Eruptive activity at Turrialba Volcano (Costa Rica) has escalated significantly since 2014, causing airport and school closures in the capital city of San José. Whether or not new magma is involved in the current unrest seems probable but remains a matter of debate as ash deposits are dominated by hydrothermal material. Here we use high-frequency gas monitoring to track the behavior of the volc...

EDITORIAL article Front. Earth Sci., 10 July 2023Sec. Petrology Volume 11 - 2023 | https://doi.org/10.3389/feart.2023.1247797

栃木県，高原火山の塩原カルデラ形成噴火について編年とマグマ系を検討した．塩原カルデラ噴出物は下位からSo-KT（KT），So-TN（TN）およびSo-OT（OT）の3つの火砕流堆積物に分けられる．KTの直下とKTとTNの間の火山灰土壌中には，黒雲母の濃集で認識される外来テフラが認められる．火山ガラスや磁鉄鉱の化学組成およびジルコンのU-Pb年代により，下位および上位の外来テフラはそれぞれ貝塩上宝テフラ（KMT：620 ka）と大町APmテフラ群（410～337 ka）に対比できる．軽石の岩石学的特徴から，いずれの火砕流堆積物にもマグマ混合の証拠が認められ，それぞれ異なる珪長質端成分マグマに由来することが分かる．特にKTとTNの間には約20万年以上の時間間隙があり，この間に珪長質端成分マグマの起源である下部地殻の諸条件（起源物質や溶融条件）が大きく変化したと考えられる．

Citation: Caricchi L, Simpson G and Schaltegger U (2016) Estimates of Volume and Magma Input in Crustal Magmatic Systems from Zircon Geochronology: The Effect of Modeling Assumptions and System Variables. Front. Earth Sci. 4:48. doi: 10.3389/feart.2016.00048 Estimates of Volume and Magma Input in Crustal Magmatic Systems from Zircon Geochronology: The Effect of Modeling Assumptions and System V...

Millisecond fluctuations in length of day over multiple decades may induce fluctuations in flow of magma to the surface. We propose that the same magmatic volatiles that greatly amplify volcanic eruptions can also amplify these minute magmatic fluctuations sufficiently to be detected in sea surface temperature.

[1] Tharsis province is a major center of Martian volcanic activity characterized by large gravity and topography anomalies. The origin of Tharsis is debated. One hypothesis is that the province was produced by melting associated with a mantle plume from the coremantle boundary. An alternative hypothesis is that Tharsis formed by a plume associated with an impact. Recent studies have shown that...

jebale barez plutonic complex is composed of granitoid intrusive bodyes and is located in the east - north east jiroft and  southeastern province of kerman on the lengths of the 57° 45' east to 58° 00' and northern latitudes  28° 30' to 29° 00'. plutonic complex composed of granodiorite, quartzdiorite, monzogranite and porphyritic granite. the microstructures observed in thi...

Introduction: The GRAIL (Gravity Recovery and Interior Laboratory [1]) mission has enabled unprecedented views of the lunar crust and interior structure. Indeed, the data solutions now resolve gravity anomalies arising from lateral heterogeneities within the crust globally at scales < 10 km[2,3]. Intrusive magmatic features such as dikes and sills are predicted to be prevalent within the lunar ...