In New Caledonia, upper Cretaceous to Palaeogene sedimentary rocks record a regional tectonic shift from Cretaceous extension to Eocene compression, which led to the obduction of oceanic mantle onto the northeastern tip of the submerged Zealandia continent. This study provides new descriptions of these successions in the region of the Gouaro anticline, from outcrops and an extensively cored, 1.9 km long onshore petroleum well, CADART-1. Combined sedimentological, palaeontological and mineralogical data allow us to propose a revised lithostratigraphic framework and to discuss sedimentary sources, basin physiography and vertical tectonic motions. The base of the studied section comprises an upper Cretaceous transgressive syn- to post-rift siliciclastic succession (Gouaro Formation) culminating in deepwater silicified mudstones. Our biostratigraphic analysis suggests that the Palaeocene and Lower Eocene are not present in the studied section. During the middle Eocene, sedimentation is dominated by deepwater pelagic carbonates and calciturbidites (Adio Limestone). The middle to upper Eocene is marked by a 4 km thick, lithologically heterogeneous turbidite succession, the Bourail Flysch Group, divided into: (i) the Lutetian to Bartonian Lower Bourail Flysch Formation, comprising mixed siliciclastic - calcareous turbidites; (ii) the Bartonian to Priabonian Middle Bourail Flysch Formation, dominated by calcareous turbidites; and (iii) the uppermost Eocene (to Oligocene?) Upper Bourail Flysch Formation consisting of clinopyroxene-rich volcaniclastic turbidites and extraformational breccias. Two successive phases of clastic fluxes occurred, the former during the Lutetian-Bartonian and the latter during the uppermost Priabonian, separated by a period of drowning and/or subsidence during the Bartonian to Priabonian. These phases are likely controlled by vertical motions and we discuss their possible tectonic origin. Of particular note is that we believe that within the Bourail Basin, horizontal shortening and nappe emplacement are only recorded during the latest Eocene and possibly Oligocene. Indeed, the second phase of clastic flux is associated with debris flow breccia, possibly derived from a thrust front, yet we discuss alternative origins such as fault scarp erosion or intraslope failures.

在新喀里多尼亚，上白垩纪至古近纪沉积岩记录了从白垩纪伸展到始新世压缩的区域构造转变，这导致了洋幔被诱到淹没的西兰西亚大陆的东北端。这项研究为古瓦罗背斜地区的这些演替提供了新的描述，从露头和宽心的1.9公里长的陆上石油井CADART-1开始。结合沉积学，古生物学和矿物学数据，我们可以提出修改后的岩石地层学框架，并讨论沉积源，盆地地貌和垂直构造运动。研究部分的基础包括上白垩统海侵-裂谷后的硅质碎屑演替（古阿罗组），最终形成深水硅质泥岩。我们的生物地层分析表明，在研究的部分中不存在古新世和下新世。在始新世中期，沉积以深水上层碳酸盐岩和钙铁矿（Adio石灰石）为主。中新世至上新世以4 km厚的岩性非均质浊积演替体Bourail Flysch群为标志，分为：（i）Lutetian至Bartonian下Bourail Flysch地层，包括硅质碎屑-钙质混浊浊积岩; （ii）以钙质浊质为主的巴通-普里亚邦阶中古布赖斯Flysch组；（iii）始新世（至渐新世？）最上层的Borail Flysch地层，由富含斜柏石的火山碎屑浊积岩和地层角砾岩组成。发生了两个连续的碎屑通量阶段，前者在Lutetian-Bartonian时期，后者在最高的Priabonian时期，在Bartonian到Priabonian时期被淹没和/或沉陷所隔开。这些阶段很可能受垂直运动控制，我们讨论了它们可能的构造起源。特别值得一提的是，我们认为，在Bourail盆地内，仅在最近的始新世甚至可能是渐新世期间才记录了水平缩短和推覆的位置。的确，碎屑流角砾岩的第二阶段与碎屑流角砾岩有关，可能来自逆冲锋面，但是我们讨论了诸如断层陡坡侵蚀或斜坡内破坏等其他成因。这些阶段很可能受垂直运动控制，我们讨论了它们可能的构造起源。特别值得一提的是，我们认为，在Bourail盆地内，仅在最近的始新世甚至可能是渐新世期间才记录了水平缩短和推覆的位置。的确，碎屑流角砾岩的第二阶段与碎屑流角砾岩有关，可能来自逆冲锋面，但是我们讨论了诸如断层陡坡侵蚀或斜坡内破坏等其他成因。这些阶段很可能受垂直运动控制，我们讨论了它们可能的构造起源。特别值得一提的是，我们认为，在Bourail盆地内，仅在最近的始新世甚至可能是渐新世期间才记录了水平缩短和推覆的位置。的确，碎屑流角砾岩的第二阶段与碎屑流角砾岩有关，可能来自逆冲锋面，但是我们讨论了诸如断层陡坡侵蚀或斜坡内破坏等其他成因。