Plagioclase of Hawaiian tholeiitic and alkalic magma parentages: disctinctions based on REE, Sr, Hf, and Ta

Author:

Fodor, R.V.

Title:

Plagioclase of Hawaiian tholeiitic and alkalic magma parentages: disctinctions based on REE, Sr, Hf, and Ta

Periodical:

Mineralogy and Petrology

Year:

2000

Volume:

69

Pages:

213-225

Subject:

Mauna Kea volcano Lava analysis Gabbro

Summary:

Understanding whether mineral compositions represent tholeiitic or alkalic magmatism is useful for establishing magma parentage when lava compositions are ambiguous and when evaluating cumulate gabbros and (magma) xenocrysts and studies of phenocrysts in Hawaiian tholeiitic and alkalic lavas have established some reasonably good parameters for distinguishing whether clinopyroxene and plagioclase crystallized from tholeiitic or alkalic magmas. In an effort to enhance the ability to distinguish tholeiitic from alkalic magma parentages by mineral compositions, this author determined trace-element abundances in plagioclase separated from xenolithic gabbros of Mauna Kea volcano that have origins in tholeiitic and alkalic magmas of the Hamakua postshield stage of Mauna Kea volcanism.

Label:

Geology

URL:

http://cletus.uhh.hawaii.edu:2074/10.1007/s007100070022

Collection:

Periodicals