Article
Geosciences, Multidisciplinary
Jose M. Plata, Rafael Rodriguez, Frank Preusser, Jaume Boixadera, J. Carles Balasch, Montserrat Antunez, Rosa M. Poch
Summary: The study focused on the pedogenesis of two red soils in the southeast of the Ebro Valley, revealing that one soil formed around 140 ka ago, while the other soil formed between 100 and 130 ka ago and underwent a new cycle of pedogenesis around 30 ka ago. The results suggest that biological activity may play a significant role in the reddening process of similar Mediterranean soils.
Article
Geosciences, Multidisciplinary
Yanbo Zhu, Shuaisheng Miao, Hongfei Li, Yutao Han, Hengxing Lan
Summary: This study investigates the failure mode and shear strength characteristics of the loess-Hipparion red clay contact interface through shear experiments. The results show that discontinuities between the loess and the Hipparion red clay significantly reduce the shear strength of specimens. The interface morphology and the applied normal stress play a crucial role in the shear performance of the contact interface.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Rui Zhang, Xiaojuan Li, Yong Xu, Jianxing Li, Lu Sun, Leping Yue, Feng Pan, Feng Xian, Xiaohao Wei, Yuge Cao
Summary: This study conducted magnetostratigraphy and cyclostratigraphy on an eolian red clay sequence in the eastern Chinese Loess Plateau, and found that the unconventional 173-kyr obliquity modulated cycle is significant for reconstructing terrestrial air circulation and shows distinct characteristics in the cyclic sedimentary patterns of East Asia monsoon deposits.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Engineering, Environmental
Ruifeng Chen, Guojun Cai, Surya Sarat Chandra Congress, Xiaoqiang Dong, Wei Duan
Summary: This study found that using red mud waste as a partial replacement of cement can improve the dynamic properties of loess, enhancing both stability and reducing environmental impact.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Geosciences, Multidisciplinary
Benhong Guo, Junsheng Nie, Jianxing Li, Wenjiao Xiao, Feng Pan
Summary: This study presents a reconstruction of the expansion/shrinkage history of the Paratethys Sea based on the analysis of Eocene eolian Red Clay deposits in the northeastern Tibetan Plateau. The results reveal that the Paratethys Sea experienced a three-stage evolution between approximately 51 and 40 million years ago, with four rapid shrinkages occurring during the expansion phase.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geography, Physical
D. Jordanova, Q. Simon, S. Balescu, N. Jordanova, D. Ishlyamski, B. Georgieva, D. L. Bourles, A. Duvivier, S. Cornu
Summary: This study presents a high-resolution investigation of a 450 ka old loess-paleosol profile, combining mineral magnetic and rock magnetic data with pedological parameters. The results demonstrate the complex response of the sediments to changes in source material and climate. The findings highlight the significance of using principal component analysis to understand the underlying sedimentary and environmental processes.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Zhixiang Wang, Tianfu Zhang, Alexis Licht, Mengmeng Cao, Rui Zhang
Summary: Deciphering the frequency of dust outbreaks in inland Asia during the late Cenozoic is crucial for predicting future hydroclimate in arid regions of China. This study presents a sedimentary sequence from the southern Junggar Basin in Northwestern China, dating back to the past 3.5 million years. The findings suggest that the Westerly derived moisture supply and dust input into inland Asia have different responses to orbital forcing since 3.5 million years ago. This highlights the importance of considering different drivers for moisture supply and dust transport in understanding hydroclimate changes.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Engineering, Environmental
Jianqi Zhuang, Jianbing Peng, Yi Zhu
Summary: The particle size and clay content variation of loess in the Loess Plateau result in different physical characteristics and failure processes. Increasing clay content changes the failure process of loess from regressive overall failure to erosion failure.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Multidisciplinary Sciences
Zhang Ming, Hu Dongke, Pan Shaoyu, Chen Guozhou
Summary: Permeability tests using a flexible wall permeameter were conducted to investigate the impact of bentonite-HDTMA on the permeability of Loess, a potential lining material for solid waste landfills. The results revealed that compacted Loess from the middle and lower reaches of the Yellow River in China did not meet the required impermeability standards for landfill liners. However, the permeability of Loess mixed with more than 10% bentonite ratio was significantly lower than the acceptable limit. The addition of a small amount of HDTMA slightly increased the permeability of Loess, but a certain ratio of bentonite-HDTMA still ensured impermeability.
SCIENTIFIC REPORTS
(2023)
Article
Geosciences, Multidisciplinary
Zhi Liu, Xuelian Guo, Xiuming Liu, Slobodan B. Markovic
Summary: A systematic comparison of the magnetic properties of loess in northern China and northern Serbia was conducted, revealing differences in the contents and domain states of magnetic minerals between the two regions. Factors such as source distances of aeolian dust, pedogenesis, and climatic conditions contribute to the variations in magnetic properties and magnetic mineral contents.
