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The Early Paleozoic porphyry-epithermal Au system of the Songshunangou District sits in the central segment of the North Qilian orogenic belt (NQOB). The porphyry Au mineralization is centered on the quartz diorite porphyry (QDP), which is constrained to the Late Ordovician period. However, the geochemical signatures, the origin, and the tectonic setting of the QDP are not yet known and understood and are thus in the focus here. The QDP is a high-K calc-alkaline metaluminous rocks (K2O + Na2O: 6.90‒8.13; Al2O3/(CaO + Na2O + K2O): 0.69‒0.90) characterized by high (87Sr/86Sr)
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