Age and generation of Fogang granite batholith and Wushi diorite-hornblende gabbro body

摘要: Fogang granitic batholith, the largest Late Mesozoic batholith in Nanling region, has an exposure area of ca. 6000 km2. Wushi diorite-homblende gabbro body is situated at northeast part batholith. Both main and belong to high-K calc alkaline series. Compared with body, lower Si (49%–55%), higher Fe, Mg, Ca, REE, less depletion Eu, Ba, P, Ti, obvious Zr, Hf. Zircon LA-ICP-MS dating mineral-whole rock isochron reveal that were generated simultaneously 160 Ma. The high (87Sr/86Sr)i ratios (0.70871–0.71570) low ɛNd(t) values (−5.11–−8.93), suggesting origins rocks from crustal materials. Their Nd two-stage model ages range 1.37–1.68 Ga. Sr isotopic compositions may suggest giant was a heterogeneous source, participation mantle component. unusual intermediate-basic magmatic series, (0.71256–0.71318) (−7.32–−7.92), which possibly formed through mixing between mantle-derived juvenile basaltic magma produced by dehydration melting rocks.