The origin of diamonds from Serra do Espinhaço in Diamantina region (State of Minas Gerais) and in Chapada Diamantina, Lençóis region (State of Bahia) remains uncertain, even taking into account the ample research carried out during the last decades. The lack of typical satellite minerals in both districts makes a kimberlitic source for these diamonds uncertain. In mid 18th century the occurren...

This article discloses a rare and outstanding type of Mn-rich black-blue patina found on mural painting granite ashlars located in the church Sta. Marinha, north Portugal, conjectures phenomenon associated to appearance such patinas different surface materials. Mn-patina reported their origin is probably assigned manganese leaching from building materials (i.e., phyllites). Stained examined by ...

Geological mapping was carried out in the outer part of Lesser Himalaya Barahakshetra – Tribeni area east Nepal along Arun River valley. A revised and updated tectono-lithostratigraphic scheme with detailed description each unit their comparison central west has been presented this work. The is divided into three tectonic units named as Chimra Thrust Sheet, Dharapani Sheet Paraautochthon from n...

The 10.5 km diameter Bosumtwi crater in Ghana, West Africa, is the most likely source crater for the Ivory Coast tektites, as the tektites and the crater have the same age (1.07 Ma), and there are close similarities between the isotopic and chemical compositions of the tektites and crater rocks. The crater is excavated in 2.1–2.2 Ga old metasediments and metavolcanics of the Birimian Supergroup...

We have analyzed the geoelectric response produced by three cavities cut into different geological substrata of granite, phyllite, and sandstone that had previously been characterized by direct methods. We also examined a mining void excavated in granite. In each case, we applied three different geoelectric arrays (Wenner-Schlumberger, Wenner and dipole-dipole) and several inter-electrode spaci...

This paper presents an approach to analyzing the reduction intensity of handaxes with the aid of 3D scanning technology. Two quantitative reduction indices, the Scar Density Index (SDI) and the Flaked Area Index (FAI), are applied to handaxes from the third terrace of the Danjiangkou Reservoir Region (DRR), central China, dated to the Middle Pleistocene. The results show that most of the DRR ha...

Completely weathered phyllite (CWP) soil is a kind of special with high swell potential, while red clay shrinkage. This means that these two kinds soils are usually not suitable for direct use as subgrade fill. To reduce the index CWP and shrinkage at same time, it was proposed to blend improve their basic characteristics. A series tests dry-wet cycle blended have been carried out varying blend...

A detail field and microscopic characteristics of Malayer Plutonic Rocks (162-187Ma), west of Iran, are discussed in details to evaluate relationships between deformation and pluton emplacement. The studied rocks were injected into the slate, phyllite and schists of so called "Hamadan phyllites and slates" in the Sanandaj-Sirjan zone. Studies have shown that there is a continuity from magmatic ...

The demands in building infrastructures many countries require a huge amount of concrete to be used. As such, the construction industry increased its requirement for aggregates and cement. However, quarrying dredging river harm environment. Also, cement production contributes carbon dioxide emissions. primary focus this study is evaluate application Mangima stone (phyllite schist) eggshell powd...

available online at http://meteoritics.org Drill core LB-08A, Bosumtwi impact structure, Ghana: Petrographic and shock metamorphic studies of material from the central uplift Ludovic FERRIÈRE1*, Christian KOEBERL1, and Wolf Uwe REIMOLD2 1Department of Geological Sciences, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria 2Mineralogy, Museum of Natural History, Humboldt University, ...