Article
Crystallography
Ying Ma, Zhili Qiu, Xiaoqin Deng, Ting Ding, Huihuang Li, Taijin Lu, Zhonghua Song, Wenfang Zhu, Jinlin Wu
Summary: The Chinese HPHT diamonds and natural IIa diamonds were analyzed in this study to differentiate between them. The study found that the HPHT samples had unique inclusions and complex Raman spectra, while the natural IIa diamonds had different growth environments reflected by PL peaks. The chemical components of the diamonds were also used as a distinguishing factor.
Article
Materials Science, Multidisciplinary
A. V. Inyushkin, A. N. Taldenkov, A. P. Yelisseyev, V. G. Vins
Summary: The effects of irradiation and high-temperature annealing on the thermal conductivity of synthetic HPHT diamond with impurity nitrogen were studied. The study analyzed the optical absorption, photoluminescence spectra, magnetization, and thermal conductivity of two plates from the same diamond single crystal. It was observed that irradiation significantly suppressed the thermal conductivity at low temperatures, while annealing restored it at moderate and high temperatures but not at low temperatures.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Shuai Fang, Yongkui Wang, Liangchao Chen, Zhiyun Lu, Zhenghao Cai, Chao Fang, Zhandong Zhao, Hongan Ma, Xiaopeng Jia
Summary: The study found that increasing pressure in a high-pressure nitrogen-doped system can decrease the nitrogen content inside the diamond. Increasing pressure can result in a higher proportion of A-center nitrogen in nitrogen-doped diamond, which is important for exploring the formation of natural type Ia diamonds.
Article
Materials Science, Multidisciplinary
Yuan Nie, ShangSheng Li, Qiang Hu, JunZhuo Wang, MeiHua Hu, TaiChao Su, GuoFeng Huang, ZhanChang Li, Yong Li, HongYu Xiao
Summary: The influence of nitrogen impurities on diamond is an important issue, and annealing is a crucial method to modify the state of nitrogen in diamond. This study synthesized C3H6N6 doped diamonds with high nitrogen content and annealed them at high pressure and high temperature (HPHT). The results showed that HPHT annealing improved the transparency of high nitrogen diamond and eliminated or destroyed the pyramid defects on its surface. Furthermore, annealing changed the state of aggregation of nitrogen from C center to A center in high nitrogen diamonds.
Review
Biochemical Research Methods
Aleksandra N. Koreshkova, Vipul Gupta, Anton Peristyy, Chowdhury K. Hasan, Pavel N. Nesterenko, Brett Paull
Summary: Diamond-based adsorbents have gained increasing interest in solid-phase extraction and high-performance liquid chromatography due to their unique properties such as extreme stability, high mechanical strength, and complex retention mechanisms. Different types of diamonds, including detonation nanodiamonds, high-pressure high-temperature diamonds, and chemical vapour deposition diamonds, have been used for various applications in proteome analysis, extraction of metals, and development of different types of liquid chromatography columns. The specific surface and bulk properties of these diamonds play a key role in determining their suitability for different applications in SPE and HPLC.
JOURNAL OF CHROMATOGRAPHY A
(2021)
Article
Chemistry, Physical
V. N. Kazuchits, N. M. Kazuchits, M. S. Rusetskiy, O. Korolik, A. Konovalova, O. Ignatenko
Summary: The paper investigates the effects of RHPHT annealing on synthetic Ib-type diamond plates at high temperatures and pressures. The process resulted in inhomogeneous plastic deformation of diamond plates, generating vacancies and nitrogen defects. Higher temperatures during RHPHT annealing led to the formation of more complex nitrogen aggregates. The number of defects was significantly greater after RHPHT annealing compared to quasi-stationary HPHT annealing.
Article
Materials Science, Multidisciplinary
Zhiwen Wang, Yang Liu, Hongyu Zhao, Bowei Li, Qianyu Guo, Hongan Ma, Xiaopeng Jia
Summary: Boron-doped diamond single crystals were synthesized using the temperature gradient method and characterized in terms of morphology, crystal quality and performance. The addition of boron changed the color and surface morphology of the diamond crystals, and reduced the crystal quality.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Crystallography
Kaiyue Sun, Taijin Lu, Mingyue He, Zhonghua Song, Jian Zhang, Jie Ke
Summary: In this study, the presence of titanium as a nitrogen getter in HPHT synthetic diamond crystals was investigated using SEM-EDS and micro-XRF. Two forms of titanium were found at the end of crystal growth: titanium reacted with carbon to form TiC, which was deposited on the surface of diamond crystals in a dendritic pattern, and titanium entered the diamond crystals to form metallic inclusions. This study provides reliable data for a comprehensive analysis of the effect of titanium as a nitrogen getter in the growth process of HPHT synthetic diamond crystals and will positively contribute to the development of synthetic diamond technology.
