Article
Crystallography
Yifan Wang, Yici Wang, Yunhao Zhang, Yifan Chai, Fengguang Zhao, Guoping Luo
Summary: Diopside glass-ceramics were prepared using the melting method, with the addition of Cr2O3 as a nucleating agent. The presence of Cr3+ in the glass-ceramics played a crucial role in the crystallization process, influencing the phase precipitation.
Article
Geochemistry & Geophysics
Alexey Vladimirovich Kargin, Anna Andreevna Nosova, Ludmila Vyacheslavovna Sazonova, Vladimir Vasilievich Tretyachenko, Yulia Olegovna Larionova, Elena Vladimirovna Kovalchuk
Summary: The study of the Kepino kimberlites in Russia provides new insights into the evolution of kimberlitic magmas, showing how the melts evolve towards increasing oxygen fugacity and fluid-phase evolution. The primary kimberlitic melts emplaced as sills and pipes may represent a transition to carbonatite melts in the shallow crust. The age of the Kepino kimberlites indicates two episodes of ultramafic alkaline magmatism in the Arkhangelsk province, producing different types of kimberlites.
Article
Geochemistry & Geophysics
Isra S. Ezad, David P. Dobson, Andrew R. Thomson, Eleanor S. Jennings, Simon A. Hunt, John P. Brodholt
Summary: In this study, high-pressure and high-temperature experiments were conducted to investigate the breakdown of garnet in the spinel-lherzolite stability field. The results showed that cascading reactions can reproduce the multilayer, multiphase kelyphites observed in nature. The experiments also confirmed the importance of melts in moderating the reactions towards equilibrium. These findings challenge the assumption that kelyphites are caused by a multistage uplift path and provide insights into the kinetics of garnet breakdown reactions.
JOURNAL OF PETROLOGY
(2022)
Article
Geochemistry & Geophysics
Satya P. Kumar, Azhar M. Shaikh, Suresh C. Patel, Janisar M. Sheikh, Duryadhan Behera, Kamal L. Pruseth, Subramanian Ravi, Sebastian Tappe
Summary: The Mesoproterozoic lamproite dykes in the Banganapalle Lamproite Field of southern India exhibit extensive hydrothermal alteration yet retain fresh spinel, apatite, and rutile in the groundmass. The spinels can be classified into three genetic populations, each representing distinct stages of formation and providing insights into the complex evolution of lamproite magmas.
MINERALOGY AND PETROLOGY
(2021)
Article
Geosciences, Multidisciplinary
Joshua Griffiths, Richard H. Worden, James E. P. Utley, Christian Brostr, Allard W. Martinius, Auwalu Y. Lawan, Ali I. Al-Hajri
Summary: This study focused on determining the distribution and formation mechanisms of grain-coating and pore-filling chlorite in Jurassic deltaic sandstones. Results show that optimum grain-coating chlorite is found in tidal-fluvial sandstones with moderate fluvial influence, while pore-filling chlorite is derived from chlorite-rich Fe-ooids influenced by fluvial processes.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geochemistry & Geophysics
Stephanie Greene, Dorrit E. Jacob, Suzanne Y. O'Reilly
Summary: In this study, the chemical composition of 86 olivines from the Jericho kimberlite in Canada was analyzed, and three main olivine populations were identified. The results indicate a major change in the properties and composition of the kimberlite magma at the 150 km interface between the shallow and deep lithospheric mantle layers, likely due to assimilation of carbonate at this depth.
