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Dia_363-0853
DE: Hand-specimen photographs of botryoidal aragonite, Photomicrographs of botryoidal aragonite
EN: Hand-specimen photographs of botryoidal aragonite, Photomicrographs of botryoidal aragonite.
| Record Name | Dia_363-0853 |
|---|---|
| Photographer | Unbekannt |
| Dating | 1965-2010 |
| Caption | Title Register of the original file: Carbonate rocks: marine cements. Fig. 2 - Hand-specimen photographs of botryoidal aragonite. A) Large mass of cavity-filling cement made up of numerous fans of botryoidal aragonite up to 36mm long. Numbers 1 and 2 indicate two of the individual botryoids sampled for radiocarbon and stable-isotope analyses. Sample from Belize foreslope. Depth 143m. B) Close-up of sample site 1 shown in Figure 2A. Fan of botryoidal aragonite is 36mm longfrom top to bottom. Sample sites for radiocarbon dating (X) are centered at 2mm, 17mm and 34mm from base of botryoid. Small holes are from stable-isotope sampling transect. Fig. 3 - Photomicrographs of botryoidal aragonite. A) Thin-section photomicrograph (crossed nicols) showing compound growth of pore-filling botryoidal aragonite cement (BA). There is no preferential initiation point from which the cements start to grow; they are found growing out into pores from the floors, walls and ceilings of the cavities. Sample from Tongue of the Ocean, Bahamas foreslope. Depth 152m. B) Thin-section photomicrograph (crossed nicols) showing an individual fan of botryoidal aragonite with a minimum of 6 discontinuity surfaces or "dust lines" (arrows). these discontinuity surfaces consist, mainly of small, dark, irregularly shaped inclusions 1-3 microm in diameter. |
| Caption (German) | Titel Register der Originalablage: Carbonate rocks: marine cements. Fig. 2. - Hand-specimen photographs of botryoidal aragonite. A) Large mass of cavity-filling cement made up of numerous fans of botryoidal aragonite up to 36mm long. Number 1 and 2 indicate two of the individual botryoids sampled for radiocarbon and stable-isotope analyses. Sample from Belize foreslope. Depth 143m. B) Close-up of sample site 1 shown in Figure 2A. Fan of botryoidal aragonite is 36mm longfrom top to bottom. Sample sites for radiocarbon dating (X) are centered at 2mm, 17mm and 34mm from base of botryoid. Small holes are from stable-isotope sampling transect. Fig. 3. - Photomicrographs of botryoidal aragonite. A) Thin-section photomicrograph (crossed nicols) showing compound growth of pore-filling botryoidal aragonite cement (BA). There is no preferential initiation point from which the cements start to grow; they are found growing out into pores from the floors, walls and ceilings of the cavities. Sample from Tongue of the Ocean, Bahamas foreslope. Depth 152m. B) Thin-section photomicrograph (crossed nicols) showing an individual fan of botryoidal aragonite with a minimum of 6 discontinuity surfaces or "dust lines" (arrows). these discontinuity surfaces consist, mainly of small, dark, irregularly shaped inclusions 1-3 mikrom in diameter. |
| Physical description | Fotografie : Diapositiv |
| Format | 2,4 x 3,6 cm |
| Colour | farbig |
| Orientation | Querformat |
| Categories |
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| License | CC BY-SA 4.0 |
| Copyright notice | ETH-Bibliothek Zürich, Bildarchiv / Fotograf: Unbekannt / Dia_363-0853 / CC BY-SA 4.0 |
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