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- 저자 : Hans-Jurgen Brumsack (검색결과 1 건)
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Eun Young Lee,Maria Luisa G. Tejada,Insun Song,Seung Soo Chun,Susanne Gier,Laurent Riquier,Lloyd T. White,Bernhard Schnetger,Hans-Jurgen Brumsack,Matthew M. Jones,Mathieu Martinez 대한지질학회 2021 대한지질학회 학술대회 Vol.2021 No.10
This study investigates the linkages between physical properties, primary lithology, and alteration processes of a volcanic sequence at Site U1513 on the Naturaliste Plateau, offshore southwest Australia. The volcanic eruption and emplacement occurred in subaerial to shallow water setting on the rifted continental margin during the Early Cretaceous. The volcanic sequence consists of alternating basalt flows and volcaniclastic deposits, intruded by multiple dolerite dikes. We compile a variety of petrophysical data and correlate these with lithologic, mineralogical, and geochemical analyses (e.g., XRD, XRF), acquired during and after the International Ocean Discovery Program (IODP) Expedition 369. Variable alteration intensities from fresh-slight to strong are evaluated using Chemical Index of Alteration, alteration mineralogy, and textural changes. Intervals of fresh-slightly altered dikes exhibit low porosity (~13%) and high values of bulk density (~2.7 g/cm³), P-wave velocity (~4900 m/s) and thermal conductivity (~1.7 W/(m·K)). The increase of alteration intensity corresponds to decreases in bulk density to ~2 g/cm³, P-wave velocity to ~2000 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 physical variations exhibit a good correlation with primary lithologic characteristics as well as secondary mineralogical and textural changes attributed to alteration processes by subaerial exposure, seawater interaction and hydrothermal activities. Synthesis models of petrophysical variation with alteration intensity are provided for future studies. Although limitations and uncertainties are introduced due to differences in primary lithology, alteration type, and petrophysical methodology, there is a reasonable applicability of our results to rapidly characterize the alteration intensity and volcanic stratigraphy in volcanic sequences. Our results can be used to develop strategies better for exploration, drilling, and geophysical research of volcanic terrains.
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