Few studies have compared the suitability of different artificial reef construction materials in terms of their efficacy in acquiring diverse faunal assemblages. We compared the fishes associated with 12 co-located reefs constructed of limestone quarry boulders, concrete-gravel aggregate, or concrete-tire aggregate (four of each substrate) in 7 m of water, 200 m offshore Miami Beach, Florida, U...

The production rate of cosmogenic He in apatite, zircon, kyanite and garnet was obtained by cross-calibration against Be in co-existing quartz in glacial moraine boulders from the Nepalese Himalaya. The boulders have Be ages between 6 and 16 kyr and span elevations from 3200 to 4800 m. In all of these minerals He correlates with Be and is dominantly cosmogenic in origin. After modest correction...

Many small boulders with reflectance values higher than 1.5 times the average have been found on near-Earth asteroid 162173 Ryugu. Based their visible wavelength spectral differences, Tatsumi et al. (2021) defined two bright boulder classes: C-type and S-type. These classifications of different size distributions trends. In this study, we measured spectra 79 investigated detailed properties. An...

Wolfram mineralization in the area of Vau village (Dong Giang district, Quang Nam province) is distributed along small stream together with other sulfide mineralizations form to large boulders. Ore minerals are mainly sheelite, pyrhotite, arsenopyrite a little chalcopyrite and pyrite. The ore stockwork type gray, light gray metamorphic sedimentary rocks quartz - mica composition alternated feld...

The study presents hydrodynamic mechanism of boulder transportation along the rocky coastal margins with a case from eastern flank Arabian Sea. Limestone blocks ranging in size small (1.3, 0.95, 0.35) m to large (2.9, 1.68, 0.5)m scattered over platform were considered for approximation wave energy. boulders prominent imbrications indicative flow direction used assess minimum velocity initiate ...