A felsic MASH zone of crustal magmas — Feedback between granite magma intrusion and in situ crustal anatexis

Wet or dry? The difficulty of identifying the presence of water during crustal melting

“…The southern part of this orogen is dominated by the Cambrian Kanmantoo Group, a thick succession of immature turbidites ranging from psammites to pelites (Figures and , Flöttmann et al., ). This sequence is both the source and the host of several granite intrusion in the area with large outcrops of migmatite in their vicinity, best exposed on the south coast of Kangaroo Island (Figure , Foden et al., ; Schwindinger & Weinberg, ; Weinberg, Hasalová, Ward, & Fanning, ). The intrusive rocks range from transitional S/I‐type granites (Foden et al., ) to pure crustal S‐type granites exposed in several leucogranite bodies, which intrude and mingle with diatexite and metatexite migmatites (Foden et al., ; Schwindinger & Weinberg, ).…”

“…This sequence is both the source and the host of several granite intrusion in the area with large outcrops of migmatite in their vicinity, best exposed on the south coast of Kangaroo Island (Figure , Foden et al., ; Schwindinger & Weinberg, ; Weinberg, Hasalová, Ward, & Fanning, ). The intrusive rocks range from transitional S/I‐type granites (Foden et al., ) to pure crustal S‐type granites exposed in several leucogranite bodies, which intrude and mingle with diatexite and metatexite migmatites (Foden et al., ; Schwindinger & Weinberg, ). Granite intrusion on Kangaroo Island took place at 503 ± 4 Ma (Fanning, ) and partly overlaps with the syn‐tectonic anatexis of the diatexite migmatites dated between 495 and 465 Ma (Weinberg et al., ).…”

“…Extent of the Kanmantoo Group in the Adelaide fold belt and on Kangaroo Island, highlighting the position of the migmatites in the field area at the south coast of Kangaroo Island (black rectangle) and the position of Delamerian granite intrusions (modified after Schwindinger & Weinberg, ) [Colour figure can be viewed at wileyonlinelibrary.com]…”

Early Carboniferous High Ba‐Sr Granitoid in Southern Langshan of Northeastern Alxa: Implications for Accretionary Tectonics along the Southern Central Asian Orogenic Belt

“…13). In the MASH zone, basaltic mantle magmas cause partial melting of ancient lower crust (possibly represented by the Diebusige complex), with which they hybridize and homogenize before rising and fractionating (Schwindinger and Weinberg, 2017). Magmas generated in the MASH zone ascended and were emplaced in the middle-upper crust at different depths (stage 4 in Fig.…”

“…13), which may have resulted in different geochemical characteristics, such as different Sr/Y and La/Yb ratios. Granite magma ascent in the crust evolves through multiple stages, with periods of intra-crustal magma interaction in felsic MASH zones (Schwindinger and Weinberg, 2017). Fractional crystallization occurred during the ascent, and hornblende, K-feldspar, apatite, allanite, and monazite fractionated from the original magma.…”