Article
Geochemistry & Geophysics
Jingkai Wu, Hangshan Lei, Qian Ma, Zhidan Zhao, Fang-Zhen Teng, Shuangquan Zhang, Brian Cousens, Zhuang Miao, Yiyun Yang, Dong Liu, Qing Wang, Di-Cheng Zhu, Zengqian Hou, Xuanxue Mo
Summary: This paper presents a systematic study on Miocene-Holocene alkali basalts at the southeastern margin of Southeastern Tibetan Plateau. The results indicate that these basalts are comparable to the Cenozoic mantle-derived magmatism in Southeast Asia and may have originated from the Hainan plume.
Review
Geosciences, Multidisciplinary
M. P. Manu Prasanth, J. Gregory Shellnutt, Tung-Yi Lee
Summary: This study addresses the thermal regimes of large igneous provinces (LIPs) in order to evaluate the main mechanisms of supercontinent breakup. It presents the primary magma solutions and mantle potential temperatures (T-P) of LIPs associated with Pangea and its breakup. The LIPs are divided into Pangean and post-Pangean categories based on the stages of Pangea's amalgamation, rifting, and dispersal. The thermal regimes of the Pangean LIPs are consistent with a mantle plume origin, while the post-Pangean LIPs exhibit more complex thermal relations. The study suggests that mantle plumes act as the source of magma composition and thermal energy, but lithospheric processes control the primary driving mechanism of supercontinent rifting.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geochemistry & Geophysics
Lihua Gao, Zhigang Song, Chao Han, Mei Han, Chenlin Zhu, Di Xia, Zuozhen Han, Shuangjian Li
Summary: A suite of Paleogene mafic rocks from the Huimin Sag of the Jiyang Depression were studied to investigate their petrogenesis, mantle source, and characteristics of the related mantle plume. The rocks display characteristics of alkaline basalt and belong to transitional calc-alkaline series. They are enriched in LREEs and depleted in HREEs, similar to Ocean Island Basalt. Based on isotopic and trace elemental analyses, the rocks are identified as intraplate rift-type alkaline basalt and originate from a mantle plume.
Article
Geosciences, Multidisciplinary
Quan Ou, Qiang Wang, Ji-Peng Zeng, Jin-Hui Yang, Hai-Xiang Zhang, Xiao-Ping Xia, Yi-Wei Chen
Summary: Triassic magmatic rocks in northern Qiangtang Block in Tibet, including basalts and rhyolites, were erupted around 237-235 Ma. The rocks show no continuous trends in major-element compositions and are enriched in Light Rare Earth Elements. Basalts and rhyolites may have originated from a common parental magma, according to similar Nd-isotope and REE patterns.
JOURNAL OF ASIAN EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Fanchao Meng, Yulu Tian, Andrew C. Kerr, Wei Wang, Zhiping Wu, Qiang Xu, Qing Du, Yaoqi Zhou, Jiaqi Liu
Summary: Plume-lithosphere interactions play a significant role in the formation of Large Igneous Provinces (LIPs). This study focuses on the Permian Emeishan Large Igneous Province (ELIP) and the role of plume-lithosphere interaction in the formation of basalts in the outer zone. The research findings suggest that the high-Ti basalts in the Sichuan Basin are different from those in the inner zone, indicating different plume-lithosphere interactions in different parts of the ELIP.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Article
Geochemistry & Geophysics
Jun-Hua Yao, Wei-Guang Zhu, Yan-Jun Wang, Hong Zhong, Zhong-Jie Bai, Zhong-Jie Bai
Summary: The study investigates the impact of olivine chemistry on the source lithology of basaltic rocks and provides new insights into the origin and petrogenesis of ELIP high-Ti picrites. The results suggest that the ELIP high-Ti magmas may have been derived from deep-sourced garnet peridotite melts and underwent various magmatic processes to form different types of basalts in the ELIP.
Article
Geosciences, Multidisciplinary
Lu Lu, Yin -Tao Zhang, Zhuang-Fu Li, Kai -Jun Zhang
Summary: The paper investigates the volcanic rock suite in the Halahatang area of the northern Tarim Basin, including basalt and trachy-andesite. The results show that these rocks were formed approximately 290 million years ago, which is generally synchronous with the main episode of magmatism within the Permian Tarim large igneous province. The compositions of the rocks indicate that the basalt shares similarities with typical oceanic island basalts, while the trachy-andesite shows higher enrichments in incompatible elements. The study reveals close relationships between these rock components and interactions between the lithosphere and mantle during magma evolution.
