Geochemical Data - Aleutian Arc
Item
-
Title
-
Geochemical Data - Aleutian Arc
-
Description
-
Convergent margins are the type locality for calc-alkaline melts, but are also the magmatic setting for nearly any other magma compositional series. The melt is sourced by the mantle wedge and evolves differently depending on how developed the overlying arc is. A mature arc will provide more evolved surrounding rock to assimilate into rising melts. This can alter the composition of melts to variable degrees depending on how high a thermal budget a rising melt has. Melts at arcs are also susceptible to the room problem. The result is stalling and potentially fractionation or other diversification processes. The geochemical trends discernible in major and trace element diagrams when compared to increasing silica content can inform upon the compositional character of the rocks produced by melts at the locality in question. The Aleutian Arc data set from GeoRoc encompasses a large set of samples and their whole rock geochemistry. Samples from along the entirety of the arc were used to best depict the overall character of the setting.
The data reveals that the melts produced at the Aleutian Arc are generally calc-alkaline in nature. This statement is supported by the trends in the geochemical plots and their significance which is discussed in the caption of each plot.
-
Subject
-
An interpretation of trends found in geochemical data for the Aleutian Arc convergent margin.
-
Creator
-
Cullen Scheland
-
Source
-
Data: GeoRoc
https://exhibits.lafayette.edu/geology/files/original/5354d8b5e7ef01b37d8343201d80f38f.pdf
https://exhibits.lafayette.edu/geology/files/original/ff3e5935bd252085a36916d98641f103.pdf
https://exhibits.lafayette.edu/geology/files/original/7282cbf455f38947010f08c2dddedf10.pdf
https://exhibits.lafayette.edu/geology/files/original/88a2632f632abf6fe95c316db81853ae.pdf
https://exhibits.lafayette.edu/geology/files/original/6fec5bcbef5bdbed87d5e0c6f8e95389.pdf
https://exhibits.lafayette.edu/geology/files/original/94c732d2dc6a0f520e157bc4f3381204.pdf