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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

¹ Hiroshima University, Kagamiyama 1-3-1, Higashi-hiroshima 739-8526, Japan
² Max-Planck-Institute for Marine Microbiology, Celslusstrasse 1, D-28359 Bremen, Germany
³ Lamont-Doherty Earth Observatory, 61 Route 9W, Palisades, New York 10964, USA
⁴ Universiteit Gent, Krijgslaan 281-S8, 9000 Ghent, Belgium
⁵ Japan Agency for Marine-Earth Science and Technology, Monobeotsu 200, Nankoku, 783-8502, Japan
⁶ Hiroshima University, Kagamiyama 1-3-1, Higashi-hiroshima 739-8526, Japan
⁷ University of Tsukuba, Tennodai 1-1-1, Tsukuba 305-8572, Japan
⁸ Japan Agency for Marine-Earth Science and Technology, Natsushima 2-15, Yokosuka, 237-0061, Japan
⁹ University of Massachusetts, 611 North Pleasant Street, Amherst, Massachusetts 02125-3393, USA
¹⁰ Chengdu University of Technology, Chengdu, 610059, Peoples Republic of China

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 ⁸⁷Sr/⁸⁶Sr 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.

Key Words: deep-water coral mound • northeast Atlantic • Porcupine Sea-bight • ⁸⁷Sr/⁸⁶Sr • Pliocene-Pleistocene • Integrated Ocean Drilling Program

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