Article
Geology
Meng FanXue, Zhao MengYun, Meng YuanKu
Summary: This study systematically investigates volcanic lavas from the Mid-Atlantic Ridge and provides evidence for the origin of basaltic lavas and the properties of the mantle source. The results suggest that the lavas have isotopically enriched characteristics and might be influenced by the Tristan da Cunha mantle plume.
ACTA PETROLOGICA SINICA
(2023)
Article
Geosciences, Multidisciplinary
Ahmad Ahmadvand, Mohammad Reza Ghorbani, Mir Ali Asghar Mokhtari, Yi Chen, William Amidon, Jose Francisco Santos, Mohammad Paydari
Summary: This study investigates the uncertainty surrounding subduction events during the closure of the Tethyan seas in NW Iran. It presents new geochemical compositions and ages for volcanic rocks, highlighting the complex magmatism processes influenced by mantle sources, slab retreat, and lithospheric mantle magmatism. The findings suggest a link between crustal contamination, mantle partial melting, and the formation of high-Nb basalts during different stages of volcanic activity in the region.
GEOLOGICAL MAGAZINE
(2021)
Article
Geochemistry & Geophysics
Quanshu Yan, Luke Milan, J. Edward Saunders, Xuefa Shi
Summary: This study reports new major and trace element, isotopic compositions and ages for basaltic lavas from seven poorly studied seamounts/guyots in the Western Pacific Seamount Province. The isotopic data of these samples identify four mantle end-members in the source region, supporting the existence of multiple contemporaneous plumelets and a heterogeneous upper mantle reservoir in the region. A proposed model suggests the formation of relict fragments of enriched mantle and their influence on the depleted mantle.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Xiaofei Pan, Yufeng Ren, Zengqian Hou, Yongpeng Ouyang, Xuejing Gong, Qiuyun Li, Yanshen Yang
Summary: The recently discovered basanite dike in the Zaolin area of Jingdezhen, South China, contains various mantle xenocrysts and the melt may have originated from the mantle depth, forming during the rifting regime of the Eocene.
Article
Geochemistry & Geophysics
Nghiem Van Dao, Hiroshi Kitagawa, Eizo Nakamura, Katsura Kobayashi, Thanh Xuan Ngo, Son Hai Trinh
Summary: Vietnam is a major area of volcanic activity in Southeast Asia. This study presents new geochronological and geochemical data for Cenozoic basalts in Vietnam to provide constraints on their origin. The results show chemically distinct sources of basalts in Central and Southern Vietnam, with a clear boundary at 13.5 degrees N. The basalts north of the boundary have isotopic features similar to Enriched Mantle type 2 (EM2) ocean island basalts, while the basalts south of the boundary have isotopic features similar to Enriched Mantle type 1 (EM1) ocean island basalts. These features suggest that the sources of the basalts are generated through the recycling of deeply-subducted crustal lithologies. The subduction of dense oceanic lithosphere can also induce a convecting cell in the upper mantle. Therefore, the different chemistries of basalts in Central and Southern Vietnam represent the surface expression of melting in two different convecting cells, driven by subduction of the Pacific plate and the Indo-Australian plate, respectively.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Engineering, Marine
Ya-Di Sang, Bakhit M. T. Adam, Chun-Feng Li, Liang Huang, Yong-Lin Wen, Jia-Ling Zhang, Yu-Tao Liu
Summary: Through new reflection seismic profiles and gravity modeling, we have studied the crustal structure, tectonic evolution, breakup mechanism, and future evolution of the Central Red Sea Rift. The breakup of continental lithosphere along this rift axis is discontinuous, with limited oceanic crust at the axial deeps. The punctiform breakup and formation of deeps are assisted by mantle upwelling and topographic uplift, controlled by the normal-fault system. The discontinuities within the central troughs will evolve into new deeps, and isolated deeps will grow and connect to become a continuous central trough before transitioning into a unified spreading center.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Geochemistry & Geophysics
Wissale Boukirou, Mohammed Bouabdellah, Anton R. Chakhmouradian, Abdellah Mouttaqi, Ekaterina P. Reguir, Folkmar Hauff, Michel Cuney, Michel Jebrak, Johan Yans, Kaj Hoernle
Summary: The Gleibat Lafhouda dolomite carbonatites of the Moroccan Sahara are three separate cone-shaped plugs that intrude an Archean supracrustal basement rocks. These carbonatites have specific geochemical characteristics and may represent the earliest manifestation of the fragmentation of the Columbia supercontinent at 1.85 Ga.
