Article
Geology
A. Triantafyllou, M. N. Ducea, G. Jepson, J. D. Hernandez-Montenegro, A. Bisch, J. Ganne
Summary: Trace elements in zircon, particularly the Eu anomaly, provide useful information about the crystallization environment and magmatic conditions. Statistical analysis of detrital zircons revealed a significant decrease in Eu anomaly around 2.5 billion years ago and an important increase around 0.9 billion years ago. These variations might be attributed to long-term changes in the chemical system of the mafic source.
Article
Geology
Icaro Dias da Silva, Emilio Gonzalez Clavijo, Alejandro Diez-Montes
Summary: The article discusses the structural morphology and geological evolution of the Iberian Massif in the Variscan Belt, focusing on the formation of two folds (IAO and CIO) in the Late-Variscan stage and their relationship. It proposes a hypothesis that the CIO is produced by lateral extrusion, with the FMC potentially serving as the source area for the extrusion wedge.
INTERNATIONAL GEOLOGY REVIEW
(2021)
Article
Geochemistry & Geophysics
Julien Leger, Raphael Pik, Bouchaib Tibari, Sebastien Ternois, Mary Ford, Chantal Peiffert, Julien Mercadier
Summary: This study evaluates the potential age error associated with the double ablation procedure and reports the in situ (U-Th-Sm)/He double-ablation dating of 249 zircons from the Fish Canyon Tuff locality. It shows that the concentric double-ablation procedure in minerals with U-Th-Sm zoning can generate a significant (U-Th-Sm)/He age error, resulting in over-scattering and/or an offset of the mean age.
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
(2023)
Article
Geochemistry & Geophysics
Jorge Acevedo, Gabriela Fernandez-Viejo, Sergio Llana-Funez, Carlos Lopez-Fernandez, Javier Olona, Diego Perez-Millan
Summary: The cross-correlation of ambient noise records provides valuable insights into the crustal structure of the Variscan orogen in NW Iberia. The study presents high-resolution shear wave velocity and radial anisotropy variation models of the upper crust, revealing the geological domains and major structures associated with the orogeny. The results also indicate variations in elastic properties and anisotropy patterns with depth.
Article
Geochemistry & Geophysics
EmilyE. Zawacki, Matthijs C. van soest, Kip V. Hodges, Jennifer J. Scott, Melanie Barboni, Manfred R. Strecker, Craig S. Feibel, Christopher J. Campisano, J. Ramon Arrowsmith
Summary: Detrital zircons from two major rift basins in the East African Rift System are analyzed to understand sediment provenance, landscape dynamics, and the volcanic evolution of the rift system. The results show that the sediments mainly come from silicic volcanic rocks, and the zircon ages correspond to the timing of rift activity. The discrepancy between (U-Th)/He and U/Pb ages of zircons may be related to late volcanic and/or hydrothermal activity.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Masahiro Ohkawa, Makoto Takeuchi, Yuxiao Li, Sakurako Yabuta, Koshi Yamamoto
Summary: This study investigates the tectonic evolution and provenance characteristics of the late Paleozoic to early Mesozoic collision-related orogeny in Japan using morphological analysis and U-Pb ages of detrital zircons. The results show that the late Paleozoic zircons were derived from nearby sources, while the pre-late Paleozoic zircons were supplied from distant sources under strong hydrodynamic conditions. Combining the geological information of East Asia, the study reveals a change in sources from the Southern zone of the Maizuru Belt to multiple areas, supporting the collision of the island arc and continental margin of the Sino-Korean Block during the middle Permian.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Yiming Liu, Qingguo Zhai, Peiyuan Hu, Yue Tang, Haoyang Lee
Summary: This study presents new detrital zircon U-Pb and Lu-Hf isotopic data to reveal the evolution of the Qiangtang terrane and the tectonic affinity of its subterranes. The detrital zircons from the North Qiangtang subterranes were likely derived from arc magmatic rocks associated with the subduction of the Paleo-Tethys oceanic lithosphere, while those from the South Qiangtang subterranes show similarities with other terranes such as South Qiangtang, Lhasa, Himalaya, and the Indian Gondwana. The North and South Qiangtang subterranes originated from the Yangtze block and Gondwana, respectively, and the northward subduction of the Paleo-Tethys oceanic lithosphere continued at least until the Late Devonian to Triassic.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Geography, Physical
Xiaochen Ma, Jiasheng Wang, Thomas J. Algeo, Zhou Wang, Yue Cen, Can Chen, Dahe Chen, Junchen Lu, Yuzhou Yang
Summary: The Neoproterozoic strata in southwestern Hubei Province provide important information about the origin of Cryogenian sedimentary rocks in South China. New detrital zircon U-Pb ages reveal that the deposition of the Datangpo Formation occurred around 661 million years ago. These findings suggest that the siliciclastic deposits of the Cryogenian Nanhua System in southwestern Hubei Province were derived from the northern and northwestern margins of the Yangtze Block.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Sherif Mansour, Noriko Hasebe, Akihiro Tamura
Summary: Zircon U-Pb geochronology is a valuable tool for exploring eroded crusts and identifying the components of the Arabian-Nubian Shield. The study of detrital sedimentary rocks in the Somr El-Qaa area reveals three main sources: Pre-Pan-African, Pan-African, and Post-Pan-African, indicating the existence of different geological events in the region.
