Article
Geochemistry & Geophysics
Benjamin E. Cohen, Darren F. Mark, William S. Cassata, Lara M. Kalnins, Martin R. Lee, Caroline L. Smith, David L. Shuster
Summary: Research found that the shergottites have a wide range of ages, with statistically robust Ar-40/Ar-39 isochron ages ranging from 161+/-9 Ma to 540+/-63 Ma, consistent with other dating methods. These data indicate that, despite experiencing shock metamorphism, the shergottites were sourced from the youngest volcanoes on Mars.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geochemistry & Geophysics
Monika A. Kusiak, Elizaveta Kovaleva, Dennis Vanderliek, Harry Becker, Franziska Wilke, Anja Schreiber, Richard Wirth
Summary: This study investigated the shock features of zircons on the lunar surface using transmission electron microscopy. Various shock-related structures and metamorphic phenomena were observed, but they showed no significant correlation with the ages of zircons. This suggests that the shock events either occurred after the formation of zircons or were too brief to cause noticeable lead loss during shock metamorphism.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2022)
Article
Geosciences, Multidisciplinary
Jin-Peng Luan, Jie Tang, Wen-Liang Xu, Peng Guo, Xin-Yu Long, Shuai Xiong
Summary: This paper presents new geochronological, geochemical, and isotopic data on Neoproterozoic intrusive rocks in the Songnen Massif, aiming to understand their petrogenesis and constrain the composition and crustal growth of the region. The results indicate three episodes of Neoproterozoic magmatism at ca. 950, ca. 856, and ca. 790 Ma, with variations in rock types and elemental compositions. The data suggest that crustal growth mainly occurred in the late Mesoproterozoic and Neoproterozoic in the southern part of the region, while the late Paleoproterozoic in the northern part.
PRECAMBRIAN RESEARCH
(2022)
Article
Astronomy & Astrophysics
M. Ciazela, J. Ciazela, B. Pieterek
Summary: Due to the lack of vegetation and thin atmosphere, Mars has high surface temperature gradients, making it suitable for the DATI approach. Researchers propose a new method for thermal inertia calculation on Mars, based on albedo and short-time-intervals of temperature difference. Testing the method in Valles Marineris yielded consistent results with previous studies, suggesting ongoing intrusive activity at Olympus Mons.
Article
Geology
Yanguang Li, Shuguang Song, Xiaoyong Yang, Zi-Fu Zhao, Jinlong Dong, Xiaofeng Gao, Michael T. D. Wingate, Chao Wang, Meng Li, Mengqi Jin
Summary: Through the research in the Altyn Tagh terranes in northwest China, it is found that the Yapuqiasayi mafic dykes in the North Altyn Tagh have similar age and petrogenetic characteristics to mafic igneous rocks in Australia, South China, Seychelles, Laurentia, and Tarim, indicating a possible relationship with the breakup of the Rodinia supercontinent.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Multidisciplinary Sciences
Bo Pan, Shanaka L. de Silva, Martin Danisik, Axel K. Schmitt, Daniel P. Miggins
Summary: Zircon double dating and other experiments reveal that the Qixiangzhan eruption of Changbaishan-Tianchi volcano in China/DPRK occurred 7.0 ± 0.9 thousand years ago. This eruption is significant and can be correlated with distal ash in Eastern China and Central Japan, serving as a useful stratigraphic marker in East Asia. The study also suggests the presence of a previously unrecognized geomagnetic field excursion during the younger Holocene around 7-8 thousand years ago. Additionally, the research indicates a recurrence rate of approximately 7-8 thousand years for the magma system of Changbaishan-Tianchi volcano in the last two major eruption cycles.
SCIENTIFIC REPORTS
(2022)
Article
Geochemistry & Geophysics
Olivier Vanderhaeghe, Andre-Mayer Anne-Sylvie, Diondoh Mbaguedje, Aurelien Eglinger, Maryse Ohnenstetter, Moussa Isseini, Michel Cuney, Marc Poujol, Marieke Van Lichtervelde
Summary: The Mayo-Kebbi massif in Chad exposes a Neoproterozoic juvenile crustal segment that underwent tectonic accretion in the Central African Orogenic Belt and reworking during the Pan-African orogeny. The Zabili pluton, a part of this segment, is composed of a highly differentiated granite formed by fractional crystallization, with associated uranium mineralization.
MINERALIUM DEPOSITA
(2021)
Article
Multidisciplinary Sciences
Youssef Gharmane, Said Hinaje, Samir Amrani, Youness Taybi, Driss Yaagoub, Mohamed El Fartati
Summary: The Tazekka Variscan massif consists of Meso-Cenozoic cover overlying Paleozoic rocks, which recorded polyphase tectonic stages associated with the emplacement of the magmatic system. The evaluation of tectonic measurements of fault planes allowed the identification of various tectono-magmatic events.