Article
Multidisciplinary Sciences
Qingwei Zhang, Chunguang Zhang
Summary: In this study, a large precast pile-soil shear experimental device is used to investigate the characteristics of the concrete-loess interface under different freezing temperatures and moisture contents. The shear strength parameters and the shear mechanism of the interface are analyzed. A stress-strain constitutive equation and a shear strength criterion considering temperature and moisture content are proposed. The experimental results demonstrate the three stages of shear failure mechanism and the influence of temperature, moisture content, and normal stress on the interface shear strength.
Article
Engineering, Geological
Ya-ni Wei, Wen Fan, Chengbo Fu, Bo Yu
Summary: This study investigated the type, content, properties, and occurrence mode of clay minerals in Malan loess. The results indicated that interstratified illite-montmorillonite and illite are two primary clay minerals in the studied loess. The hydration swelling of clay cementation was illustrated to be the primary trigger of loess collapse
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2023)
Article
Geography, Physical
Qing Pan, Guoqiao Xiao, Qingyu Zhao, Ruisheng Chen, Hong Ao, Yanfei Shen, Junyao Cheng, Zongmin Zhu
Summary: This study investigates the discrepancies in the positions of the upper and lower boundaries of the Jaramillo subchron in Chinese loess among different sections. The results suggest that these discrepancies may be due to unstable primary remanent magnetization acquired by loess deposits during intervals of geomagnetic reversals or excursions with low-intensity geomagnetic field, leading to overprinting by subsequent high-intensity fields. This hypothesis may explain the observed downward shifts and anomalies in polarity zones in the loess sections.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Environmental Sciences
Changyu Liang, Hui Zhang, Tao Wang
Summary: This paper examines the distribution of red clay/mudstone and active faults on the Loess Plateau in China, and their relationship with the distribution of landslides and their scales. The results reveal the impact of neotectonic activity and the distribution of red clay/mudstone on landslide types and scales.
ENVIRONMENTAL EARTH SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Guoyong Zhao, Jia'ning Meng, Yan Han, Xiuming Liu, Bin Lu, Minghua Liu, Qiang Qiao, Hetan Li, Yun Wang
Summary: In this study, the researchers investigated the controlling factors and paleoclimatic significance of color reflectance in Late Tertiary red clay. They found that the concentration of iron oxides and the intensity of pedogenesis were positively correlated with the redness and yellowness of the clay. They also discovered that various color reflectance parameters could be used as indicators of haematite concentration, goethite concentration, and temperature.
GEOLOGICAL JOURNAL
(2023)
Review
Geosciences, Multidisciplinary
Andrew P. Roberts, Xiang Zhao, David Heslop, Alexandra Abrajevitch, Yen-Hua Chen, Pengxiang Hu, Zhaoxia Jiang, Qingsong Liu, Brad J. Pillans
GEOSCIENCE LETTERS
(2020)
Article
Geochemistry & Geophysics
D. Heslop, A. P. Roberts, H. Oda, X. Zhao, R. J. Harrison, A. R. Muxworthy, P. -X. Hu, T. Sato
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Article
Geochemistry & Geophysics
Liao Chang, Hoabin Hong, Fan Bai, Shishun Wang, Zhaowen Pei, Greig A. Paterson, David Heslop, Andrew P. Roberts, Baochun Huang, Lisa Tauxe, Adrian R. Muxworthy
Summary: The quasi-linear field-dependence of remanence is crucial for sedimentary relative palaeointensity studies. Magnetic-mineral inclusions within sediments play a significant role in the remanent magnetization and can affect the recording efficiency and inclination shallowing. The size of silicate particles in sediments can impact the inclination shallowing and magnetic moment behavior in Earth-like magnetic fields.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Pengxiang Hu, Hirokuni Oda, Xiang Zhao, Richard J. Harrison, David Heslop, Tetsuro Sato, Adrian R. Muxworthy, Andrew P. Roberts
Summary: This study focuses on the separation and identification of magnetic components in complex magnetite and hematite mixtures. Different methods, such as FORC, PCA, IRM curve decomposition, were used to extract specific information effectively. It is recommended to combine PCA analysis with FORC analysis to identify magnetic components in complex mixtures.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geography, Physical
Kelsie Long, David Heslop, Eelco J. Rohling
Summary: The Willandra Lakes region in southeastern Australia is a UNESCO World Heritage Site of cultural, archaeological, and geological significance, preserving records of Aboriginal occupation and environmental change. The linkage between archaeology and palaeoenvironmental information is complicated by the different time scales represented in the data.
QUATERNARY RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Yi Wu, Andrew P. Roberts, Katharine M. Grant, David Heslop, Brad J. Pillans, Xiang Zhao, Eelco J. Rohling, Thomas A. Ronge, Mingming Ma, Paul P. Hesse, Alan S. Palmer
Summary: The study of marine sediment core PS75/100-4 from the east of South Island, New Zealand, reveals that the main source of eolian dust in the region for the past 410 kyr is New Zealand rather than Australia. This suggests that New Zealand should be considered an important long-term regional dust source in global dust cycle models.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2021)
Article
Environmental Sciences
Juan C. Larrasoana, Jorge Pey, Xiang Zhao, David Heslop, Tania Mochales, Pilar Mata, Elisabet Beamud, Jesus Reyes, Jose C. Cerro, Noemi Perez, Sonia Castillo
Summary: This study conducted an environmental magnetic examination of atmospheric deposition in Spain using a multi-method approach, revealing the presence of important magnetic mineral assemblages of both anthropogenic and natural origins across different types of environments.
