Haraguchi, Satoru et al. (2012): The early Miocene ( approximately 25 Ma) volcanism in the northern Kyushu-Palau Ridge, enriched mantle source injection during rifting prior to the Shikoku back-arc basin opening
Leg/Site/Hole:
Related Expeditions:
ODP 126
Identifier:
ID:
2012-047433
Type:
georefid
ID:
10.1007/s00410-011-0680-x
Type:
doi
Creator:
Name:
Haraguchi, Satoru
Affiliation:
University of Tokyo, Atmosphere and Ocean Research Institute, Kashiwa, Japan
Role:
author
Name:
Ishii, Teruaki
Affiliation:
Fukada Geological Institute, Japan
Role:
author
Name:
Kimura, Jun-Ichi
Affiliation:
Japan Agency for Marine Earth Science and Technology, Japan
Role:
author
Name:
Kato, Yasuhiro
Affiliation:
Role:
author
Identification:
Title:
The early Miocene ( approximately 25 Ma) volcanism in the northern Kyushu-Palau Ridge, enriched mantle source injection during rifting prior to the Shikoku back-arc basin opening
Year:
2012
Source:
Contributions to Mineralogy and Petrology
Publisher:
Springer International, Heidelberg - New York, International
Volume:
163
Issue:
3
Pages:
483-504
Abstract:
The northern Kyushu-Palau Ridge (KPR), remnant conjugate arc of the Izu-Ogasawara (Bonin)-Mariana (IBM) active arc, is dominated by basalt-andesite except for the Komahashi-Daini Seamount where acidic plutonic rocks of 38 Ma were recovered. These mafic to intermediate volcanics are produced by the rifting volcanism in the proto-IBM arc associated with spreading of the Shikoku Basin. The HFSE and HREE contents and ratios of these volcanics indicate enriched source mantle composition compared to recent volcanic front. The LILE ratios exhibit similar characteristics to reararc volcanism of the recent Izu arc, and some enriched volcanics exhibit high abundance of sediment melt inputs. Based on these observations and compilations of the published data set, the replacement event of the wedge mantle under the IBM arc occurred two times. The first event occurred between 45 and 38 Ma, with Pacific type mantle being replaced by depleted Indian type mantle. The second event occurred between 36 and 25 Ma, enriched mantle flowed from reararc side. The slab component during the proto-IBM arc rifting was a similar characteristic to recent reararc volcanism of the Izu arc, and sediment melt added in a local area. Copyright 2011 Springer-Verlag
Language:
English
Genre:
Serial
Rights:
URL:
Coverage: Geographic coordinates: North:31.0621 West:134.0000 East:
140.5217 South:11.0000
Keywords: Igneous and metamorphic petrology; Solid-earth geophysics; andesites; back-arc basins; basalts; basins; Cenozoic; chemical composition; enrichment; geochemistry; ICP mass spectra; igneous rocks; Izu-Bonin Arc; Komahashi-Daini Seamount; Kyushu-Palau Ridge; Leg 126; lithophile elements; lithosphere; lower Miocene; major elements; mantle; mantle wedges; mass spectra; metasomatism; mid-ocean ridge basalts; Miocene; Neogene; North Pacific; Northwest Pacific; Ocean Drilling Program; ocean floors; oceanic lithosphere; ODP Site 793; Pacific Ocean; Parece Vela Basin; petrology; Philippine Sea; Philippine Sea Plate; plate tectonics; plutonic rocks; rift zones; rifting; sea-floor spreading; seamounts; Shikoku Basin; spectra; spreading centers; Tertiary; trace elements; volcanic rocks; volcanism; West Pacific; X-ray fluorescence spectra;
.