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Bryan, Wilfred B; Pearce, Thomas H (1994): Geochemistry of minerals from lavas of ODP Leg 135 holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.793441, Supplement to: Bryan, WB; Pearce, TH (1994): Plagioclase zoning in selected lavas from Holes 834B, 839B, and 841B. In: Hawkins, J; Parson, L; Allan, J; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 135, 543-556, https://doi.org/10.2973/odp.proc.sr.135.132.1994

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Abstract:
We use Nomarski differential interference contrast imaging to reveal the wealth of complex detail in plagioclase zoning for selected samples from Sites 834, 839, and 841. All sites contain some plagioclase with the very complex internal core zoning, convolute zoning, or very fine-scale euhedral oscillatory zoning of the sort generally considered typical of island-arc volcanic rocks. Plagioclase with contrasted zoning styles may coexist within a single lithologic unit or even within a single thin section. Especially notable is the presence of scattered plagioclase phenocrysts with complex zoning throughout Unit 7 in Hole 834B, which in other respects is relatively uniform in composition and appears to have had little or no differential sorting of crystals and liquid.
Although our study is by no means comprehensive, it is sufficient to indicate that magmatic conditions have been variable during crystallization of these rocks, and mixing or at least minor contamination may be required to explain some of the relations observed. By analogy with experimental studies, it is possible that variations in water content, either over time or within different parts of a chamber or conduit system, have contributed to the observed contrasts in zoning.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -19.762500 * Median Longitude: -177.220750 * South-bound Latitude: -23.346000 * West-bound Longitude: -177.862000 * North-bound Latitude: -18.568000 * East-bound Longitude: -175.297000
Date/Time Start: 1990-12-23T20:39:00 * Date/Time End: 1991-02-10T20:30:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Bryan, WB; Pearce, TH (1994): (Table 3) Geochemistry of olivine in ODP Hole 135-834B Unit 7. https://doi.org/10.1594/PANGAEA.793439
  2. Bryan, WB; Pearce, TH (1994): (Table 2) Geochemistry of plagioclase in ODP Hole 135-834B Unit 7. https://doi.org/10.1594/PANGAEA.793438
  3. Bryan, WB; Pearce, TH (1994): (Table 4) Geochemistry of spinel in ODP Hole 135-834B Unit 7. https://doi.org/10.1594/PANGAEA.793440
  4. Bryan, WB; Pearce, TH (1994): (Table 1) Geochemistry of large-zone plagioclase phenocrysts in ODP Hole 135-841B Miocene andesite Unit 1A. https://doi.org/10.1594/PANGAEA.793437