Whole-rock trace-element analyses contain previously unutilized evidence of mantle source fertility, degree of partial melting, and silicate melt hydration state that are applicable to arc magmatism globally. Spidergram arrays of gold-fertile mafic melts have steeper slopes than gold-infertile ones, characterized by higher Ba/Zr, Nb/Y, and U/Yb. Spidergrams of gold-fertile mafic magmas indicate relatively low percentage melting of lithospheric mantle metasomatized by migrating silicate melts as well as aqueous fluids. Gold-fertile and -infertile melts retain distinctively high Ba/Zr, Nb/Y, and U/Yb across the mafic-to-felsic differentiation series. Plots of V/Y versus Ba/Zr discriminate relative hydration states during magmatic differentiation. The ability of these ratios to discriminate gold-mineralizing magmas is demonstrated by comparison of barren reference suites with our compilation of the compositions of Phanerozoic magmas that generated 138 magmatic-hydrothermal gold deposits worldwide. The distinction between mafic melt compositions in mineralized and barren igneous complexes demonstrates that gold metallogenic fertility and infertility are primary properties of melts generated in different mantle source regions. Magmatic gold fertility typically pervades gold ore provinces for the duration of the regional metallogenic epoch, until changing geodynamics modifies the balance of mantle melt sources.

Carolina Mafra

Robert Loucks

Marco Fiorentini

Geology

自 1973 年出版以来，《地质学》的特点是每月快速出版约 23 篇经过评审的短篇（四页）论文。文章涵盖所有地球科学学科，包括新的调查和挑衅性话题。地球科学专业的地质学家和大学水平的学生使用这本广泛阅读的期刊来跟上科学研究的趋势。在线论坛部分促进了作者与读者的对话。在超大尺寸松散插页上包括彩色插图和偶尔的大幅面插图。

Since its inception in 1973, Geology has featured approximately 23 peer-reviewed short papers (four pages each) published rapidly each month. The articles cover all disciplines of Earth sciences, including new investigations and provocative topics. Geologists and university-level students in the Earth sciences widely read this journal to keep up with trends in scientific research. The online forum section facilitates dialogue between authors and readers. Color illustrations and occasional large-format illustrations are included on oversized loose inserts.

《Geology》自1973年创刊以来，每月快速出版约23篇经过同行评审的短篇论文（四页）。这些文章涵盖了所有地球科学领域，包括新的研究调查和具有挑战性的话题。地球科学专业的地质学家和大学生广泛阅读这本期刊，以跟踪科学研究的最新趋势。期刊的在线论坛部分促进了作者与读者之间的交流。此外，期刊还在超大尺寸的松散插页上包含彩色插图和偶尔的大幅面插图。

Category	Quartile
地球科学	1
地球科学, 地质学	1

Distinctive source and hydration state of gold-ore−forming arc magmas

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