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  • 1
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    Unbekannt
    Meiofauna and the structure of the benthic community in the Iberian deep sea basin (1972)
    PANGAEA
    In:  Supplement to: Thiel, Hjalmar (1972): Meiofauna und Struktur der benthischen Lebensgemeinschaft des Iberischen Tiefseebeckens. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe D Biologie, Gebrüder Bornträger, Berlin, Stuttgart, D12, 36-51
    Details
    Publikationsdatum: 2024-06-26
    Beschreibung: 1. On the cruises 3 and 15 of R.V. "Meteor" 6 grab samples, and 6 hauls with the 6 m Agassiztrawl were taken and at 2 stations the deep sea camera was lowered. This material gave quantitative results on the meiofauna and minimum counts of the macrofauna. 2. The nematodes constitute nearly 95% of the meiofauna, the copepoda only 2%. With increasing sediment depth the density of animals decrease gradually. In the uppermost centimeter of sediment 42.6% of the meiofauna are found while only 3.7% live in layer 6-7 cm. Meiofauna weight ranges from 0.6-5.7 mg/25 m**2 surface i.e. 0.24-2.8 g/m**2. 3. Mean numbers of individuals and weights show standard errors of 20-30 %. As an approximate average values for further considerations the weight of the meiofauna in the area was taken as 1 g/m**2 4. Quantitative information on the macrofauna is derived from the trawls and the photographs for the actinia Chitonanthus abyssorum only, which is found in the rate of 1 individual/36-72 m**2, but seems to be less abundant generally. 5. Animal density does not decrease steadily from nearshore to offshore biocoenoses, i.e. generally with increasing depth. The decrease is more pronounced for macro- than for meiofauna. For the deep sea the weight proportion of macrofauna : meiofauna is of the order of 1 : 1. 6. With the assumption, that adaptation of metabolism to deep sea conditions is similar in macro- and meiofauna total metabolism of invertebrates is ascribed to meiofauna to more than 80%. 7. The structure of the biocoenosis of the deep sea floor is characterized by the meiofauna living on and in the sediment and by the dominance of sediment feeders in the macrofauna. 8. Considering the large numbets and high partition rates of bacteria a comparative large part of the metabolism in the deep sea sediment must be ascribed to bacteria. This favours the hypothesis, that with increasing depth and decreasing addition of organic material to the sediment, the importance of meiofauna and microorganisms for total metabolism increases. 9. Considering the different modes of food transport to the deep sea environment, i.e. sinking of dead particles, transport by vertical migration of organisms, aggregation of organic particles, adsorption of dissoloved organic substance to inorganic particles, and heterotrophy, the sediment may be assumed to contain more food for invertebrates than the water above the bottom. 10. Suspensions feeders of macrofauna are fixed to hard substrates in the sediment surface. Some of them are shown to bend themselves down to the bottom in underwater photographs. This suggests the idea that some deep sea suspension feeders partly depend on food from the sediment surface, on which they feed directly.
    Schlagwort(e): ADEPD; Atlantic Data Base for Exchange Processes at the Deep Sea Floor; BCR; Box corer (Reineck); Iberian deep sea; M3; M3/1_012; M3/1_018; M3/1_021; M3/1_029; M3/1_031; M3/1_035; Meteor (1964); van Veen Grab; VGRAB
    Materialart: Dataset
    Format: application/zip, 15 datasets
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    Unbekannt
    Velocities and elastic moduli of basalts from Pacific DSDP sites (1973)
    PANGAEA
    In:  Supplement to: Christensen, Nikolas I; Salisbury, Matthew H (1973): Velocities, elastic moduli and weathering-age relations for Pacific Layer 2 basalts. Earth and Planetary Science Letters, 19(4), 461-470, https://doi.org/10.1016/0012-821X(73)90190-8
    Details
    Publikationsdatum: 2024-06-26
    Beschreibung: Compressional (Vp) and shear (Vs) wave velocities have been measured to 10 kb in 32 cores of basalt from 14 Pacific sites of the Deep Sea Drilling Project. Both Vp and V s show wide ranges (3.70 to 6.38 km/sec for Vp and 1.77 to 3.40 km/sec for V s at 0.5 kb) which are linearly related to density and sea floor age, confirming earlier findings by Christensen and Salisbury of decreasing velocity with progressive submarine weathering based on studies of basalts from five sites in the Atlantic. Combined Pacific and Atlantic data give rates of decreasing velocity of -1.89 and -1.35 km/sec per 100 my for Vp and Vs respectively. New analyses of oceanic seismic refraction data indicate a decrease in layer 2 velocities with age similar to that observed in the laboratory, suggesting that weathering penetrates to several hundred meters in many regions and is largely responsible for the extreme range and variability of layer 2 refraction velocities.