ATMOSPHERIC ENVIRONMENT
(2021)
Article
Geochemistry & Geophysics
Yao Qian, David Heslop, Andrew P. Roberts, Pengxiang Hu, Xiang Zhao, Yan Liu, Jinhua Li, Katharine M. Grant, Eelco J. Rohling
Summary: Periodic redox changes in eastern Mediterranean marine sediments drive environmental and diagenetic changes to which magnetic minerals are sensitive, providing useful indications of paleoceanographic conditions. Low-temperature magnetic properties, along with room temperature properties, show the presence of magnetite magnetofossils and superparamagnetic particles in sediments, with magnetite particles partially oxidized in oxidation fronts, highlighting the value of LT magnetic measurements in quantifying diverse sedimentary magnetic signals.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Multidisciplinary Sciences
Eelco J. Rohling, Jimin Yu, David Heslop, Gavin L. Foster, Bradley Opdyke, Andrew P. Roberts
Summary: Sea level and deep-sea temperature variations are crucial indicators of global climate changes. Recent studies have shown distinct nonlinearity between sea level and delta(w) changes over the past 40 million years, indicating complex dynamical behavior in Earth's climate system.
Article
Geosciences, Multidisciplinary
Ann Holbourn, Wolfgang Kuhnt, Steven C. Clemens, David Heslop
Summary: The study reveals the dynamic evolution of the East Asian Monsoon during the middle to late Miocene, influenced by variations in local insolation forcing and Southern Hemisphere ice volume. Climate warming led to increased seasonality of the monsoon, while monsoon weakening was associated with carbonate depletion.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2021)
Article
Statistics & Probability
Janice L. Scealy, David Heslop, Jia Liu, Andrew T. A. Wood
Summary: This article explores statistical analysis methods for clustered data on spheres and proposes a new hierarchical parametric model that avoids unrealistic assumptions. The study uses data collected from the Golan Heights volcanic plateau as a case study and suggests bootstrap confidence regions for the overall mean direction based on clustered data, which will be useful to geophysics practitioners.
INTERNATIONAL STATISTICAL REVIEW
(2022)
Correction
Multidisciplinary Sciences
Nerilie J. Abram, Nicky M. Wright, Bethany Ellis, Bronwyn C. Dixon, Jennifer B. Wurtzel, Matthew H. England, Caroline C. Ummenhofer, Belle Philibosian, Sri Yudawati Cahyarini, Tsai-Luen Yu, Chuan-Chou Shen, Hai Cheng, R. Lawrence Edwards, David Heslop
Article
Geochemistry & Geophysics
Andrew P. Roberts, Xiang Zhao, Pengxiang Hu, Alexandra Abrajevitch, Yen-Hua Chen, Richard J. Harrison, David Heslop, Zhaoxia Jiang, Jinhua Li, Qingsong Liu, Adrian R. Muxworthy, Hirokuni Oda, Hugh St C. O'Neill, Brad J. Pillans, Tetsuro Sato
Summary: Hematite carries important magnetic signals for various studies, and analyzing FORC diagrams can provide insights into the domain state and magnetostatic interactions of magnetic particles. The features observed in hematite samples, such as ridge-type and kidney-shaped FORC signatures, are influenced by the triaxial basal plane anisotropy of the mineral. The balance between uniaxial and triaxial switching determines the dominant FORC distribution type in a sample, explaining the intrinsic magnetization switching and anisotropy features of hematite.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Correction
Environmental Sciences
Katharine M. Grant, Udara Amarathunga, Jessica D. Amies, Pengxiang Hu, Yao Qian, Tiah Penny, Laura Rodriguez-Sanz, Xiang Zhao, David Heslop, Diederik Liebrand, Rick Hennekam, Thomas Westerhold, Stewart Gilmore, Lucas J. Lourens, Andrew P. Roberts, Eelco J. Rohling
COMMUNICATIONS EARTH & ENVIRONMENT
(2022)
Article
Environmental Sciences
Katharine M. Grant, Udara Amarathunga, Jessica D. Amies, Pengxiang Hu, Yao Qian, Tiah Penny, Laura Rodriguez-Sanz, Xiang Zhao, David Heslop, Diederik Liebrand, Rick Hennekam, Thomas Westerhold, Stewart Gilmore, Lucas J. Lourens, Andrew P. Roberts, Eelco J. Rohling
Summary: Dark organic-rich layers have accumulated in Mediterranean sediments since the Miocene. Through studying high-resolution geochemical and environmental magnetic records, it is found that organic burial intensified 3.2 million years ago, possibly due to a sudden nonlinear change in the environment of North Africa. This finding is of great significance for understanding environmental evolution.
COMMUNICATIONS EARTH & ENVIRONMENT
(2022)