Petrophysical Property Modifications by Alteration in a Volcanic Sequence at IODP Site U1513, Naturaliste Plateau
- Author(s)
- Eun Young Lee, Maria Luisa G. Tejada, Insun Song, Seung Soo Chun, Susanne Gier, Laurent Riquier, Lloyd T. White, Bernhard Schnetger, Hans‐Jürgen Brumsack, Matthew M. Jones, Mathieu Martinez
- Abstract
Petrophysical properties of volcanic rocks are controlled by lithology and subsequent modification by alteration processes. Investigating the linkages, using a range of different techniques, are important to establish how petrophysical properties can inform about the alteration state of volcanic rocks. Here, we compile petrophysical data and correlate these with geochemical and mineralogical analyses acquired from a volcanic sequence on the Naturaliste Plateau, offshore southwest Australia (International Ocean Discovery Program Site U1513). The sequence consists of alternating basalt lava flows and volcaniclastic deposits, intruded by multiple dolerite dikes. Variable alteration intensities from fresh-slight to strong are quantified using Chemical Index of Alteration. Intervals of slightly altered dikes exhibit low porosity and high values of bulk density, P-wave velocity, and thermal conductivity. The increase of alteration intensity corresponds to decreases in bulk density to ∼2 g/cm3, P-wave velocity to ∼2,000 m/s, thermal conductivity to ∼1.2 W/(m·K) and an increase in porosity up to 50%. Natural Gamma Ray and magnetic susceptibility vary downhole with rock composition and at lithologic boundaries. The distinct variations exhibit a good correlation with primary lithologic characteristics and secondary mineralogical and textural changes attributed to alteration processes. We provide synthesis models of petrophysical variation with alteration intensity. Although differences in primary lithology and alteration type introduce limitations and uncertainties, there is a reasonable applicability of our results to rapidly characterize the alteration intensity and volcanic stratigraphy in volcanic sequences and to calibrate wireline log-based determinations. This will help others to develop strategies for exploration, drilling, and geophysical research of volcanic rocks.
- Organisation(s)
- Department of Geology
- External organisation(s)
- Chonnam National University, Japan Agency for Marine-Earth Science and Technology, Korea Institute of Geoscience and Mineral Resources, Université Paris IV - Paris-Sorbonne, University of Wollongong, Carl von Ossietzky Universität Oldenburg, University of Michigan, Université Rennes-I
- Journal
- Journal of Geophysical Research: Solid Earth
- Volume
- 126
- No. of pages
- 27
- ISSN
- 2169-9313
- DOI
- https://doi.org/10.1029/2020JB021061
- Publication date
- 10-2021
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 105120 Petrology, 105125 Petrophysics
- Keywords
- ASJC Scopus subject areas
- Geochemistry and Petrology, Geophysics, Earth and Planetary Sciences (miscellaneous), Space and Planetary Science
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/558f2cdd-6748-428b-8826-ae441a61d2e7