Geochemical Data Comparison - Ocean Island Setting (DeBarba and Scheland, 2015)
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Title
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Geochemical Data Comparison - Ocean Island Setting (DeBarba and Scheland, 2015)
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Description
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The geochemical data from GeoRoc for the Hawaiian Islands and the Samoan Islands were used to create plots that reflect compositional trends in the data. For major elements such as Fe, Mg, Ca, Na, K, and Al the trends appear to have the same general habit. The Hawaiian Islands data set contains for far more data points compared to the Samoan Islands data set. This leaves the trend not as easily visible in the Samoan Islands plots (blue data) compared to the Hawaiian Islands plots (green data).
Different trends are visible when comparing the alkaline content of the two locales. The Samoan Islands appear to favor alkaline compositions, whereas the Hawaiian Islands, although spread across both alkaline and sub-alkaline, appear to favor the latter (pdf 8). This disparity is further investigated in the plots denominating tholeiitic and calc-alkaline (pdf. 9). The Hawaiian Islands plot indicates the compositions are spread across both compositions. The Samoan Islands are almost exclusively tholeiitic.
The levels of aluminum saturation at both settings appear to be very similar, but for a lack of similar size data sets. Thus, the Samoan Islands have a smaller range of aluminum saturation (pdf. 10).
The alkali, iron, magnesium ternary diagrams for both settings (pdf. 11) indicate that both settings had melt evolution. The Hawaiian Islands ternary diagram (on the left) shows compositions including calc-alkaline and the Samoan Islands (to the right) shows more tholeiitic heavy compositions.
The MORB normalized trace element trends are relatively similar to one another indicating that relative to a depleted mid ocean ridge both settings are similarly concentrated in incompatible trace elements.
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Subject
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Geochemical comparison between the Hawaiian Islands and Samoan Islands
https://exhibits.lafayette.edu/geology/files/original/9f77749452818f65223e27b72ba7efbf.pdf
https://exhibits.lafayette.edu/geology/files/original/5dae1c3b56407e385ddd541c41caf41c.pdf
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https://exhibits.lafayette.edu/geology/files/original/320e69e936d4a4e2583eb113d8b21319.pdf
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https://exhibits.lafayette.edu/geology/files/original/4335aa539e4c56eb1f00e65cfc350065.pdf
https://exhibits.lafayette.edu/geology/files/original/1fd1da9cb7fa40ad002abf338a1810be.pdf
https://exhibits.lafayette.edu/geology/files/original/6e42a60f9e8d371ab2304e9c9eca8566.pdf
https://exhibits.lafayette.edu/geology/files/original/5f2717e5da9e641842231b15fadbc950.pdf
https://exhibits.lafayette.edu/geology/files/original/aec41019f2d93975db208c145578f917.pdf
https://exhibits.lafayette.edu/geology/files/original/9d292bdf76e78eeba01bc81e1997fe7f.pdf
https://exhibits.lafayette.edu/geology/files/original/7ed17aa3d391aaacbe500d4712be564e.pdf