Kano, Akihiro; Ferdelman, Timothy G.; Williams, Trevor; Henriet, Jean-Pierre; Ishikawa, Tsuyoshi; Kawagoe, Noriko; Takashima, Chiduru; Kakizaki, Yoshihiro; Abe, Kohei; Sakai, Saburo; Browning, Emily L.; Li Xianghui; Andres, M. S.; Bjerager, M.; Cragg, B. A.; de Mol, B.; Dorschel, B.; Foubert, A.; Frank, T. D.; Fuwa, Y.; Gaillot, P.; Gharib, J. J.; Gregg, J. M.; Huvenne, V. A. I.; Leonide, P.; Mangelsdorf, K.; Monteys, X.; Novosel, I.; O'Donnell, R.; Rueggeberg, A.; Samarkin, V.; Sasaki, K.; Spivack, A. J.; Tanaka, A.; Titschack, J.; van Rooij, D.; Wheeler, A. (2007): Age constraints on the origin and growth history of a deep-water coral mound in the Northeast Atlantic drilled during Integrated Ocean Drilling Program Expedition 307. Geological Society of America (GSA), Boulder, CO, United States, Geology (Boulder), 35 (11), 1051-1054, georefid:2007-128475

Abstract:
Sr isotope stratigraphy provides a new age model for the first complete section drilled through a deep-water coral mound. The 155-m-long section from Challenger Mound in the Porcupine Sea-bight, southwest of Ireland, is on Miocene siliciclastics and consists entirely of sediments bearing well-preserved cold-water coral Lophelia pertusa. The (super 87) Sr/ (super 86) Sr values of 28 coral specimens from the mound show an upward-increasing trend, correspond to ages from 2.6 to 0.5 Ma, and identify a significant hiatus from ca. 1.7 to 1.0 Ma at 23.6 m below seafloor. The age of the basal mound sediments coincides with the intensification of Northern Hemisphere glaciations that set up the modern stratification of the northeast Atlantic and enabled coral growth. Mound growth persisted throughout glacial-interglacial fluctuations, reached a maximum rate (24 cm/k.y.) ca. 2.0 Ma, and ceased at 1.7 Ma. Unlike other buried mounds in Porcupine Seabight, Challenger Mound was only partly covered during its growth interruption, and growth restarted ca. 1.0 Ma.
Coverage:
West: -11.4400 East: -11.3300 North: 51.2600 South: 51.2300
Relations:
Expedition: 307
Site: 307-U1316
Site: 307-U1317
Site: 307-U1318
Supplemental Information:
With GSA Data Repository Item 2007255
Data access:
Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=10.1130/G23917A.1 (c.f. for more detailed metadata)
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