Article
Geography, Physical
Xilin Cao, Xiaofei Hu, Baotian Pan, Qiming Zhao, Tai'an Chen, Xianghe Ji, Zhijun Zhao
Summary: Research indicates widespread distributed deformation along the northern front of the Qilian Shan, with deformation characterized by thrust-fault bends along the East Yumu Shan Fault. The terrace landform record of the Daciyao River provides valuable geomorphic markers for reconstructing cumulative deformation.
Article
Geosciences, Multidisciplinary
Hansheng Wang, Peng Gao, Rui Yang, Junsheng Nie, Bo Cao, Aifeng Zhou, Baotian Pan, Lin Chen, Tingjiang Peng
Summary: A clear understanding of the uplift history of the Tibetan Plateau is crucial in comprehending its uplift mechanisms and impacts on the Asian environment. However, a consensus on the uplift history has not been reached due to the lack of well-calibrated paleoaltimetry proxies and the knowledge of their correct application in the past. In this study, the first calibration equation between brGDGTs and mean annual air temperature (MAAT) has been established, providing a foundation for understanding the uplift history and environmental variations of the northeastern Tibetan Plateau area.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Chen Wu, Jie Li, Andrew V. Zuza, Peter J. Haproff, Xuanhua Chen, Lin Ding
Summary: The Proterozoic-Phanerozoic tectonic evolution of the Qilian Shan, Qaidam Basin, and Eastern Kunlun Range is crucial for the formation of the Asian continent, and understanding the paleogeography of these regions is vital for reconstructing the ancient central Asian oceanic domains. This study integrated new and existing geological field observations and geochronology to investigate the tectonic evolution of the Qilian-Qaidam-Kunlun continent and its relationships with the North China-Tarim continent and South China craton. The results reveal the subduction, collision, and rifting events that shaped these regions from the early Neoproterozoic to the Devonian.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2022)
Article
Geochemistry & Geophysics
Yanxiu Shao, Jerome van der Woerd, Jing Liu-Zeng, Daoyang Yuan, Yunsheng Yao, Xiaobo Zou, Pengtao Wang
Summary: Understanding the structure and dynamics of complex fault systems is crucial for assessing earthquake size and related hazards. In this study, the western Danghe Nan Shan thrust is analyzed as a major fault junction in north Tibet. Through fault mapping and geological observations, it is suggested that this thrust could potentially cause Mw 7+ earthquakes near the town of Subei.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geography, Physical
Qingying Tian, Eric Kirby, Wenjun Zheng, Huiping Zhang, Hao Liang, Zhigang Li, Weitao Wang, Tao Li, Yipeng Zhang, Binbin Xu, Peizhen Zhang
Summary: This study evaluates the erosion rates during the late Quaternary along the northern Qilian Shan, indicating that the landscape evolution in the monsoon region has undergone glacial-interglacial cycles over the past 200,000 years. Paleoerosion rates within the Hongshuiba watershed appear to have fluctuated between around 200 m/Myr during glacial episodes to 500-700 m/Myr during interglacial times, similar to recent erosion rates inferred from Be-10 in modern sediment.
Article
Geosciences, Multidisciplinary
Zhidan Chen, Wenbin Xu, Rui Liu, An Li, N. V. Koronovsky
Summary: In this study, the tectonic deformation of the western Qilian Shan is investigated using high-resolution digital elevation model (DEM) data and fluvial geomorphologic characteristics. The results show that the northern Qilian Shan experiences stronger crustal uplift and erosion compared to the central and southern ranges. The activity of NWW-trending faults in the western Qilian Shan is recorded by the deformed terraces of the Baiyang river. The vertical slip rates of three faults in the western Qilian Shan are constrained to be 0.31 +/- 0.06, 0.33 +/- 0.02, and 0.24 +/- 0.02 mm/a.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Xiaofei Hu, Xianghe Ji, Xilin Cao, Jiuying Chen, Baotian Pan
Summary: This study successfully revealed the fault geometry underlying an active fold by surveying a suite of river terrace surfaces. The re-evaluation of the region's deformation kinematics suggested that the dip slip along the decollement is mainly accommodated by two structures.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geography, Physical
Isaac Salem A. A. Bezerra, Afonso C. R. Nogueira, Marcelo B. Motta, Andre O. Sawakuchi, Thays D. Mineli, Arnaldo de Q. Silva, Antonio G. Silva Jr, Fabio H. G. Domingos, Giovanni A. T. Mata, Felipe J. Lima, Silvio R. L. Rike
Summary: This study analyzes the fluvial deposits associated with the Amazon River in central-eastern Amazonia and improves the chronostratigraphic framework of the region through geomorphological and sedimentary facies analyses, age dating, and sediment provenance data. The results show that the Amazon River has gradually eroded the valley in central-eastern Amazonia since the Late Miocene, forming abandoned fluvial terraces and an active floodplain.
Article
Environmental Studies
Valentino Demurtas, Paolo Emanuele Orru, Giacomo Deiana
Summary: The study explores the connections between tectonic activity and geomorphological evolution in the Pardu Valley and Quirra Valley in East Sardinia, showcasing how the geological indicators play a key role in shaping the landscape.
Article
Geosciences, Multidisciplinary
Yage Zhu, Faqi Diao, Rongjiang Wang, Ming Hao, Zhigang Shao, Xiong Xiong
Summary: Knowledge of lithospheric rheology provides fundamental insights into crustal deformation near the Longmen Shan fault (LMSF). The study reveals a high-viscosity zone beneath the LMSF, where the steady-state viscosity is significantly higher than the transient viscosity. Furthermore, the effective lower crustal viscosity decreases immediately after the earthquake and recovers to interseismic level.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Mei Feng, Hui Qian, James Mechie, Meijian An, Haibing Li, Guangqi Xue, Heping Su, Xiang Cui
Summary: The seismic array along the Longmen Shan fault belt provided densely distributed inter-station cross-correlated surface waves for constructing a new 3-D crustal S-wave velocity model. The model highlights several crustal structure features, including high crustal velocities in certain areas and low velocities in others, as well as low-velocity belts perpendicular to the fault belt. These findings suggest different crustal characteristics and movements along the fault belt, impacting the tectonic activities in the region.
Article
Geography, Physical
Jose Luis Pena-Monne, Pedro Proenca Cunha, Maria Marta Sampietro-Vattuone, David R. Bridgland, Andrew S. Murray, Jan-Pieter Buylaert
Summary: This study focused on the well-exposed terrace deposits of the Guadalaviar and Turia rivers, providing insights into the genetic connection between river-terrace sediments and slope accumulations. New Optically Stimulated Luminescence (OSL) ages were obtained from these Quaternary deposits, revealing the chronological correlation of the glacial-interglacial cycles of the Pyrenees with marine isotope stages. The findings suggest a close relationship between fluvial terraces and slope deposits in a setting influenced by temperate to cold climates.
GLOBAL AND PLANETARY CHANGE
(2022)
Article
Geosciences, Multidisciplinary
Xilin Cao, Xiaofei Hu, Baotian Pan, Zhijun Zhao
Summary: River incision rates in the Qilian Shan were studied to understand the relationship between erosion and past tectonic or climatic processes. The study found that the fast incision rates during the Holocene were due to the decrease in river gradient caused by the warm and wet climate. However, in the interior of the mountains, the upstream incision rate remained stable, suggesting that climate-induced river profile adjustments mainly occur in the downstream reach.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geography, Physical
Lichen Pang, Honghua Lu, Yanwu Lue, Yutong Jiang, Dengyun Wu, Menghan Wu, Xiangmin Zheng, Youli Li
Summary: Studying the fluvial geomorphology of the Kuitun River provides insights into the deformation dynamics of the adjacent active orogenic belt. The analysis of alluvial fans and terraces reveals the evolution of the river and estimates the shortening rates of the Dushanzi anticline.
