Web4. Interpret igneous rock textures and mineral assemblages in thin sections and relate thin section observations to inferences drawn from phase diagrams; 5. Critically evaluate the evidence for the petrogenesis of igneous rocks in a variety of plate tectonic settings. ASSESSMENT: Continuous Assessment: 20% (Assessment of practical notebook) WebFigure 2: X-ray map for Fe of polished thin section of NWA2737 showing cumulate texture (figure 2a from Beck et al. 2006). alteration (Misawa et al. 2005). Carbonate has been reported in veins. NWA2737 originally crystallized ~ 1.4 b.y., but was severely shocked ~ 170 m.y. ago. It has a cosmic ray exposure age of about 10 m.y. and a terrestrial ...

Thin section photomicrographs of cumulate nodules from

WebRelict igneous textures. Igneous textures in metamorphic rocks are relatively common, only requiring that deformation has been limited enough to allow them to survive. These are … WebCumulate terminology is appropriate for use when describing cumulate rocks. In intrusions which have a uniform composition and minimal textural and mineralogical layering or … optic nerve biopsy

Is this thin section volcanic or plutonic? ResearchGate

WebFeldspars may be distinguished between each other by a number of properties, but the one most likely to be effective in pottery thin-sections is the twinning: A feldspar with … WebMar 1, 2008 · Sspinifex ADK (Samples 166-1, 229-2, 229-3, B12 and B14), C-cumulate ADK (samples 229-5 and B15). Normalizing values after Sun and McDonough (1989). Primitive mantle-normalized trace-element ... WebMay 31, 2024 · Three mare basalt samples and one volcanic glass sample are included in this set of petrographic thin sections. The two Apollo 12 samples are low-Ti basalts. Although sample 12002 may represent a … optic nerve blind spot