A5004524995- Geomagnetism and Paleomagnetism Studies
- Geology and Paleoclimatology Research
- Geological and Geophysical Studies
- Paleontology and Stratigraphy of Fossils
- Geophysical and Geoelectrical Methods
- Geological formations and processes
- Geological and Geochemical Analysis
- Methane Hydrates and Related Phenomena
- Magnetic and Electromagnetic Effects
- Geochemistry and Elemental Analysis
- Hydrocarbon exploration and reservoir analysis
- Characterization and Applications of Magnetic Nanoparticles
- Iron oxide chemistry and applications
- Genetic diversity and population structure
- Evolution and Paleontology Studies
- Advanced Computational Techniques and Applications
- Vibration Control and Rheological Fluids
- Seismic Imaging and Inversion Techniques
- High-pressure geophysics and materials
- Pleistocene-Era Hominins and Archaeology
- Geochemistry and Geologic Mapping
- Nuclear Physics and Applications
- Magnetic Properties and Applications
- Genomics and Phylogenetic Studies
- Advanced Algorithms and Applications
Peking University
2016-2025
Qingdao National Laboratory for Marine Science and Technology
2018-2025
University of California, San Francisco
2024
Jiangxi University of Science and Technology
2024
San’an Optoelectronics (China)
2024
Xi'an Jiaotong University
2013-2023
Dalian Maritime University
2022
Ministry of Public Security of the People's Republic of China
2022
International Ocean Discovery Program
2019
University of New Caledonia
2019
Greigite (Fe 3 S 4 ) is an authigenic ferrimagnetic mineral that grows as a precursor to pyrite during early diagenetic sedimentary sulfate reduction. It can also grow at any time when dissolved iron and sulfide are available diagenesis. important in paleomagnetic, environmental, biological, biogeochemical, tectonic, industrial processes. Much recent progress has been made understanding its magnetic properties. inverse spinel collinear ferrimagnet with antiferromagnetic coupling between...
First‐order reversal curve (FORC) diagrams have become a standard tool in rock magnetism, yet magnetite is the only magnetic mineral that well characterized using FORC diagrams. We present for predominantly single‐domain (SD) synthetic aluminous hematite ( α ‐Fe 2‐x Al x O 3 ) and goethite ‐(FeAl)OOH) natural greigite (Fe S 4 pyrrhotite 7 8 to constrain interpretation of from samples. Hematite low spontaneous magnetizations negligible interactions, while higher can strong interactions. The...
Magnetic hysteresis measurements of sediments have resulted in widespread reporting “pseudo‐single‐domain”‐like magnetic properties. In contrast, the ideal single domain (SD) properties that would be expected to responsible for high quality paleomagnetic records are rare. Determining whether SD particles rare or common requires application techniques enable discrimination among different components a sediment. We apply range such and find much more than has been reported literature magnetite...
Single-cell resequencing (SCRS) provides many biomedical advances in variations detection at the single-cell level, but it currently relies on whole genome amplification (WGA). Three methods are commonly used for WGA: multiple displacement (MDA), degenerate-oligonucleotide-primed PCR (DOP-PCR) and annealing looping-based cycles (MALBAC). However, a comprehensive comparison of performance between these WGA has not yet been performed.We systematically compared advantages disadvantages...
Nearly one-quarter of all avian species is either threatened or nearly threatened. Of these, 73 are currently being rescued from going extinct in wildlife sanctuaries. One the previously most critically-endangered crested ibis, Nipponia nippon. Once widespread across North-East Asia, by 1981 only seven individuals two breeding pairs remained wild. The recovering ibis populations thus provide an excellent example for conservation genomics since every individual bird has been recruited genomic...
High-purity Fe3S4 (greigite) microcrystals with octahedral shape were synthesized via a simple hydrothermal method using surfactant. The as-prepared samples have the inverse spinel structure high crystallinity. saturation magnetization (Ms) reaches 3.74 μB at 5 K and 3.51 room temperature, which is larger than all reported values thus far. Electrical transport measurements show metallic behavior resistivity 40 times lower in any previous report. potential use of greigite as an anode...
Abstract Understanding marine environmental change and associated biological turnover across the Palaeocene–Eocene Thermal Maximum (PETM; ~56 Ma)—the most pronounced Cenozoic short-term global warming event—is important because of potential role ocean in atmospheric CO 2 drawdown, yet proxies for tracing productivity oxygenation PETM are limited results remain controversial. Here we show that a high-resolution record South Atlantic Ocean bottom water can be extracted from exceptionally...
