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Sanematsu K.,Institute for Geo Resources and Environment | Ishihara S.,Geological Survey of Japan
Resource Geology | Year: 2011

40Ar/39Ar dating was conducted on the Da Lien granite related to greisen-skarn type polymetallic (W-CaF2-Cu-Bi-Au) mineralization in Nui Phao, northern part of Vietnam in the South China Plate. Biotite and muscovite separates from the biotite-muscovite granite and greisenized granite indicate four plateau ages: 82.2 ± 0.4Ma, 82.8 ± 0.3Ma, 81.5 ± 0.3Ma and 82.5 ± 0.4Ma. The plateau ages were not significantly influenced by excess 40Ar in dated minerals or by loss of radiogenic 40Ar due to hydrothermal activities. The results indicate that solidification of granite related to the polymetallic mineralization occurred in the Late Cretaceous between 82.8Ma and 81.5Ma. © 2011 The Authors. Resource Geology © 2011 The Society of Resource Geology. Source


Mori C.,University of Tokyo | Sato T.,University of Tokyo | Kano Y.,University of Tokyo | Kano Y.,Institute for Geo Resources and Environment | Aleynik D.,Scottish Association for Marine Science
Energy Procedia | Year: 2013

To quantify the risk and impact of CO2 seepage to the marine ecosystem, the Quantifying and Monitoring Potential Ecosystem Impacts of Geological Carbon Storage project is now undergoing in a bay in Scotland. In advance of the field experiment of this project, we conducted the numerical simulation of CO2 seepage. From this numerical study, we predicted how CO2 behave in the bay and how the condition of the sea changes. Source


Sanematsu K.,Institute for Geo Resources and Environment
AIST Today (International Edition) | Year: 2010

Rare earth elements (REE) are considered to be seventeen elements consisting of lanthanoids, yttrium, and scandium. Deposits that supply rare earth resources can be divided into two categories igneous deposits formed by ignoeus rocks or associated hydrothermal activity and weathering deposits created from weathered rocks. Weathering deposits include laterite deposits, ion-adsorption type deposits, and placer deposits. The ore minerals contaning REEs consists of carbonates, phosphates, oxides and ion-adsorption clays. With ion-adsorption clays containing kaolinite and other materials as REE are electrically adsorbed onto the mineral surfaces, they can be recovered by ion exchange using a mild acid without decomposing the minerals themselves. Identification of heavy rare earth materials (HREE) deposits and of REE minerals are two of the challenges facing research on REE deposits. Source


Tosha T.,Institute for Geo Resources and Environment
AIST Today (International Edition) | Year: 2014

The 'Renewable Energy Research Center' which focuses on research and development of solar and wind power generation, energy storage and transport, and system integration technology, as well as geothermal and shallow geothermal energies, was also established under the research institute. When GSHIP systems are used in Japan, the efficiently of heat exchange under the ground clearly depends on the groundwater flow. The research center will be conducting groundwater surveys to create potential maps for the GSHP system for the plains and basins of the Tohoku district, identifying appropriate locations for applications of GSHP systems, and formulating design guidelines for borehole heat exchangers. This will be done through partnerships with universities, the Fukushima Prefecture Hi-tech Plaza, and local companies. Source


Tosha T.,Institute for Geo Resources and Environment | Sakaguchi K.,Renewable Energy Research Center
AIST Today (International Edition) | Year: 2014

The impact of large-scale developments like those of geothermal power plants on hot springs, is ongoing cause for concern. The use of heat pumps allows heating and cooling in areas where it is difficult to use ground heat sources with previous technology. In the case of photovoltaic power generation, the amount of power that can be generated at a particular location can be calculated approximately by measuring the solar insolation and daylight hours. Using the 'Geothermal Potential Map in Japan' published by AIST, it is possible to evaluate geothermal resources. It is estimated that if all the geothermal reservoirs of 150°C or above throughout Japan were developed without restrictions. AIST is currently engaged in research aimed at creating an improved geothermal resource map. Source

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