Article
Meteorology & Atmospheric Sciences
Zhaoyan Gu, Junjie Zhang, Yanwu Lv, Haizhi Wang, Bing Xu, Xiaona Guo
Summary: The study systematically analyzed the Be-10 exposure ages of river terraces in the eastern Tarim Basin, reconstructing hydrological regime changes over the past 170,000 years, and found an inverse relationship between meltwater runoff and temperature changes.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
Article
Geochemistry & Geophysics
Xueyin Yuan, Robert A. Mayanovic, Guoliang Zhang
Summary: By investigating the phase transitions of CaCO3 under high-pressure and high-temperature conditions, it has been confirmed that there are displacive and reconstructive phase transitions, as well as the influence of Ca-substitutional metal cations and aqueous fluids. The presence of Ca-substitutional metal cations in CaCO3 is a key factor controlling the phase stability of CaCO3 under high P-T conditions.
AMERICAN MINERALOGIST
(2021)
Article
Energy & Fuels
Chunhua Wang, Jin Guo, Fuqiang Yang, Guoliang Zhang
Summary: This study experimentally investigated the effects of ignition position and ignition delay on the ignitability and flame behavior of stratified gasoline vapor. It was found that the closer the ignition source was to the oil surface, the earlier the local stratified gasoline vapor became ignitable and lost flammability. A two-zone flame structure was observed, including a blue premixed flame and a following yellow diffusion flame.
Article
Geochemistry & Geophysics
Haiyang Liu, Ying-Yu Xue, Guoliang Zhang, Wei-Dong Sun, Zhen Tian, Brenna Tuller-Ross, Kun Wang
Summary: By analyzing fresh and altered basalts from the IODP Sites U1365 and U1368, it was found that K isotopes undergo significant fractionation during low-temperature alteration of oceanic crust. This altered oceanic crust serves as an important sink for K and contributes to the heavy K isotopic composition of seawater, highlighting the utility of the K isotope system in tracing subducted crustal materials.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geosciences, Multidisciplinary
Mingjun Zhan, Guoliang Zhang
Summary: Studies suggest that high-Mg and K-rich andesitic to rhyolitic arc volcanism in the cold subduction system may be derived from interactions during sediment diapirism. High-pressure experiments show that decarbonation during these interactions can produce melts with elevated MgO, explaining the origin of these volcanic rocks in the typical cold subduction zone.
GEOLOGICAL JOURNAL
(2022)
Article
Geosciences, Multidisciplinary
Yuan Zhong, Guo-Liang Zhang, Wei-Xin Lv, Fang Huang
Summary: The study reveals that the heterogeneous Fe isotopic compositions in the sub-ridge mantle of the South China Sea reflect different mantle source lithologies, including pyroxenite and peridotite. The correlation between the Fe isotopic values and Fe/Mn ratios of the basalts indicate distinct mantle sources, with recycling-related pyroxenitic and depleted subduction-modified peridotitic components.
JOURNAL OF ASIAN EARTH SCIENCES
(2021)
Article
Geochemistry & Geophysics
Junhua Yao, Guoliang Zhang, Shuai Wang, Jianxin Zhao
Summary: Plate subduction potentially enriches carbon in the deep mantle, as evidenced by extreme-Mg olivine with high Fo contents in the stagnant slab beneath Eastern China. The crystallization modeling suggests a genetic relationship between nephelinites and primary carbonated melts, consistent with origin from the paleo-Pacific slab in the mantle transition zone underlying Eastern China.
Article
Geochemistry & Geophysics
Yuan Zhong, Guo-Liang Zhang, Li-Feng Zhong, Li-Hui Chen, Xiao-Jun Wang
Summary: The post-spreading seamount chain in the South China Sea is composed of carbonated silicate melts and alkaline basalts, providing valuable information on the generation of alkaline magma through melting of a carbonated mantle source. Variations in magnesium isotopes and elemental and radiogenic isotope data suggest a recycled origin for the carbon inventory in the source of the lavas, with differences between early- and late-stage samples. The model proposed demonstrates how melting of a carbonated component can produce distinct carbonatitic and silicate melts due to different solidus temperatures along the fossil ridge of the South China Sea.
