Next Article in Journal
Ore Genesis and Geodynamic Setting of Laochang Ag-Pb-Zn-Cu Deposit, Southern Sanjiang Tethys Metallogenic Belt, China: Constraints from Whole Rock Geochemistry, Trace Elements in Sphalerite, Zircon U-Pb Dating and Pb Isotopes
Next Article in Special Issue
Petrology of Chromitites in the Higashi-Akaishi Ultrahigh-Pressure (UHP) Peridotite Complex, Japan: Toward Understanding of General Features of the UHP Chromitites
Previous Article in Journal
Copper-Containing Magnesioferrite in Vesicular Trachyandesite in a Lava Tube from the 2012–2013 Eruption of the Tolbachik Volcano, Kamchatka, Russia
Previous Article in Special Issue
Decoding of Mantle Processes in the Mersin Ophiolite, Turkey, of End-Member Arc Type: Location of the Boninite Magma Generation
Open AccessArticle

Mantle Evolution from Ocean to Arc: The Record in Spinel Peridotite Xenoliths in Mt. Pinatubo, Philippines

1
National Institute of Geological Sciences, University of the Philippines, Diliman, Quezon City 1101, Philippines
2
Department of Earth Sciences, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
3
Department of Earth and Planetary Systems Science, Hiroshima University, Hiroshima 739-8526, Japan
4
Department of Earth System Science, Fukuoka University, Fukuoka 814-0180, Japan
5
Philippine Institute of Volcanology and Seismology, Diliman, Quezon City 1101, Philippines
*
Author to whom correspondence should be addressed.
Minerals 2018, 8(11), 515; https://doi.org/10.3390/min8110515
Received: 3 October 2018 / Revised: 1 November 2018 / Accepted: 5 November 2018 / Published: 8 November 2018
A suite of peridotite xenoliths were collected from lahar flow deposits located close to the summit of Mt. Pinatubo. Spinel harzburgite is the most dominant lithology among dunites, pyroxenites and websterites. A rare spinel lherzolite xenolith (P12-7) is also present in this suite. The spinel lherzolite has well-preserved protogranular texture with very minimal presence of secondary amphibole, low Cr# in the chromian spinel, and depleted and hump shaped patterns of chondrite-normalized rare earth element (REE) patterns for the clinopyroxenes. In contrast, the spinel harzburgites contain abundant secondary amphiboles and orthopyroxenes, higher Cr# in the spinel, and slightly elevated patterns for the chondrite-normalized REE patterns for the amphiboles. The spinel lherzolite also exhibits higher olivine Fo content for a given spinel Cr# compared to the spinel harzburgites. The spinel lherzolite is interpreted as a typical residue from partial melting of abyssal peridotites whereas the spinel harzburgites may have formed via partial melting with subsequent modification during the influx of fluids in the mantle wedge. Our results suggest that fragments of MOR-derived lithosphere exist in the mantle wedge beneath the Philippine island arc. This work provides evidence for the conversion of abyssal to arc peridotites in the mantle wedge. View Full-Text
Keywords: xenoliths; Mt. Pinatubo; Philippines; mantle wedge; abyssal lherzolite; arc harzburgite xenoliths; Mt. Pinatubo; Philippines; mantle wedge; abyssal lherzolite; arc harzburgite
Show Figures

Figure 1

MDPI and ACS Style

Payot, B.D.; Arai, S.; Yoshikawa, M.; Tamura, A.; Okuno, M.; Rivera, D.J.V. Mantle Evolution from Ocean to Arc: The Record in Spinel Peridotite Xenoliths in Mt. Pinatubo, Philippines. Minerals 2018, 8, 515.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop