Alteration of basalts from Sites U1346 and U1349 at Shatsky Rise oceanic plateau, IODP Expedition 324

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doi: 10.2204/iodp.proc.324.203.2013
Author(s): Delacour, Adélie; Guillaume, Damien
Integrated Ocean Drilling Program, Expedition 324 Scientists, College Station, TX
Author Affiliation(s): Primary:
Observatoire Midi-Pyrénées, Géosciences Environnemtns Toulose, Toulouse, France
Other:
National Museum of Nature and Science, Japan
Lamont-Doherty Earth Observatory, United States
University of Hanover, Germany
Pusan National University, South Korea
Université Pierre et Marie Curie, France
Université Paul Sabatier, France
University of Hawaii at Manoa, United States
University of Rhode Island, United States
Eidgenössische Technische Hochschule Zürich, Switzerland
Leibniz Institute of Marine Sciences, Germany
Tohoku University, Japan
Japan Agency of Marine-Earth Science and Technology, Japan
Korea Institute of Geosciences and Mineral Resources, South Korea
Oregon State University, United States
Ocean University of China, China
University College London, United Kingdom
Ibaraki University, Japan
Kyoto University, Japan
Queensland University of Technology, Australia
University of Miami, United States
Doshisha University, Japan
University of Oxford, United Kingdom
Woods Hole Oceanography Institution, United States
Open University, United Kingdom
Volume Title: Proceedings of the Integrated Ocean Drilling Program; Shatsky Rise Formation; Expedition 324 of the riserless drilling platform, Yokohama, Japan, to Townsville, Australia; Sites U1346-U1350, 4 September-3 November 2009
Volume Author(s): Sager, William W.; Sano, Takashi; Geldmacher, Jorg; Iturrino, Gerardo; Evans, Helen; Almeev, Renat; Ando, Atsushi; Carvallo, Claire; Delacour, Adélie; Greene, Andrew R.; Harris, Amber C.; Herrmann, Sandra; Heydolph, Ken; Hirano, Naoto; Ishikawa, Akira; Kang, Moo-Hee; Koppers, Anthony A. P.; Li Sanzhong; Littler, Kate; Mahoney, John; Matsubara, Noritaka; Miyoshi, Masaya; Murphy, David T.; Natland, James H.; Ooga, Masahiro; Prytulak, Julie; Shimizu, Kenji; Tominaga, Masako; Widdowson, Mike; Woodward, Stella C.
Source: Proceedings of the Integrated Ocean Drilling Program; Shatsky Rise Formation; Expedition 324 of the riserless drilling platform, Yokohama, Japan, to Townsville, Australia; Sites U1346-U1350, 4 September-3 November 2009, William W. Sager, Takashi Sano, Jorg Geldmacher, Gerardo Iturrino, Helen Evans, Renat Almeev, Atsushi Ando, Claire Carvallo, Adélie Delacour, Andrew R. Greene, Amber C. Harris, Sandra Herrmann, Ken Heydolph, Naoto Hirano, Akira Ishikawa, Moo-Hee Kang, Anthony A. P. Koppers, Li Sanzhong, Kate Littler, John Mahoney, Noritaka Matsubara, Masaya Miyoshi, David T. Murphy, James H. Natland, Masahiro Ooga, Julie Prytulak, Kenji Shimizu, Masako Tominaga, Mike Widdowson and Stella C. Woodward; Integrated Ocean Drilling Program, Expedition 324 Scientists, College Station, TX. Proceedings of the Integrated Ocean Drilling Program (Online), Vol.324, 12p. Publisher: IODP Management International, Washington, DC, United States. ISSN: 1930-1014
Note: In English. 18 refs.; illus., incl. 1 table
Summary: This paper presents alteration mineralogy of basalts from Sites U1346 and U1349 drilled during Integrated Ocean Drilling Program (IODP) Expedition 324 on Shatsky Rise oceanic plateau. These two sites are the more altered sites among the four basaltic sites drilled on the plateau and show the greatest variability in terms of alteration. X-ray diffraction (XRD) analyses were processed on nonoriented bulk rock powders and on oriented sections made after decarbonation of the <2 µm fraction of basalts, sampled at regular intervals from Holes U1346A and U1349A. These XRD analyses allow us to determine the nature and composition of clay minerals that predominantly replace primary mineralogy of the basalts and to evaluate the spatial variations in alteration conditions: lateral variations within the plateau and vertical variations within a single site. Alteration types differ between the two holes and include green alteration, brown alteration, and dark gray alteration in Hole U1346A, whereas Hole U1349A is characterized by red-brown alteration, a transition zone, and green alteration that differs significantly from that in Hole U1346A. Secondary mineral assemblages include smectites, calcite, kaolinite, illite, chlorite, zeolites, sulfides, Fe oxides (i.e., hematite), and Fe oxyhydroxides. These parageneses attest that basaltic rocks from the two sites were affected by low- to moderate- temperature alteration. Alteration at Shatsky Rise oceanic plateau is similar, although some differences occur, to that reported at oceanic plateaus (e.g., Ontong Java) and oceanic crust drilled during the Deep Sea Drilling Program and Ocean Drilling Program.
Year of Publication: 2013
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 05 Petrology, Igneous and Metamorphic; Basalts; Boreholes; Clay minerals; Cores; Crust; Expedition 324; IODP Site U1346; IODP Site U1349; Igneous rocks; Integrated Ocean Drilling Program; Mineral assemblages; Mineral composition; North Pacific; Northwest Pacific; Oceanic crust; Pacific Ocean; Secondary minerals; Shatsky Rise; Sheet silicates; Silicates; Volcanic rocks; West Pacific; X-ray diffraction data
Coordinates: N380024 N380024 E1623843 E1623843
N360657 N360657 E1582730 E1582730
Record ID: 2013043427
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