Article
Geochemistry & Geophysics
Shuai Wang, Guoliang Zhang
Summary: This study examines the rock samples from ODP Site U770 in the Celebes Sea and identifies both normal-type and enriched-type basalts originating from the Indian-type mantle. The results suggest that recycled volcanic oceanic crust and minor pelagic sediments contribute to the origins of Indian-type mantle in the Celebes Sea.
Article
Geochemistry & Geophysics
Junhua Yao, Jian Huang, Guoliang Zhang
Summary: This study investigates alkaline rock samples from the rejuvenated stage of Kaua??i in Hawaii and finds that the heavy Zn isotopic compositions of these samples reflect their mantle source, with the addition of recycled sedimentary carbonates being a key factor for the high ??66Zn and 206Pb/204Pb values.
Article
Geochemistry & Geophysics
Guoliang Zhang, Ji Zhang, Hayden Dalton, David Phillips
Summary: The formation of western Pacific basins and arcs during the Cenozoic is still not fully understood. This study investigates volcanic rocks from the Gagua Ridge and finds that they have arc affinity and are likely derived from melting of subducted sediments. The isotopic compositions of these rocks suggest the presence of Pacific-type mantle in the western Pacific during the Early Cretaceous.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geochemistry & Geophysics
Guoliang Zhang, Shuai Wang, Shichun Huang, Mingjun Zhan, Junhua Yao
Summary: The role of recycled carbonates in Hawaiian volcanism is studied by analyzing the compositions of lavas from different stages. It is found that the rejuvenated stage lavas contain a significant amount of CO2, indicating a CO2-rich mantle source. The temperature of the rejuvenated primary magma is similar to that of the shield stage, suggesting that the carbonated melts responsible for the rejuvenated stage lavas likely originated from the melting of carbonated peridotites in the plume. This study provides important insights into the contribution of recycled carbonates to volcanic activity.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geosciences, Multidisciplinary
Feng Xu, Guoliang Zhang, Wen Yan, Ji Zhang, Junhua Yao
Summary: A study conducted drilling and analysis in the southern South China Sea, providing robust evidence for the existence of a Late Triassic volcanic arc in the East Asia margin. The study also suggests changes in the source and composition of these rocks, possibly related to the steepening subduction of the paleo-Pacific plate.
Article
Geosciences, Multidisciplinary
Yunchao Shu, Guo-Liang Zhang, Lan-Lan Tian, Fang Huang
Summary: Ba isotopes play a crucial role in crustal recycling, with carbonated silicate clasts and alkali basalts from the South China Sea volcanics serving as tracers for recycled oceanic crust components in the mantle. The Ba isotope characteristics indicate a significant incorporation of recycled carbonated oceanic crust in the mantle source, with different isotopic signatures observed in samples from Hainan Island and the South China Sea.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2022)
Article
Geochemistry & Geophysics
Hui-Min Yu, Lin Yang, Guo-Liang Zhang, Fang Huang
Summary: In this study, the effects of seawater alteration on the Si isotopes of altered oceanic crust were investigated. Results showed that fresh and altered basalts from Site U1368 had similar 830Si values within the range of fresh MORB, while samples from Site U1365 exhibited varied 830Si values, suggesting that seawater alteration could affect the Si isotopes of a portion of the oceanic crust.
Article
Environmental Sciences
Wei Chen, Guoliang Zhang, Shantanu Keshav, Yuan Li
Summary: High-pressure experiments show that water significantly depresses the stability of calcium-rich carbonate, promoting the formation of hydrous carbonatitic liquids at depths of 150-180 km and temperatures as low as 850-900 degrees C. This suggests that carbonatite production beneath arcs is more widespread than previously believed and the carbon cycle is likely confined to depths of less than 200 km in many subduction zones.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)