Spinel inclusions in olivine and plagioclase crystals in a layered gabbro: a marker and a tracer for primary phenocrysts in a differentiating magma reservoir (original) (raw)
Abstract
The problem of whether cumulate rocks were formed by crystal settling or by in situ crystallization after magma emplacement is an important issue concerning the mechanisms of magmatic differentiation. However, it is hard to distinguish these two processes for plutonic rocks because the primary texture and chemical composition have generally been modified by postcumulus processes. To contribute this problem, we studied the distribution and compositions of Cr-spinel inclusions hosted in olivine and plagioclase in the Murotomisaki Gabbroic Intrusion (MGI), SW Japan. It is shown that the olivine-hosted inclusions are restricted to specific horizons where accumulation of olivine phenocrysts is thought to have occurred and that the compositional variations of the Cr-spinel are explained by a secondary compositional modification that probably took place after the magma emplacement. It is also shown that the Cr-spinel inclusions in a chilled margin have suffered the least compositional modification and nearly retains the primary composition. Those in the interior of the intrusion, on the contrary, have been significantly modified by re-equilibration with residual melt driven by cation diffusions through the host phases. Those in plagioclase have been less modified. It is shown that all the spinel inclusions had primarily the same and common composition at the time of magma emplacement. This implies that all the inclusion-bearing crystals, olivine and plagioclase, represent primary phenocrysts that had already existed in the emplaced magma. In this way, spinel inclusion in the MGI may be regarded to be a useful petrographic “marker” for identifying intratelluric phenocrysts and also as a “tracer” to trace the motion of the primary phenocrysts after the magma emplacement.
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References
- Akatsuka T, Obata M, Yokose H (1999) Formation of layered structure in the Murotomisaki gabbroic complex, especially picrite gabbro, Kochi Prefecture, Japan—quantitative evaluation of crystal accumulation. J Geol Soc Jpn 105:771–788 (in Japanese with English abstract)
Article Google Scholar - Feig ST, Koepke J, Snow JE (2006) Effect of water on tholeiitic basalt phase equilibria: an experimental study under oxidizing conditions. Contrib Mineral Petrol 152:611–638
Article Google Scholar - Feig ST, Koepke J, Snow JE (2010) Effect of oxygen fugacity and water on phase equilibria of a hydrous tholeiitic basalt. Contrib Mineral Petrol 160:551–568
Article Google Scholar - Fujii T (1974) Crystal settling in a sill. Lithos 7:133–137
Article Google Scholar - Gibb FGF, Henderson CMB (2006) Chemistry of the Shiant Isles Main Sill, NW Scotland, and wider implications for the petrogenesis of mafic sills. J Petrol 47:191–230
Article Google Scholar - Gray NH, Crain IK (1969) Crystal settling in sills: a model for suspension settling. Can J Earth Sci 6:1211–1216
Article Google Scholar - Hamamoto R, Sakai H (1987) Rb–Sr age of granophyre associated with the Muroto-misaki gabbroic complex. Sci Rep Fac Sci Kyushu Univ Geol 15:131–135 (in Japanese with English abstract)
Google Scholar - Helz RT (1980) Crystallization history of Kilauea Iki lava lake as seen in drill core recovered in 1967–1979. Bull Volcanol 43:675–701
Article Google Scholar - Hoshide T, Obata M (2009) Zoning and resorption of plagioclase in a layered gabbro, as a petrographic indicator of magmatic differentiation. Trans R Soc Edinb Earth Sci 100:235–249
Article Google Scholar - Hoshide T, Obata M (2012) Amphibole-bearing multiphase solid inclusions in olivine and plagioclase from a layered gabbro: origin of the trapped melts. J Petrol 53:419–449
Article Google Scholar - Hoshide T, Obata M, Akatsuka T (2006) Crystal settling and crystal growth of olivine in the magmatic differentiation—the Murotomisaki Gabbroic Complex, Shikoku, Japan. J Mineral Petrol Sci 101:223–239
Article Google Scholar - Hunter RH (1987) Textural equilibrium in layered igneous rocks. In: Parsons I (ed) Origins of igneous layering, NATO ASI series C 196:473–503