PRECAMBRIAN RESEARCH
(2023)
Article
Geology
Biao Liu, Ping-He Sun, Qian-Hong Wu, Jiang-Bo Jiang, Huan Li, Jeff Dick, Hua Kong, Xiao-Shuang Xi, Han Zheng, Guo-Xiong Cao, Yu-Ting Meng
Summary: The Kanggur, Kangxi, and Matoutan deposits are important orogenic gold deposits located in the Kang-gurtag gold mineralization belt of Eastern Tianshan in Northwest China. These deposits formed during the Late Carboniferous collisional tectonism and are associated with metamorphic fluids and pyroclastic rocks in the country rocks. The deposits experienced four deformation events and show evidence of hydrothermal alteration.
ORE GEOLOGY REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Jeremie Melleton, Eric Gloaguen, Dirk Frei, Alexandre Lima, Romeu Vieira, Tania Martins
Summary: Rare-element granites and pegmatites are important sources of raw materials for clean, green and high technologies. However, the mechanisms of their origin are still not fully understood. In situ U-Pb dating of columbite-group minerals from rare-element granites and pegmatites in the Iberian Variscan belt provides new constraints on the generation of these rare-element melts.
BSGF-EARTH SCIENCES BULLETIN
(2022)
Article
Geosciences, Multidisciplinary
Semih Gursu, Serhat Koksal, Andreas Moeller, George D. Kamenov, M. Cemal Goncuoglu, Kevin Hefferan, Paul A. Mueller, Huseyin Kozlu
Summary: The detrital U-Pb age peaks and Lu-Hf systematics of peri-Gondwanan units in southern Turkey suggest their derivation from Neoproterozoic igneous suites in the Sinai Peninsula, Israel, and the Eastern Desert. These sediments were likely derived from sedimentary recycling processes in a continental back-arc tectonic setting. The provenance of the sediments correlates with nearby regions such as the Nubian Shield and Saharan Metacraton.
Article
Geology
Jiri Zak, Martin Svojtka, Ianko Gerdjikov, Alexandre Kounov, Dian A. Vangelov
Summary: The study focuses on analyzing four lithotectonic units in the Balkans using detrital zircon U-Pb geochronology to understand their formation and origins. Through statistical comparison and multidimensional scaling, the Balkan terranes are compared with other terranes from the Eastern Alps to Iran, revealing their paleogeographic positions and significant dextral strike-slip displacements.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Energy & Fuels
Wei Wang, Xianghua Yang, Hongtao Zhu, Li Huang
Summary: The in situ U-Pb dating of sandy conglomerate samples from the Huanghekou Sag allowed for stratigraphic correlation and revealed that the sedimentary sequence could be referred to as the Kongdian Formation with an age range of 65-50.5 Ma. Petrological analysis suggested at least three lithostratigraphic members, with Member 1 showing significant potential for energy exploration.
Article
Geosciences, Multidisciplinary
Yilin Gao, Xiaoping Long, Jin Luo, Yunpeng Dong, Caiyun Lan, Zongying Huang, Jing Zhao
Summary: Research reveals that the three distinct terranes of the Qilian Orogenic Belt were once a united block in the late Mesoproterozoic, and have a close relationship with South China from the Mesoproterozoic to Early Neoproterozoic. Zircon ages and Hf isotopic data indicate that the tectonic evolution of different terranes was influenced by the transition from breakup of Columbia to the assembly of Rodinia.