JOURNAL OF CRYSTAL GROWTH
(2023)
Article
Chemistry, Multidisciplinary
Zhenghao Cai, Ming Li, Liangchao Chen, Shuai Fang, Zhiwen Wang, Hongyu Zhao, Hongan Ma, Xiaopeng Jia
Summary: This study successfully synthesized diamonds with nitrogen, hydrogen, and oxygen elements using iron and nickel catalysts. The effects of nitrogen, hydrogen, and oxygen on the catalysts were thoroughly researched. The results provide valuable data for synthesizing diamonds with rich nitrogen, hydrogen, and oxygen content.
Article
Materials Science, Multidisciplinary
A. A. Razgulov, S. G. Lyapin, A. P. Novikov, E. A. Ekimov
Summary: This study reports on the temperature shift and broadening of the zero phonon line (ZPL) of SnV center in HPHT microcrystalline diamond in the temperature range of 80-300 K. By studying the pressure effect on the ZPL, contributions of lattice thermal expansion and electron-phonon coupling were separated. A strong nonlinearity observed in the electron-phonon part of the ZPL temperature shift appeared to be related to the effect of the strong softening of elastic springs, showing good agreement with a polynomial law increment.
DIAMOND AND RELATED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Shaoyu Wang, Zhihong Li, Yumei Zhu, Peisen Huang, Wenjie Wang, Xiangfa Zhang, Xing Wei
Summary: Cubic boron nitride (cBN) matrix composites with submicron diamond exhibit improved mechanical properties. The introduction of a small amount of diamond enhances the density and hardness of the composites. At a diamond content of 4 wt%, the composite achieves the highest values of flexural strength, relative density, and fracture toughness.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Geochemistry & Geophysics
Zhiyun Lu, Hongyu Zhao, Yongkui Wang, Shuai Fang, Zhenghao Cai, Zhiwen Wang, Hong-an Ma, Liangchao Chen, Hongsheng Jia, Xiaopeng Jia
Summary: This paper reports the detailed phase composition and characteristics of diamond crystals grown in the metal-silicate-H2O-C system, showing lower conversion efficiency of graphite-to-diamond in comparison to the metal-C system. The increase in Mg2Si3O8.5H(2)O content results in changes in crystal growth features and inclusions. The appearance of C-H, C-O, and C=O bonds signify the potential decomposition of H2O and bonding with carbon atoms to enter the diamond structure.
Article
Materials Science, Multidisciplinary
Randall M. German
Summary: High performance sintered diamond tools are an important advancement in hard materials technology, creating a dense diamond-metal composite through liquid phase sintering. In this process, a cobalt-rich liquid infiltrates between diamond grains at temperatures around 1400 degrees C, resulting in a compact bond. By applying high pressure and temperature, small diamond particles can achieve full density in a short amount of time. The sintering mechanism involves carbon transport through dissolution of graphite and precipitation of diamond under high pressure. Surface defects play a role in the nucleation of sinter bonds.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Geochemistry & Geophysics
Hongda Hao, Ian H. Campbell, Richard J. Arculus, Michael R. Perfit
Summary: The study reveals that most primitive mid-ocean ridge basalts have low platinum-group element content, which may be due to changes in sulfur saturation during ascent from the mantle to the ridge magma chamber. Sulfide saturation status can be determined by changes in Pd content, and frequent small replenishments in the magma chamber help maintain sulfide saturation status.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Jianbo Tu, Xueqi Wang, Wenhao Dai, Haibo Zhang, Baochang Liu
Summary: This study successfully synthesized dense PDC samples doped with SiC whiskers under high pressure and high temperature conditions. The introduction of SiC whiskers improved the mechanical properties of PDC, including hardness, wear resistance, impact toughness, and thermal stability.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Geochemistry & Geophysics
Anton Shatskiy, Ivan V. Podborodnikov, Anton V. Arefiev, Altyna Bekhtenova, Yulia G. Vinogradova, Konstantin M. Stepanov, Konstantin D. Litasov
Summary: The study found that the reactions between pyroxenes and carbonates vary under different pressure and temperature conditions, with the solidus loci primarily influenced by temperature and pressure.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2021)
Article
Chemistry, Multidisciplinary
Pavel N. Gavryushkin, Dinara N. Sagatova, Nursultan Sagatov, Konstantin D. Litasov
Summary: Orthocarbonates of alkaline earth metals are a newly discovered class of compounds stabilized at high pressures. Mg2CO4, a potential carbon host phase, can be formed in the lower mantle at pressures above 50 GPa and high temperatures. It has two stable crystal structures, with higher melting temperatures and stronger anisotropy compared to magnesite, and its Raman spectra can aid in its identification in high-pressure experiments.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Geochemistry & Geophysics
D. N. Sagatova, A. F. Shatskiy, N. E. Sagatov, K. D. Litasov
Summary: Phase relations of CaSiO3 in different pressure and temperature conditions were comprehensively studied using density functional theory and lattice dynamics method. The stability of CaSiO3 in various structures under different conditions was revealed, along with the variations in phase equilibrium curve slopes.
