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10 results on '"Zong, Xiulan"'

5. Provenance and Fluvial‐Aeolian Process of Kyzylkum Desert: Constrained by Detrital Zircon U–Pb Dating.

Author

Zhang, Mingyu, Song, Yougui, Shukurov, Shukhrat, Zhao, Linghao, Shukurov, Nosir, and Zong, Xiulan

Subjects
URANIUM-lead dating, PROVENANCE (Geology), PALEOGEOGRAPHY, DESERTS, ZIRCON, EOLIAN processes, WIND erosion
Abstract

The Kyzylkum Desert, as a transition area of different dust source in Central Asia, provides and reserves a large amount of dust transported by different atmospheric circulation systems, affecting Uzbekistan and downwind East Asia. However, there remains very few investigations about sediment sources and control factors of the desert. We hereby first present a provenance study on the Kyzylkum Desert, utilizing detrital zircon U‐Pb ages of samples composed of desert sand, alluvial sediments from Amu Darya River and piedmont of Southwest Tianshan Mountains. The results reveal that the Southwest Tianshan Mountains contribute the majority of the Kyzylkum desert sand, and the river system, dominated by Syr Darya, controls the sediment provenance of the desert. Moreover, little contribution from the Kyzylkum and Nurata segments indicates that wind erosion on the bedrocks is weak. However, the aeolian process is still crucial but deposit and storage of dust are determined by local topography. Plain Language Summary: The Arid Central Asia is commonly considered one of the most important dust sources in the world. The Kyzylkum Desert, located in the center of the multiple dust sources in Central Asia, provides and receives a large amount of dust, affecting Uzbekistan and downwind East Asia. However, research on sediment sources and control factors in the area is under debate. We investigate the potential provenance, spatial variability, and transport patterns of sand in the Kyzylkum Desert using detrital zircon U–Pb geochronology on 10 sediment samples. The results reveal that the Southwest Tianshan Mountains contribute the majority of the Kyzylkum desert sand, however, the proximal provenances also have a significant influence on the formation of the desert. The geomorphologic history shows that, the river system, dominated by Syr Darya, controls the sediment provenance of the Kyzylkum Desert. The wind displays little influence on the rework and recycle process of Kyzylkum Desert, indicated by inhomogeneous composition between northwest and southeast desert. The unmixing model results show evidence of sediments from the Kyzylkum Desert transported to the piedmont areas, but the transport and deposition of dust are primarily controlled by topography. Key Points: Detrital zircon U‐Pb dating indicates that the Southwest Tianshan Mountains are the primary sediment source of the Kyzylkum DesertThe river system controls the sediment provenance of the Kyzylkum DesertTopography determines reserve positions of the aeolian sand and dust from Central Asian deserts [ABSTRACT FROM AUTHOR]

Published
2024
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7. Assessing the effects of embedding resins on carbonate stable and clumped isotope analyses

Author

Organic geochemistry, Stratigraphy and paleontology, Organic geochemistry & molecular biogeology, Stratigraphy & paleontology, Guo, Jingjing, Zong, Xiulan, de Winter, Niels J., Goudsmit-Harzevoort, Barbara, Peterse, Francien, Ziegler, Martin, Organic geochemistry, Stratigraphy and paleontology, Organic geochemistry & molecular biogeology, Stratigraphy & paleontology, Guo, Jingjing, Zong, Xiulan, de Winter, Niels J., Goudsmit-Harzevoort, Barbara, Peterse, Francien, and Ziegler, Martin

Published
2023

9. Investigating Potential Links Between Fine-Grained Components in Loess and Westerly Airflow: Evidence From East and Central Asia

Author

Li, Yue, Song, Yougui, Fitzsimmons, Kathryn E., Dave, Aditi K., Liu, Yuming, Zong, Xiulan, Sun, Huanyu, Liu, Huifang, and Orozbaev, Rustam

