The Tsushima Lapilli Tuff, the thickest tuff in Taishu Group on Island, underwent a thermal event after deposition, and has not previously yielded reliable age because various ages have been reported. This study clarifies eruption history of Tuff based fission-track (FT) U–Pb dating zircon grains using laser ablation inductively coupled plasma mass spectrometry (ICP-LA-MS) evaluates submarine v...

To determine the metamorphic ages of accretionary complexes in Northern Chichibu Belt SW Japan, K–Ar dating was conducted using weakly metamorphosed sedimentary rocks collected from Kanto Mountains, Central Japan. Whole-rock were obtained for chert and red shale samples, mineral fine-grained illite with a grain size less than 4 μm chert, shale, mudstone, acidic tuff, basic tuff. The presented l...

Introduction: The National Research Council Decadal Study on Terrestrial Analogs to Mars recommended the Bishop Tuff, exposed in the Volcanic Tableland, Bishop, California (Fig. 1), as an analog [1] because some Martian volcanoes and the Stealth region of southwestern Tharsis are thought to be composed of pyroclastic deposits [2–4]. Recent data from the Spirit rover also suggest that the Columb...

Terahertz (THz) time-domain spectroscopy probes the optical properties of naturally occurring solid aggregates of minerals, or stones, in the THz frequency range. Refractive index and extinction coefficient measurement reveals that most natural stones, including mudstone, sandstone, granite, tuff, gneiss, diorite, slate, marble, and dolomite, are fairly transparent for THz frequency waves. Dolo...