Nazrul I. Khandaker

Study of volcanic sediments by microbeam-PIXE technique

Single mineral grains in a suite of Cretaceous (85-90 Ma) volcanic sedimentary rocks were analyzed using the microbeam-PIXE technique to understand fundamental geological processes responsible for micro-scale variation in elemental composition across mineral zones, twinning, cleavage planes, fractures and grain boundaries. Distributions of major and trace elements show distinct geochemical features indicative of a specific geological setting and a subsequent diagenetic process in these volcanic sediments. Examples of mineral zoning, microstructures of variable chemistry and post-depositional fluid flow are discussed using the data on feldspar group of minerals.

EXPERIENTIAL LEARNING OPPORTUNITIES THROUGH NASA STEM CONTENT ALLOWS GREATER GRASS ROOT-LEVEL UNDERSTANDING OF THE PRESENT DAY’S EXTREME CLIMATE CHANGE SCENARIO

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Microanalytical investigations of gold-bearing rocks from the An Najadi region in Saudi Arabia

Abstract The Proton Induced X-ray Emission technique with a scanning microbeam (micro-PIXE) and Scanning Electron Microscopy (SEM) were employed to study gold-bearing rocks from the An Najadi and adjacent regions situated within the exposed northeastern part of the Arabian Shield. These microanalytical investigations, together with routine petrological and ore microscopic studies, demonstrated the presence of important partitioning of major minerals and trace elements in several samples. These measurements also revealed microstructural features including brecciation within quartz grains and metal concentrations within these fracture-controlled micro-conduits. Results showed promise in terms of using distinctive geochemical signatures for ore body recognition. Of particular interest to this study is the presence of an identifiable geochemical trend pertaining to As, Ti, Zn, Cu, Fe and Au. Overall geochemical and petrological data indicate an epithermal mineralization phenomenon for the metal deposits in the An Najadi regions. Mineralization not only postdated brecciation but also followed the regional structural grain of this area.