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The Ash Occurs in Three Large Pockets Intermixed with Clay Material

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The Ash Occurs in Three Large Pockets Intermixed with Clay Material Lament GeologicalObservatory^ Columbia University . Preliminary Description ..... ^uoT FOR PUBL1CMI9JL V - 15 - 8 Megascopic Description of Split Core Latitude: 10°11'N Longitude: 78°30'W Corr. depth: 1798 M P.D.R. depth: 963 fm. Date taken: 9 Nov 1958 Date opened: 20 Feb 1961 Described by: T. Willis Core length: 551 cm Plow-in: ~ 0-42 cm Brown silty calcilutite containing about 10% forams, becoming generally lighter with depth. Top 10 cm a disturbed gray and light brown mixture. Manganese appears to constitute an important part of the silt fraction, with a 1mm manganese nodule appearing at 14 cm. A reworked layer of^dark brown calcilutite containing an increased fraction of manganese occurs at 16-18 cm. The layer is indistinctly burrow mottled with lighter brown material in the upper section and with gray material in the lower section. Lower contact gradational and arbitrary. 42-39-8 cm ' Gray silty calcilutite containing about 10% forams and occasional pteropods, becoming slightly greener with depth. The layer, which was stored in the first tube (0-30 0 ) has been almost completely oxidized to a light brown color with a watery texture, while the rest of the core is in reasonably good condition. Burrow mottling is evident in the section after 300 cm, and, since there is no material change, by inference, in the 42-300 cm zone as well, although it cannot be readily seen. The burrows are filled with generally darker, coarser material. Prominent burrows occur at 295-315 cm, and at 335 and 344 cms. Black streaks of a sulfide material, probably ferrous sulfide, occur irregularly through the layer, with slight concentrations at 60-92cm, 124 cm, 168-175 cm and 224-228cms. Well defined streaks occur in the second section from 295- 351 cm. Irregular orange brown streaks of hydrotroilite also appear, generally in the form of poorly defined faint horizontal bands. These irregular bands occur at 54, 76, 124, 1 3 1 . 217 and 319 cms. 348-355 cm Fine white ash in a highly disturbed state, probably due to the impact of the core pipe on the firm layer. The ash occurs in three large pockets intermixed with clay material. The pocket at 353 cm seems to be the least disturbed and from it can be inferred that the layer was 1.5-2 cm thick and occured at approximately that level. 355-551 cm Gray green silty calcilutite somewhat darker than 42-351 cm, but essentially similar. Well defined lamina of hydrotroilalfe occur at 399 and 400 cm, with a less well defined band at 415 cm. Horizontal Lamont Geological Observatory CO o f < Columbia University Cb Preliminary Description ^ NOT FOR PUBLICATION <£5 V - 15 - 8 ZD Megascopic Description of Split Core continued f'V O streaked lamina of ferrous sulfide occur at 459 Q and 482 cms. These lamina, as well as the CD hydrotroilite bands} seem to be associated with a slight increase in the foram fraction. The layer is burrow mottled. Observations: The ash layer appears to be the eastern counterpart of the Worzel ash layer on the west coast. LL £ N* LJ 00 Li< Cl cb 2E Z> DC o oCD Lamont Geolog C olum'b ia Un 1 v e r s 1 1:y Preliminary Description *Tnrp WOP PUBLICATION Megascopic Description of a Split Gore Latitude : Ok 15*N Longitude: 85 06'¥ Corr, depth: 3266 M P.D.R depth: 1750 fra Date taken: 1 December 1958 Date opened: Described by: C. Fray Flow-in: 280 csn. Core length: 959 era. 0-120 cm.- Lutite, grayish-green with slight purplish tint, fairly soft. Color is mottled indicating material reworked by burrowing organisms except between 93 and 101 era. where tnere is no clear evidence of mottling. Lutite contains numerous foraraini- fera. Bottom contact horizontal and distinct due to color change. 120-123 cm.- Brown lutite containing forarainiiera. May have greater silt content than sections above and below. Bottom contact hori- zontal and sharp due to color change. Slight mottling due to burrowing. 123-153 cm.- Lutite, grayish-green with purplish tint. Color mottled due to burrowing. Lutite contains forarainifera. From 15.0-11:3 cm. sediment is darker green and oxidizes to a greenish-brown in- stead of to a brown as do the sections above. Bottom contact horizontal and distinct due to color change. 153-155 cn.- Lutite, light grayish-green with purplish tint which oxidizes to a light brown. Color is mottled. Lutite contains foramini- fera. Bottom contact horizontal and distinct due to color change. 155-302 cm.