Abstract:Qiangtang Basin is the largest Jurassic marine basin in China, located in the northern part of the Qinghai—Tibet Plateau, and thus, the Mesozoic marine succession has been well documented in this basin. A series of ocean anoxic events occurred during the sedimentary evolution of the Mesozoic Qiangtang Basin. This paper summarized the major achievements of these ocean anoxic events. The carbonate carbon- isotope record contains two different excursions across the marine T—J transition in the Qiangtang Basin. These are consistent with the “initial” and “main” negative carbon- isotope excursions (CIE) found in the global stratotype section and point (GSSP) of the T—J boundary. The depositional environments change from oxic to anoxic conditions across the T—J boundary. During the early evolution of basin, the carbon- isotope profile exhibits a distinct negative excursion in the Bilong Lake area. This excursion is similar to negative CIE found in GSSP of the Early Toarcian ocean anoxic event, suggesting that the Early Toarcian ocean anoxic event is extensive in the Qiangtang Basin. A large- scale regression occurred during the late evolution of the Qiangtang Basin. In this interval, the sediments only deposited in the Northern Qiangtang Depression consisting shale, oil shale, mudstone, and marl. A high- resolution carbon- isotope record from these strata revealed a characteristic and well- correlatable Barremian—Lower Aptian pattern. This result is consistent with well- preserved patterns observed in the southern, northern, and northwestern Tethys, suggesting that the Barremian ocean anoxic event was recorded in the Qiangtang Basin.