Genesis and metallogenic characteristic of Dongnan Cu–Mo deposit associated granitoids: LA-ICP-MS zircon U–Pb dating and isotope constraint from Zijinshan ore field in southeastern China

Xie, Qi‐Feng; Zhai, Mingguo; Cai, Yuanfeng; Dong, Yunpeng; Zhang, Zeyu; Ai-fang, Xiao

doi:10.1007/s11631-022-00581-8

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“…No matter the collapse of the continental margin arc or the extension of the back-arc, which may be promote the extension of the lithosphere and form large scale magmatic activities (Li and Li, 2007). The late Mesozoic A-type granitoids and alkaline intrusions of Southeast China characterized similar geochemical features, which generated by plate subduction and backarc extension (Wang et al, 2005a, b;Xie et al, 2022Xie et al, , 2023. We determine that the miarolite of the Kuiqi and Qishan intrusions formed in multi-stage magmatic activities of the Early and Late Cretaceous (~101 Ma), and in a single magmatic activity of the Late Cretaceous (~98 Ma), respectively.…”

Section: Dynamics Implication Of Southeast Chinamentioning

confidence: 99%

The Origin of Mesozoic A‐type Granitoids, Fujian Province, Southeast China: Insights from Geochronology, Mineralogy and Geochemistry

XIE,

DONG,

CAI

et al. 2024

Acta Geologica Sinica (Eng)

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The magma sources, origins and precise forming ages of the miarolite from Qishan and Kuiqi intrusions are still uncertain. New results reveal that, miarolites from the Qishan and Kuiqi intrusions yield crystallization ages of —101 and ∼98 Ma, and they have a high formation temperature (∼910°C) and low oxygen fugacity value, indicating crystallization condition at low pressure in the upper crust with temperature of 678°C. The Qishan and Kuiqi miarolites are characterized by enrichment in SiO2 and high‐K alkali, depletion in Ca and Mg, and belong to the high‐K weak peraluminous rock series. The samples are enriched in HFSEs (i.e., Ta, Zr and Hf) and LILEs (i.e., Ba, P and Sr), depleted in Ba and Sr with the negative anomaly of Eu. In the primitive mantle normalized trace element spider diagram, the samples show a right‐inclined ‘seagull‐type’ pattern, combined the ratios of (La/Yb)N, 10000 × Al/Ga, Rb/Nb and Nb/Ta etc., they were proved to be alkaline A‐type granite. Combined the characterize of the trace elements, they were derived from clay‐rich source accompanied pelite melting, and subjected to K‐feldspar crystallization fractional. The values of ɛHf(t) and tDM2 are distributed in the range of −2.8 to 3.3 with ∼1.2 Ga, and −6.0 to 4.0 with ∼1.2 Ga, revealing that they were generated from the Mesoproterozoic Cathaysia basement rocks. The comprehensive research reveals the Kuiqi and Qishan intrusions derived from crust‐mantle mixing and partial melting of the crust, respectively, resulting from lithospheric extension generated by the Paleo‐Pacific Plate subducted into the European‐Asian Plate.

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Section: Dynamics Implication Of Southeast Chinamentioning

confidence: 99%