As the north‐eastern margin of the North China Block, the Liaodong Peninsula has undergone multiple tectonic events during the Mesozoic, as well as simultaneous large‐scale gold mineralization. In this study, we focus on the history of Early Cretaceous basin formation, during the interval of time prior to and during a major extensional tectonic event that is characterized by formation of metamorphic core complexes (MCCs), detachment faults, and half‐graben basins. Two representative Early Cretaceous basins, the Tongyuanpu and Fangjiaweizi basins, expose two parts of the Xiaoling Formation (K1x); these two sequences, K1x1 of the Tongyuanpu Basin and K1x2 of the Fangjiaweizi Basin, were selected for detailed sedimentary and geochronological study. Both the K1x1 and K1x2 are dominated by sedimentary sequences of fluvial facies clastic rocks to volcani‐clastic and volcanic rocks. Clastic and volcanic rock samples, including three samples from the K1x1, four samples from K1x2, and one mafic dyke sample, were analysed for U–Pb on zircon, to constrain the crystallization ages for volcanic units and maximum deposition age (MDA) for clastic units. The zircon U–Pb age results date the K1x1 at ~135–127 Ma, while the K1x2 at ~127–122 Ma. Comparing the detrital zircon age peaks with the main potential source areas, provenance of both the K1x1 and K1x2 units was mainly from igneous rocks in the Liaodong Peninsula. Integrating our observations from the Tongyuanpu and Fangjiaweizi basins with those from other basins in the Liaodong Peninsula, we suggest south‐westward basin migration during the transition from transpressional basin formation to development of back‐arc extension basin. This basin migration responded to the tectonic transition from sinistral strike‐slip motion on the Tan‐Lu Fault to the rollback of the Paleo‐Pacific Plate coinciding with formation of MCCs. This tectonic transition and basin migration is important for understanding the transition from compression to extension in the eastern North China Block during the Early Cretaceous.
Abstract. With the continuous development of economic globalization, international economic and trade activities are becoming more and more frequent, and the scope of Chinese economic activities is also expanding. China's coastal urban economic development continues to deepen under the impetus of reform and opening up economic special zones construction, and coastal economic open belt is formed. Logistics economic development is an important area of China's economic and trade, and coastal logistics economic development is obvious in geographical advantage, and it closely interacts with international trade. The impact of coastal city logistics economic development on the development of international trade has been deepened. The impact of coastal city logistics economic development on international trade is analyzed in this paper to provide theoretical support for the internationalization of logistics economy.Since ancient times, the development of coastal cities has geographical advantage. The opening of Silk Road on the sea and the historical development of coastal ports open up a new space for coastal economic development. Since the reform and opening up, the establishment of special economic zones provides an empirical basis for coastal open city development. In an open economic environment, new development elements continue to emerge, providing more conditions for open economic development. Coastal city economy continues to deepen in the process of reform and opening up which provides an empirical basis for China's economic development. In open economic environment, the establishment of international trade and closer exchanges are important conditions for deepening economic development. In recent years, "The Belt and Road" and friendly exchanges in inter-country trade are more and more influential in the development of international trade. Under open economy, the rise of logistics is the product of the development of the times. It is with great potential and it has a catalytic role in the development of local economy and the construction of coastal economic zones. Logistics becomes a new economic growth point in China's coastal cities enterprises development. Transportation, storage facilities, information and communication, cargo packaging and handling infrastructure development have a certain scale, and they have certain material basis in the development of logistics industry. The development of regional logistics economy has geography characteristics. The available resources and conditions are important factors. China's coastal logistics and economic development is still in the process of continuous improvement. In global economic development environment, the deepening of logistics economy development will have a more far-reaching impact on international trade development.
China's coastal city logistics economy development status analysisChina's coastal cities relying on port advantages have more advantages in economic development. In recent years, the position of logistics economy is increasingly prominen...
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