Article
Geosciences, Multidisciplinary
Paul Slezak, Murray W. Hitzman, David van Acken, Eoin Dunlevy, David Chew, Foteini Drakou, Mark Holdstock
Summary: The Limerick Igneous Suite in County Limerick, SW Ireland, consists of two distinct basaltic igneous units: Knockroe and Knockseefin. These units exhibit various types of volcanic rocks. U.Pb dating of apatite indicates a primary crystallization age of approximately 350 Ma for the Knockroe units. The geological characteristics and isotopic values suggest that the Limerick Igneous Suite shares similarities with ocean island basalts and likely originated from low degrees of partial melting associated with the amalgamation of Laurussia and Gondwana.
JOURNAL OF THE GEOLOGICAL SOCIETY
(2023)
Article
Archaeology
C. Fornacelli, A. Briano, L. Chiarantini, G. Bianchi, M. Benvenuti, M. Giamello, J. S. Kang, I. M. Villa, F. M. Talarico, R. Hodges
Summary: The study of sparse glazed ware from the Donoratico region in Italy in the ninth century utilized petrographic, chemical, and isotopic investigations to examine production technology. The evidence suggested the use of lead oxide flux on an unfired non-calcareous ceramic body, with various sources for PbO identified through isotopic analysis. Tin impurities in the glazes were found to be linked to local lead sources, specifically from Southern Tuscany, and possibly controlled by the Carolingian kings in northern Central Europe.
Article
Computer Science, Information Systems
Roberto Visalli, Gaetano Ortolano, Gaston Godard, Rosolino Cirrincione
Summary: The new Micro-Fabric Analyzer (MFA) utilizes X-ray and optical image features for quantitative extrapolation of rock microstructural features, allowing for more comprehensive analysis compared to traditional edge mineral grain detectors. The MFA toolbox enables low-cost and user-friendly quantification of mineral types, integrated with micro-X-ray maps for extrapolating elemental distribution maps.
ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION
(2021)
Article
Geosciences, Multidisciplinary
Chiara Montemagni, Igor M. Villa
Summary: Dating structurally complex fault rocks can lead to inconsistent ages due to the presence of multiple intergrown mineral generations altered to various degrees. Methods such as electron probe microanalysis and 40Ar/39Ar step-heating are necessary to assess mineral distribution and differentiate coexisting mica generations.
JOURNAL OF THE GEOLOGICAL SOCIETY
(2021)
Article
Geochemistry & Geophysics
Jean-Francois Moyen, Vojtech Janousek, Oscar Laurent, Olivier Bachmann, Jean-Baptiste Jacob, Federico Farina, Patrizia Fiannacca, Arnaud Villaros
Summary: This paper discusses the two competing paradigms regarding the formation of granitic magmas and their implications, emphasizing that both views are based on a large body of evidence and propose that each of them is relevant to some portions of the Earth.
Article
Environmental Sciences
Yeongmin Kim, Insung Lee, James Farquhar, Jisuk Kang, Igor M. Villa, Hyoungbum Kim
Summary: Isotope analysis of sulfur, nitrogen, oxygen, and strontium in precipitation from Seoul, South Korea revealed the predominant influence of fossil fuel emissions on sulfur and nitrogen levels, as well as seasonal variations likely caused by increased coal use for heating in China. The absence of anomalous values in certain sulfur and strontium isotopes indicates a lack of unique signals in Seoul's precipitation.
ENVIRONMENTAL POLLUTION
(2021)
Article
Geosciences, Multidisciplinary
Igor M. Villa
Summary: Dating deformation is challenging due to the complexity of textures and petrogenesis of deformed rocks, as well as the lack of communication between different geochronometer communities. Different methods including hygrochronology, thermochronology, petrochronology, and nanochronology are used to date deformation, each based on different assumptions and scales of analysis.
JOURNAL OF THE GEOLOGICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Igor M. Villa, Norman E. Holden, Antonio Possolo, Ryan Ben Ickert, David Brynn Hibbert, Paul R. Renne, Mauro L. Bonardi, Paul De Bievre
Summary: The IUPAC-IUGS joint Task Group has evaluated the half-lives of six long-lived radioactive nuclides and recommends three robust estimates. However, for other nuclides, further investigations are needed to resolve uncertainties.
