X-RayDiffractionX-Ray Diffraction technique is used to determine unknowncompound, crystallographic structure, strain, preferred orientation, atomicspacing and crystalline grain size. TheseX-rays are produced by a cathode ray tube, filtered to produce monochromaticradiation, collimated to concentrate, and directed toward the sample. Thistechniques satisfies Bragg’s Law (n?=2d sin ?) when the interaction of theincident rays with the sample produces constructive interference with adiffracted ray. There are three main components of X-Ray diffractometer whichis X-Ray tube, a sample holder and X-Ray detector. Cathode ray tube bombardssample with electrons where it will produce X-Ray spectra and as it satisfy theBragg Equation, constructive interference and a peak in intensity will occur.
Then the detector detects and process then the output will be shown on themonitor. Bulk analysis is to know the rock forming mineral and total clayminerals. X-RayDiffraction Bulk Analysis of R9815 Sample A Graph of Intensity vs 2d Angle of R9815 Sample Ausing Copper (Cu) Anode Identified Patterns List: Visible Ref. Code Score Compound Name Displacement °2Th. Scale Factor Chemical Formula * 98-000-9830 38 Albite high 0.
000 0.291 Al1 Na1 O8 Si3 * 98-005-9844 22 Mica 0.000 0.131 H2 Al0.24 Fe3.
76 K1 O12 Si3 * 98-015-6166 28 Chlorite IIb-4 0.000 0.103 H16 Al2.78 Fe0.94 Mg11.06 O36 Si5.22 * 01-089-8936 42 Silicon Oxide 0.
000 0.176 Si O2 * 01-089-5378 33 Iron Magnesium Manganese Calcium Sodium Silicate Hydroxide Fluoride 0.000 0.644 ( Fe3.
112 Mn0.088 Mg1.954 Ca1.814 Na0.018 ) Si7.988 O22.12 ( O H)1.860 F0.
020 * 00-029-0862 29 Magnesium Iron Nickel Aluminum Silicate Hydroxide 0.000 0.106 ( Mg , Ni , Fe , Al )12 Si6 Al2 O20 ( O H )16 Plotof Identified Phases: Identify phases by their respective reference codesin comparison to the overall peak list. Discussion:The elements present in sample A is albite, mica,chlorite, silicon oxide, iron, magnesium, manganese, calcium, sodium, silicate,hydroxide, fluoride, silicate and aluminum. Chlorite is a critical mineral which mighthave undergone chloritization from mica which is caused by metamorphism. Thepresence of albite, sodium and hydroxide suggest that this compound does notoriginate from basic igneous rock.
This rock could be from deep cores ofsedimentary rock basin due to high presence of albite and chlorite. Theformation environment is at convergent plate boundary and subduction zones. X-RayDiffraction Bulk Analysis of R9815 Sample B IdentifiedPatterns List: Visible Ref. Code Score Compound Name Displacement °2Th.
Scale Factor Chemical Formula * 98-003-4870 32 Albite low 0.000 0.291 Al1 Na1 O8 Si3 * 01-089-8936 43 Silicon Oxide 0.000 0.654 Si O2 * 98-005-9844 10 Mica 0.000 0.085 H2 Al0.
24 Fe3.76 K1 O12 Si3 * 00-001-0705 22 Potassium Aluminum Silicate 0.000 0.
346 K Al Si3 O8 * 01-070-2129 9 Calcium Aluminum Silicate 0.000 0.047 Ca Al Al Si O6 Plot of Identified Phases: Discussion:The elements detected in sample B is albite, siliconoxide, mica, potassium, aluminum, silicate, and calcium. The presence ofsilicon oxide, silicates and potassium shows that it might be from felsic igneousrocks. These rocks are primarily located at convergent zones. The common felsicrock is granite, rhyolite and dacite. This evidence is supported by the absenceof hydroxide compound that make a rock from sedimentary origins.
Igneous rockforms at high temperature so there is no hydroxide or other hydrous compounds.