GEOCHEMISTRY INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Y. G. Vinogradova, A. F. Shatskiy, K. D. Litasov
Summary: The research findings suggest the existence of molecular CO2 inclusions in diamonds, and thermodynamic calculations indicate that the formation of solid solutions expands the stability field of CO2 fluid with mantle minerals. Preliminary experiments with model mixtures validate these relationships at high pressures and temperatures.
GEOCHEMISTRY INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Anna Barbaro, Maria Chiara Domeneghetti, Konstantin D. Litasov, Ludovic Ferriere, Lidia Pittarello, Oliver Christ, Sofia Lorenzon, Matteo Alvaro, Fabrizio Nestola
Summary: The investigation of a fragment of Kenna ureilite revealed the presence of microdiamonds, nanographite, and magnetite in the carbon-bearing areas, indicating a shock event with peak pressure at least 15 GPa. Additionally, nanocrystalline carletonmooreite with formula Ni3Si was identified for the first time in a ureilite, supporting the hypothesis of Fe-Ni Alloys catalytic involvement in the growth process of diamond from graphite during shock events in the ureilite parent body.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geosciences, Multidisciplinary
Anton Shatskiy, Altyna Bekhtenova, Anton Arefiev, Ivan Podborodnikov, Yulia G. Vinogradova, Dmitriy Rezvukhin, Konstantin D. Litasov
Summary: The study found that the infiltration of water-rich carbonate melts into the mantle rocks can lead to the consumption of minerals like garnet and orthopyroxene, producing new minerals like phlogopite and K-richterite. This metasomatic process may weaken the lithosphere and promote the formation of continental rifts.
Article
Chemistry, Inorganic & Nuclear
Tatyana B. Bekker, Ivan Podborodnikov, Nursultan E. Sagatov, Anton Shatskiy, Sergey Rashchenko, Dinara N. Sagatova, Alexey Davydov, Konstantin D. Litasov
Summary: The alpha- and beta-modifications of barium metaborate are important functional materials used in optoelectronic devices. A new high-pressure modification, gamma-BaB2O4, has been successfully synthesized and studied for its unique structure and excellent optical properties.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Tatyana B. Bekker, Alexey A. Ryadun, Alexey V. Davydov, Vladimir P. Solntsev, Veronika D. Grigorieva
Summary: Single crystals of undoped and rare-earth-doped Ba-12(BO3)(6)[BO3][LiF4] were grown from high-temperature solutions. The luminescence of these crystals at specific excitation wavelengths shows potential for converting LED emissions into white light.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Talgat M. Inerbaev, Yulun Han, Tatyana B. Bekker, Dmitri S. Kilin
Summary: Mechanisms of photoluminescence in antizeolitefluoride borates (AFBs) doped by copper ions are interpreted based on a comparison between experimental and computational approaches. Doped AFBs demonstrate the effect of thermally stimulated photoluminescence and hold a promise for the use as radiation detectors. The electronic and optical properties of Cu-containing fluoride borates with different anionic groups are modeled, and the results show the significant influence of the oxidation state of copper ions on the properties. Theoretical calculations of photoluminescence spectra contribute to the interpretation of experimental data and provide insights for designing materials with desired properties for radiation detectors.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Physics, Multidisciplinary
Ivan Podborodnikov, Anton Shatskiy, Anton Arefiev, Altyna Bekhtenova, Konstantin D. Litasov
Summary: Continuous variations in the composition of melt inclusions in diamonds suggest their possible genetic relationship and provide interest in the study of chloride-carbonate systems at high pressure. Experimental data show that the KCl-CaCO3 and KCl-MgCO3 systems have eutectic characteristics.
