Blog
About

0
views
0
recommends
+1 Recommend
1 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: not found

      Reef-flat and back-reef development in the Great Barrier Reef caused by rapid sea-level fall during the Last Glacial Maximum (30–17 ka)

      Read this article at

      ScienceOpenPublisher
      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          Reef growth patterns and the development of associated environments have been extensively studied from reef deposits from Holocene and previous interglacial highstands. However, reefs that grew during glacial lowstands are comparatively poorly understood. Here we show the formation of reef-flat and back-reef environments following rapid sea-level fall (15–20 mm yr−1 and 20–40 m in magnitude) during the Last Glacial Maximum (LGM) on the present shelf edge of the Great Barrier Reef. Sedimentological and foraminiferal analyses of unconsolidated reef sediments recovered in cores 111–140 m below sea level at Hydrographers Passage during Integrated Ocean Drilling Project (IODP) Expedition 325 reveal the occurrence of a benthic foraminiferal assemblage dominated by the genera Calcarina and Baculogypsina, which is common in modern reef-flat and back-reef environments in the Great Barrier Reef and elsewhere. This assemblage is associated with higher foraminiferal proportions in reef sediments and higher proportions of well-preserved Baculogypsina tests in the same intervals, which also characterize reef-flat environments. Radiocarbon (14C–accelerator mass spectrometry) ages of reef-flat dwelling foraminifers (n = 22), which indicate the time when these foraminifers were alive, are consistent with the timing of the two-step sea-level fall into the LGM as defined by the previously published well-dated coralgal record. This foraminiferal evidence suggests the development of geomorphically mature fringing reefs with shallow back-reef lagoons during the LGM. Our results also imply that back-reef sediment accumulation rates during the LGM lowstand were comparable to those during the Holocene highstand.

          Related collections

          Most cited references 25

          • Record: found
          • Abstract: not found
          • Article: not found

          Fringing reef growth and morphology: a review

            Bookmark
            • Record: found
            • Abstract: not found
            • Article: not found

            Importance of foraminifera for the formation and maintenance of a coral sand cay: Green Island, Australia

             H Yamano,  T Miyajima,  I Koike (2000)
              Bookmark
              • Record: found
              • Abstract: not found
              • Article: not found

              Reef response to sea-level and environmental changes during the last deglaciation: Integrated Ocean Drilling Program Expedition 310, Tahiti Sea Level

               E Bard,  N. Durand,  Y. Iryu (2012)
                Bookmark

                Author and article information

                Journal
                Geology
                Geological Society of America
                0091-7613
                1943-2682
                October 28 2019
                January 01 2020
                October 28 2019
                January 01 2020
                : 48
                : 1
                : 39-43
                Affiliations
                [1 ]Department of Physics and Earth Sciences, Faculty of Science, and Tropical Biosphere Research Center, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903-0213, Japan
                [2 ]Physics and Earth Sciences Course, Graduate School of Engineering and Science, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903-0213, Japan
                [3 ]Graduate School of Integrated Sciences for Global Society, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
                [4 ]Atmosphere and Ocean Research Institute, and Department of Earth and Planetary Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8564, Japan
                [5 ]Geocoastal Research Group, School of Geosciences, The University of Sydney, Sydney, New South Wales 2006, Australia
                Article
                10.1130/G46792.1
                © 2020

                Comments

                Comment on this article