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首页> 外文期刊>Stratigraphy >Stratigraphy of Triassic-Jurassic boundary sequences from the Kawhia coast and Awakino gorge, Murihiku Terrane, New Zealand
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Stratigraphy of Triassic-Jurassic boundary sequences from the Kawhia coast and Awakino gorge, Murihiku Terrane, New Zealand

机译：新西兰Murihiku Terrane的Kawhia海岸和Awakino峡谷的三叠纪-侏罗纪边界层序地层学

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摘要

We have examined the stable carbon isotope stratigraphy, bio- and litho-stratigraphy of the Upper Triassic (Otapirian) - Lower Jurassic (Aratauran) boundary strata from the Awakino gorge and Kawhia coast sections, Murihiku Terrane, North Island, New Zealand. Successive occurrences of species of the bivalve genus Otapiria, O. dissimilis, O. marshalli and O. aff. marshalli, and also of age diagnostic ammonites indicate that the Hettangian strata in both sections are very thin compared with the Rhaetian sequences. Lamination structures are well developed at the Tr-Jr (Rhaetian-Hettangian) boundary transition interval. The δ~(13)C values of organic matter from siltstone and carbonate nodules in the sedimentary rocks range from -28.5 to -25.5%o and there is no correlation between δ~(13)C_(org) and C/N ratios. The excursion patterns of δ~(13)C_(org) from both sections are similar, showing a negative spike at the uppermost Rhaetian and a positive spike immediately below the Tr-Jr boundary. A long-lived positive shift is also recognized in the Awakino gorge section, which coincides in pattern with those reported in Tr-Jr boundary successions from the Queen Charlotte Islands, British Columbia, Canada. These results suggest that although magnitude and absolute values are slightly different, the integrated pattern of stable carbon isotope signatures over the Tr-Jr boundary could be a valuable tool for correlation, at least between sedimentary rocks from similar depositional settings in the Panthalassa.
机译：我们研究了来自新西兰北岛Murihiku Terrane的Awakino峡谷和Kawhia海岸断层的上三叠纪（奥塔皮阶）-下侏罗统（阿拉托兰）边界地层的稳定碳同位素地层，生物和岩石地层。双壳类Otapiria，O。dissimilis，O。marshalli和O. aff的连续发生。 Marshalli以及年龄诊断性的铵铁矿表明，与Rhaetian层序相比，这两段中的Hettangian地层都非常薄。层状结构在Tr-Jr（Rhaetian-Hettangian）边界过渡区间内发育良好。沉积岩粉砂岩和碳酸盐结节中有机质的δ〜（13）C值在-28.5〜-25.5％o之间，δ〜（13）C_（org）与碳氮比无相关性。两个部分的δ〜（13）C_（org）偏移模式相似，在最上层的Rhaetian处显示负尖峰，而在Tr-Jr边界正下方显示正尖峰。在Awakino峡谷部分也发现了长期的积极转变，这与加拿大不列颠哥伦比亚省夏洛特皇后群岛的Tr-Jr边界演替中报道的规律一致。这些结果表明，尽管幅度和绝对值略有不同，但至少在Panthalassa相似沉积环境中的沉积岩之间，Tr-Jr边界上稳定碳同位素特征的整合模式可能是有价值的相关工具。

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