Marapi in Sumatra is characterized by frequent short-lived explosions and small eruptions (Volcanic Explosivity Index 1–2) the past 250 years, volcano has erupted >60 times. Recent volcanic bombs presence of broadband seismic stations lead us to reconstruct plumbing system through an interdisciplinary study. A petrologic study summit uses pyroxene, plagioclase glass compositions obtain pressure...

The mineralogy of an unusual calc-silicate nodule brought to the surfaoe by the 1902 eruption of La Soufriere volcano on St. Vincent (Lesser Antilles arc) is described. It consists of the crystalloblastic mineral assemblage fassaite pyroxene + grandite garnet + wollastonite + anorthite t calcite. The pyroxene is more aluminous (Al2O3 : 19.66 weight percent) than any previously described from te...

A quartz-pyroxene rock interpreted as a banded iron formation (BIF) from the island of Akilia, southwest Greenland, contains (13)C-depleted graphite that has been claimed as evidence for the oldest (>3850 million years ago) life on Earth. Field relationships on Akilia document multiple intense deformation events that have resulted in parallel transposition of Early Archean rocks and significant...

In order to better understand magma evolution at depth in the Earth, partition coefficients between low-Ca pyroxene and melt have been experimentally determined at 15 and 20 kbar. Results indicate that partitioning of Sc, Yb, and Ca is little afected by pressure but Al partitioning increases significantly. We conclude that the unique dependence of Al partitioning on pressure results from the st...

This is the final report on the nomenclature of pyroxenes by the Subcommittee on Pyroxenes established by the Commission on New Minerals and Mineral Names of the International Mineralogical Association. The recommendations of the Subcommittee as put forward in this report have been formally accepted by the Commission. Accepted and widely used names have been chemically defined, by combining new...

Although pyroxene has been detected remotely across the Solar System, limited information is available from infrared remote sensing about Mg-Fe composition of pyroxene, and distinguishing between augite (20 < CaSiO3 45) diopside-hedenbergite (CaSiO3 > remains challenging. The characteristics in intermediate range (4–8 μm), meanwhile, have not documented. Using reflectance spectra 72 samples ran...

Introduction. The Mócs meteorite is L5-type chondrite, which fell in 1882, Kolozs county. The meteorite major modal composition are: olivine, pyroxene, plagioclase feldspars, and opaque minerals. The meteorite is highly fractured, and shock induced veins are also discernible. The fractures are filled by iron rich material. The sample contains shock-metamorphic effects (especially in olivine), s...