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High potassium calc-alkaline rocks from Cape Nelson, eastern Papua

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Abstract

High-K calc-alkaline rocks from Cape Nelson, eastern Papua are dominated by andesites containing numerous basic inclusions. High-Al basalts and dacites are subordinate. The slight iron enrichment and a systematic variation in K2O/SiO2 correlation observed in these rocks suggests a relationship to nearby rocks of a shoshonite association. The chemical composition of the inclusions illustrates the trends of major and minor element evolution which contradict the idea of complimentariness of high-K calc-alkaline rocks and alpine ultramafic rocks. The chemical character of the lavas (high K, Rb and Ba as well as high Cr and Ni) can be explained by fractional melting involving a mica phase.

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Authors and Affiliations

  1. Department of Geology, Australian National University, Canberra

    P. Jakeš

  2. Bureau of Mineral Resources, Canberra

    I. E. Smith

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  1. P. Jakeš
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  2. I. E. Smith
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Jakeš, P., Smith, I.E. High potassium calc-alkaline rocks from Cape Nelson, eastern Papua. Contr. Mineral. and Petrol. 28, 259–271 (1970). https://doi.org/10.1007/BF00388948

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  • DOI: https://doi.org/10.1007/BF00388948

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