Subjects
General Earth and Planetary Sciences
Abstract

Loess is a ubiquitous, silty aeolian sediment common across the semiarid to subhumid regions in the Northern Hemisphere. As such, the physical characteristics of loess sediment, such as modal grain size and quartz crystallinity index, have the potential to inform us about dust transport pathways and corresponding atmospheric circulation responsible for entrainment, transport, and deposition. In this article, we combine detailed granularity analyses and non-parametric end-member modeling with investigations of the quartz crystallinity index of three loess deposits, extending from East to Central Asia, with the aim of identifying dust transport processes and the climate subsystems responsible for them. We find marked differences in the grain size characteristics of Eastern and Central Asian loess. Given potential linkages of fine particles to the westerly jet stream, here we focused on the fine-grained end-members in the loess. The fine-grained components of the Central Asian Bishkek (BSK) and Chashmanigar (CMG) loess may be derived from individual particles carried at high altitude by major climate subsystems such as the westerlies. However, similar quartz crystallinity indexes of fine- and coarse-grained components in the Central Asian loess indicated that surface-level wind strength might influence the releases from proximal-sourced regions and abundances in the upper atmosphere for the fine particles. By contrast, the fine-grained component of the East Asian [Fanshan18 (FS18)] loess seems to yield physical similarities to the Tertiary Red Clays underlying many loess stratigraphies, and has been interpreted to relate to transport associated with the East Asian winter monsoon. It was further supported by quartz crystallinity indexes of the

Published
2022

10. High‐Resolution Intrashell Oxygen Isotope Studies of Cathaica fasciolaand Bradybaena ravidaLand Snails and Their Environmental Implications

Author

Li, Qianya, Dong, Jibao, Yan, Hong, Huang, Huayu, Zong, Xiulan, Wang, Guozhen, Liu, Chengcheng, Cao, Yunning, Liu, Weiguo, and An, Zhisheng

Abstract

Intrashell oxygen isotope (δ18Os) analyses of terrestrial snails have been carried out over two decades. However, the intraspecies/interspecies differences are not yet well understood. Here, we conducted a high‐resolution intrashell δ18Osstudy on 43 shells from Cathaica fasciolaand Bradybaena ravida, and 1449 δ18Osdata were obtained. These large amounts of data demonstrate the reproducibility of intrashell δ18Os. Our results suggest that C. fasciolaand B. ravidahave similar growing seasons mainly from March to October in the studied region. The ecological habits of the two species could explain the distinctive variations in their δ18Ossequences. Therefore, our study may interpret the discrepancy between the studies of land snail species and the stable/clumped isotopes of their shells. Moreover, the calculated average growth rate is ∼290 μm/day (from 250 to 330 μm/day) for nonadult C. fasciola. Thus, the use of snail shells for reconstructing high‐resolution terrestrial climate changes is promising. Land snails are sensitive to climatic and environmental changes. Therefore, the oxygen isotopic composition of snail shells (δ18Os) has often been used to study environmental changes. Researchers started to collect multiple samples from a single shell for δ18Osanalyses about two decades ago. However, it is still unclear whether high‐resolution intrashell δ18Osresults are repeatable and whether the influences of different individuals/species may exist. To address these issues, we collected 43 snail shells from Cathaica fasciolaand Bradybaena ravida. In total, 1449 δ18Osdata were obtained. The large amount of data showing similar variations in the intrashell δ18Osfrom different shells demonstrates the repeatability. Accordingly, our data suggest that the two species have similar growing seasons, mainly from March to October, although their ecological habits are different. In addition, the ecological habits of these two species could explain the subtle differences in their δ18Os. Taken together, our study could resolve the discrepancy between previous work on land snail species and stable/clumped isotopes. Furthermore, the estimated average growth rate is ∼290 μm/day (from 250 to 330 μm/day) for nonadult C. fasciola. Overall, snail shells are promising records for exploring high‐resolution terrestrial climate changes in the future. The intrashell δ18Osof land snails is reproducible, which mainly records the δ18O of precipitationCathaica fasciolaand Bradybaena ravidahave different ecological habits but similar growing seasonEcological habits could explain the discrepancy between studies of land snail species and stable/clumped isotopes The intrashell δ18Osof land snails is reproducible, which mainly records the δ18O of precipitation Cathaica fasciolaand Bradybaena ravidahave different ecological habits but similar growing season Ecological habits could explain the discrepancy between studies of land snail species and stable/clumped isotopes

Published
2024
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