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Your search keyword '"Li, Sanzhong"' showing total 21 results
Start Over Author "Li, Sanzhong" Publisher american geophysical union (agu)
21 results on '"Li, Sanzhong"'

1. What Causes Excess Deepening of the Sediment Mixed Layer in the Deep Ocean?

Author

Zhu, Zenghui, primary, Yu, Huaming, additional, Bianchi, Thomas S., additional, Lian, Ergang, additional, Burnett, William C., additional, Paytan, Adina, additional, Guo, Xiaoyi, additional, Zhao, Shibin, additional, Zhuang, Guangchao, additional, Men, Wu, additional, Li, Sanzhong, additional, Yu, Zhigang, additional, and Xu, Bochao, additional

Published
2024
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5. Magnetic Fingerprints for the Paleoenvironmental Evolutions Since the Last Deglaciation: Evidence From the Northwestern South China Sea Sediments

Author

Sun, Qishun, Jiang, Zhaoxia, Xiao, Chunfeng, Chen, Long, Liu, Wanxin, He, Kuang, Guan, Yulong, Zhang, Yuzhen, Wang, Haosen, Chen, Liang, Yin, Zhengxin, Li, Sanzhong, Sun, Qishun, Jiang, Zhaoxia, Xiao, Chunfeng, Chen, Long, Liu, Wanxin, He, Kuang, Guan, Yulong, Zhang, Yuzhen, Wang, Haosen, Chen, Liang, Yin, Zhengxin, and Li, Sanzhong

Abstract

Rapid global changes since the last deglaciation can be well documented in marginal sea sediments, while isolating individual paleoenvironmental signals is still challenging. Here, we identified magnetic minerals and unmixed their variations in sediments from the northwestern South China Sea to decipher environmental variations since the last deglaciation. The variation in the hematite to goethite ratio indicates a relatively drier mid‐Holocene and a wetter early and late Holocene in the Red River catchment. The position shift and intensity variation of Western Pacific Subtropical High may account for the Holocene precipitation changes. A higher chemical weathering intensity accompanied by a relatively more fine‐grained magnetite input during the last deglaciation suggests decoupling of the Asian Summer Monsoon and chemical weathering in the catchment, which might have been caused by the shelf exposure during the deglaciation. In addition, the relative abundance of biogenic magnetite increased with the sea level and possible deep‐water temperature rise. Therefore, magnetic minerals such as hematite, goethite, detrital and biogenic magnetite are markedly potential fingerprints for continent‐ocean environmental changes.

Published
2024
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10. Exploration of Deep Ocean Ferromanganese Nodule Fields Using Radon as a Tracer

Author

Guo, Xiaoyi, primary, Xu, Bochao, additional, Yu, Huaming, additional, Burnett, William C., additional, Li, Sanzhong, additional, Lian, Ergang, additional, Zhu, Zenghui, additional, Zhao, Shibin, additional, Chen, Guangquan, additional, Duan, Xiaoyong, additional, Dimova, Natasha, additional, Wang, Yanni, additional, Zhuang, Guangchao, additional, and Yu, Zhigang, additional

Published
2022
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12. The Magnetic and Color Reflectance Properties of Hematite: From Earth to Mars

Author

Jiang, Zhaoxia, Liu, Qingsong, Roberts, Andrew P., Dekkers, Mark J., Barrón, Vidal, Torrent, José, Li, Sanzhong, Paleomagnetism, and Paleomagnetism

Subjects
Geophysics, cation substitution, color reflectance spectroscopy, Mars, magnetic properties, remagnetization, hematite
Abstract

Hematite is a canted antiferromagnet with reddish color that occurs widely on Earth and Mars. Identification and quantification of hematite is conveniently achieved through its magnetic and color properties. Hematite characteristics and content are indispensable ingredients in studies of the iron cycle, paleoenvironmental evolution, paleogeographic reconstructions, and comparative planetology (e.g., Mars). However, the existing magnetic and color reflectance property framework for hematite is based largely on stoichiometric hematite and tends to neglect the effects of cation substitution, which occurs widely in natural hematite and influences the physical properties of hematite. Thus, magnetic parameters for stoichiometric hematite are insufficient for complete analysis of many natural hematite occurrences and can lead to ambiguous geological interpretations. Remagnetization, which occurs pervasively in red beds, is another ticklish problem involving hematite. Understanding red bed remagnetization requires investigation of hematite's formation and remanence recording mechanisms. We elaborate on the influence of cation substitution on the magnetic and color spectral properties of hematite, and on identifying hematite and quantifying its content in soils and sediments. Studies of remagnetization mechanisms are discussed, and we summarize methods to discriminate between primary and secondary remanences carried by hematite in natural samples to aid primary remanence extraction in partially remagnetized red beds. Although there remain unknown properties and unresolved issues that require future work, recognition of the properties of cation-substituted hematite and remagnetization mechanisms for hematite will aid identification and interpretation of the magnetic signals that it carries, which is environmentally important and responsible for magnetic signals on Earth and Mars.

Published
2022

18. TTG‐Adakitic‐Like (Tonalitic‐Trondhjemitic) Magmas Resulting From Partial Melting of Metagabbro Under High‐Pressure Condition During Continental Collision in the North Qaidam UHP Terrane, Western China

Author

Yu, Shengyao, primary, Zhang, Jianxin, additional, Li, Sanzhong, additional, Santosh, M., additional, Li, Yunshuai, additional, Liu, Yongjiang, additional, Li, Xiyao, additional, Peng, Yinbiao, additional, Sun, Deyou, additional, Wang, Zhengyi, additional, and Lv, Pei, additional

Published
2019
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