The minor and trace element geochemistry of volcanic rocks from Truk, Ponape and Kusaie, eastern Caroline Islands; the evolution of a young hot spot trace across old Pacific Ocean crust

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Authors:Mattey, D. P.
Author Affiliations:Primary:
Univ. Hawaii, Hawaii Inst. Geophys., Honolulu, HI 96822, United States
Volume Title:Contributions to Mineralogy and Petrology
Source:Contributions to Mineralogy and Petrology, 80(1), p.1-13. Publisher: Springer International, Heidelberg-New York, International. ISSN: 0010-7999
Publication Date:1982
Note:In English. 43 refs.; illus. incl. 29 anal., 1 table, geol. sketch map, chart
Summary:Recent palaeomagnetic and K/Ar age-dating studies in the Caroline Islands show that the high volcanic islands of Truk, Panape and Kusaie formed at the same shallow latitude and display a progression of ages increasing westward from 1 m.y. (Kusaie), through 6 m.y. (Ponape) to 12 m.y. (Truk). These data suggest that the islands were formed by a young hotspot or melting anomaly. Volcanic rocks (150) from these three islands were analysed for major and trace elements; the results indicate that shield-building lavas on each island evolved by low-P open-system fractional crystallization of a small range of partial melts, and became more alkaline with time from Truk to Kusaie. The secular chemical variation along the Caroline chain may represent a hotspot trace whose magma production was slowly declining over the past 14 m.y. [P.Br.]
Subjects:Alkali basalts; Ankaramite; Basalts; Basanite; Correlation; Differentiation; Fractional crystallization; Genesis; Geochemistry; Hawaiite; Igneous rocks; Magmas; Minor elements; Mugearite; Nephelinite; Oceanite; Partial melting; Petrology; Spectra; Stratovolcanoes; Trace elements; Trachytes; Ultramafic composition; Volcanic rocks; Volcanoes; X-ray fluorescence spectra; Caroline Islands; Micronesia; Oceania; Kusaie; Ponape; Ratios; Truk
Coordinates:N050000 N080000 E1700000 E1500000
Abstract Numbers:83M/1610
Record ID:1985080258
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique
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