RENDICONTI LINCEI-SCIENZE FISICHE E NATURALI
(2023)
Article
Mineralogy
L. M. Stepanyuk, N. M. Konoval, T. Dovhush, O. Kovtun, O. B. Vysolsky, V. P. Snisar
Summary: The study focused on the porphyry-like biotite-garnet granites from the Sokolivka quarry in the Kirovohrad granite massif, determining their formation age to be 2034 million years ago using the U-Pb isotope method. The U-Pb data of the porphyry-like granites is significantly younger than those from other parts of the massif, suggesting a multistage formation process in the Kirovohrad massif.
MINERALOGICAL JOURNAL-UKRAINE
(2021)
Article
Geosciences, Multidisciplinary
Gaurav Hazarika, Bibhuti Gogoi
Summary: The Kathalguri Pluton in Northeast India shows evidence of Pan-African bimodal magmatism and the important role of magma mixing in its evolution.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2023)
Article
Geochemistry & Geophysics
Xiaohui Li, Zhongyuan Ren, Sanzhong Li, Zhigang Zeng, Huixin Yang, Le Zhang, Kun Guo, Xiaoyuan Wang
Summary: By measuring the chemical compositions in olivine-hosted melt inclusions in basaltic volcanic rocks, the study revealed that melt inclusions may preserve more information about magmatic processes than their host whole rocks, providing insights into the magmatic processes of erupted lavas in an incipient epicontinental back-arc basin in the western Pacific. The study also identified two distinct groups of melt inclusions based on trace elements and Pb isotopes, suggesting compositional heterogeneity of magma sources and the mixing of magmas from different sources beneath the southern Okinawa Trough due to Philippine Sea Plate subduction and preexisting intraplate magmatism.
Article
Geology
Jianzhou Tang, Jian Cheng, Zhicheng Zhang, Jinzhuang Xue, Bo Liu, Tiejun Duan, Weijia Zhan, Cong Ding, Qi Wang, Huaihui Zhang, Yunxi Meng
Summary: Through various analytical methods, this study reveals the Late Permian-Carboniferous felsic magmatic rocks in central Inner Mongolia, China, and sheds light on their origin and spatiotemporal distribution. These rocks may originate from the partial melting of juvenile crustal components with subordinate input of mantle-derived melts.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Geochemistry & Geophysics
A. N. Glukhov, A. B. Kotov, V. V. Priymenko, E. B. Sal'nikova, A. A. Ivanova, Yu. V. Plotkina, A. M. Fedoseenko
Summary: This study analyzed the composition of granitoid rocks in the Kongo magmatic zone and found that they are similar in chemical composition to rocks in the Okhotsk-Chukotka volcanic belt. The granitoids contain moderate amounts of silica and alkalis, elevated alumina, and are enriched in barium, iron group elements, and high field strength elements, while depleted in large-ion lithophile elements, rare earth elements, and yttrium.
Article
Geochemistry & Geophysics
Charles Makoundi, Khin Zaw, Zakaria Endut
Summary: Several orogenic/sediment-hosted gold deposits are found in the Central Belt of Peninsular Malaysia. This study combines U-Pb dating and lead isotope composition analysis, along with gold content observation in ore and pyrite hosted by magmatic rocks, to investigate the age and possible connection between gold mineralization and magmatic intrusion in the area. The results show that S-type magmatic rocks have crystallization ages ranging from 204.1 +/- 4.7 Ma to 223 +/- 3.2 Ma, which fit within the Pb isotopic composition model age of 200-250 Ma. In addition, pyrite trace element mapping reveals zoning patterns of gold and lead, indicating simultaneous occurrence. The approximate model age of gold mineralization is determined to be 200 Ma based on the Pb isotope composition of pyrite cores. Furthermore, the variable gold content in the analyzed magmatic rock-hosted pyrites (up to 793 ppb) suggests a possible magmatic contribution to gold mineralization.
