Correlation of the lower and middle Turonian chalks of south-west England and north-west France — condensation towards the Cornubian and Armorican massifs

IF 1.2 4区地球科学 Q2 Earth and Planetary Sciences

Proceedings of the Geologists Association Pub Date : 2026-02-01 Epub Date: 2026-02-05 DOI:10.1016/j.pgeola.2026.101163

Andy Gale

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Abstract

The condensation of lower and middle Turonian chalks towards the western margins of the Anglo-Paris Basin in SW England (UK) and Haute Normandie (northwest France) is investigated using basin-centre to basin-margin transects. Correlations are based on the identification of key marker beds and high-resolution microcrinoid biostratigraphy which enable detailed analysis of the patterns of condensation. Hardgrounds develop and become more intensely lithified and mineralised towards the basin margins. The formation of hardgrounds at the bases of the lower and the middle Turonian can be related to widely recognised eustatic sea-level events. The distribution of a hardground which underlies a major hiatus higher in the middle Turonian (Ogbourne–Tilleul) is related to reactivated thrusts in the Variscan Basement and its formation was caused by early (92.4 Ma) inversion in the Subhercynian Phase, generated by the collision of North Africa and Europe.

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英格兰西南部和法国西北部下、中Turonian白垩的对比——向Cornubian和armor美洲地块的凝结

利用盆地中心到盆地边缘的样带研究了英国西南部和上诺曼底（法国西北部）盎格鲁-巴黎盆地西部边缘的下、中Turonian期白垩系的凝结。相关性是基于关键标志层的识别和高分辨率微海百合生物地层学，可以详细分析凝结模式。硬地向盆地边缘发育，并变得更加强烈的岩化和矿化。下Turonian和中Turonian底部的硬地的形成可能与公认的海平面上升事件有关。在中Turonian （Ogbourne-Tilleul）较高的主要断陷下的硬地分布与Variscan基底的逆冲恢复有关，其形成是由北非和欧洲碰撞产生的下海西期早期（92.4 Ma）反转引起的。

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来源期刊

Proceedings of the Geologists Association 地学-地质学

CiteScore

2.70

自引率

8.30%

发文量

审稿时长

6-12 weeks

期刊介绍： The Proceedings of the Geologists'' Association is an international geoscience journal that was founded in 1859 and publishes research and review papers on all aspects of Earth Science. In particular, papers will focus on the geology of northwestern Europe and the Mediterranean, including both the onshore and offshore record. Following a long tradition, the PGA will focus on: i) a range of article types (see below) on topics of wide relevance to Earth Sciences ii) papers on aspects of Earth Science that have societal relevance including geoconservation and Earth management, iii) papers on palaeoenvironments and palaeontology of the Mesozoic and Cenozoic, iv) papers on aspects of Quaternary geology and climate change, and v) papers on the history of geology with particular reference to individuals that have shaped the subject. These topics will also steer the content of the themes of the Special Issues that are published in the PGA.