Low-temperature alteration and subsequent reheating of shallow oceanic crust at Hole 765D, Argo Abyssal Plain

K. M. Gillis, J. N. Ludden, T. Plank, L. D. Hoy

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Volcanic basement recovered at Hole 765D is characterized by nonpervasive, oxidative alteration, typical of seafloor weathering. Chilled margins and the mesostasis of the larvas are variably altered to assemblages of celadonite, Fe-oxyhydroxides, zeolites, and calcite with trace saponite. Plagioclase is partially altered to Ca-Na zeolites and/or albite. Well-devloped alteration halos parallel fracture surfaces and extend several centimeters into the surrounding rock. The "freshness' of the samples and the scarcity of saponite suggest that the duration of seawater circulation was short-lived. Albitization of plagioclase indicates that the volcanic rocks were altered initially at low temperatures and were subsequently reheated off-axis in a closed environment. Reheating did not result in significant modification of the bulk composition of the crust. -from Authors

Original languageEnglish
Title of host publicationArgo Abyssal Plain/Exmouth Plateau sites 765-766
PublisherTexas A&M University
Pages191-200
Number of pages10
DOIs
Publication statusPublished - Aug 1992

Publication series

NameProceedings of the Ocean Drilling Program, Scientific Results
Volume123
ISSN (Print)1096-7451

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Fingerprint Dive into the research topics of 'Low-temperature alteration and subsequent reheating of shallow oceanic crust at Hole 765D, Argo Abyssal Plain'. Together they form a unique fingerprint.

  • Cite this

    Gillis, K. M., Ludden, J. N., Plank, T., & Hoy, L. D. (1992). Low-temperature alteration and subsequent reheating of shallow oceanic crust at Hole 765D, Argo Abyssal Plain. In Argo Abyssal Plain/Exmouth Plateau sites 765-766 (pp. 191-200). (Proceedings of the Ocean Drilling Program, Scientific Results; Vol. 123). Texas A&M University. https://doi.org/10.2973/odp.proc.sr.123.157.1992