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  • 1
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    Table 3: Reproductive viability of Hemichloris antarctica after cycles of cooling und warming (1988)
    PANGAEA
    In:  Supplement to: Meyer, M A; Huang, G-H; Morris, G J; Friedmann, E Imre (1988): 2.2 The effect of low temperatures on Antarctic endolithic green algae. Polarforschung, 58(2/3), 113-119, hdl:10013/epic.29606.d001
    Details
    Publication Date: 2023-07-10
    Description: Laboratory experiments show that undercooling to about -5°C occurs in colonized Beacon sandstones of the Ross Desert, Antarctica. High-frequency temperature oscillations between 5°C and -5°C or -10°C (which occur in nature on the rock surface) did not damage Hemichloris antarctica. In a cryomicroscope, H. antarctica appeared to be undamaged after slow or rapid cooling to -50°C. l4CO2 incorporation after freezing to -20°C was unaffected in H. antarctica or in Trebouxia sp. but slightly depressed in Stichococcus sp. (isolated from a less extreme Antarctic habitat). These results suggest that the freezing regime in the Antarctic desert is not injurious to endolithic algae. It is likely that the freezing-point depression inside the rock makes available liquid water for metabolic activity at subzero temperatures. Freezing may occur more frequently on the rock surface and contribute to the abiotic nature of the surface.
    Keywords: Age; Cycles; Range; Standard deviation; Viability
    Type: Dataset
    Format: text/tab-separated-values, 112 data points
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  • 2
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    Annotated record of the detailed examination of Mn deposits from DSDP Leg 96 (Holes 614A, 618, 619, 620, 623, 624) (1987)
    PANGAEA
    Details
    Publication Date: 2023-08-28
    Description: The Mississippi Fan is a broad, arcuate accumulation of Pleistocene deep-water sediments deposited in the eastern Gulf of Mexico. Major objectives for drilling the Mississippi Fan were to place the fan lobes into a time-stratigraphic framework, to determine if the midfan channel is migratory in nature, to establish the lithological characteristics of the acoustical high-amplitude zone present near the bottom of the channel fill, to analyze if sand is transported to the lower fan and in which depositional mode it is emplaced, to confirm or modify existing fan models, and to determine the physical and chemical characteristics of these deep-sea fan deposits. In addition to the nine sites situated on the Mississippi fan, two sites (618 and 619) were occupied on the continental slope off Louisiana in intraslope basins formed as the result of active salt diapirism.
    Keywords: 96-614A; 96-618; 96-619; 96-620; 96-623; 96-624; Comment; Deep Sea Drilling Project; Deposit type; DEPTH, sediment/rock; Description; DRILL; Drilling/drill rig; DSDP; Event label; Glomar Challenger; Gulf of Mexico; Gulf of Mexico/BASIN; Gulf of Mexico/FAN; Identification; Leg96; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Position; Quantity of deposit; Sample code/label; Sediment type; Visual description
    Type: Dataset
    Format: text/tab-separated-values, 160 data points
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  • 3
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    Clay mineralogy of ODP Leg 103 sites (Table 1) (1988)
    PANGAEA
    In:  Supplement to: Meyer, Audrey W; Davies, Thomas A (1988): Clay mineralogy of sediments from the Galicia margin, ODP Leg 103. In: Boillot, G; Winterer, EL; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 103, 461-475, https://doi.org/10.2973/odp.proc.sr.103.131.1988
    Details
    Publication Date: 2024-01-09
    Description: Samples from Cenozoic and Mesozoic sediments drilled during ODP Leg 103 were analyzed for clay mineralogy. Kaolinite, chlorite, illite, and smectite occur in most of the samples studied; palygorskite and sepiolite occur principally in Paleogene and Eocene brown clays. In general, throughout the section deposited in the syn- and post-rift period, the more calcareous-rich pelagic sediments contain greater amounts of smectite and lesser amounts of kaolinite and chlorite than do the calcareous-poor terrigenous sediments. The clay data presented here also lend support to the general paleoenvironmental interpretation of a relatively warm climate throughout the Cretaceous and early Tertiary and a relatively cooler climate from the Oligocene to the present day.
    Keywords: 103-637A; 103-638B; 103-638C; 103-639A; 103-639B; 103-639C; 103-639D; 103-640A; 103-641A; 103-641C; Chlorite; Chlorite (peak height); DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Illite; Illite (peak area); Joides Resolution; Kaolinite; Kaolinite (peak height); Kaolinite+Chlorite; Kaolinite+Chlorite (peak area); Leg103; Ocean Drilling Program; ODP; Palygorskite; Palygorskite (peak area); Sample code/label; Sepiolite; Sepiolite (peak area); Smectite; Smectite (peak area); South Atlantic Ocean; Sum; X-ray diffraction (XRD)
    Type: Dataset
    Format: text/tab-separated-values, 3235 data points
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