Article
Geochemistry & Geophysics
Simon Thivet, Kai-Uwe Hess, Donald B. Dingwell, Carole Berthod, Lucia Gurioli, Andrea Di Muro, Tristan Lacombe, Jean-Christophe Komorowski
Summary: In July 2018, a large submarine eruption occurred east of Mayotte Island. Scientists collected samples of fresh lava and volcanic bomb rims from the newly formed Fani Maore 'Edifice and the Horse-Shoe Area. By using a novel combination of thermal analysis and mass spectrometry, the volatile distributions and compositions of the samples were determined. This method provides a quantitative description of volatile behavior in magmatic systems and eruptions.
Article
Geochemistry & Geophysics
Carole Berthod, Etienne Medard, Andrea Di Muro, Theo Hassen Ali, Lucia Gurioli, Catherine Chauvel, Jean-Christophe Komorowski, Patrick Bachelery, Aline Peltier, Mhammed Benbakkar, Jean-Luc Devidal, Pascale Besson, Anne Le Friant, Christine Deplus, Sophie Nowak, Isabelle Thinon, Pierre Burckel, Samia Hidalgo, Nathalie Feuillet, Stephan Jorry, Yves Fouquet
Summary: Since 2018, a major eruption has been occurring on the submarine east flank of Mayotte Island, revealing a complex magmatic system with multiple levels of magma storage and three possible eruption scenarios. Sample analysis from oceanographic cruises conducted in the region provides insights into the formation of the volcanic ridge and the evolution of basanitic and phonolitic magmas.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2021)
Article
Geochemistry & Geophysics
Patrick Merlin Wagsong Njombie, Robert Temdjim, Nicaise Blaise Ngongang Tchuimegnie, Stephen F. Foley, Francois Xavier Onana Mebara
Summary: The Adamawa Volcanic Massif in the Cameroon Volcanic Line is mainly composed of silica-undersaturated basaltic lavas, but also shows contributions from pyroxenite sources. Olivine phenocrysts in the lavas support the presence of pyroxenite in the source of primary melts. There is evidence of a mixture of peridotite and silica-deficient pyroxenite lithologies in the primary melts, with variable contributions on a local scale.
Article
Geochemistry & Geophysics
Emmanuel A. Njinju, D. Sarah Stamps, Kodi Neumiller, James Gallager
Summary: The Rungwe Volcanic Province is located in a region of magma-assisted rifting within the magma-poor Western Branch of the East African Rift. The source of sublithospheric melt for the RVP is still ambiguous, with potential sources being thermal perturbations from the African superplume or the Kenyan plume, as well as decompression melting due to lithospheric modulated convection. Further research suggests that upwelling of plume materials entrained in lithospheric modulated convection may play a role in sublithospheric melt generation beneath the RVP.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geosciences, Multidisciplinary
Ciro Cucciniello, Celestino Grifa, Roberto de'Gennaro, Luigi Franciosi, Ivana Rocco, Vincenzo Morra, Leone Melluso
Summary: The Bobaomby volcanic field in Madagascar is a diverse volcanic area with varying rock compositions, suggesting a complex magma source and crystallization processes.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2023)
Article
Geochemistry & Geophysics
A. N. E. Asaah, T. Yokoyama, H. Iwamori, F. T. Aka, T. Kuritani, T. Usui, J. Tamen, M. Gountie Dedzo, B. Chako-Tchamabe, T. Hasegawa, L. A. Nche, T. Ohba
Summary: This study investigates the mantle source and isotopic characteristics of mafic lavas from Mt. Oku along the Cameroon Volcanic Line. The lavas are found to be derived from the asthenosphere and enriched components in the subcontinental lithospheric mantle. Analysis of isotopic composition reveals a mixing of at least three mantle end-members: HIMU-DMM-EM1 in the petrogenesis of Mt. Oku lavas.
Article
Geosciences, Multidisciplinary
Wei Gan, Zhenmin Jin, Ziqi Fang, Wenlong Liu
Summary: Peridotite xenoliths in Jiaohe City, NE China, provide key evidence for understanding the subcontinental lithospheric mantle's nature and evolution. By studying their geochemical characteristics, microstructures, and lattice preferred orientations, it was found that almost anhydrous olivine in these xenoliths deforms predominantly through dislocation creep. The observed stresses and equilibration temperature range provide rheological constraints and suggest a heterogeneous deformation evolution in the Jiaohe region, possibly related to the Tan-Lu fault.