    Schlagwort(e): 5-32; 5-34; 5-36; 6-54; 6-57; 7-61; 7-61A; 7-63; 7-66; 9-77B; 9-79; 9-82; 9-83; 9-84; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg5; Leg6; Leg7; Leg9; North Pacific; North Pacific/BASIN; North Pacific/HILL; North Pacific/Philippine Sea/RIDGE; North Pacific/PLAIN; North Pacific/RIDGE; North Pacific/VALLEY
    Materialart: Dataset
    Format: application/zip, 3 datasets
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    Unbekannt
    Basalt density, basement age, and intrusive/extrusive relations from DSDP Legs 2 through 7, 9, and 14 (1973)
    PANGAEA
    In:  Supplement to: Salisbury, Matthew H; Christensen, Nikolas I (1973): Progressive weathering of submarine basalt with age: further evidence of sea-floor spreading. Geology, 1(2), 63 - 64, https://doi.org/10.1130/0091-7613(1973)1%3C63:PWOSBW%3E2.0.CO;2
    Details
    Publikationsdatum: 2024-06-26
    Beschreibung: Densities of layer 2 basalt recovered during the Deep Sea Drilling Project have been found to decrease steadily with age, a finding ascribed to progressive submarine weathering in the context of sea-floor spreading. The least-squares solution for 52 density measurements gives a rate of decrease in density of (Delta p)/(Delta t) = -0.0046 g per ccm m.y. = -16 percent per 100 m.y., which is in excellent agreement with earlier estimates based on observed chemical depletion rates of dredged oceanic basalt. Weathering of sea-floor basalt, should it penetrate to any considerable depth in layer 2, will decrease layer 2 seismic refraction velocities, act as a source of geothermal heat, and substantially influence the chemistry of sea water and the overlying column of sediment.
    Schlagwort(e): 14-136; 14-137; 14-138; 14-141; 2-10; 3-14; 3-15; 3-18; 3-19; 4-23; 5-32; 5-36; 6-54; 6-57; 7-61; 7-63; 7-66; 9-77B; 9-79; 9-82; 9-83; 9-84; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg14; Leg2; Leg3; Leg4; Leg5; Leg6; Leg7; Leg9; North Atlantic/CONT RISE; North Atlantic/DIAPIR; North Atlantic/HILL; North Pacific; North Pacific/BASIN; North Pacific/HILL; North Pacific/Philippine Sea/RIDGE; North Pacific/PLAIN; North Pacific/RIDGE; North Pacific/VALLEY; South Atlantic/CONT RISE; South Atlantic/HILL; South Atlantic/PLAIN; South Atlantic/RIDGE
    Materialart: Dataset
    Format: application/zip, 22 datasets
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
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    Sediment pigment equivalents of surface sediment samples M36_75-2a to M44_77-2e (1982)
    PANGAEA
    Details
    Publikationsdatum: 2024-06-26
    Schlagwort(e): ADEPD; Atlantic Data Base for Exchange Processes at the Deep Sea Floor; Auftrieb 75; Auftrieb77; BC; Box corer; Cape Blanc; Cape Peña Grande; Chlorophyll pigment equivalents; DEPTH, sediment/rock; Elevation of event; Event label; Fluorometric assay of acetone extraction (GF/F filtered); Latitude of event; Longitude of event; M36; M36_75-1a; M36_75-1b; M36_75-1c; M36_75-1d; M36_75-2a; M36_75-2b; M36_75-2c; M36_75-2d; M36_75-2e; M36_75-2f; M36_75-2g; M36_75-2h; M44; M44_77-1a; M44_77-1b; M44_77-1c; M44_77-1d; M44_77-1e; M44_77-1f; M44_77-1g; M44_77-1h; M44_77-2a; M44_77-2b; M44_77-2c; M44_77-2d; M44_77-2e; Meteor (1964)
    Materialart: Dataset
    Format: text/tab-separated-values, 25 data points
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
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    Chemical, isotopic and mineral compositions of basal metalliferous sediments from DSDP Legs 5 and 7 (1973)
    PANGAEA
    Details
    Publikationsdatum: 2024-06-26