Article
Multidisciplinary Sciences
Andrew L. Markhard, Jason G. McCoy, Tsz-Leung To, Vamsi K. Mootha
Summary: Oxygen is crucial for supporting life, but methods for manipulating its supply with high spatiotemporal resolution in cells and organisms are lacking. Researchers have introduced a genetic system called SNORCL, which allows for on-demand generation of molecular oxygen inside living cells. This technology has immediate research applications and has the potential for widespread use in research, biotechnology, and medicine.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Geochemistry & Geophysics
Madeline Tovey, Andrea Giuliani, David Phillips, Tom Nowicki, D. Graham Pearson, Yana Fedortchouk, James K. Russell
Summary: In the Lac de Gras kimberlite field, different types of coherent kimberlites (CKs) were identified based on their morphology and occurrence of fragmented olivine microcrysts. Comparisons of petrographic and compositional data revealed that the emplacement styles of CKs are controlled by distinct primary melt compositions. The findings highlight the importance of understanding the role of primary melts in the explosivity and emplacement of kimberlites.
JOURNAL OF PETROLOGY
(2022)
Article
Geochemistry & Geophysics
F. Putzolu, L. Santoro, C. Porto, N. Mondillo, M. Machado, B. Saar De Almeida, A. Bastos, R. Herrington
Summary: The Santa Fe Ni-Co deposit in Central Brazil is a major undeveloped lateritic deposit with a significant amount of indicated and inferred resources. The deposit is characterized by oxide- and phyllosilicate-dominated ore zones, with Ni distribution not controlled by any clear geochemical correlation. Co distribution is atypical compared to other laterites, being correlated with Mn and Cr in the majority of the laterite facies. The Co concentration in spinels is likely related to magmatic and postmagmatic processes that affect the efficiency of Co mobilization and enrichment during supergene alteration.
Article
Geochemistry & Geophysics
Federico Casetta, Rene Asenbaum, Igor Ashchepkov, Olga Ageeva, Rainer Abart, Theodoros Ntaflos
Summary: Kimberlite melts are low volume, volatile-rich melts formed in the asthenosphere at depth >150-250 km. They rise rapidly through the lithosphere due to their buoyancy and exsolution of CO2 triggered by their interaction with the sub-cratonic mantle. The ascent rate of kimberlite melts can vary between 0.1 and 30 m/s, and the overall average ascent rates are comparable to those of typical alkali basalts, suggesting that kimberlite melts start with moderate ascent rates and increase their speed later on.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geology
Acer Jian T. Figueroa, Jillian Aira S. Gabo-Ratio, Pearlyn C. Manalo, Ryohei Takahashi, Hinako Sato, Aljess B. Ramos
Summary: This study investigates the role of diatremes in Acupan epithermal gold deposit and provides a detailed characterization of mineralization processes in the Balatoc diatreme.
ORE GEOLOGY REVIEWS
(2022)
Article
Geology
Pablo Rodriguez-Salgado, Oriol Oms, Jordi Ibanez-Insa, Pere Anadon, Bruno Gomez de Soler, Gerard Campeny, Jordi Agusti
Summary: The sedimentary record of Camp dels Ninots reflects mineralogical shifts that correlate with orbitally forced climate changes. Intervals with allogenic minerals correspond to wet periods, while those with carbonates correlate with dry periods. This cyclicity is attributed to variations in rainfall leading to different lake conditions.
SEDIMENTARY GEOLOGY
(2021)
Review
Chemistry, Physical
Yimeng Huang, Yanhao Dong, Sa Li, Jinhyuk Lee, Chao Wang, Zhi Zhu, Weijiang Xue, Yao Li, Ju Li
Summary: Spinel LiMn2O4, an important cathode material for lithium-ion batteries, has excellent rate performance but suffers from severe degradation, especially under extreme voltages and high temperatures. Current understanding and future trends of spinel cathodes and its derivatives with cubic lattice symmetry are discussed, with a focus on degradation mechanisms and further development.