HIGH PRESSURE RESEARCH
(2022)
Article
Multidisciplinary Sciences
Nursultan E. Sagatov, Dinara N. Sagatova, Pavel N. Gavryushkin, Konstantin D. Litasov
Summary: Based on density functional theory and crystal structure prediction, we discovered a novel high-pressure structure of Fe2CO4-P(1) over bar. It contains ethane-like O3C-CO3 groups or orthooxalate groups, which were previously proposed in melts and aqueous carbonate solutions but not in inorganic crystalline materials. This structure is dynamically and thermally stable at pressures of 50 GPa and similar structures were also predicted for Mn2CO4, Ni2CO4, and Co2CO4. FeCO3 was found to transform into a similar structure at pressures above 275 GPa. Additionally, we observed the self-diffusion of metal atoms in carbonates at high pressure and high temperatures for the first time. The prediction of novel carbonate structures expands the crystal chemistry of inorganic carbonates beyond the known structures with [CO3] triangles, [C2O5] pyro-groups, and [CO4] tetrahedra.
Article
Chemistry, Applied
Yoshihiro Kon, Takuya Nakashima, Yoshiki Makino, Hiroki Nagashima, Shun-ya Onozawa, Shu Kobayashi, Kazuhiko Sato
Summary: Continuous-flow epoxidation of aliphatic and aromatic alkenes using a fixed-bed liquid flow reactor equipped with a solid titanium silicalite-1 (TS-1) catalyst column and hydrogen peroxide (H2O2) as the oxidant was achieved. The developed flow reaction allowed for the continuous synthesis of 4-phenyl-1,2-epoxybutane with high yields (90%-98%) for 150 hours. By using a mixed solution of MeCN and MeOH, the reaction enabled the epoxidation of less-reactive long-chain terminal alkenes and multifunctional alkenes with good selectivity (78%-99%) and yields (12%-98%).
ADVANCED SYNTHESIS & CATALYSIS
(2023)
Article
Geochemistry & Geophysics
Anton Shatskiy, Ivan V. Podborodnikov, Anastasia S. Fedoraeva, Anton Arefiev, Altyna Bekhtenova, Konstantin D. Litasov
Summary: The phase relations in the NaCl-CaCO3 and NaCl-MgCO3 systems were experimentally studied using a multi-anvil press at 6 GPa and temperatures ranging from 1000 to 1600 degrees C. Both systems were found to have eutectic type phase diagrams, with subsolidus assemblages of halite + aragonite and halite + magnesite. The composition of the halite-aragonite eutectic was determined to be 40 wt% NaCl and 60 wt% CaCO3 at temperatures below 1200 degrees C, while the halite-magnesite eutectic had a composition of 72 wt% NaCl and 28 wt% MgCO3 at 1300 degrees C. Complete miscibility between carbonate and chloride liquids was observed up to 1600 degrees C.
AMERICAN MINERALOGIST
(2023)
Article
Geochemistry & Geophysics
Anton V. V. Arefiev, Anton Shatskiy, Altyna Bekhtenova, Konstantin D. D. Litasov
Summary: Liquid immiscibility is significant in the formation of carbonatites and alkaline Si-undersaturated magmas. The miscibility gap between carbonate and silicate is determined by pressure and differs between sodium carbonate-aluminosilicate and potassium-rich carbonate-aluminosilicate systems. This study investigates the immiscibility range under intermediate pressures and finds that the compositions of immiscible phonolite and carbonatite melts change with pressure, indicating different depth and mantle conditions.
