The Muria-Peninsula is a Quaternary volcano located in the northern Sunda arc. Its activity was controlled under high potassic and very magma series resulting leucite-rich trachyte pyroxene-rich basaltic-andesite. It strato-type that composed of lava, breccia, tuff layers, some dikes have volcanic craters maars varying age composition. study area covering volcanoes Muria, Genuk, Patiayam. This ...

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...

Phonolitic eruptions can erupt either effusively or explosively, and in some cases develop highly energetic events such as caldera-forming eruptions. However, the mechanisms that control the eruptive behaviour of such compositions are not well understood. By combining pre-eruptive data of well studied phonolitic eruptions we show that the explosive-effusive style of the phonolitic magma is cont...

The oldest-known rocks of the eroded Dunedin Volcano (DV), New Zealand, active 16.0–11.0 Ma, were emplaced by penecontemporaneous explosive eruptions and intrusions magmas with a remarkable range compositions, including basanite, alkali basalt, trachyte phonolite. compositional diversity in rapid succession during earliest development volcano signify existence complex magmatic system highly evo...

The eruptive history of Pantelleria has been marked by the eruption nine peralkaline ignimbrites, with inter-ignimbrite episodes from small, local volcanic centres. New whole-rock geochemical data are presented for seven ignimbrites and used published younger units to track compositional changes time. From ∼190 ka, silicic magmatism was dominated comenditic trachyte comendite compositions, evol...

Soil erosion is a problem that affects the landscape at different scales and represents serious challenge for land management soil conservation in both natural forests meadows. The aim of this study was to determine how parent material use affect physical chemical properties area Fruska Gora Mountain. soils were separated into five bedrock types: serpentinite, marl, trachyte, shale, loess two f...

The research area is Bualemo Village, Kwandang District, North Gorontalo Regency. With coordinates 0˚ 47' 10" - 48' 40" Latitude and 122˚ 55' 0" 57' 5" East Longitude with an of about 10 km2. This study aims to determine the petrogenesis andesite rocks tectonic setting in area. method used this a mapping geological conditions site X-ray fluorescence (XRF) geochemical analysis chemical content r...