ADVANCED ENERGY MATERIALS
(2021)
Article
Materials Science, Ceramics
Jinyang Feng, Donghua Wu, Min Long, Kun Lei, Yuna Sun, Xiujian Zhao
Summary: Glass-ceramics with diopside as the main crystalline phase were prepared using waste glass and kaolin via low-temperature powder sintering method. The addition of kaolin and raising sintering temperature promoted the formation of diopside, leading to enhanced bending strength and density in the glass-ceramics.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Xiaoli Wei, Yinghan He, Kaiyang Liu, Pengxiang Gao, Xiuli Chen, Xiaobin Liu, Huanfu Zhou
Summary: A solid-state process was used to synthesize novel microwave dielectric SrMgGe2O6 ceramics, which have monoclinic structures belonging to the C2/c space group. When sintered at 1225 degrees C, dense SrMgGe2O6 ceramic exhibited excellent microwave dielectric properties, with er = 8.58, Qxf = 56800 GHz, and zf =-59.06 ppm/degrees C. The addition of CaTiO3 or TiO2 successfully adjusted the zf value to approximately zero, with the optimal CaTiO3- and TiO2-included composite ceramics exhibiting excellent dielectric properties, with er = 11.74, Qxf = 22056 GHz, zf = +0.18 ppm/degrees C, and epsilon r = 12.32, Qxf = 20930 GHz, zf =-2.27 ppm/degrees C, respectively.
CERAMICS INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Huichuan Liu, Alan R. Hastie, Chiara Maria Petrone
Summary: This study conducted isotope analyses on two ocean island basalt (OIB)-associated enriched mafic intrusions in the Yunnan-Burma region, and found that these rocks may have originated from the subduction recycling of marine sediments and altered oceanic crust.
Article
Geochemistry & Geophysics
L. Notini, M. Scambelluri, A. Tommasi, A. Zanetti, F. Ferri, A. Rodriguez-Vargas, E. Rampone
Summary: This study provides important petrologic information on the mantle wedge above an active subduction zone in Southern Colombia. The researchers analyzed a unique suite of rock samples and found evidence of hydration, metasomatism, and partial melting in the mantle wedge. They also observed variations in lithotypes, textures, and mineral abundance, indicating different interactions with melts and fluids. This study sheds light on the complex petrological processes occurring in the mantle wedge and contributes to our understanding of subduction zone dynamics.
Article
Geochemistry & Geophysics
Sourav Bhattacharjee, Aniket Chakrabarty, Roger H. Mitchell, Suresh Chandra Patel, Evgeniy N. Kozlov, Ekaterina N. Fomina, Monojit Dey, Supratim Pal
Summary: The Hogenakkal complex in India consists of silicate-rich and silicate-poor carbonatites and clinopyroxenites. The formation of carbonatite is influenced by silicate minerals. The carbohydrothermal mineralization in the carbonatites is induced by magma-derived fluids and interactions with the surrounding rocks.
Article
Geochemistry & Geophysics
Jia-Min Wang, Kyle Patrick Larson, Jin-Jiang Zhang, Liang Zhao, Fu-Yuan Wu
Summary: The role of collisional belts in the global carbon budget is controversial. This study reveals a previously unrecognized carbon source in the collisional orogen of the Himalayas, where metamorphism of carbonate-bearing rocks in the hanging wall resulted in significant CO2 degassing.
Article
Geochemistry & Geophysics
Joseph Martial Akame, Elson Paiva Oliveira, Vinciane Debaille, Marc Poujol, Bernhard Schulz, Dieudonnee Bisso, Fabien Humbert, Serge Parfait Koah Na Lebogo, Philmont Zo'o Zame
Summary: Archean granitoids play key roles in the crustal evolution and can provide important insights into early geologic processes.
Article
Geochemistry & Geophysics
Xiguang Huang, Jun He, Jingxin Zhao, Jingzhao Dou, Weiyong Li, Aimin Hu, Ge Liu, Yiru Ji, Fukun Chen, Shuangqing Li
Summary: This study investigates the zircon ages and whole-rock geochemical data of Late Paleozoic magmatic rocks in the Western Yunnan Tethyan belt to identify the origin and mechanism of mantle melting. The results suggest that these magmatic rocks may originate from different mantle domains that were metasomatized by slab-derived fluids and sediment-derived melts.