プレート収束域の物質科学研究拠点

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The paper (url) includes Associate Professor Miyahara, Senior Researcher Tomioka, JAMSTEC/Kochi Core (Visiting Professor at Hiroshima University), and Professor Yabuta as co-authors.

In this study, the petrologic and mineralogical characteristics and alteration processes of nakhlites NWA 6148 and NWA 10153 were investigated, and both were found to be composed primarily of pyroxene, olivine, and mesostasis; NWA 6148 corresponds to a lava unit crystallized about 1.3 billion years ago, while the location of NWA 10153 is unknown, but it records two alteration environments: a reducing, neutral to alkaline environment and an oxidizing, acidic environment. It is suggested that these rapid changes in alteration environments may have been caused by impact events (Published paper url).

Titanium dioxide nanoparticles negatively impact marine ecosystems and public health, and although Ammonia veneta possesses a detoxification mechanism to uptake and expel titanium dioxide nanoparticles, this function breaks down at concentrations exceeding 5 ppm, leading to inhibited growth. Given that current coastal environments exhibit titanium dioxide nanoparticle accumulation far exceeding the detoxification capacity, it is crucial to investigate the toxic mechanisms to prevent further disruption of marine ecosystems (Published paper url).

Ryugu particles contain noble gases derived from solar wind and P1 with high concentrations, and one of the newly analyzed samples shows a xenon concentration approximately 10 times higher, resembling P1 but with distinct isotopic fractionation and a lower 36Ar/132Xe ratio. This newly identified component (P7) provides insights into the fractionation processes that formed planetary components (Published paper url).

The parent bodies of C-type asteroids may have delivered volatile and organic compounds to terrestrial planets, and samples returned by Hayabusa2 from Ryugu contain hydrated ammonium–magnesium–phosphorus-rich grains, believed to originate from the outer Solar System, which could have played a critical role in the chemical evolution of organic matter on early Earth by releasing phosphorus and nitrogen species (Published paper url).

Feather Features (FFs) in quartz, consisting of planar fractures (PF) and fine lamellae (FFL), were found to form over a wide pressure range of 2–18 GPa through shock recovery experiments, and they can be classified into at least three types (I–III), suggesting their potential as a shock pressure barometer for quartz-bearing rocks (Published paper url).

最新情報

2023年10月22日

[イベント] 2023年11月4日(土)13:00-16:30 広島大学理学部 E 棟 209 号室(及び Zoom 併用)で第12回ホームカミングシンポジウム&第10回HiPeRシンポジウムが開催されます。

2022年10月30日

山口和貴さん(M2)が「広島大学創発的次世代研究者育成・支援プログラム」に採択されました。

2022年08月10日

河上洋輝さん(M2)が「広島大学創発的次世代研究者育成・支援プログラム」に採択されました。

2020年11月24日

2021年度JSPS二国間交流事業(日露)(代表者:井上徹教授)が採択される。

2020年11月05日

【特別セミナーが開催されました】2020年11月11日(水) 講師:福士 圭介氏(金沢大学環日本海域環境研究センター)

2020年10月17日

【特別セミナーが開催されました】2020年10月16日(金)講師:坂口 有人氏(山口大学大学院創成科学研究科)

2020年01月14日

【特別セミナーが開催されました】2020年1月10日(金)講師:Tom Mitchell氏(University College London)

2018年10月11日

【特別セミナーが開催されました】2018年10月22日(月) 講師:芦 寿 一 郎氏(東京大学大気海洋研究所)   

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