- Lutite, grayish-green with purplish tint. Color mottled due to burrowing. Lutite contains forarainifera throughout section. This section is similar to 0-120 era. Bottom contact horizontal and distinct due to color change and material. A patch of clean white volcanic ash (V/orzel Ash?) 1 x 3 cm. occurs at 156-159 cm. This ash does not form a layer but is surrounded by lutite. No similar material is apparent in this section. The possibility exists that the clay surrounding the patch of ash at 156 era. may have been introduced as a result of organisms burrowing through the ash and that the ash represents a distinct layer. 302-312 cm.- Greenish-brown silty lutite containing forarainifera. Color mottled due to burrowing. Bottom contact fairly distinct due to color and material change. 312-559 cm.- Similar to sections 0-120 cm. and 155-302 cm. Bottom contact sharp and horizontal due to color and material change. Between 382-558 cm. sediment is a more dark green in color but there does not appear to be any change in material. Lamont Geological Observatory 01 . Pnlnni’biQ- Jniversi'ty 2. Preliminary Description $0T FOR PUBLICATION ^ 3 51*9-582 cm.- Brown foraminiferal lutite. Mottling indicates material re- worked by burrowing. Bottom contact sharp and essentially horizontal due to color and material change. Piston effect occurs between 551-560 cm. 582-611 cm.- Similar to 0-120 cm. section. 611-612 cm.- Light brown lutite. Bottom contact above and below is hori- zontal and distinct. No mottling evident. It probably re- presents oxidation of the overlying lutite at the contact with the ash during storage as a result of the greater porosity of the ash allowing the circulation of air. 612 6 6 - l cm.- Volcanic ash, grayish-white with a somewhat purple tint. Contact with underlying lutite sharp and horizontal. 616-632 cm.- Similar to section 582-611 and 0-120 cm. 632-716 cm.- Similar tc 616-632 cm. layer except it oxidizes to a lighter brown giving it the appearance of a distinct layer. 716-772 cm.- Similar to section 0-120 cm. except it is darker in color and oxidizes to a greenish-brown. 772-828 cm.- Similar to 632-716 cm. layer. 828-81*5 cm.- Lutite, dark grayish-green with purple tint. Color is mottled. Contains foraminifera. Two possible incipient manganese nodules occur at 838 and 839 cm. Bottom contact sharp and horizontal due to color change. 81*5-959 cra.- Similar to 772-828 cm. layer. •Lamont Geological Observatory of G n Columbia UrAvfirr:’ty '^Preliminary Do scrip tiori 15 - 40 ROT FOR PUBLICATION Latitude: 11 °05'S Longitude: 82°31'W Corr. depth: 4470 M P.D.R. depth: 2380 fm. Date Taken: 11 Dec. 1958 Date Described: 22 June 1961 Described By: D. Bauchelle Flow-in: 0 Core Length: 1662 cm. BOORUM BOORUM & IASE “ MoTI General Description: This core falls in the red-clay category. Various shades of beige and brown define the layers. M a n y show reworking by burrowers. The bottom 20 feet± have the texture associated with diatoms, volcanic glass, or radiolarians. This type material also occurs scattered at higher levels. There is a 9-10 c m . layer of ma n g a n e s e grains at ~ 2 l ft. 0-0*29 cm. A grey-brown lutite speckled by dark br o w n ma n g a n e s e stains above 18 cm. Part of the manganese has been oxidized to orange. Burrows of two sizes mottle this layer - s o m e with diameters of o»l c m . , others with burrows of 1 m m . size. The top 5 cm. m a y be another layer of lighter lutite also marked by dark brown manganese coloring. Bottom contact burrowed but clear by color. 29-32 c m . Slightly lighter grey-brown than above. B u r r o w e d and reworked. Contacts ” <f ” <f irregular but clear. v r / 32-37 c m . s Grey-brown color of 5-28 cm. zone. Slightly darker though. Both large and small burrows as all above layers. , 37-58 cm. Lighter beige lutite. Not so grey as above. Burrow mottled, few small burrows, m a n y large. One large (l| x 2 cm.) burrow between 54 and 56 cm. is greenish and flecked with manganese grains. Surface of sliced core shows some small tears usually characteristic of a coarser material in the lutite, s e e m s to be volcanic glass and/or radiolaria. Radiolaria have been identified lower in the core. The concentration here does not justify a search. Contact burrowed. 58-332 c m . BOORUM BOORUM & PEASE * N 5 £ Grey-brown lutite. Color is graded and changed by iron oxide stains from the core pipe. Section reworked by large burrowers. Surface of core shows s o m e small tears characteristic of gritty lutite especially between 100-140 cm. and 170-250 cm. Five ’'proto-inanganese nodules" about pea size occur in a chain at 234 cm.
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