Letter
Geosciences, Multidisciplinary
Ryan Porter, Mary Reid
Summary: The thermal regime of the continental lithosphere in North America was evaluated using seismic observations and lab results to estimate temperatures and lithospheric thickness, as well as predict melt distribution in the upper mantle. Results indicate thinner lithosphere and presence of melt in the western US, while thicker lithosphere with absence of melt is observed in the central and eastern US.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Multidisciplinary Sciences
Jason P. Morgan, Paola Vannucchi
Summary: When continents collide, fragments of seafloor can be trapped within the growing orogenic belt, forming a unique form of continental crust and lithosphere known as transmogrified basin. These basins, originally stronger blocks, will eventually become sites for continental rifting. In modern Asia, transmogrifying basins have played a significant role in the formation of mountain belts and the strengthening of the East Asian Monsoon.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Geochemistry & Geophysics
Danqing Liu, Jinghui Guo, Neng Jiang, Jun Hu, Ross N. Mitchell, Wenbo Fan, Qian Mao, Lang Zhao
Summary: The lead isotopes of Earth's silicate rocks pose a problem known as the first Pb paradox, as they are too radiogenic to have formed from meteoritic material. In this study, researchers investigate inaccessible rocks in order to find an unradiogenic reservoir that can balance Earth's bulk composition. By analyzing granulite terrain, granulite xenoliths, and lower crustal-derived granitoids from the northern North China craton, the researchers find that the late Archean lower crust may not be as extremely unradiogenic in Pb isotopic compositions as previously thought, and it appears insufficient to balance the accessible Earth.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Laura G. Sammon, William F. McDonough
Summary: Through the study of global geochemical data on metamorphic rocks, the composition of the deep continental crust was explored, finding that Al2O3, Lu, and Yb show little variation from top to bottom, while SiO2, light rare earth elements, Th, and U have a wider abundance range. Oversampling of mafic lithologies led to predictions being a lower bound on middle crustal composition.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geology
Y. S. Suiekpayev, Y. M. Sapargaliyev, A. Dolgopolova, F. Pirajno, R. Seltmann, S. Khromykh, G. K. Bekenova, P. D. Kotler, M. M. Kravchenko, A. Zh Azelkhanov
Summary: The formation of the Karaotkel Ti-Zr placers is influenced by long-term regional geological processes, coastal wave formation, and subsequent sedimentation. The deposit contains abundant light rare-earth elements, with micro-inclusions of gold and monazite found in geochemical and microprobe analyses. The U-Pb dating technique determined a crystallization age of 287 ± 1 Ma for the deposit.
ORE GEOLOGY REVIEWS
(2021)
Article
Geosciences, Multidisciplinary
Shijie Huang, Zhilin Ye, Dawei Fan, Jingui Xu, Dongzhou Zhang, Wei Chen, Yunqian Kuang, Wenge Zhou
Summary: Seismic tomography revealed a high-velocity anomaly at depths of 100 km to 300 km in the Farallon plate, and the reasons for this anomaly are still debated. Analysis of exhumed eclogites from the Farallon plate showed that the average amount of zoisite in eclogites is -16.0 vol%. To understand the high-velocity anomaly, the behavior of zoisite under high-pressure and high-temperature conditions was investigated using synchrotron single crystal-XRD.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2023)
Article
Geochemistry & Geophysics
Z. J. Sudholz, G. M. Yaxley, A. L. Jaques, G. P. Brey
Summary: The authors recalibrated the exchange of chromium between clinopyroxene and garnet in peridotite as a geobarometer, presenting a new calibration equation. The pressure estimates calculated using the new geobarometer are in good agreement with other geobarometer methods in the range of 2-7 GPa.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2021)
Article
Geochemistry & Geophysics
Ashley Bellas, Shijie Zhong
Summary: This study demonstrates that the initial flexural response of a multilayer lithosphere to a surface load is consistent with the cubic rule, but the decoupling effect of the weak lower crust eventually leads to the load support being solely controlled by the mechanically competent upper crust.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Z. J. Sudholz, D. H. Green, G. M. Yaxley, A. L. Jaques
Summary: The reliability of eight Fe-Mg exchange geothermometers for garnet-bearing peridotites, pyroxenites, and eclogites has been examined and recalibrated using an extensive experimental database. The recalibrated geothermometers show improved precision and accuracy, and can be applied to a wide range of mantle lithologies.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2022)
Article
Geology
Zhai MingGuo, Zhang YanBin, Li QuiLi, Zou Yi, He HaiLong, Shan HouXiang, Liu Bo, Yan ChaoLei, Liu Peng
Summary: The paper emphasizes that the formation of continental lithosphere is the result of continental growth and stabilization, with the continental crust dividing into lower and upper crust, undergoing multiple stages of adjustments, stability and evolution until it becomes capable of bearing the burden of plate tectonics.
