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| 1 | A New Understanding of the Sedimentary Environment of the Laiyang Group in the Lower Cretaceous of Lingshan Island,Shandong Province,East China显示文摘The sedimentary background and sedimentary environment of the Lower Cretaceous of Lingshan Island,Shandong,remain unclear.There is considerable controversy as to whether the sedimentary environment was marine or continental.In this study,analyses were conducted with respect to indicators of paleosalinity,the chemical composition of clay,paleobiota,the characteristics of strata exhibiting salinization in eastern China during the Early Cretaceous,and the relationship between paleosalinity and paleoclimate.The results indicate that the sedimentary environment of the Lower Cretaceous Laiyang Group of Lingshan Island was that of a salified lake rather than a marine environment.This study not only provides a reference for determining the sedimentary environment of the Lower Cretaceous Laiyang Group of Lingshan Island but also offers a new perspective for the study of Cretaceous strata with salinization characteristics in eastern China. | ZHANG Xiangyu LI Shoujun ZHAO Xiuli GENG Geng YAN Mingming | 2020 | Acta Geologica Sinica(English Edition)2020，94，5： | 1 |
| 2 | First Record of Cyclocarya from the Early Oligocene Qaidam Basin,North Tibet:Implications for the Paleogeography and Paleoecology显示文摘As the largest intermontane basin in the northeastern Tibetan Plateau(TP),the Qaidam Basin provides unique insight into paleoclimatic change and its relationship with global change and uplift on the TP.In this study,based on morphological comparison,fossil fruit of Cyclocarya from the Early Oligocene Shangganchaigou Formation in the Qaidam Basin is assigned as Cyclocarya cf.weylandii.The discovery of Cyclocarya cf.weylandii demonstrates the occurrence of Cyclocarya in the Oligocene sediment in Qaidam Basin.This is the first record of Cyclocarya fossil of Early Oligocene Age in China and indicates that Cyclocarya has existed on the northeastern TP since at least the Early Oligocene.The living analogues of the current fossil now lives in sub-tropical China,where the East Asian Monsoon is prevalent.Integrating the new fossils and previously reported fossil remains of plants and fishes,it can be inferred that the Early Oligocene Qaidam Basin was primarily influenced by westerly circulation and had a relatively warm and humid climate,which was in sharp contrast to the present-day climate in Qaidam Basin. | Yafei Hou Bowen Song Xiangchuan Li Fang Han Xu Zhang Kexin Zhang | 2024 | Journal of Earth Science2024，35，1： | 0 |
| 3 | Fluid Inclusions in Surface-temperature Halite: Sample Preparation and Application显示文摘Paleo-temperature and paleo-environment can be interpreted from measuring homogenization temperatures of fluid inclusions within halite. In order to conduct such measurements, vapor bubbles within low-temperature fluid inclusion often need to be created through cooling process by using cooling stage or freezer. Proper cooling is critical for interpreting measured temperature data. We tested two common cooling methods, using heating/freezing stage and freezer, for studying fluid inclusions in halite precipitated in laboratory at conrtolled temperature of 25℃. While using the heating/freezing stage, halite samples were kept at-18℃ for 40–50 min; whereas for freezer, samples were stored at-18℃ for 1, 10, 20 and 40 days, respectively. By comparing the homogenization temperatures of the two cooling processes, we explored the detailed experimental processes and developed an optimal cooling nucleation procedure for homogenization temperature analyses of fluid inclusions within surface-temperature halite. The results show that the maximum homogenization temperatures from both methods approximate the actual brine temperature of 25℃. However, extended refrigeration time has noticeable influence on the results. The refrigeration time of the experiment can be shortened to meet requirements. | WANG Mingquan ZHAO Yanjun LI Wenxia LIU Chenglin | 2018 | Acta Geologica Sinica(English Edition)2018，92，4： | 0 |
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