Westfjords, Iceland whole rock elemental and isotopic compositions and zircon ages, compositions, and O and Hf isotopes

Iceland’s oldest silicic rocks provide unique insight into the island’s early crustal evolution. We present new zircon U-Pb ages bolstered with zircon trace element and isotopic compositions, and whole rock Nd, Hf, and Pb isotope compositions, from three silicic magmatic centers—Hrafnsfjörður, Árnes, and Kaldalón—to understand the petrogenesis of large silicic volcanic centers in the northern Westfjords, Iceland.冰岛最古老的硅质岩石（silicic rocks）为该岛的早期地壳演化提供了独特研究视角。本研究针对赫拉恩斯峡湾（Hrafnsfjörður）、阿尔内斯（Árnes）与卡尔达隆（Kaldalón）三处硅质岩浆中心（silicic magmatic centers）的样品，报道了全新的锆石U-Pb年龄（zircon U-Pb ages）数据，并辅以锆石微量元素（trace element）与同位素组成（isotopic compositions）、全岩（whole rock）钕（Nd）、铪（Hf）及铅（Pb）同位素组成数据，以期阐明冰岛西峡湾（Westfjords）北部大型硅质火山中心的岩石成因。