Article
Geosciences, Multidisciplinary
Vojtech Janousek, Yulia V. Erban Kochergina, Alexandre Andronikov, Vladimir K. Kusbach
Summary: The Moldanubian Zone of the Bohemian Massif has been intruded by three Variscan plutonic suites. Their mantle sources evolved and may be related to Andean-type subduction and deep subduction/relamination.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
Hideaki Miyamoto, Takafumi Niihara, Takeshi Kuritani, Peng K. Hong, James M. Dohm, Seiji Sugita
METEORITICS & PLANETARY SCIENCE
(2016)
Review
Geochemistry & Geophysics
Masahiro Kayama, Hiroshi Nagaoka, Takafumi Niihara
Article
Geochemistry & Geophysics
Takafumi Niihara, Hiroshi Kaiden, Keiji Misawa, Toshimori Sekine, Takashi Mikouchi
EARTH AND PLANETARY SCIENCE LETTERS
(2012)
Article
Ecology
Takahiro Hiroi, Hiroshi Kaiden, Keiji Misawa, Takafumi Niihara, Hideyasu Kojima, Sho Sasaki
Article
Ecology
Takafumi Niihara, Naoya Imae, Keiji Misawa, Hideyasu Kojima
Article
Geochemistry & Geophysics
Takafumi Niihara, Sky P. Beard, Timothy D. Swindle, Lillian A. Schaffer, Hideaki Miyamoto, David A. Kring
METEORITICS & PLANETARY SCIENCE
(2019)
Article
Astronomy & Astrophysics
Kosuke Kurosawa, Hidenori Genda, Ryuki Hyodo, Akihiko Yamagishi, Takashi Mikouchi, Takafumi Niihara, Shingo Matsuyama, Kazuhisa Fujita
LIFE SCIENCES IN SPACE RESEARCH
(2019)
Article
Astronomy & Astrophysics
Kazuhisa Fujita, Kosuke Kurosawa, Hidenori Genda, Ryuki Hyodo, Shingo Matsuyama, Akihiko Yamagishi, Takashi Mikouchi, Takafumi Niihara
LIFE SCIENCES IN SPACE RESEARCH
(2019)
Article
Geochemistry & Geophysics
Yuki Saito, Peng K. Hong, Takafumi Niihara, Hideaki Miyamoto, Kenji Fukumizu
METEORITICS & PLANETARY SCIENCE
(2020)
Article
Geosciences, Multidisciplinary
Hideaki Miyamoto, Takafumi Niihara
Summary: With the increasing interest in space resources and asteroid missions, there is a growing demand for simulated asteroid materials. A simplified simulant based on terrestrial observations of the asteroid, using serpentine as the base material, was developed to closely simulate the characteristics of carbonaceous meteorites. This simplified simulant was particularly useful for evaluating initial data from space missions before obtaining actual samples.
NATURAL RESOURCES RESEARCH
(2021)
Article
Geochemistry & Geophysics
Takafumi Niihara, Tatsunori Yokoyama, Tomoko Arai, Keiji Misawa
Summary: The study conducted detailed petrological and mineralogical analyses on an igneous clast in the Northwest Africa (NWA) 1685 (LL4) chondrite, revealing differences from previously reported alkali-rich clasts in LL chondritic breccias. The results suggest that the NWA 1685 clast may have formed during an impact melting and quenching event on the LL-chondrite parent body, and later incorporated into a breccia.
METEORITICS & PLANETARY SCIENCE
(2021)
Article
Geochemistry & Geophysics
Kosuke Kurosawa, Haruka Ono, Takafumi Niihara, Tatsuhiro Sakaiya, Tadashi Kondo, Naotaka Tomioka, Takashi Mikouchi, Hidenori Genda, Takuya Matsuzaki, Masahiro Kayama, Mizuho Koike, Yuji Sano, Masafumi Murayama, Wataru Satake, Takafumi Matsui
Summary: The shock metamorphism of minerals in meteorites provides valuable information about the ancient Solar System. Calcite, a common aqueous alteration mineral in carbonaceous chondrites, is expected to be found in return samples from the asteroids Ryugu and Bennu. In this study, we investigated the shock effects in calcite using impact experiments and found that over half of the calcite grains exhibit undulatory extinction when the peak pressure exceeds 3 GPa. This suggests that the undulatory extinction records plastic deformation in the crystal.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2022)
Article
Geosciences, Multidisciplinary
Haruka Ono, Kosuke Kurosawa, Takafumi Niihara, Takashi Mikouchi, Naotaka Tomioka, Junko Isa, Hiroyuki Kagi, Takuya Matsuzaki, Hiroshi Sakuma, Hidenori Genda, Tatsuhiro Sakaiya, Tadashi Kondo, Masahiro Kayama, Mizuho Koike, Yuji Sano, Masafumi Murayama, Wataru Satake, Takafumi Matsui
Summary: A shock recovery experiment was conducted on a terrestrial basalt at the Chiba Institute of Technology, Japan, which revealed localized melting at lower pressures than previously thought. The results provide a pressure scale for classifying basaltic eucrites, with an estimated 15% of these rocks falling into the shock degree C category.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Christopher Hamann, Kosuke Kurosawa, Haruka Ono, Toshihiro Tada, Falko Langenhorst, Kilian Pollok, Hidenori Genda, Takafumi Niihara, Takaya Okamoto, Takafumi Matsui
Summary: Knowledge of the shock behavior of planetary materials is crucial for understanding shock metamorphism in various geological contexts. This study investigates the effects of friction and plastic deformation on shock metamorphism in granite through shock-recovery experiments and numerical modeling. The results reveal a progressive shock metamorphism in granite that is consistent with existing classification schemes. However, the study also identifies the formation of highly localized melt veins at lower peak pressures than previously thought, and the presence of high-pressure silica polymorph stishovite in quartz grains. These findings contribute to our understanding of impact processes and the formation of melt veins with high-pressure polymorphs in shocked terrestrial impactites or meteorites.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2023)