The Fukang Sag in the Junggar Basin is an important petroleum exploration and exploitation region. However, the geothermal regime and tectono-thermal evolution of the Fukang Sag, which control its hydrocarbon generation and conservation, are still controversial. This study involved a systematic analysis of the present-day geothermal gradient, heat flow, and thermal history of the Fukang Sag for better further exploration. According to the well log data and well-testing temperature data, we calculated that the geothermal gradient of the Fukang Sag ranges from 16.6 °C/km to 29.6 °C/km, with an average of 20.8 °C/km, and the heat flow ranges from 34.6 mWm⁻² to 64.3 mWm⁻², with an average of 44.6 mWm⁻². Due to the basement relief, they decrease from northeast to southwest. The weight averages of the single-grain apatite (U-Th)/He ages of the core samples are 1.3–85.2 Ma, and their apatite fission track ages range from 50.9 Ma to 193.8 Ma. The thermal modeling results revealed that the Fukang Sag experienced late Permian, late Jurassic, and late Cretaceous cooling events (although the timing and magnitude of these events varied among the samples), which were related to the continuous compression of the Junggar Basin. In addition, basin modeling indicated that the heat flow of the Fukang Sag decreased from 80 mWm⁻² in the Carboniferous to the current value of 44.6 mWm⁻². The Fukang Sag’s edge exhibits prolific hydrocarbon generation in the Carboniferous–Permian source rocks, while the Jurassic source rocks within the sag also undergo abundant hydrocarbon generation. This study provides new insights into the present-day geothermal field and tectono-thermal evolutionary history of the Fukang Sag, which are significant in terms of regional tectonic evolution and oil and gas resource assessment.

The continued subduction of the Izanagi‐Pacific Plate during the Meso‐Cenozoic resulted in multiple phases of regional exhumation in the eastern North China Craton, with significant influence on the thermal evolution across the Tan‐Lu Fault Zone (TLFZ). However, the exhumation response of the central TLFZ to the geodynamic transition in plate subduction remains poorly constrained. In this study, we collected new thermochronological data across the central TLFZ to reconstruct the thermal history. The thermal history results reveal that during 125–85 Ma, rapid exhumation occurred in the region, due to the subduction of the Izanagi Plate. Since ∼65 Ma, exhumation has decelerated abruptly surrounding the eastern branches and nearly ceased around the western branches. This differential exhumation response to the adjustment of westward subduction of the Izanagi‐Pacific Plate is potentially associated with the tectonic regime transition of the TLFZ. Our modeling results suggest that since ∼12 Ma, rapid exhumation in the TLFZ has been coincident in time with the renewed Philippine Sea Plate rotation, far‐field effect of the India‐Eurasia collision, and the enhanced Asian monsoon. This study documents the temporally and spatially varying exhumation processes in the TLFZ, offering insights into the correlation between the upper plate deformation and the oceanic plate subduction dynamics in the western Pacific.