Article
Chemistry, Analytical
Yoshiki Makino, Hiroki Matsuo, Koichiro Masuda, Shun-ya Onozawa, Tetsuya Nakazato
Summary: The evaluation of metal leaching in metal-catalyzed reactions is crucial, but current analytical methods for trace metal determination in organic reaction solutions are time-consuming and require high purity reagents. In this study, a rapid and sensitive method using LA-ICP-MS was developed for the determination of platinum group elements (PGEs) in organic reaction solutions. The proposed method allows for quick detection without the need for pre-treatment and can be completed in a short amount of time. The accuracy and adaptability of this method were confirmed through comparison with conventional methods.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2022)
Article
Geosciences, Multidisciplinary
Bin Zhang, Jiaqi Liu, Wen Chen, Zhiliang Zhang, Li Yang, Lei Zhang, Zeyang Zhu, Chunqing Sun, Zhihao Sun
Summary: The eastern Tibetan Plateau is a region with unique topography and active tectonics, making it crucial for studying geodynamics and lithosphere-atmosphere interaction. By integrating new and reported thermochronological data, as well as paleo-crustal thickness reconstruction, this study sheds light on the tectonic deformation, climate-tectonic coupling, and geodynamics of the area.
Article
Geosciences, Multidisciplinary
Zhenhua Tian, Shangwen Zhou, Songtao Wu, Sai Xu, Junping Zhou, Jianchao Cai
Summary: This paper presents a modified method for calculating the lost gas content of shale by analyzing the coring and on-site desorption processes. The method accurately depicts the loss characteristics of free and adsorbed gas and identifies parameters that influence the calculation of in-situ shale gas content. The results demonstrate that the method shows satisfactory applicability in gas loss curve prediction and in-situ gas content estimation.
Article
Geosciences, Multidisciplinary
Pengcheng Li, Jaffar Abbas, Daniel Balsalobre-Lorente, Qingren Wang, Qianxiao Zhang, Syed Ale Raza Shah
Summary: This study explores the factors contributing to sustainability in Pakistan from 1974 to 2018 and finds that emissions from industrial and agriculture sectors have significantly decreased, while the financial sector has not effectively reduced environmental pressure. Therefore, Pakistan needs to adjust its economic policies and ensure the green allocation of financial resources.
Article
Geosciences, Multidisciplinary
Shi Zhou, Ting Zhou, Duo Guan, Yong Yao, Huimin Sun, Ahmed Ali Mosa, Yajie Zuo, Xianqiang Yin
Summary: Graphitic carbon nitride (g-C3N4) has been widely used due to its excellent optical properties and physicochemical stability. The risk of g-C3N4 transport in the environment has been overlooked, but this study investigated its transport behavior in various media. The results showed that flow rate and ionic strength influenced the transport, and the presence of lead (Pb) affected the outflow of g-C3N4. The unique structure of g-C3N4 particles allowed them to deposit in certain media and act as carriers for Pb release.
Article
Geosciences, Multidisciplinary
Xiaolong Qiao, Muntasir Murshed, Mohammad Mahtab Alam, Narasingha Das, Kurshid Khudoykulov, Salman Tariq
Summary: This study examines how macroeconomic factors influence India's carbon emission intensity levels and confirms the impact of factors such as foreign remittance receipts, energy consumption, urbanization, and technological progress. The findings provide policy recommendations for India's carbon emission reduction targets.
Article
Geosciences, Multidisciplinary
Wei Liu, Bo Wan
Summary: Magmatic-hydrothermal systems play a crucial role in transporting materials and potentially affecting Earth's long-term environment. This study investigates the duration of prograde metamorphism induced by fluid infiltration and the amount of carbon released by skarn ore deposits. The findings reveal that skarn ore deposits can efficiently decarbonize CO2 at a high rate, surpassing volcanism in different tectonic settings. The CO2 flux of skarn deposits increases over time and reaches a maximum value at the J/K boundary, providing an important previously unquantified source of outgassing in the subduction zone.
Article
Geosciences, Multidisciplinary
Haikuan Nie, Pei Li, Qing Chen, Zhijun Jin, Quanyou Liu, Wei Dang, Qian Chen, Jianghui Ding, Changbo Zhai
Summary: This study investigates the shale quality and shale gas potential in the upper Ordovician to lower Silurian formations in the Sichuan Basin of southern China. The distribution and characteristics of organic-rich shale are analyzed, aiding in the assessment of shale gas potential and identification of sweet spots.