ACTA PETROLOGICA SINICA
(2021)
Article
Geochemistry & Geophysics
Congmin Wei, Guojie Meng, Weiwei Wu, Tai Liu, Weipeng Ge, Xueliang Chen, Guoqiang Zhao, Tian He
Summary: This study investigates the spatiotemporal evolution of crustal deformation caused by the 2008 Wenchuan earthquake and its impact on nearby active faults using GPS observations. The results show that post-seismic deformation is asymmetrically distributed on both sides of the Longmenshan fault and decreases with increasing distance from the fault. It is speculated that this evolution is due to the unlocking of the fault after the earthquake, leading to significant post-seismic deformation in the epicentral and surrounding area. Furthermore, the viscoelastic relaxation of the Wenchuan earthquake is the main cause of loading rate variations in the early post-seismic stage in the northeastern Tibetan Plateau.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Z. J. Sudholz, G. M. Yaxley, A. L. Jaques, J. Chen
Summary: The study presents new synthesis experiments conducted in the temperature-dependent exchange of Ni and Mg between garnet and olivine, resulting in an updated Ni-in-garnet geothermometer for more reliable temperature estimates in the upper mantle and kimberlite diamond potential. The calibration can be applied to garnet peridotite xenoliths or monomineralic garnet xenocrysts, offering a more accurate understanding of mantle temperatures and geological processes related to diamond formation.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2021)
Article
Geology
I. Ashchepkov, N. V. Vladykin, H. A. Kalashnyk, N. S. Medvedev, A. Saprykin, H. Downes, O. S. Khmelnikova
Summary: The study of mantle xenocrysts from Devonian kimberlite pipes in the SE Ukrainian Shield provides insights into the mantle structure and evolution beneath the shield. The composition of garnets and minerals suggest the presence of seven distinct layers in the mantle lithosphere, each with different geochemical characteristics.