PURE AND APPLIED CHEMISTRY
(2022)
Article
Geology
Igor M. Villa, Johannes Glodny, Alexandre Peillod, Alasdair Skelton, Uwe Ring
Summary: Naxos in the Greek Cyclades islands is an important example of polymetamorphism that has recorded different metamorphic events in different parts of the island. A new approach using electron probe microanalyzer (EPMA) characterization of white mica (WM) and Ar-39-Ar-40-Rb-Sr multichronometry is proposed to study these events. The study reveals the presence of five different generations of WM and provides insights into the ages and metamorphic history of the island. This approach has potential applications in reconstructing polyphase metamorphic histories worldwide.
JOURNAL OF METAMORPHIC GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Lorenzo Fedele, Javad Mehdipour Ghazi, Samuele Agostini, Sara Ronca, Francesca Innocenzi, Michele Lustrino
Summary: The Sahand volcano in NW Iran has experienced abundant Late Miocene to Quaternary magmatic activity. This study analyzed the petrography, mineral chemistry, whole-rock geochemistry, and isotope data of Sahand volcano to identify different rock groups and understand their sources and evolution. The research reveals the unique characteristics and temporal evolution of Sahand volcano's magmatic activity and proposes a general model for magmatism in NW Iran.
Article
Geology
Abdelmoniem Masoud, Abdelsalam Elshaafi, Ozgur Karaoglu, Alsedik Abousif, Michele Lustrino
Summary: This study investigates the origin and characteristics of the basaltic rocks in the Cenozoic Gharyan Volcanic Province (GVP) in Libya. The results show that there are two types of basalts in the GVP, which are likely derived from the same mantle source but experienced different degrees of partial melting. The geochemical and isotopic compositions of the Gharyan basalts overlap with those of other volcanic rocks in central Libya and southern Italy. The ages of the basaltic lava series indicate simultaneous volcanic eruptions in the range of 5.4-3.8 Ma, with evidence of an older Oligocene volcanic phase.
ITALIAN JOURNAL OF GEOSCIENCES
(2023)
Article
Geochemistry & Geophysics
Chiara Montemagni, Stefano Zanchetta, Martina Rocca, Igor M. Villa, Corrado Morelli, Volkmar Mair, Andrea Zanchi
Summary: The Vinschgau Shear Zone (VSZ) is an important component of the Austroalpine domain, and its evolution during the Eo-Alpine Orogeny has been studied using detailed structural and petrochronological analyses. The fieldwork-based analyses indicate that the VSZ had a dip angle of 30-50 degrees and an E-W-trending stretching lineation. The shearing temperature was around 350-400 degrees Celsius. 40Ar/39Ar dating shows that the deformation of the VSZ occurred in the Late Cretaceous, with ages ranging from 80 to 97 million years.
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.
Article
Geochemistry & Geophysics
Veronica Peverelli, Alfons Berger, Martin Wille, Thomas Pettke, Pierre Lanari, Igor Maria Villa, Marco Herwegh
Summary: Deformation of polymineralic aggregates can be accommodated by viscous granular flow, with certain minerals undergoing intracrystalline plasticity and dissolution-precipitation under specific conditions. This study investigates the deformation behavior of epidote in granitic rocks deforming under greenschist-facies conditions. Microstructural and geochemical evidence shows dissolution-precipitation of epidote during deformation, along with dynamic recrystallization of quartz and grain boundary sliding. The combined process of grain boundary sliding and dissolution leads to the formation of creep cavities, which not only facilitate the nucleation of new epidote grains but also allow fluid-mediated element transport. Investigating the nature of the fluid involved in deformation, Pb-Sr isotope data suggest the presence of internally recycled fluids and an external fluid component.
Article
Geosciences, Multidisciplinary
Patrizia Fiannacca, Damiano Russo, Eugenio Fazio, Rosolino Cirrincione, Manish A. Mamtani
Summary: The Serre Batholith in Central Calabria represents the intermediate portion of late Variscan continental crust, with upper levels composed of two-mica granodiorites and granites, and lower levels of weakly peraluminous granodiorites. The granitoid rocks in the batholith exhibit deformation microstructures due to tectonic stresses, with a magnetic foliation showing a shortening axis oriented NW-SE. Ongoing studies aim to further investigate the relationship between regional tectonic structures and the emplacement of the late-Variscan Serre Batholith granitoids.