    Beschreibung: Sediments from near the basement of a number of Deep Sea Drilling Project (DSDP) sites, from the Bauer Deep, and from the East Pacific Rise have unusually high transition metal-to-aluminum ratios. Similarities in the chemical, isotopic, and mineralogical compositions of these deposits point to a common origin. All the sediments studied have rare-earth-element (REE) patterns strongly resembling the pattern of sea water, implying either that the REE's were coprecipitated with ferromanganese hydroxyoxides (hydroxyoxides denote a mixture of unspecified hydrated oxides and hydroxides), or that they are incorporated in small concentrations of phosphatic fish debris found in all samples. Oxygen isotopic data indicate that the metalliferous sediments are in isotopic equilibrium with sea water and are composed of varying mixtures of two end-member phases with different oxygen isotopic compositions: an iron-manganese hydroxyoxide and an iron-rich montmorillonite. A low-temperature origin for the sediments is supported by mineralogical analyses by x-ray diffraction which show that goethite, iron-rich montmorillonite, and various manganese hydroxyoxides are the dominant phases present. Sr87/Sr86 ratios for the DSDP sediments are indistinguishable from the Sr87/Sr86 ratio in modern sea water. Since these sediments were formed 30 to 90 m.y. ago, when sea water had a lower Sr87/Sr86 value, the strontium in the poorly crystalline hydroxyoxides must be exchanging with interstitial water in open contact with sea water. In contrast, uranium isotopic data indicate that the metalliferous sediments have formed a closed system for this element. The sulfur isotopic compositions suggest that sea-water sulfur dominates these sediments with little or no contribution of magmatic or bacteriologically reduced sulfur. In contrast, ratios of lead isotopes in the metalliferous deposits resemble values for oceanic tholeiite basalt, but are quite different from ratios found in authigenic marine manganese nodules. Thus, lead in the metalliferous sediments appears to be of magmatic origin. The combined mineralogical, isotopic, and chemical data for these sediments suggest that they formed from hydrothermal solutions generated by the interaction of sea water with newly formed basalt crust at mid-ocean ridges. The crystallization of solid phases took place at low temperatures and was strongly influenced by sea water, which was the source for some of the elements found in the sediments.
    Schlagwort(e): 5-37; 5-38; 5-39; 7-66; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg5; Leg7; North Pacific/BASIN; North Pacific/HILL
    Materialart: Dataset
    Format: application/zip, 18 datasets
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  • 6
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    Chemical analysis of Mn nodules from the Pacific (1972)
    PANGAEA
    In:  Supplement to: UN (1972): Comparative table of draft treaties, working papers and draft articles. United Nations Secretariat for the Seabed Committee, https://searchworks.stanford.edu/view/673046
    Details
    Publikationsdatum: 2024-06-26
    Beschreibung: In 1970, the United States put forward the first detailed and comprehensive proposal for a regime which would apply to the mining of manganese nodules in the area beyond national jurisdiction. The United States' draft Convention on the International Seabed Area made a significant contribution towards moving the U.N. Seabed Committee from the stage of engaging in general debate to making specific proposals. In the U.S. draft, an "International Seabed Resource Authority" would have the power to license the mining of manganese nodules and would carry on certain supervisory activities in connection therewith. In the planning of the expected fast-approaching exploitation stage for manganese nodules the U.N. Seabed Committee collected and prepared documents and data in 1972 for an initial session of the Law of the Sea Conference which was expected to take place in 1973.
