Chondrules in undifferentiated meteorites are former silicate melt droplets of variable texture and composition. Although widely studied, the chondrule formation mechanisms conditions that explain all properties chondrules yet to be identified. To further constrain processes affected solar nebula on meteorite parent body, we determined situ Si isotope ratios major trace element compositions min...

Dolerites dykes of 4.5 to 25 m wide extend from 200m 1km, crosscut the Guébaké granitoids basement in northern Cameroon along EW N100E directions. Petrographic studies reveal microlitic porphyritic texture classical doleritic ophitic sub-ophitic types. dolerites are mainly composed various proportions skeletal plagioclase and feldspar, clinopyxene, amphibole oxides crystals. ICP-MS ICP-AES ge...

Abstract Late Cenozoic basaltic rocks in Nang Rong Columnar Jointed Basalts southern Khorat Plateau are among the greatest columnar basalts Thailand as famous geoheritage sites. This work aims to characterize and evaluate post-quarrying area by field investigation, petrography, geochemistry, geological engineering. A petrographical study determines these olivine basalts, presenting porphyritic ...

three intrusive granitoid bodies from northwest saveh, central iran, are embedded in volcanic sedimentary rocks of the eocene,forming isolated small outcrops: khalkhab quartz monzodioritic units (sio2: ~52-57 wt %) to the northwest, neshveh granodioriticunits (sio2: ~62-71 wt %) to the northeast, and selijerd granodioritic units (sio2: ~63-69 wt %) to the southeast. the khalkhab unit iscomposed...

Three intrusive granitoid bodies from northwest Saveh, central Iran, are embedded in volcanic sedimentary rocks of the Eocene,forming isolated small outcrops: Khalkhab quartz monzodioritic units (SiO2: ~52-57 wt %) to the northwest, Neshveh granodioriticunits (SiO2: ~62-71 wt %) to the northeast, and Selijerd granodioritic units (SiO2: ~63-69 wt %) to the southeast. The Khalkhab unit iscomposed...

The Razei region in the northwest of Ardabil is considered a part of West Alborz-Azerbaijan. Rocks in this area were created by Eocene volcanic activities. These rocks range from andesite to olivine basalt. The common texture of these rocks is Porphyritic with microlithic matrix. The phenocrysts of these rocks are often clinopyroxene, plagioclase, and olivine. The texture is made of microlithic...