下扬子地区晚中生代C型埃达克岩研究进展与展望——以长江中下游地区晚中生代为例
Research Progress and Outlook on Late Mesozoic C-Type Adakites in the Lower Yangtze Region—A Case Study of the Late Mesozoic in the Middle-Lower Yangtze River Area
摘要: 中国东部下扬子地区晚侏罗世–早白垩世广泛发育大陆型C型埃达克岩，岩石组合以花岗闪长岩、英云闪长岩、安山岩、英安岩为主，属钙碱性系列。其地球化学表现为高硅、高铝、富钾、低镁、高Sr/Y与La/Yb比值、低Y及重稀土、弱负铕异常，Na2O/K2O比值接近1，同位素以富集型为特征，与环太平洋O型埃达克岩差异显著。该类岩石为加厚大陆下地壳玄武质岩石高压部分熔融形成，残留相以石榴石 + 角闪石为主，形成于古太平洋板块俯冲远程效应、华北克拉通破坏与地壳加厚–岩石圈减薄的构造背景，与Cu-Au等矿床密切耦合，具重要构造指示与找矿意义。当前研究在判别标准、动力学过程与成矿机理上仍存争议，未来需多方法定量约束深化认识。
Abstract: Late Jurassic-Early Cretaceous in eastern China is widely distributed with continental-type C-type adakites, dominated by granodiorite, tonalite, andesite and dacite, belonging to the calc-alkaline series. Geochemically, they are characterized by high silica, high alumina, potassium enrichment, low magnesium, high Sr/Y and La/Yb ratios, low Y and heavy rare earth elements, weak negative Eu anomalies, and Na2O/K2O ratio close to 1, with enriched isotopic compositions, distinctly different from circum-Pacific O-type adakites. These rocks were generated by high-pressure partial melting of mafic rocks in the thickened continental lower crust, with garnet and amphibole as residual phases. They formed in a tectonic setting involving the remote effect of Paleo-Pacific plate subduction, North China Craton destruction, and crustal thickening–lithospheric thinning, and are closely associated with Cu-Au mineralization, providing significant implications for tectonic evolution and mineral exploration. Controversies remain in discrimination criteria, dynamic processes and metallogenic mechanisms, and future studies require multi-method quantitative constraints.
文章引用：陈藤吉, 贾悦, 李明杰, 范艳芹. 下扬子地区晚中生代C型埃达克岩研究进展与展望——以长江中下游地区晚中生代为例[J]. 地球科学前沿, 2026, 16(5): 782-791. https://doi.org/10.12677/ag.2026.165071

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