Abstract
National Natural Science Foundation of China [41530207, 41772188]; Romanian Executive Agency for Higher Education, Research, Development and Innovation Funding project [PN-III-P4-ID-PCE-2016-0127]; China Geological Survey [1212011085534]; China Scholarship Council [201606010070]
Highlights
Intermediate magmatism at subduction margins is relatively well understood,(Stern, 2002; Grove et al, 2012; Ducea et al, 2015a), numerous uncertainties remain
We suggest that the CMG granites are mainly derived from low δ18O Neoproterozoic metabasaltic to metatonalitic rocks, and that the MFG granites are mainly derived from high δ18O Neoproterozoic metagreywackes
The mafic xenoliths were derived from partial melting of a phlogopite-bearing sub-continental lithospheric mantle
Summary
(Stern, 2002; Grove et al, 2012; Ducea et al, 2015a), numerous uncertainties remain. To help understand the nature of magmatism in collisional orogenic systems, we have undertaken a study of the Huayang intrusive complex, the largest granitoid batholith in the South Qinling Belt (SQB). Extensive early Mesozoic granitoid intrusions are exposed in the SQB (Fig. 1; Dong & Santosh, 2016). The CMG granites are mainly composed of quartz (30–35%), K-feldspar (40–50%), plagioclase (10–18%), biotite (3–10%) and minor muscovite, with accessory minerals of ilmenite, apatite, and zircon (Fig. 4g–i). Muscovites in granodiorites and granites form at the rim of biotites, and/or within anhedral to subhedral feldspars, indicating they may be secondary (Fig. 4f, h–l; Miller et al, 1981; Ding et al, 2012)
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