    Schlagwort(e): BC; Box corer; Core; CORE; Dredge, bucket; DRG_BU; FFGR; Free-fall grab; GC; GH76-1; GH76-1-FG30-2; Gravity corer; Hakurei-Maru (1974); NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Pacific Ocean; PC; Piston corer; SEAPLAD Seasonal Plankton Dynamics; Seascope Expedition; SS72/1; SS72/2; SS72/3; SS72/5; SS72/6; SS72-119PC; SS72-120PC; SS72-121PC; SS72-122DB; SS72-134DB; SS72-138DB; SS72-141DB; SS72-147DB; SS72-18DB; SS72-1CC; SS72-34SC; SS72-35SC; SS72-38CC; SS72-50DB; SS72-58DB; SS72-61DB; SS72-64DB; SS72-71DB; SS72-73DB; SS72-81DB; Station 432; VA09; VA09-KHU4; VA09-KHU6; VA09-KHU7; VA09-KHU8; VA09-KHU9; Valdivia (1961)
    Materialart: Dataset
    Format: application/zip, 3 datasets
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
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    Analysis of Mn-deposits from the Pacific (1974)
    PANGAEA
    In:  Supplement to: Piper, David Z (1974): Rare earth elements in ferromanganese nodules and other marine phases. Geochimica et Cosmochimica Acta, 38(7), 1007-1022, https://doi.org/10.1016/0016-7037(74)90002-7
    Details
    Publikationsdatum: 2024-06-26
    Beschreibung: The concentrations of rare-earth elements (REE) have been measured in 31 ferromanganese nodules from the Pacific and Indian Oceans and vary by almost a factor of 5. Too few nodules have been analyzed to define possible regional trends. The shale-normalized patterns, however, permit division of nodules into two groups: those from depth greater than 3000–3500 m and those from less depth. The factors that determine this change in the relative concentration of REE may be related to the mineralogy of manganese phases and/or the transport of REE to the deep ocean by particulate matter. Comparison of the REE patterns of nodules with those of phillipsite, phosphorite, clays, CaCO3 and seawater suggests that the patterns of these phases reflect fractionation from an initial pattern closely resembling that of shale. By assuming that the accumulation rate of REE in clays, CaCO3 and nodules is represented by that for surface sediments, it has been possible to estimate an accumulation rate of phillipsite in pelagic sediments of the Pacific of 0.02 mg/cm2/yr.
    Schlagwort(e): 2P-50; 5-37; ABR_Cruise7; ABR7_375-G; Agassiz; AMPH-006D; AMPH-007D; AMPH-009D; AMPH01AR; AMPH01AR-006D; AMPH02AR-007D; AMPH02AR-009D; AMPHITRITE; ANTIPODE; Anton Bruun; ANTP04MV-058D; ANTP-058D; Argo; DNWB0ABD; DODO; DODO-009D-1; DODO-011D; DODO-015D-1; DODO-113D; DODO-127D; DOWNWIND-B1; DOWNWIND-H; Dredge; Dredge, chain bag; Dredge, rock; DRG; DRG_C; DRG_R; DRILL; Drilling/drill rig; DWBD4; DWHD16; DWHD47; DWHD72; FANB01BD; FANBD-20D; FANBD-25D; FANFARE-B; GC; Glomar Challenger; Grab; GRAB; Gravity corer; GSS_537_551; Horizon; Indian Ocean; Leg5; MDPC02HO-036P; MDPC03HO-MP-043D; Melville; MIDPAC; MPC-36P; MPC-43D; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; North Pacific/HILL; Pacific Ocean; PC; PIP-MUS-11; PIP-MUS-21; PIP-NNN; Piston corer; PROA; PROA-072D; Prospector; Prospector-63; SAN_JUAN_1963; SB930001; SB930001-1D; SCAN; SCAN-035D; SCAN04AR-035D; Silas Bent; SNJ-DH5; SNJ-DH6; SNJ-DH9; Spencer F. Baird; STYX_I; STYX01AZ; STYX01AZ-003FF; STYXI-3FF; Thomas G. Thompson (1964); TT028; TT028-10; TT028-13; TT028-14; TT028-17; TT028-2; TT028-27; TT028-3; TT028-5; TT028-6; TT028-7; TT028-8; TT028-9; Western Pacific Ocean
    Materialart: Dataset
    Format: application/zip, 2 datasets
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
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    Meiofauna abundance in surface sediment sampled during cruise M26 (1982)
    PANGAEA
    Details
    Publikationsdatum: 2024-06-26