Abstract Data from International Ocean Discovery Program (IODP) Expedition 371 reveal vertical movements of 1–3 km in northern Zealandia during early Cenozoic subduction initiation the western Pacific Ocean. Lord Howe Rise rose deep (∼1 km) water to sea level and subsided back, with peak uplift at 50 Ma north between 41 32 south. The New Caledonia Trough 2–3 55 45 Ma. We suggest these elevation changes resulted crust delamination mantle flow that led slab formation. propose a “subduction...
Pure ferrimagnetic greigite (Fe 3 S 4 ) has been synthesized by reacting ferric chloride with thiourea and formic acid at 170°C. Sample purity was confirmed X‐ray diffraction, neutron diffraction Mössbauer spectroscopy, coupled magnetic measurements. Scanning electron microscope observations indicate clear cubo‐octahedral polyhedral crystal morphologies. The grain sizes are as large 44 μ m. Detailed low‐ high‐temperature measurements document the previously poorly known properties of...
Abstract Magnetite occurs widely in natural environments both inorganic and biogenic forms. Discrimination of the origin magnetite has important implications, from searching for past microbial activity to interpreting paleomagnetic environmental magnetic records a wide range settings. In this study, we present rock electron microscopic analyses marine sediments continental margin Oman. Low‐temperature data reveal two distinct Verwey transition ( T v ) temperatures that are associated with...
Greigite (Fe3S4) is a widespread authigenic magnetic mineral in anoxic sediments and also commonly biosynthesized by magnetotactic bacteria aqueous environments. While the presence of fossilized bacterial magnetite (Fe3O4) has now been widely demonstrated, preservation greigite magnetofossils geological record only poorly constrained. Here we investigate Mio-Pliocene former Black Sea to test whether can detect unravel potential environmental controls on formation. Our analyses transmission...
Abstract Magnetic mineral inclusions occur commonly within other larger phases in igneous rocks and have been demonstrated to preserve important paleomagnetic signals. While the usefulness of magnetic has explored extensively, their presence sediments only speculated upon. The contribution magnetization sediments, therefore, elusive. In this study, we use transmission electron microscope (TEM) methods demonstrate widespread preservation silicate‐hosted marine sedimentary settings. TEM...
Abstract The central ridge structure of a first‐order reversal curve (FORC) distribution is indicative uniaxial noninteracting single domain magnetic particles, which provides the opportunity to identify and characterize biogenic mineral remains (magnetofossils) in sediments. Recent studies have shown that magnetofossils are widespread geological record they carry useful environmental information contribute paleomagnetic recording, makes it essential quantify how these components properties...
Abstract Pelagic marine carbonates provide important records of past environmental change. We carried out detailed low‐temperature magnetic measurements on biogenic magnetite‐bearing sediments from the Southern Ocean (Ocean Drilling Program (ODP) Holes 738B, 738C, 689D, and 690C) samples containing whole magnetotactic bacteria cells. document a range properties, including reversible humped cycling (LTC) curves. Different degrees magnetite oxidation are considered to be responsible for...
Reconstructions of ocean oxygenation are critical for understanding the role respired carbon storage in regulating atmospheric CO2. Independent sediment redox proxies essential to assess such reconstructions. Here, we present a long magnetofossil record from eastern Indian Ocean which observe coeval magnetic hardening and enrichment larger, more elongated, less oxidized magnetofossils during glacials compared interglacials over last ~900 ka. Our multi-proxy records redox-sensitive...
Abstract First‐order reversal curve (FORC) diagrams are a standard rock magnetic tool for analyzing bulk hysteresis behaviors, which used to estimate the mineralogies and domain states of grains within natural materials. However, interpretation FORC distributions is challenging due complex domain‐state responses, introduce well‐documented uncertainties subjectivity. Here, we propose neural network algorithm (FORCINN) invert size aspect ratio distribution from measured data. We trained tested...
Abstract The Bengal Fan is the largest submarine fan on Earth with a complex channel system. Therefore, it challenging to understand evolution of sediment source‐to‐sink processes. Here we present synthesis high‐resolution environmental magnetic records five cores from central and lower reconstruct sedimentation history for past 45 ka. Rock measurements electron microscopic analyses reveal that detrital (titano)magnetites are dominant minerals in sediments, while deposits exhibit enhanced...
Abstract The Holocene Warm Period (HWP) provides valuable insights into the climate system and biotic responses to environmental variability thus serves as an excellent analogue for future global changes. Here we document, first time, that warm wet HWP conditions were highly favourable magnetofossil proliferation in semi-arid Asian interior. pronounced increase of concentrations at ~9.8 ka decrease ~5.9 Dali Lake coincided respectively with onset termination are linked increased nutrient...