Analysis of Mn-depositis from the Briançon area, France

This text offers a general introduction to the geological history of the North-Tethys Platform from the Malm to the Lower Eocene periods. It is followed by three parts: a sedimentology development, a geochemical study and a part devoted to the reconstitution of the environment and the sedimentation rates, the subsidence, the depth and the morphology of the seabed and therefore the paleogeography of the Briançonnais domain. The last two chapters deal, one with the evolution of the Briançonnais domain in the context of events affecting Western Tethys and the Central Atlantic, and the other with two sedimentation models deduced from the previous study.

本文首先对北特提斯地台（North-Tethys Platform）在马尔姆阶（Malm）至始新统下部（Lower Eocene）时期的地质演化历史进行了系统性概述。随后本文包含三个核心章节板块：其一为沉积学特征演化分析，其二为地球化学专项研究，其三则聚焦于古环境重建、沉积速率、沉降作用、海底深度与形态特征，并据此阐明布里扬松域（Briançonnais domain）的古地理格局。本文最后两章分别展开论述：一章探讨了布里扬松域在受西特提斯（Western Tethys）与中大西洋（Central Atlantic）构造事件影响下的演化历程；另一章则介绍了基于前述研究成果推导得出的两类沉积模式。