Abstract As one of the most active volcanoes with significant eruptive impact in Indonesia, Raung volcano shows a trace pre-historical devastating eruption as evidenced by morphology caldera at its summit. Our fieldwork revealed occurrence four pyroclastic fall deposits, two lava flows, ignimbrite, block and ash flow deposit, lahar products eruption. There is evidence Plinian phase represented ...

Magmatic processes have usually been identified and evaluated using qualitative or semiquantitative geochemical or isotopic tools based on a restricted number of variables. However, a more complete and quantitative view could be reached applying multivariate analysis, mass balance techniques, and statistical tests. As an example, in this work a statistical and quantitative scheme is applied to ...

Karapınar-Karacadağ Volcanic Rocks (KKVR) have very complex magmatic history and outcropped the southwestern part of Cappadocia Province (Central Anatolia). Here we present petrography whole-rock chemistry enclave-bearing rocks to constrain their source evolution history. These petrographic observation geochemical data reveal that enclaves in volcanic are magma mixing/mingling (MME), segregatio...

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 ...

The timescale of the modification stage basin-sized impact structures is not well understood. Owing to ca. 10 km erosion since its formation, Vredefort structure, South Africa, an ideal testing ground for deciphering post-impact modification. Here, we present geophysical and geochemical evidence from Granophyre Dikes, which were derived - now eroded melt sheet. dikes have been studied mostly in...

The variations in the chemical composition and micro-texture of a mineral from core to rim allow sequencing formation magma chamber processes interpretation which texture might have been formed by process. In this study, textural zoning plagioclases, are significant recorder processes, some enclave-containing andesite (calc-alkaline) basalts Karapınar Karacadağ Volcanic Complex, were examined t...

Crater Lake was surveyed nearly to its shoreline by high-resolution multibeam echo sounding in order to define its geologic history and provide an accurate base map for research and monitoring surveys. The bathymetry and acoustic backscatter reveal the character of landforms and lead to a chronology for the concurrent filling of the lake and volcanism within the ca. 7700 calibrated yr B.P. cald...