Article
Geosciences, Multidisciplinary
Najia Saqib, Shujaat Abbas, Ilhan Ozturk, Muntasir Murshed, Malgorzata Tarczynska-Luniewska, Mohammad Mahtab Alam, Waldemar Tarczynski
Summary: This study examines the impact of economic growth, financial development, eco-friendly ICT, renewable energy, and human capital on lowering carbon footprint in the world's top polluting economies from 1993 to 2020. The findings suggest that eco-friendly ICT has the potential to effectively alleviate pollution, and financial development, renewable energy, and environmental technology are proposed as potential solutions for reducing carbon emissions.
Article
Geosciences, Multidisciplinary
Hikmat Salam, Syed Ali Turab, Asghar Ali, M. Qasim Jan, Norasiah Sulaiman, Mohd Basril Iswadi Basori
Summary: The Kahi melange complex in NW Pakistan is an important record of the tectonic evolution between the Indian plate and the Afghan block, consisting of highly dismembered ophiolitic and sedimentary units.
Article
Geosciences, Multidisciplinary
Er-Kun Xue, Wei Wang, David Chew, Manoj K. Pandit, Xin Deng, Yang Tian, Xi-Run Tong, Jun-Hong Zhao
Summary: The study reveals the presence of water-fluxed melting during the Wuyi-Yunkai Orogeny in South China. These water-fluxed melting quartzo-feldspathic migmatites formed during the early Paleozoic and were melted through reactions involving water-saturated quartz, feldspar, biotite, and K-feldspar. The findings highlight the significance of water-fluxed anatexis in the differentiation of the continental crust during orogenesis.
Article
Geosciences, Multidisciplinary
Hadi Shafaii Moghadam, Qiu-Li Li, William L. Griffin, Xian-Hua Li, Orhan Karsli, Christopher J. Spencer, Jose F. Santos, Maria Kirchenbaur, Sobhi Nasir, Suzanne Y. O'Reilly
Summary: Understanding the crustal growth, reworking, and geodynamics of the northern continental margin of Gondwana during the Ediacaran to Silurian times is crucial for the paleogeographic reconstruction of Gondwana. This study uses various analytical methods to evaluate the magmatic history of this region and obtain relevant detrital zircon data. The results provide valuable insights into the crustal evolution and tectonic activities in the northern Gondwana region.
Article
Geosciences, Multidisciplinary
Laura Petrescu, Felix Borleanu, Emanuel Kaestle, Randell Stephenson, Anica Placinta, Oleksandr Ivanovich Liashchuk
Summary: This study investigates the seismic structure of the Eastern European lithosphere and the transition from Precambrian to Phanerozoic Europe. The results show that the crust thickens across the Trans European Suture Zone boundary and the mantle is seismically faster beneath younger terranes. The Precambrian building blocks exhibit contrasting seismic fabrics, with the Baltic orogens characterized by uniform crust and the Sarmatia region showing alternating high and low velocity layers.
Article
Geosciences, Multidisciplinary
Dongya Zou, Hongfu Zhang
Summary: This study analyzes the U-Pb-Hf-O isotopes of zircons in felsic granulite xenoliths from the Fuxin late Cretaceous basalts in the North China Craton to evaluate the role of magma underplating in modifying the Archean lower crust. The results show that long-lived magma underplating occurred beneath the Fuxin region during the Mesozoic, with underplated magmas originating from the lithospheric mantle and later from the depleted asthenospheric mantle. This study concludes that magma underplating not only provided heat for remelting, but also added exotic material and weakened the lower crust, leading to its destruction.
Article
Geosciences, Multidisciplinary
Yu Han, Yingchang Cao, Chao Liang, Keyu Liu, Fang Hao
Summary: A paleoclimate reconstruction based on high-resolution records from lacustrine shale in the Bohai Bay Basin reveals a shift in orbital variability and a humidification event at -41.9 Ma in East Asia. The intensification of the East Asian monsoons at this time was likely a response to the elevated atmospheric pCO2 during the concurrent global warming.
Article
Geosciences, Multidisciplinary
Francesca Innocenzi, Sara Ronca, Stephen Foley, Samuele Agostini, Michele Lustrino
Summary: This study investigates two volcanic provinces in the western branch of the East African Rift and finds that the volcanic products show wide variability in chemical and mineralogical characteristics. Petrographic and geochemical analysis reveals enriched and heterogeneous sub-lithospheric mantle sources. The differences in isotopic features between the two volcanic provinces may indicate changes in the composition, mineralogy, and depth of melting in the lithospheric mantle source.