- Jaupart C, Brandeis G (1986) The stagnant bottom layer of convecting magma chambers. Earth Planet Sci Lett 80:183–199
Article Google Scholar - Kodama K, Koyano T (2003) Paleomagnetism and magnetic fabric of a mafic intrusive body and surrounding sedimentary rocks in the shimanto belt, southwest Japan: structural evolution of an accretionary prism recorded in magnetization of fore-arc intrusive rocks. In: IUGG 2003 Scientific Program Abstract, GAI.06. International Union of Geodesy and Geophysics, Sapporo, Japan
- Kodama K, Taira A, Okamura M, Saito Y (1983) Paleomagnetism of the Shimanto Belt in Shikoku, southwest Japan. In: Hashimoto M, Uyeda S (eds) Accretion tectonics in the circum-Pacific regions. Terra Scientific, Tokyo, pp 231–241
Chapter Google Scholar - Latypov RM (2003a) The origin of marginal compositional reversals in basic–ultrabasic sills and layered intrusions by Soret fractionation. J Petrol 44:1579–1618
Article Google Scholar - Latypov RM (2003b) The origin of basic–ultrabasic sills with S-, D-, and I-shaped compositional profiles by in situ crystallization of a single input of phenocryst-poor parental magma. J Petrol 44:1619–1656
Article Google Scholar - Latypov RM, Chistyakova S (2009) Phase equilibria testing of a multiple pulse mechanism for origin of mafic–ultramafic intrusions: a case example of the Shiant Isles Main Sill, NW Scotland. Geol Mag 146:851–875
Article Google Scholar - Latypov RM, Egorova V (2012) Plagioclase compositions give evidence for in situ crystallization under horizontal flow conditions in mafic sills. Geology 40:883–886
Article Google Scholar - Mangan MT, Marsh BD (1992) Solidification front fractionation in phenocryst-free sheet-like magma bodies. J Geol 100:605–620
Article Google Scholar - Schmidt MW, Forien M, Solferino G, Bagdassarov N (2012) Settling and compaction of olivine in basaltic magmas: an experimental study on the time scales of cumulate formation. Contrib Mineral Petrol 164:959–976
Article Google Scholar - Scowen P, Roeder PL, Helz RT (1991) Reequilibration of chromite within Kilauea Iki lava lake, Hawaii. Contrib Mineral Petrol 107:8–20
Article Google Scholar - Wager LR, Brown GM (1968) Layered igneous rocks. Oliver and Boyd, Edinburgh
Google Scholar - Wilson AH (1982) The geology of the Great ‘Dyke’, Zimbabwe: the ultramafic rocks. J Petrol 23:240–292
Article Google Scholar - Yajima T (1972a) Petrology of the Murotomisaki gabbroic complex. J Jpn Assoc Mineral Petrol Econ Geol 67:218–241
Article Google Scholar - Yajima T (1972b) Petrochemistry of the Murotomisaki gabbroic complex. J Jpn Assoc Mineral Petrol Econ Geol 67:247–261
Article Google Scholar
Acknowledgments
This study is a part of the doctoral thesis of T. H. at Kyoto University being financially supported by the Grant-in-Aid for JSPS Fellows (No.19.4363) to T. H. He is grateful to the Department of Geology and Mineralogy, Kyoto University. The manuscript was mostly written during his postdoctoral periods at Kyushu University and at Tohoku University. T. H. thanks A. Toramaru (Kyushu University) and M. Nakamura (Tohoku University) for their generous supports during these periods. We also thank D. Lenaz and two anonymous reviewers for their constructive criticism and suggestions for improving the manuscript and to M. Schmidt for his editorial handling.
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Authors and Affiliations
- Department of Earth Resource Science, Faculty of International Resource Sciences, Akita University, Akita, 010-8502, Japan
Takashi Hoshide - Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan
Masaaki Obata
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Correspondence toTakashi Hoshide.
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Communicated by M. W. Schmidt.
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Hoshide, T., Obata, M. Spinel inclusions in olivine and plagioclase crystals in a layered gabbro: a marker and a tracer for primary phenocrysts in a differentiating magma reservoir.Contrib Mineral Petrol 168, 1049 (2014). https://doi.org/10.1007/s00410-014-1049-8
- Received: 27 September 2013
- Accepted: 28 July 2014
- Published: 09 August 2014
- DOI: https://doi.org/10.1007/s00410-014-1049-8