    Schlagwort(e): ADEPD; Atlantic Data Base for Exchange Processes at the Deep Sea Floor; Auftrieb 72; BCR; Box corer (Reineck); DEPTH, sediment/rock; Elevation of event; Event label; LATITUDE; LONGITUDE; M26; M26_168; M26_169; M26_170; M26_171; M26_172; M26_173; M26_174; M26_175; M26_176; M26_178; M26_179; M26_180; M26_181; M26_182; M26_183; M26_184; M26_185; Meiofauna, abundance of metazoa; Meteor (1964); NW-Africa, Canary Basin; NW-Africa, Cape Verde Abyssal Plain; van Veen Grab; VGRAB
    Materialart: Dataset
    Format: text/tab-separated-values, 17 data points
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
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    Unbekannt
    Occurrence of hiatuses PH and NH 1 through NH 7 in DSDP holes (1983)
    PANGAEA
    In:  Supplement to: Keller, Gerta; Barron, John A (1983): Paleoceanographic implications of Miocene deep-sea hiatuses. Geological Society of America Bulletin, 94(5), 590-613, https://doi.org/10.1130/0016-7606(1983)94%3C590:PIOMDH%3E2.0.CO;2
    Details
    Publikationsdatum: 2024-06-26
    Beschreibung: Miocene paleoceanographic evolution exhibits major changes resulting from the opening and closing of passages, the subsequent changes in oceanic circulation, and development of major Antarctic glaciation. The consequences and timing of these events can be observed in variations in the distribution of deep-sea hiatuses, sedimentation patterns, and biogeographic distribution of planktic organisms. The opening of the Drake Passage in the latest Oligocene to early Miocene (25-20 Ma) resulted in the establishment of the deep circumpolar current, which led to thermal isolation of Antarctica and increased global cooling. This development was associated with a major turnover in planktic organisms, resulting in the evolution of Neogene assemblages and the eventual extinction of Paleogene assemblages. The erosive patterns of two widespread hiatuses (PH, 23.0-22.5 Ma; and NH 1, 20-18 Ma) indicate that a deep circumequatorial circulation existed at this time, characterized by a broad band of carbonate-ooze deposition. Siliceous sedimentation was restricted to the North Atlantic and a narrow band around Antarctica. A major reorganization in deep-sea sedimentation and hiatus distribution patterns occurred near the early/middle Miocene boundary, apparently resulting from changes in oceanic circulation. Beginning at this time, deep-sea erosion occurred throughout the Caribbean (hiatus NH 2, 16-15 Ma), suggesting disruption of the deep circumequatorial circulation and northward deflection of deep currents, and/or intensification of the Gulf Stream. Sediment distribution patterns changed dramatically with the sudden appearance of siliceous-ooze deposition in the marginal and east equatorial North Pacific by 16.0 to 15.5 Ma, coincident with the decline of siliceous sedimentation in the North Atlantic. This silica switch may have been caused by the introduction of Norwegian Overflow Water into the North Atlantic acting as a barrier to outcropping of silica-rich Antarctic Bottom Water. The main aspects of the present oceanic circulation system and sediment distribution pattern were established by 13.5 to 12.5 Ma (hiatus NH 3), coincident with the establishment of a major East Antarctic ice cap. Antarctic glaciation resulted in a broadening belt of siliceous-ooze deposition around Antarctica, increased siliceous sedimentation in the marginal and east equatorial North Pacific and Indian Oceans, and further northward restriction of siliceous sediments in the North Atlantic. Periodic cool climatic events were accompanied by lower eustatic sea levels and widespread deep-sea erosion at 12 to 11 Ma (NH 4), 10 to 9 Ma (NH 5), 7.5 to 6.2 Ma (NH 6), and 5.2 to 4.7 Ma (NH 7).