PRECAMBRIAN RESEARCH
(2021)
Article
Geology
Ruben Diez Fernandez, Ricardo Arenas, Esther Rojo-Perez, Sonia Sanchez Martinez, Jose Manuel Fuenlabrada
Summary: The Neoproterozoic and Palaeozoic rocks of the Merida Massif in SW Iberia have been grouped into tectonostratigraphic units, separated by crustal-scale thrusts and/or extensional detachments. This tectonic setting was formed during the Cadomian Orogeny and later modified by the Variscan Orogeny, resulting in the juxtaposition of different units and the formation of folds and thrusts. The Merida Ophiolite represents a Cadomian suture zone exposure in the Gondwanan realm, reflecting inland transference of allochthonous terranes onto mainland Gondwana during different geological periods.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Geosciences, Multidisciplinary
Andreas Gaertner, Mandy Hofmann, Johannes Zieger, Anja Sagawe, Rita Krause, Marika Stutzriemer, Subani Gesang, Axel Gerdes, Linda Marko, Cristiano Lana, Ulf Linnemann
Summary: Extensive morphological and age studies on detrital zircon grains from modern sands of Namibia reveal complex mechanisms of sediment transport. A large Southern Namibian Sediment Vortex and a modified model of the Orange River sand highway are hypothesized based on the results of this study. The potential impact of spatial variations of erosion rates on sediment movements towards the interior of the continent is also highlighted. Additionally, detrital zircon morphology and large geo-databases are identified as valuable tools for provenance analysis.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
Byron Solis-Alulima, Jacobo Abati, Alicia Lopez-Carmona, Gabriel Gutierrez-Alonso, Javier Fernandez-Suarez, Daniel F. Stockli
Summary: This study presents U-Pb geochronological data on detrital zircon grains from the metasedimentary successions in the Sierra Albarrana Domain. The results suggest that this domain is likely part of the autochthonous section of the Central Iberian Zone and the sedimentary provenance may be from the Saharan Metacraton with possible minor input from the Tuareg Shield. The study also compares the U-Pb zircon data with existing data from Neoproterozoic and Cambrian rocks in the Iberian Massif using multidimensional scaling techniques.
Editorial Material
Geochemistry & Geophysics
Ruben Diez Fernandez, Carlos Fernandez, Ricardo Arenas, Irene Novo-Fernandez
Summary: Geological mapping, structural data, and analytical modeling support the notion that the Central Unit belongs to a rootless Devonian suture zone that underwent late uplift and upright folding. However, other studies overlook this evidence and fail to interpret the structural dip angle accurately in seismic images. Overall, the model proposed by Diez Fernandez et al. remains valid.
Article
Geology
Bidyananda Maibam, Richard M. Palin, Axel Gerdes, Richard W. White, Stephen Foley
Summary: The tectonic significance of blueschist-facies rocks associated with the Indo-Myanmar ophiolite belt is uncertain due to the lack of detailed petrological study and reliable age data. This study presents new petrological and geochronological data from the Nagaland complex, northeast India, which provide constraints on the pressure-temperature conditions and ages of metamorphism. The results suggest that the region experienced high-pressure prograde-to-peak metamorphism followed by lower-pressure retrograde metamorphism, with peak metamorphism dated at approximately 95 Ma and retrograde metamorphism at approximately 90 Ma. The study also indicates an exhumation rate of approximately 1 cm/year, consistent with Phanerozoic plate tectonic rates.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geosciences, Multidisciplinary
Esther Rojo-Perez, Ulf Linnemann, Mandy Hofmann, Jose M. Fuenlabrada, Johannes Zieger, Javier Fernandez-Suarez, Pilar Andonaegui, Sonia Sanchez Martinez, Ruben Diez Fernandez, Ricardo Arenas
Summary: In the SW region of the Iberian Massif, changes in the subduction angle, subduction rate, mantle sources, and crustal materials have a recognizable cyclicality in the peri-Gondwanan Ediacaran arc section. Through geochronology, geochemistry, and isotopic sources, these changes can be traced in the magmatic bodies. The study highlights the importance of subduction erosion mechanisms in the peri-Gondwana margin during the Neoproterozoic to Early Cambrian times.
