scholarly journals Geochemistry of caldera‐forming and resurgent magmas in the Pliocene Hiwada caldera, NE Japan: an example of a monotonous intermediate system

Island Arc ◽  
2021 ◽  
Author(s):  
Takahiro Yamamoto
Keyword(s):  
Ne Japan ◽  
Intermediate System

Architecture and chemostratigraphy of Late Jurassic shallow marine carbonates in NE Japan, western Paleo-Pacific

2009 ◽  
Vol 214 (1-4) ◽  
pp. 49-61 ◽  
Author(s):  
Yoshihiro Kakizaki ◽  
Akihiro Kano
Keyword(s):  
Late Jurassic ◽  
Shallow Marine ◽  
Marine Carbonates ◽  
Ne Japan

Fault reactivation and active tectonics on the fore-arc side of the back-arc rift system, NE Japan

2006 ◽  
Vol 28 (11) ◽  
pp. 2011-2022 ◽  
Author(s):  
Naoko Kato ◽  
Hiroshi Sato ◽  
Norihito Umino
Keyword(s):  
Active Tectonics ◽  
Fault Reactivation ◽  
Rift System ◽  
Back Arc ◽  
Ne Japan

Unique Origin of Skarn at the Ohori Base Metal Deposit, Yamagata Prefecture, NE Japan: C, O and S Isotopic Study

2013 ◽  
Vol 63 (4) ◽  
pp. 384-393 ◽  
Author(s):  
Yu Yokoro ◽  
Takahiro Hanamuro ◽  
Kazuo Nakashima
Keyword(s):  
Base Metal ◽  
Base Metal Deposit ◽  
Isotopic Study ◽  
Metal Deposit ◽  
Ne Japan

scholarly journals Chemical composition of groundwaters in the Hornsund region, southern Spitsbergen

2012 ◽  
Vol 44 (1) ◽  
pp. 117-130 ◽  
Author(s):  
Tomasz Olichwer ◽  
Robert Tarka ◽  
Magdalena Modelska
Keyword(s):  
Chemical Composition ◽  
Ion Exchange ◽  
Shallow Groundwater ◽  
Mineralogical Composition ◽  
Deep Groundwater ◽  
Exchange Processes ◽  
Groundwater Circulation ◽  
Initial Chemical Composition ◽  
The University ◽  
Intermediate System

Chemical composition of groundwaters was investigated in the region of the Hornsund fjord (southern Spitsbergen). The investigations were conducted during polar expeditions organized by the University of Wroclaw in two summer seasons of 2003 and 2006. Three zones of groundwater circulation: suprapermafrost, intrapermafrost and subpermafrost, were identified in areas of perennial permafrost in the region of Hornsund. The zone of shallow circulation occurs in non-glaciated (suprapermafrost) and subglacial areas. In this zone, the chemical composition of groundwater originates from initial chemical composition of precipitation, mineralogical composition of bedrock, oxidation of sulphides and dissolution of carbonates. The intermediate system of circulation is connected with water flow inside and below perennial permafrost (intrapermafrost and subpermafrost). In this zone, the chemical composition of groundwater is mainly controlled by dissolution of carbonates, ion exchange processes involving Ca2+ substitution by Na+, and oxidation of sulphides under oxygen-depleted conditions. The subpermafrost zone (deep groundwater circulation) occurs in deep-tectonic fractures, which are likely conduits for the descent of shallow groundwater to deeper depths. In this zone, the groundwater shows lower mineralization comparing to intrapermafrost zone and has a multi-ion nature Cl–HCO3–Na-Ca–Mg.

scholarly journals Eruptive history of Nasu-Chausudake volcano, NE Japan, based on tephrostratigraphy.

1997 ◽  
Vol 103 (7) ◽  
pp. 676-691 ◽  
Author(s):  
Takahiro Yamamoto
Keyword(s):  
Eruptive History ◽  
History Of ◽  
Ne Japan

scholarly journals Radiometric age of a newly recognized Quaternary volcano: Naramata caldera, NE Japan.

2014 ◽  
Vol 65 (9-10) ◽  
pp. 113-116
Author(s):  
Takahiro Yamamoto
Keyword(s):  
Quaternary Volcano ◽  
Ne Japan
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