    Schlagwort(e): 10-90; 10-97; 11-101; 11-102; 11-103; 11-104; 12-111; 12-116; 12-119; 14-141; 14-142; 15-149; 15-150; 15-151; 15-153; 15-154; 16-155; 16-157; 16-158; 16-159; 16-160; 16-161; 16-162; 16-163; 17-164; 17-165; 17-166; 17-168; 17-170; 17-171; 18-172; 18-173; 19-183; 19-192; 20-199; 20-200; 20-202; 21-205; 21-206; 21-207; 21-208; 21-209; 21-210; 22-212; 22-213; 22-214; 22-215; 22-216; 22-218; 23-220; 23-221; 23-223; 23-224; 24-231; 24-234; 24-236; 24-237; 24-238; 26-251; 26-253; 26-254; 26-255; 26-256; 26-257; 26-258; 27-259; 28-264; 28-265; 28-266; 28-273; 28-274; 29-275; 29-276; 29-277; 29-278; 29-279; 29-280; 29-281; 29-282; 29-283; 29-284; 30-285; 30-286; 30-287; 30-288; 30-289; 31-290; 31-292; 31-296; 3-14; 3-15; 3-17; 3-20; 32-304; 32-305; 32-306; 32-307; 32-308; 32-310; 32-311; 32-313; 33-315; 33-316; 33-317; 33-318; 34-319; 36-327; 36-328; 36-329; 37-334; 38-336; 38-338; 38-339; 38-352; 39-354; 39-355; 39-356; 39-357; 39-359; 40-360; 40-362; 40-363; 40-364; 41-366; 41-368; 41-369; 42-372; 4-25; 4-29; 4-30; 43-386; 44-391; 45-396; 47-397; 47-398; 48-400; 48-404; 48-405; 48-406; 49-407; 49-408; 49-410; 5-34; 5-36; 5-38; 5-39; 5-40; 5-41; 5-42; 55-430; 55-431; 55-432; 55-433; 56-436; 57-438; 57-439; 57-440; 58-443; 58-444; 58-445; 59-447; 59-448; 59-449; 59-450; 59-451; 61-462; 62-463; 62-464; 62-465; 62-466; 63-467; 63-468; 63-469; 63-470; 63-471; 63-472; 6-45; 6-46; 6-47; 6-48; 6-49; 6-50; 6-51; 6-52; 6-53; 6-55; 6-56; 67-495; 68-503; 7-61; 7-62; 7-63; 7-64; 7-65; 7-66; 7-67; 8-68; 8-69; 8-70; 8-71; 8-72; 8-73; 8-74; 8-75; 9-77; 9-78; 9-79; 9-83; 9-84; Antarctic Ocean; Antarctic Ocean/BASIN; Antarctic Ocean/CONT RISE; Antarctic Ocean/PLATEAU; Antarctic Ocean/RIDGE; Antarctic Ocean/Tasman Sea; Antarctic Ocean/Tasman Sea/CONT RISE; Antarctic Ocean/Tasman Sea/PLATEAU; Antarctic Ocean/Tasman Sea/RIDGE; Caribbean Sea/BASIN; Caribbean Sea/GAP; Caribbean Sea/RIDGE; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Gulf of Mexico/BANK; Gulf of Mexico/PLAIN; Indian Ocean//BASIN; Indian Ocean//FAN; Indian Ocean//FRACTURE ZONE; Indian Ocean//PLATEAU; Indian Ocean//RIDGE; Indian Ocean/Arabian Sea/HILL; Indian Ocean/Arabian Sea/PLAIN; Indian Ocean/Arabian Sea/RIDGE; Indian Ocean/Gulf of Aden/BASIN; Leg10; Leg11; Leg12; Leg14; Leg15; Leg16; Leg17; Leg18; Leg19; Leg20; Leg21; Leg22; Leg23; Leg24; Leg26; Leg27; Leg28; Leg29; Leg3; Leg30; Leg31; Leg32; Leg33; Leg34; Leg36; Leg37; Leg38; Leg39; Leg4; Leg40; Leg41; Leg42; Leg43; Leg44; Leg45; Leg47; Leg48; Leg49; Leg5; Leg55; Leg56; Leg57; Leg58; Leg59; Leg6; Leg61; Leg62; Leg63; Leg67; Leg68; Leg7; Leg8; Leg9; Mediterranean Sea/BASIN; North Atlantic/BASIN; North Atlantic/CONT RISE; North Atlantic/CONT SLOPE; North Atlantic/DIAPIR; North Atlantic/KNOLL; North Atlantic/Norwegian Sea; North Atlantic/Norwegian Sea/DIAPIR; North Atlantic/Norwegian Sea/PLATEAU; North Atlantic/PLAIN; North Atlantic/PLATEAU; North Atlantic/RIDGE; North Atlantic/SEAMOUNT; North Atlantic/SEDIMENT POND; North Pacific; North Pacific/ABYSSAL FLOOR; North Pacific/BASIN; North Pacific/CONT RISE; North Pacific/ESCARPMENT; North Pacific/FAN; North Pacific/FLANK; North Pacific/GAP; North Pacific/GUYOT; North Pacific/HILL; North