Climate and oceanographic changes during the Oceanic Anoxic Event 2 (OAE 2) and the Late Turonian–Coniacian Event (LTCE) are reported from a succession deposited in the central part of the Mexican Interior Basin, based on sedimentological, microfacies, mineralogical, and geochemical analysis. Typical δ¹³C positive excursions that characterize both the OAE 2 and the LTCE were identified. Organic-rich sediments during the initial stage of OAE 2 (before and around peak “A”, late Cenomanian) and the middle stage of LTCE (around the Hitchwood event) accumulated under increasingly warm and humid conditions, as evidenced by high chemical index of alteration values. Elevated concentrations of detrital proxies coupled with high phosphorus mass-accumulation rates suggest that this scenario led to a rise in detrital and nutrients fluxes that induced eutrophication and anoxic/dysoxic bottom waters. Eutrophic-anoxic/dysoxic marine conditions are further supported by the highest TOC values, coinciding with significant enrichments in redox- and productivity-sensitive trace elements. Moreover, these conditions can also be inferred from the abundant presence of radiolarians and filaments in the OAE 2 interval, and the occurrence of opportunistic foraminifera in the LTCE interval. Oxygen-depleted bottom waters are also indicated by Mo–U systematics. The onset of the Mexican Orogen tectonic uplift and increased upwelling strengthened the transference of nutrients, enhancing organic matter burial during the initial stage of OAE 2. In the mid-OAE 2 δ¹³C trough interval (between peaks “A” and “B”) equivalent to the Plenus Cold Event, bioturbated sediments with low TOC values accumulated during a short episode of cold climate conditions probably reflecting the southward flow of boreal water throughout the Mexican Interior Basin. The minimum δ³⁴S_py value occurring within the OAE 2 interval in the Mexican Interior Basin is lower than elsewhere because of a local increase in sulfate concentrations.

根据沉积学、微相、矿物学和地球化学，墨西哥内陆盆地中部沉积的地层报告了第 2 次大洋缺氧事件 (OAE 2) 和晚土伦期-柯尼亚期事件 (LTCE) 期间的气候和海洋学变化分析。典型的 δ ¹³确定了表征 OAE 2 和 LTCE 的 C 正偏移。OAE 2 初期（在“A”峰之前和附近，Cenomanian 晚期）和 LTCE 中期（Hitchwood 事件前后）富含有机物的沉积物在日益温暖和潮湿的条件下积累，如高化学指数所证明的那样改变值。碎屑代理浓度升高加上磷质量积累率高表明，这种情况导致碎屑和养分通量增加，导致富营养化和缺氧/缺氧底层水。最高 TOC 值进一​​步支持富营养缺氧/缺氧海洋条件，与氧化还原和生产力敏感微量元素的显着富集相吻合。而且，这些条件也可以从 OAE 2 间隔中大量存在的放射虫和丝虫以及 LTCE 间隔中机会性有孔虫的出现来推断。Mo-U 系统学也表明氧气耗尽的底部水域。墨西哥造山带构造抬升的开始和上升流的增加加强了营养物质的转移，在 OAE 2 的初始阶段增强了有机质埋藏。在 OAE 2 中期¹³ C 槽区间（峰“A”和“B”之间）相当于 Plenus 冷事件，在短暂的寒冷气候条件下积累的具有低 TOC 值的生物扰动沉积物可能反映了整个墨西哥内陆盆地的北方水向南流动. 由于局部硫酸盐浓度增加，墨西哥内陆盆地 OAE 2 区间内出现的最小 δ ³⁴ S _py值低于其他地方。