot fluid movement appears more likely. This applies particularly to early Tertiary effects, for which the Tertiary Igneous Province provides a ready explanation. Over the entire onshore region, maximum maturity levels in Carboniferous and older units were reached at the end of the Carboniferous, and preservation of hydrocarbons to the present day, through several tectono-thermal episodes, appears unlikely. 收起<<

  • 【作者】

  • 【刊期】

    Proceedings of the Geologists' Association 2000年4期

  • 【语种】

    eng