Pacific/Philippine Sea/BASIN; North Pacific/Philippine Sea/CONT RISE; North Pacific/Philippine Sea/RIDGE; North Pacific/PLAIN; North Pacific/PLATEAU; North Pacific/RIDGE; North Pacific/SEAMOUNT; North Pacific/SEDIMENT POND; North Pacific/SLOPE; North Pacific/TERRACE; North Pacific/TRENCH; North Pacific/VALLEY; South Atlantic; South Atlantic/BANK; South Atlantic/BASIN; South Atlantic/CONT RISE; South Atlantic/HILL; South Atlantic/PLATEAU; South Atlantic/RIDGE; South Atlantic/SEAMOUNT; South Atlantic/SYNCLINE; South Atlantic/VALLEY; South Pacific; South Pacific/BASIN; South Pacific/CONT RISE; South Pacific/Coral Sea; South Pacific/Coral Sea/BASIN; South Pacific/Coral Sea/PLATEAU; South Pacific/PLATEAU; South Pacific/RIDGE; South Pacific/Tasman Sea/BASIN; South Pacific/Tasman Sea/CONT RISE
    Materialart: Dataset
    Format: application/zip, 3 datasets
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  • 10
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    Composition of Cretaceous basalts from DSDP Hole 16-163 (1973)
    PANGAEA
    Details
    Publikationsdatum: 2024-06-26
    Beschreibung: Basalt underlying early Campanian chalk at Deep Sea Drilling Project (DSDP) Site 163 is divided into seven extrusive cooling units bounded by glassy margins. The margins have dips of 15° to 70°, suggestive of pillow flows rather than tabular flows. The margins are fresh sideromelane (glass) grading inward to opaque and reddish-brown globules containing microcrystalline material with radial, undulose extinction. Relative to adjacent sideromelane, the reddish-brown globules are enriched in sodium and calcium, whereas the opaque globules are depleted in these elements and enriched in iron and magnesium. It appears that basalt just inside the pillow margins has differentiated in place into globules of two distinct compositions. This globule zone grades inward to less rapidly cooled pyroxene varioles and intergrowths of plagioclase and opaque minerals. In the center of the thicker cooling units, the texture is diabasic. Alteration and calcite vein abundance are greatest at pillow margins and decrease inward; the interior of the thickest cooling unit is only slightly altered, and calcite veins are absent. Chemical analysis of whole rock by atomic absorption spectrophotometry, and of sideromelane by electron microprobe, indicates that the rock is a slightly weathered tholeiite. The atomic absorption analyses, except the one nearest the top of the basalt, are relatively uniform and similar to the sideromelane microprobe analyses, including those near the top of the basalt. This suggests that deep penetration is not necessary to get through the severely altered layer at the basalt surface, and that within this altered layer, analyses of sideromelane may be more representative of crustal composition than analyses of whole rock.
    Schlagwort(e): 16-163; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg16; North Pacific/CONT RISE
    Materialart: Dataset
    Format: application/zip, 4 datasets
    Standort Signatur Erwartet Verfügbarkeit
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    DATEN PANGAEA
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