Publication Date:
2023-08-28
Description:
Local variability of manganese nodule facies and associated sediments were studied around abyssal hills (60 x 60 km²) located in the equatorial zone of the Central Pacific Basin. Small-scale variations in nodule occurrence, mineralogy, chemistry, and internal structure are discussed in relation to seismic records and sediment lithology. The slow sedimentation rate from the late Tertiary to the Quaternary appear to have promoted formation of nodules around the abyssal hills, although the Plio-Pleistocene hiatus at depths below sediment surface suggests no clear evidence of increased growth of nodules during the period. In the area of rapid and continuous sedimentation away from the hill areas, nodules are rare probably because of insufficient lifting force for nodules. Mineralogical and chemical studies reveal that the two principal nodule morphologies (smooth and rough surfaces) result from preferential deposition of hydrogenous or diagenetic manganese minerals in relation to early diagenesis of surface siliceous sediments. Regional variability of nodule-surface morphology and composition suggests a very local change in sedimentary conditions in space, and internal mineral variation suggests changes in sedimentary conditions with time. The geological factors controlling the small-scale variability of nodule facies seem to be similar to those controlling regional-scale variations.
Keywords:
BC; Box corer; Deposit type; DEPTH, sediment/rock; Description; Dredge; DRG; Elevation of event; Event label; FFGR; Free-fall grab; Geochemistry; GH81-4; GH81-4-B59; GH81-4-B60; GH81-4-B61; GH81-4-B64; GH81-4-B65; GH81-4-B66; GH81-4-B67; GH81-4-B68; GH81-4-D496; GH81-4-FG311; GH81-4-FG312; GH81-4-FG313; GH81-4-FG314; GH81-4-FG315; GH81-4-FG316-1; GH81-4-FG316-2; GH81-4-FG317; GH81-4-FG322-1; GH81-4-FG322-2; GH81-4-FG327; GH81-4-FG329; GH81-4-FG334; GH81-4-FG335; GH81-4-FG338; GH81-4-FG341-1; GH81-4-FG341-2; GH81-4-FG342; GH81-4-FG343; GH81-4-FG344; GH81-4-FG345; GH81-4-FG350; GH81-4-FG351; GH81-4-FG352; GH81-4-FG353; GH81-4-FG355; GH81-4-FG356; GH81-4-FG357; GH81-4-FG358; GH81-4-FG360; GH81-4-FG361; GH81-4-FG362; GH81-4-FG363; GH81-4-FG364; GH81-4-FG365; GH81-4-FG366; GH81-4-FG367; GH81-4-FG368; GH81-4-FG369; GH81-4-FG370; GH81-4-FG372; GH81-4-FG373; GH81-4-FG374; GH81-4-FG375; GH81-4-FG376; GH81-4-FG377; GH81-4-FG378; GH81-4-FG379; GH81-4-FG380; GH81-4-FG381; GH81-4-FG382; GH81-4-FG384; GH81-4-FG385; GH81-4-FG386; GH81-4-FG387; GH81-4-FG390; GH81-4-FG391; GH81-4-FG392; GH81-4-FG394; GH81-4-FG395; GH81-4-FG396; GH81-4-FG397; GH81-4-FG400; GH81-4-FG402; GH81-4-FG403; GH81-4-FG405; GH81-4-FG407; GH81-4-FG408; GH81-4-FG410; GH81-4-FG412; GH81-4-FG413; GH81-4-FG418; GH81-4-FG422; GH81-4-FG423; GH81-4-FG424; GH81-4-FG425; GH81-4-FG426; GH81-4-P220-H56; GH81-4-P224-H60; GH81-4-P225-H61; GH81-4-P229-H65; Hakurei-Maru No.2 (1980); Identification; Latitude of event; Longitude of event; manganese micronodule; manganese nodule; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Nodule, areal coverage; Nodules; Nodules, mass abundance; ocean; Pacific Ocean; PC; Piston corer; sediment; Station 2577; Station 2578; Station 2579; Station 2580; Station 2581; Station 2582; Station 2583; Station 2588; Station 2594; Station 2596; Station 2597; Station 2598; Station 2605; Station 2606; Station 2608; Station 2609; Station 2610; Station 2611; Station 2617; Station 2619; Station 2620; Station 2621; Station 2622; Station 2624; Station 2625; Station 2626; Station 2627; Station 2628; Station 2630; Station 2631; Station 2632; Station 2633; Station 2634; Station 2635; Station 2636; Station 2637; Station 2638; Station 2640; Station 2641; Station 2642; Station 2644; Station 2646; Station 2647; Station 2648; Station 2649; Station 2650; Station 2651; Station 2652; Station 2653; Station 2654; Station 2655; Station 2656; Station 2657; Station 2659; Station 2660; Station 2661; Station 2662; Station 2663; Station 2665; Station 2666; Station 2667; Station 2669; Station 2670; Station 2671; Station 2672; Station 2677; Station 2678; Station 2679; Station 2680; Station 2681; Station 2684; Station 2686; Station 2687; Station 2690; Station 2692; Station 2693; Station 2695; Station 2696; Station 2698; Station 2699; Station 2705; Station 2706; Station 2710; Station 2711; Station 2712; Station 2713
Type:
Dataset
Format:
text/tab-separated-values, 1141 data points