INTERNATIONAL GEOLOGY REVIEW
(2021)
Article
Geology
Long Yuan, Quanshu Yan
Summary: Shortly after the cessation of the Cenozoic seafloor spreading in the South China Sea, a period of basaltic magmatism occurred in the Indochina Peninsula. This study provides new ages and in situ major and trace element compositions for xenoliths and olivine xenocrysts from basalt flows in Thailand, revealing the properties and origin of the lithospheric mantle under the Indochina Peninsula.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geochemistry & Geophysics
Cedar Hanneson, Martyn J. Unsworth
Summary: Subduction zones are important plate boundaries where various geological processes occur and valuable mineral and geothermal energy resources are formed. This study presents the first regional-scale 3-D resistivity model of the southern Canadian Cordillera, providing new insights into lithospheric structure and fluid distribution.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Sonja Aulbach, Larry M. Heaman, Dorrit E. Jacob, K. S. Viljoen
Editorial Material
Geochemistry & Geophysics
Sonja Aulbach, Nicholas T. Arndt
EARTH AND PLANETARY SCIENCE LETTERS
(2019)
Article
Geochemistry & Geophysics
Sonja Aulbach, Nicholas T. Arndt
EARTH AND PLANETARY SCIENCE LETTERS
(2019)
Article
Geochemistry & Geophysics
A-Bing Lin, Jian-Ping Zheng, Qing Xiong, Sonja Aulbach, Jiang-Gu Lu, Shao-Kui Pan, Hong-Kun Dai, Hui Zhang
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2019)
Article
Geochemistry & Geophysics
Sonja Aulbach, Jing Sun, Sebastian Tappe, Axel Gerdes
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2019)
Article
Geochemistry & Geophysics
Sonja Aulbach, Cristen Symes, Thomas Chacko
GEOCHIMICA ET COSMOCHIMICA ACTA
(2020)
Article
Geochemistry & Geophysics
Sonja Aulbach, Malcolm Massuyeau, Joshua M. Garber, Axel Gerdes, Larry M. Heaman, K. S. Viljoen
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2020)
Article
Geochemistry & Geophysics
Denis Mikhailenko, Alexander Golovin, Andrey Korsakov, Sonja Aulbach, Axel Gerdes, Alexey Ragozin
Article
Geochemistry & Geophysics
A-Bing Lin, Jian-Ping Zheng, Sonja Aulbach, Qing Xiong, Shao-Kui Pan, Axel Gerdes
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Article
Geochemistry & Geophysics
Denis S. Mikhailenko, Sonja Aulbach, Andrey Korsakov, Alexander Golovin, Elena Malygina, Axel Gerdes, Aleksandr S. Stepanov, Yi-Gang Xu
Summary: The study comprehensively investigated seven graphite-diamond-bearing eclogites from the Udachnaya kimberlite pipe in the Siberian craton. The petrological and geochemical evidence suggests that both polymorphic carbon modifications can form in the diamond stability field and provides natural evidence that graphite can be preserved deep within the diamond stability field for an extended period of time. The presence of graphite and diamond inclusions in garnet, omphacite, and kyanite indicates a co-formation close in time to eclogitization.
JOURNAL OF PETROLOGY
(2021)
Article
Multidisciplinary Sciences
Sonja Aulbach, Thomas Stachel
Summary: A study shows that eclogitic minerals trapped in the mantle beneath continents billions of years ago have remained in a stable redox state, as evidenced by the lack of change in minerals found inside ancient diamonds. This suggests that eclogite, a type of rock formed through subduction, is an efficient system for maintaining oxygen balance over long periods of time. It also highlights the importance of eclogite as a source rock for diamonds.
NATURE COMMUNICATIONS
(2022)
Article
Geosciences, Multidisciplinary
A. -Bing Lin, Sonja Aulbach, Jian-Ping Zheng, Ronghua Cai, Jingao Liu, Qing Xiong, Shao-Kui Pan
Summary: The origin and evolution of the sub-continental lithosphere mantle in northeastern China remains controversial. This study investigates the petrology and composition of peridotite xenoliths from Jiaohe, and reveals that lherzolites were formed by adding clinopyroxene and spinel to the protoliths from reducing silicate melts, while harzburgites may have originated from a remnant, highly depleted mantle domain that interacted with oxidizing melts. This study provides important insights into the physico-chemical evolution of the lithosphere and understanding deep lithospheric behavior and plate convergence.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2023)
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
A-Bing Lin, Sonja Aulbach, Jian-Ping Zheng, Laura Uenver-Thiele, Alan B. Woodland, Hong-Fu Zhang
Summary: This study investigated the physicochemical evolution of lherzolitic and harzburgitic peridotites using trace element analysis of olivine and orthopyroxene. The results demonstrate that the trace element compositions of these minerals can provide valuable information about the evolution of the shallow subcontinental lithospheric mantle. The study also highlights the importance of using multiple thermometers and empirical corrections for accurate depth estimates in spinel-facies peridotites.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)