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SHRIMP U-Pb geochronology of the detrital zircons from the Longshoushan Group and its tectonic significance

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  • Geochemistry
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Chinese Science Bulletin

Abstract

Sixty-two geologically meaningful U-Pb dates were obtained by using SHRIMP technique for the detrital zircons in three metasedimentary rocks from stratigraphically uppermost parts of the Longshoushan Group in the present study. Eighty percents of these dates range from 1.7 Ga to 2.2 Ga with a peak at 1.8–2.0 Ga and twenty percents from 2.3 Ga to 2.7 Ga. The youngest detrital zircon is dated at 1724±19 Ma which is interpreted as the maximum depositional age of the metasedimentary rocks. Therefore, the age for the diagenesis and lithification of the original sedimentary rocks of the Longshoushan Group before the metamorphism must be younger than 1724±19 Ma. Comparison of the age histograms of these detrital zircons with the ages of the igneous rocks on the surrounding older massifs suggests that the sediments of the Longshoushan Group were most likely derived from the Alaxa Block and Tarim Craton. This implies that the affinity between Alaxa Block and Tarim Craton was strong and that they might have been a unified craton during middle-early Proterozoic time.

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Authors and Affiliations

  1. Department of Earth Sciences, Cheng Kung University, Tainan, 701, China

    KuoAn Tung, HoungYi Yang & ChienYuan Tseng

  2. Museum of Natural Science, Taichung, 404, China

    KuoAn Tung

  3. Beijing SHRIMP Centre, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China

    Liu DunYi & Wan YuSheng

  4. Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China

    Zhang JianXin

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  1. KuoAn Tung
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  2. HoungYi Yang
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  3. Liu DunYi
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Correspondence to KuoAn Tung.

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Supported by the Chinese Development and National Science Council (Grant Nos. 91-2116-M-006-16 and 92-2116-M-006-010)

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Tung, K., Yang, H., Liu, D. et al. SHRIMP U-Pb geochronology of the detrital zircons from the Longshoushan Group and its tectonic significance. CHINESE SCI BULL 52, 1414–1425 (2007). https://doi.org/10.1007/s11434-007-0189-x

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  • DOI: https://doi.org/10.1007/s11434-007-0189-x

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