JOURNAL OF EARTH SCIENCE
(2023)
Article
Geochemistry & Geophysics
Benjamin H. Chilson-Parks, Fernando M. Calabozo, Alberto E. Saal, Zhengrong Wang, Soumen Mallick, Ivan A. Petrinovic, Frederick A. Frey
Summary: This study reports the major and trace element characteristics as well as the isotopic ratios of volcanic rocks in the Payenia region of Argentina. The results suggest that early mantle metasomatism and subsequent melting contribute significantly to the compositional range of the rocks in this area.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geochemistry & Geophysics
Jacek Puziewicz, Sonja Aulbach, Mary-Alix Kaczmarek, Theodoros Ntaflos, Axel Gerdes, Hubert Mazurek, Anna Kukula, Magdalena Matusiak-Malek, Sylvin S. T. Tedonkenfack, Malgorzata Ziobro-Mikrut
Summary: Based on the study of peridotite and websterite from the Cameroon volcanic line, it is concluded that these rocks resemble mid-ocean ridge basalts and were formed during the Paleoproterozoic era with influence from the Eburnean orogeny, while the regionally recognized Pan-African event had little influence.
JOURNAL OF PETROLOGY
(2023)
Article
Geochemistry & Geophysics
Xu Liu, Peng Peng, Ross N. Mitchell, Chong Wang, Jianli Kang
Summary: A study found that there are two distinct types of metasomatism in the Late Triassic syenite intrusions around the North China craton. One type is characterized by alteration of juvenile materials from subducting oceanic slabs, while the other type involves ancient materials from subduction of the South China craton. This finding demonstrates that subduction-induced metasomatism can cause heterogeneity in the subcontinental lithospheric mantle.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geosciences, Multidisciplinary
Zhengyang Qiang, Qingju Wu, Yonghua Li, Fengxue Zhang
Summary: The broadband seismic data collected from temporary stations in the Arxan-Chaihe Volcanic Field (ACVF) over a period of 2 years provides a valuable opportunity to study mantle deformation and geodynamic processes in the NE China intraplate region. The analysis of the data reveals the relationship between mantle deformation and volcanism, with the fossilized extensional deformation in the lithosphere being locally erased by hot mantle upwellings. In addition, the presence of small-scale mantle convection caused by lithospheric delamination explains the sharp swing of fast polarization in the southern region.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Emmanuel A. Njinju, D. Sarah Stamps, Estella A. Atekwana, Tyrone O. Rooney, Tahiry A. Rajaonarison
Summary: Volcanism in the Western Branch of the East African Rift is localized, while in the Eastern Branch it is more widespread. Decompression melting due to lithospheric stretching is a possible mechanism for melt generation beneath the rift, but pre-rift magmatism suggests a role of plume-lithosphere interactions. Our hypothesis is that a thermally heterogeneous asthenosphere interacting with the base of the lithosphere causes localization of deep melt sources in the Western Branch where there are sharp variations in lithospheric thickness. Our results show that sublithospheric heterogeneities have a dominant control on upper mantle flow and melt localization, emphasizing the need to incorporate upper mantle constraints in mantle convection models.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Jashodhara Chaudhury, Supriyo Mitra
Summary: We have used P-wave receiver function analysis and joint inversion with Rayleigh wave dispersion data to model the shear wave velocity structure of subcontinental lithospheric mantle discontinuities beneath NE India. The most prominent discontinuity observed is the Hales Discontinuity beneath the Eastern Himalayan Foreland Basin and Shillong Plateau. We have also identified an intralithospheric discontinuity in the Shillong Plateau station. The resulting models and interpretations provide information about the lithospheric structure and processes in this region.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geosciences, Multidisciplinary
Joshua J. Shea, Isra S. Ezad, Stephen F. Foley, Anthony W. Lanati
Summary: The Eastern Australian Volcanic Province (EAVP) is a discontinuous belt of Cenozoic mafic intraplate volcanoes along the eastern seaboard of Australia, with mantle-derived melts showing large ranges in major element concentrations. The EAVP is classified into three volcanic regions: Northern, Central, and Southern, each with distinct compositions and characteristics. The primitive melt compositions in the EAVP are produced by melting mantle source assemblages involving various proportions of different end-members and likely underwent mantle metasomatism related to past subduction events during the accretion of eastern Australia.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geochemistry & Geophysics
Sylvin S. T. Tedonkenfack, Jacek Puziewicz, Sonja Aulbach, Theodoros Ntaflos, Mary-Alix Kaczmarek, Magdalena Matusiak-Malek, Anna Kukula, Malgorzata Ziobro
Summary: The study focused on the origin and evolution of subcontinental lithospheric mantle (SCLM) through detailed analyses of mantle xenoliths from the Oku Volcanic Group in the Cameroon Volcanic Line. The results suggest that the Befang mantle section was refertilised by MORB-like melt at pressures of 1.0-1.4 GPa and temperatures slightly above 1200-1275 degrees C, leading to the formation of specific crystal structures.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2021)
