Skip to content

Intense hurricane transports sand onshore: Example from the Pliocene Malbusca section on Santa Maria Island (Azores, Portugal)

Research output: Contribution to journalLetter

Original languageEnglish
Pages (from-to)244-249
Number of pages6
JournalMarine Geology
Volume385
Early online date4 Feb 2017
DOIs
DateAccepted/In press - 2 Feb 2017
DateE-pub ahead of print - 4 Feb 2017
DatePublished (current) - 1 Mar 2017

Abstract

Southern cliffs on Santa Maria Island in the Azores archipelago (North Atlantic Ocean) feature submarine volcanic sequences inter-bedded with Pliocene coralline algal limestone, shelly coquinas, and mixed volcaniclastic-calcarenite sandstone. Within the 20-m sedimentary succession at Malbusca, a singular, 5-m sandstone bed is distinguished by dark and light laminae dominated alternately by heavy minerals and carbonate detritus. Carbonate grain-size varies between that of coarse silt and very fine sand. The basal part shows coarser and more poorly sorted sand in an upward transition to increasingly finer carbonates. Accessible over a lateral space of 34 m, the big bed is shouldered against and overlaps the remnants of a drowned rocky shore with a paleorelief of 4 m that preserves intertidal to shallow subtidal biotas. Extrapolated from the big bed's rock face (1830 m2) and the width of the eroded shelf on which it resides (8 m), calculations yield a projected volume of 14,500 m3. Unique to the island, the big bed is interpreted as a major hurricane deposit that moved sand from an offshore bar in an onshore path. Such an event fits the context of the Pliocene Warm Period, during which global El Niño conditions were more intense than today.

    Research areas

  • Storm surge, NE Atlantic, Azores Islands, El Niño climate, Pliocene Warm Period

Download statistics

No data available

Documents

Documents

  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Elsevier at http://www.sciencedirect.com/science/article/pii/S0025322716302626. Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 1 MB, PDF document

    Licence: CC BY-NC-ND

DOI

View research connections

Related faculties, schools or groups