caa a22 4500 463216423 CHVBK 20180405153157.0 cr unu---uuuuu 170326e20071001xx s 000 0 eng 10.1007/s00367-007-0055-5 doi (NATIONALLICENCE)springer-10.1007/s00367-007-0055-5 Co-rich Mn crusts from the Magellan Seamount cluster: the long journey through time [Elektronische Daten] [Geoffrey Glasby, Xiangwen Ren, Xuefa Shi, Irina Pulyaeva] The Magellan seamounts began forming as large submarine shield volcanoes south of the equator during the Cretaceous. These volcanoes formed as a cluster on the small Pacific plate in a period when tectonic stress was absent. Thermal subsidence of the seafloor led to sinking of these volcanoes and the formation of guyots as the seamounts crossed the equatorial South Pacific (10-0°S) sequentially and ocean surface temperatures became too high for calcareous organisms to survive. Guyot formation was completed between about 59 and 45Ma and the guyots became phosphatized at about 39-34 and 27-21Ma. Ferromanganese crusts began formation as proto-crusts on the seamounts and guyots of the Magellan Seamount cluster towards the end of the Cretaceous up to 55Ma after the formation of the seamounts themselves. The chemical composition of these crusts evolved over time in a series of steps in response to changes in global climate and ocean circulation. The great thickness of these crusts (up to 15-20cm) reflects their very long period of growth. The high Co contents of the outer parts of the crusts are a consequence of the increasing deep circulation of the ocean and the resulting deepening of the oxygen minimum zone with time. Growth of the Co-rich Mn crusts in the Magellan Seamount cluster can be considered to be the culmination of a long journey through time. Springer-Verlag, 2007 Glasby Geoffrey Marine Geology Division, First Institute of Oceanography, SOA, 6 Xianxialing Road, 266061, Qingdao, China aut Ren Xiangwen Marine Geology Division, First Institute of Oceanography, SOA, 6 Xianxialing Road, 266061, Qingdao, China aut Shi Xuefa Marine Geology Division, First Institute of Oceanography, SOA, 6 Xianxialing Road, 266061, Qingdao, China aut Pulyaeva Irina Northern Caucasus Academy of Federal Service, 47 Kirov Street, Pyatigorsk, Russia aut Geo-Marine Letters Springer-Verlag 27/5(2007-10-01), 315-323 0276-0460 27:5<315 2007 27 367 https://doi.org/10.1007/s00367-007-0055-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00367-007-0055-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Glasby Geoffrey Marine Geology Division, First Institute of Oceanography, SOA, 6 Xianxialing Road, 266061, Qingdao, China aut NATIONALLICENCE 700 1- Ren Xiangwen Marine Geology Division, First Institute of Oceanography, SOA, 6 Xianxialing Road, 266061, Qingdao, China aut NATIONALLICENCE 700 1- Shi Xuefa Marine Geology Division, First Institute of Oceanography, SOA, 6 Xianxialing Road, 266061, Qingdao, China aut NATIONALLICENCE 700 1- Pulyaeva Irina Northern Caucasus Academy of Federal Service, 47 Kirov Street, Pyatigorsk, Russia aut NATIONALLICENCE 773 0- Geo-Marine Letters Springer-Verlag 27/5(2007-10-01), 315-323 0276-0460 27:5<315 2007 27 367 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer