... the leaching amount and trend of heavy metals from hydrothermally altered excavated rocks in volcanic field. japan government mineral upstream oil & gas rock type geologist geological subdiscipline reservoir characterization asia government concentration structural geology core analysis...

... in this study revealed that there are springs with various flow systems in the Aso caldera. geology geological subdiscipline characteristic japan government concentration tracer geologist water management caldera precipitation volcanology asia government groundwater recharge elevation...

... Abstract Several tunnels are constructed in the central Hokkaido, Japan. However, some areas have been hydrothermally altered, so the excavated rocks in these areas contain a significant amount of arsenic (As). When we take countermeasures against the rocks, the maximum leaching concentration...

... volcanic ash stratum as the key bed, were marine sediments from the late Pliocene to the middle Pleistocene. The concentrations of sulfur and some heavy metal elements in these were related to sedimentation depth. The concentrations of arsenic in leachate and of arsenic and sulfur in rock samples were...

... a diameter of about 20 cm and are often overlain in the upper part of the crack zone. In addition, rindlet-covered corestone 3 mm to 3 cm wide is observed around the fresh andesite zone. Na and Ca completely disappear from rindlet. Inversely, Ti and Zr are clearly concentrated in rindlet. These elements...

... water and simulated seawater were used, the permeability more decreased in the room-temperature condition. When the confining pressure and fracture surface roughness were different, no clear difference was observed in the permeability change. Moreover, it was confirmed that the elemental concentration...

... g volcanic ashes mixed with 100 ml of pure water. As a result, sulfur content of the volcanic ashes ranges from 0.00 to 7.64 wt.%, and pH and total ion equivalent concentration of the suspension are 4 - 6.5 and 0.1 - 100 meq/L, respectively. We have revealed that the volcanic ashes with higher...

... of modeling the collapse of macroporous materials in a discrete way. local axis concentration grain size distribution axis dip direction macroporous material global axis consolidated triaxial test loading numerical macroporous material modeling dimension boundary displacement particle...