Please login first
Petrophysical characteristics of hydrothermally altered volcaniclastic-rich sedimentary rocks on the Naturaliste Plateau, offshore southwestern Australia (IODP Site U1513)
* 1 , 2 , 3 , 4 , 5 , 6 , 6
1  Department of Geology, University of Vienna, 1090 Vienna, Austria
2  Institut des Sciences de la Terre de Paris (ISTeP), Sorbonne University, 75005 Paris, France,
3  Institute for Marine Geodynamics (IMG), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Kanagawa, 237-0061, Japan
4  Faculty of Earth Systems and Environmental Sciences, Chonnam National University, Gwangju 61186, Republic of Korea
5  GeoQuEST Research Centre, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, NSW 2522, Australia
6  Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, 26129 Oldenburg, Germany
Academic Editor: Angelos G. Maravelis


Drilling at Site U1513 recovered the Lower Cretaceous volcaniclastic-rich sedimentary sequence on the Naturaliste Plateau and Mentelle Basin, offshore southwestern Australia. The sequence exhibits distinct lithologic characteristics, attributed to volcanism and subsidence occurred during the breakup between Greater India and Australia-Antarctica. It consists of sandstones, siltstones, and silty claystones with abundant volcanic clasts, lithics, and hydrothermal alteration. This study characterizes petrophysical properties of the sequence and correlate them with lithologic and mineralogical features. The properties show noticeable variations. Our results confirm that the petrophysical characteristics are associated with grain size, volcanic matter, organic content, as well as hydrothermal alteration minerals.

Keywords: volcaniclastic-rich sequence; IODP Site U1513; petrophysical properties; hydrothermal alteration; calcite cementation; Naturaliste Plateau; Mentelle Basin; southwest Australia; East Gondwana breakup; Early Cretaceous