Cr-spinel Seam Petrogenesis in the Rum Layered Suite, NW Scotland: Cumulate Assimilation and in situ Crystallization in a Deforming Crystal Mush

Experimental petrology constraints on the recycling of mafic cumulate: a focus on Cr-spinel from the Rum Eastern Layered Intrusion, Scotland

“…Thus the Rum Eastern Layered Intrusion is an excellent example of reactive liquid flow processes ( Figure 1) in an open magmatic system. Some of the best evidence of partial melting of resident troctolite and gabbro rocks by intrusive picrite liquids and subsequent melt hybridization include: Cr-spinel-bearing anorthosite produced after picrite percolation through troctolite (O'Driscoll et al, 2009b(O'Driscoll et al, , 2010; formation of poikilitic gabbro with clinopyroxene oikocrysts (ca. 1 cm across) formed in gabbro percolated by hybrid melt (Leuthold et al, 2014a); and bulk rock reversals in isotopic composition (Palacz and Tait, 1985).…”

“…At the Unit 7-8 and 11-12 boundaries, millimetre-thick chromitite seams occur at the interface between overlying olivine-rich feldspathic peridotite and underlying feldspar-rich allivalite (anorthosite, troctolite) (Dunham and Wadsworth, 1978 and references therein;O'Driscoll et al, 2009bO'Driscoll et al, , 2010. Spinel is frequently associated with plagioclase, either in anorthosite or mantled by plagioclase in olivine rim embayments (similar to Bell and Claydon [1992] for the Skye layered intrusion) (e.g.…”

“…Irvine, 1965;Roeder et al, 1979;Engi, 1983). Diffusion (discussed below) in the Fe-Mg sites continues at sub-solidus conditions (O'Driscoll et al, 2010). Wilson (1982) concluded that geothermometers based on chromite-silicate equilibria are probably not applicable to slowly-cooled layered intrusions, but information on thermal histories may be gleaned from diffusion profiles.…”

Textural records and geochemistry of the Kermanshah mantle peridotites (Iran): implications for the tectonic evolution of southern Neo-Tethys

“…However, others have suggested that this texture is formed by melt-rock reaction in the mantle (Bézard et al 2011). O'Driscoll et al (2010) suggested that such features could prove co-precipitation of Cr-spinel with olivine.…”

マントル岩起源砕屑物の解析

“…3a , 1978aBarnes, 2000;Arai et al, 2006b;Mellini et al, 2005;Merlini et al, 2009;Khedr andArai, 2010 Mg# Cr# Arai et al, 2006b;Khedr and Arai, 2010 Fig. 2a Fe Power et al 2000 Henderson, 1975;Henderson and Wood, 1981;O Driscoll et al, 2009O Driscoll et al, , 2010 , , , 1978b;Utter, 1978;, 1983;Arai andOkada, 1991 / , , 1959;, 1963;Iijima, 1964a, b;Dietrich and Franz, 1976;Hiscott, 1978;Nelson and Casey, 1979Iijima, 1964a, b Iijima 1964a, b , , Iijima 1964a, b Cr , Hiscott, 1984Iijima 1964a, b 1986Hisada and Arai, 1993, 1994Hisada et al, 1997aHisada et al, , b, 1999Hisada et al, , 2004Hisada et al, , 2008, 2000;Chutakositkanon et al, 2001;Hisada, 2008 Nanayama et al, 1993;, 1994;, 19971994Takeuchi et al 2008…”