Article
Geology
R. Arenas, E. Rojo-Perez, R. Diez Fernandez, R. Albert, I Novo-Fernandez, S. Sanchez Martinez, J. M. Fuenlabrada, P. Andonaegui, D. Moreno-Martin, A. Gerdes, A. Garcia-Casco
Summary: The Ossa-Morena Complex in the SW Iberian Massif contains a stack of units with different origins, including a Cadomian ophiolite, the Merida Ophiolite. The Cadomian terranes in this complex are important for reconstructing the Ediacaran margin of Gondwana in NW Africa. The Merida Ophiolite represents oceanic lithosphere of a back-arc basin and played a role in the collision between the volcanic arc and the Gondwana margin.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Geology
Irene Novo-Fernandez, Ricardo Arenas, Ruben Diez Fernandez, Antonio Garcia-Casco
Summary: In the most internal zone of the Variscan Orogen, evidence of almost continuous metamorphism and accretion onto the continental margin of Gondwana for about 60 million years has been found. This includes three successive (ultra)high-P metamorphic episodes caused by subduction of peri-Gondwanan lithosphere, followed by the continental collision between Gondwana and Laurussia. The geological events involved the formation of high-P, high-T metamorphic belts, the opening and closing of Middle Devonian oceanic basins, and the accretion of ophiolites.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Multidisciplinary Sciences
Daniel Munoz-Lopez, David Cruset, Jaume Verges, Irene Cantarero, Antonio Benedicto, Vinyet Baques, Xavier Mangenot, Richard Albert, Axel Gerdes, Aratz Beranoaguirre, Anna Trave
Summary: This study applies U-Pb dating and geochemical analysis to fracture-filling calcite veins and host carbonates from the Boixols-Sant Corneli anticline in the Southern Pyrenees. The analysis provides insights into the absolute timing of fracturing and mineralization, the age and duration of fold evolution, and the variations and implications of fluid behavior across the anticline.
Article
Geosciences, Multidisciplinary
Byron Solis-Alulima, Jacobo Abati, Alicia Lopez-Carmona, Gabriel Gutierrez-Alonso, Javier Fernandez-Suarez, Daniel F. F. Stockli
Summary: This study analyzes Lu-Hf data on detrital zircon grains from the Lower Paleozoic metasedimentary successions in the Sierra Albarrana Domain of the SW Iberian Massif, providing new information about their origin, record of continental crustal evolution, and geological affinity. Previous U-Pb data on detrital zircon grains in this region show two main age populations at approximately 595 Ma and 1.90 Ga. The Ediacaran events suggest the presence of a magmatic arc with input of juvenile magmas intruding into the Eburnean basement of Gondwana, and a possible mixing with it. The Paleoproterozoic zircon population corresponds to the Eburnean Orogeny. The study also suggests a possible affinity with the Central Iberian Zone during Ediacaran-Cambrian times but different settings during the Paleoproterozoic.
JOURNAL OF THE GEOLOGICAL SOCIETY
(2023)
Article
Geochemistry & Geophysics
Byron Solis-Alulima, Alicia Lopez-Carmona, Jacobo Abati, Yamirka Rojas-Agramonte, Romain Bousquet, Jose Gonzalez del Tanago
Summary: This study provides new insights into the polycyclic metamorphic evolution of the Sierra Albarrana Domain in the SW Iberian Massif. Mineral assemblages and petrological modeling were used to accurately reproduce the assemblage of St-Grt-And pelitic schists, but faced difficulties in modeling And-Grt-Sil-bearing schists. The study also investigates the influence of Fe3+ on phase relations in pelites and records a regional low-pressure metamorphic event followed by exhumation and a localized medium-pressure metamorphic event.
Article
Geosciences, Multidisciplinary
E. Rojo-Perez, E. Druguet, J. M. Casas, J. A. Proenza, J. M. Fuenlabrada, S. Sanchez Martinez, A. Garcia-Casco, R. Arenas
Summary: The North African margin of Gondwana formed through subduction and accretion during Ediacaran to Cambrian times. This study focuses on the Cadomian metasedimentary rocks in the Cap de Creus Massif and their relation to other regions in the North African Gondwanan margin. The results indicate an eastern location of the Cap de Creus Massif in the Ediacaran-Cambrian peri-Gondwanan magmatic arc.
PRECAMBRIAN RESEARCH
(2023)
Article
Geochemistry & Geophysics
Diana Moreno-Martin, Ruben Diez Fernandez, Ricardo Arenas, Esther Rojo-Perez, Irene Novo-Fernandez, Sonia Sanchez Martinez
Summary: The Cadomian Orogeny created a subduction-related mountain range along the periphery of Gondwana and formed the basement of the Iberian Massif. Detailed analysis in SW Iberia has identified three deformation phases and provided insights into the building and dismantling processes of the Cadomian Orogen. The first phase involved tabular plutons during the formation of a continental arc, the second phase produced folding and thickening of the crust, and the third phase resulted in an orogen-parallel dome with extensional flow. The formation of the Cadomian Orogen was associated with ongoing subduction, while its dismantling during the Early Paleozoic was driven by oblique convergence.
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.
