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Lab 4 (1) - fl/sp PETROGRAPHY OF SANDSTON ES GEO 4420...

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Unformatted text preview: fl/sp PETROGRAPHY OF SANDSTON ES GEO]. 4420 - Sed/Strat [ab #4 In this lab, you will examine thin sections of selected sands and sandstones with the petrographic microscope. Coarser terrigenous sediments (i.e. gravels and conglomerates) are best studied with a hand lens, and finer sediments (i.e. clays and shales) are best studied with techniques such as x-ray diffractometry. - For parts 1 through 4, simply take notes, make sketches, or otherwise assure yourself that you can identify various quartz types, feldSpars, rock fragments and cements in thin section. Hand in your notes. ~ For parts 5, 6, and 7 you are asked to respond to several questions with written answers. Hand in your work. ............................................................................................................................................................ 1. QUARTZ TYPES A Evamina rho hiir‘n ant lnkn‘lnr‘ ”Hart? hrnac Tim-mm “Iv-e-‘nn nwnuirln nlrnmn‘nn “F. plutomc quartz metamorphic quartz vein quartz volcanic quartz reworked sedimentary quartz quartzite chert chalcedony 1. 138—2 (modern eolian dune sand) - mostly plutonic quartz and some metamorphic quartz — note difference between monocrystalline and polycrystalline grains 2. RG-l (modern sand from alluvial fan draining Precambrian schist) - mostly metamorphic quartz - note also muscovite 3. (1-3 (quartz from hydrothermal veins in Precambrian granite) — vein quartz - note abundant fluid—filled vacuoles 4. T-NM—6 (Bandelier Tuff) or H-NM-Z (modern sand eroded from Band. Tuff) - volcanic quartz — note also sanidine and volcanic rock fragments in H-NM-Z 5. BR—l (modern sand from Double Mountain Fork of Brazos River) - mostly reworked sedimentary quartz - derived from weathering of Triassic and Late Tertiary sediments — look for iron oxide/clay coatings on grains ("cutans") and reworked quartz overgrowths 6. (1—5 (quartzite in Precambrian metasedimentary rocks) - quartzite (metamorphic quartz) 7. D-TX-l (Dev. Caballos Novaculite) - chert = equant microcrystalline quartz ...
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