NDLI: Geochemical characteristics of hydrous basaltic magmas due to assimilation and fractional crystallization: the Ikoma gabbroic complex, southwest Japan

Content Provider	Springer Nature Link
Author	Koizumi, N. Okudaira, T. Ogawa, D. Yamashita, K. Suda, Y.
Copyright Year	2016
Abstract	To clarify the processes that occur in hydrous basaltic magma chambers, we have undertaken detailed petrological and geochemical analyses of mafic and intermediate rocks from the Ikoma gabbroic complex, southwest Japan. The complex consists mainly of hornblende gabbros, hornblende gabbronorites, and hornblende leucogabbros. The hornblende leucogabbros are characterized by low TiO2 and high CaO contents, whereas the hornblende gabbronorites have high TiO2 and low CaO contents. The initial 87Sr/86Sr ratios (SrI) of the hornblende gabbronorites and hornblende gabbros are higher than those of the hornblende leucogabbros and plagioclase, and they may have resulted from a higher degree of assimilation of metasediments. The geochemical features of the hornblende leucogabbros and hornblende gabbronorites can be explained by accumulation of plagioclase and ilmenite, respectively, in a hybrid magma that formed by chemical interaction between mafic magma and metasediment, whereas the hornblende gabbros were produced by a high degree of crustal assimilation and fractional crystallization of this hybrid magma. As a result of the density differences between crystals and melt, the Ikoma gabbroic rocks formed by the accumulation of plagioclase in the middle of the magma chamber and by the accumulation of ilmenite in the bottom of the chamber. Taking into account the subsequent assimilation and fractional crystallization, our observations suggest an enriched mantle (SrI = ~0.7071) as the source material for the Ikoma gabbros.
Starting Page	639
Ending Page	662
Page Count	24
File Format	PDF
ISSN	09300708
Journal	Mineralogy and Petrology
Volume Number	110
Issue Number	5
e-ISSN	14381168
Language	English
Publisher	Springer Vienna
Publisher Date	2016-02-10
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mineralogy Inorganic Chemistry Geochemistry
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Fractional crystallization of hydrous basaltic “arc-type” magmas and the formation of amphibole-bearing gabbroic cumulates

Fractional crystallization of primitive, hydrous arc magmas: an experimental study at 0.7 GPa

Geochemical aspects of the assimilation of host rocks by basaltic magmas during the formation of Noril’sk Cu-Ni ores

Limestone assimilation by basaltic magmas: an experimental re-assessment and application to Italian volcanoes

A mathematical model of trace element and isotopic behavior during simultaneous assimilation and imperfect fractional crystallization

Evidence for extreme fractionation of peralkaline silicic magmas, the Boseti volcanic complex, Main Ethiopian Rift

Large vesicles record pathways of degassing at basaltic volcanoes

Experimental modeling of the explosion mechanism of basaltic magmas

Crystallization of quartz dioritic magmas at 2 and 1 kbar: experimental results

Geochemical characteristics of hydrous basaltic magmas due to assimilation and fractional crystallization: the Ikoma gabbroic complex, southwest Japan

Similar Documents

Fractional crystallization of hydrous basaltic “arc-type” magmas and the formation of amphibole-bearing gabbroic cumulates

Fractional crystallization of primitive, hydrous arc magmas: an experimental study at 0.7 GPa

Geochemical aspects of the assimilation of host rocks by basaltic magmas during the formation of Noril’sk Cu-Ni ores

Limestone assimilation by basaltic magmas: an experimental re-assessment and application to Italian volcanoes

A mathematical model of trace element and isotopic behavior during simultaneous assimilation and imperfect fractional crystallization

Evidence for extreme fractionation of peralkaline silicic magmas, the Boseti volcanic complex, Main Ethiopian Rift

Large vesicles record pathways of degassing at basaltic volcanoes

Experimental modeling of the explosion mechanism of basaltic magmas

Crystallization of quartz dioritic magmas at 2 and 1 kbar: experimental results

Geochemical characteristics of hydrous basaltic magmas due to assimilation and fractional crystallization: the Ikoma gabbroic complex, southwest Japan