The late Miocene is a crucial interval for global climate evolution as well as for the regional geodynamic evolution of the Central Mediterranean area. It spans the transition from the warm Mid Miocene Climatic Optimum, associated with the major Monterey Carbon Isotope Excursion, to the cooler Pliocene, characterized by a bipolar glaciation. Within this climatic transition, during the early Tortonian, a positive carbon isotope excursion related to a global carbon cycle perturbation is recorded, named Carbon Maximum 7 (CM7). In this study, two upper Serravallian–lower Tortonian carbonate ramps of the Central Mediterranean have been analysed: the Latium‐Abruzzi and the Apula ramps (Central Apennines, Central Italy). Carbon isotope ratios have been coupled with facies and microfacies analyses with the aims: (1) to identify the CM7 in the Central Mediterranean carbonate ramp successions; (2) to evaluate potential carbonate factory changes or demises related to the CM7; and (3) to discriminate the role of global vs regional factors in affecting the Mediterranean carbonate ramps. The two studied ramps show different evolutions due to regional geodynamics causes. The Latium‐Abruzzi ramp drowns in the Tortonian, while the Apula shows a regressive trend, with upper Tortonian middle ramp facies overlying the lower Tortonian outer ramp. Despite the complex geodynamic setting, a positive carbon isotope shift has been identified in both ramps and correlated with the CM7. This positive carbon isotope shift may be linked to the strengthening of the global ocean circulation during the late Miocene cooling. This strengthening of the circulation enhanced the coastal upwelling, bringing nutrient‐rich waters to the surface and triggering an enhanced primary productivity consistent with the CM7.

中文翻译：

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碳酸盐岩坡度记录C同位素变化的潜力：地中海中部上中新统的见解

中新世晚期是全球气候演变以及中地中海地区区域地球动力学演变的关键时期。它涵盖了从温暖的中新世中期最佳气候（与主要的蒙特雷碳同位素漂移相关）到凉爽的上新世（过渡为双极冰川）的过渡。在这种气候转变过程中，Tortonian早期记录了与全球碳循环扰动有关的正碳同位素偏移，称为碳最高7（CM7）。在这项研究中，已经分析了地中海中部的两个上塞拉瓦利阶-下托尔顿阶碳酸盐岩斜坡：Latium-Abruzzi斜坡和Apula斜坡（意大利中部亚平宁山脉）。碳同位素比已与相和微相分析相结合，目的是：（1）识别地中海中部碳酸盐岩坡道演替中的CM7; （2）评估与CM7相关的碳酸盐工厂的潜在变更或淘汰；（3）区分全球因素和区域因素在影响地中海碳酸盐岩坡度中的作用。由于区域地球动力学原因，两个研究坡道显示出不同的演化。Latium-Abruzzi坡道充斥于Tortonian中，而Apula呈回归趋势，较高的Tortonian中坡相覆盖在较低的Tortonian外坡上。尽管地球动力学设置复杂，但在两个坡道上都发现了正碳同位素位移，并且与CM7相关。这种正碳同位素位移可能与中新世末期冷却期间全球海洋环流的加强有关。