Shihuiyao Rb–Nb–Ta-rich granites from the Late Jurassic period are newly discovered rare-metal-bearing found in southern Great Xing’an Range, NE China. Further research of these may contribute to better understanding petrogenesis rare-metal and their associated mineralization mechanisms. The high-silica (SiO2 = 73.66–77.08 wt%), alkali-rich (K2O + Na2O 8.18–9.49 wt%) weakly mildly peraluminous ...

ultramafic rocks are essentially constituted by silicates of magnesium: forsterite, and/or diopside-enstatite; who’s the most common hydrothermal alteration are the serpentinization. to bou azzer, the serpentinisation affected almost all of the ultrabasic rocks. among the phenomena bound to the serpentinisation observed on the ground, we distinguish the magnesium deposits (carbonated serpentini...

Dispersif zeminler, dolgu barajların çekirdek yapısında kullanıldığında erozyon hassasiyetlerinin çok yüksek olması nedeniyle içsel erozyona neden olarak bu tür göçmesine olmaktadırlar. Bu zeminlerin tasarım aşamasında belirlenerek inşaatında kullanılmaması gerekmektedir. zeminler; fiziksel (Dağılma deneyi, çifte hidrometre deneyi ve iğne deliği deneyi) kimyasal (Boşluk sıvısının içeriği) deney...

Abstract. Although analyses of tephra-derived glass shards have been undertaken in New Zealand for nearly four decades (pioneered by Paul Froggatt), our study is the first to systematically develop a formal, comprehensive, open-access reference dataset glass-shard compositions tephras. These data will provide an important tool future studies identify and correlate tephra deposits associated pet...