Acta Geodynamica et Geomaterialia

Title: GEOCHEMICAL STUDY OF THE TONGSHAN INTRUSION IN THE LOWER YANGTZE RIVER METALLOGENIC BELT, CHINA: SIGNIFICANCES OF CU-AU ORE-FORMING
Authors: Gu Huangling, Liu Zhen, Li Lin and Zhao Xianchao
DOI: 10.13168/AGG.2022.0015
Journal: Acta Geodynamica et Geomaterialia, Vol. 19, No. 4 (208), Prague 2022
Full Text: PDF file (4.0 MB)
Keywords: Tongshan; adakite; Late Mesozoic; partial melting; subducted oceanic crust
Abstract: The Tongshan intrusion is located at the Guichi ore cluster field along the Lower Yangtze River metallogenic belt (LYRB) in eastern China. Elemental data and major elements of biotite are reported for Late Mesozoic plutons in the Guichi ore cluster in the Middle-Lower Yangtze River Region, attempting to explain their diagenetic age, petrogenesis, and tectonic implications. The Tongshan intrusion is dated at 146.3±3.2 Ma, with zircon εHf(t) average value of -5.23, illustrating that the Tongshan intrusion could be derived from crust mantle mixing magmatite provenance. The two-stage Hf model ages between 1184~1422 Ma is indicated magma source relationship with those of the Mesoproterozoic basement in south Anhui. The Tongshan intrusion is high-K calc-alkaline, and exhibit adakite-like geochemical feature, such as high Al2O3, Sr contents, Sr/Y value, low Y and Yb contents. The geochemical and reexplained published isotopic data indicate that these adakites are most likely from partial melting of subducted oceanic crust, and mixed with enriched lithospheric mantle components in the rising process.