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首页> 外文期刊>Facies >Stable isotope analyses of belemnites from the Kachchh Basin, western India: paleoclimatic implications for the Middle to Late Jurassic transition
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Stable isotope analyses of belemnites from the Kachchh Basin, western India: paleoclimatic implications for the Middle to Late Jurassic transition

机译：来自印度西部卡奇盆地的甜菜碱的稳定同位素分析：中侏罗纪过渡期的古气候意义

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摘要

Stable isotope analyses of 61 diagenetically unaltered belemnite rostra from the Middle to Late Jurassic of the Kachchh Basin of western India suggest stable paleotemperatures across the Callovian-Oxfordian boundary (～14℃). Only at the end of the Middle Oxfordian water temperatures drop for more than 3-C before reaching again higher values during the Kimmeridgian (～12.3℃). The data do not support polar glaciations proposed for the Middle to Late Jurassic transition, which necessarily would have led to a global temperature and sea-level minimum at the boundary. Callovian to Oxfordian rocks in the Kachchh Basin point to a gradual shallowing corresponding to a slight fall in relative sea level. However, the magnitude of this regression is comparatively small, and the sea-level minimum is reached in the late Early Oxfordian and not close to the boundary. Results from the Kachchh Basin therefore, imply almost stable climatic conditions during the Middle to Late Jurassic transition and do not show any evidence for polar glaciations.
机译：对印度西部卡赫奇盆地中侏罗纪至晚侏罗世61个不介电改变的贝伦石岩层进行了稳定的同位素分析，结果表明整个卡洛夫-牛津边界的古温度稳定（约14℃）。仅在牛津中部末期，水温下降超过3-C，然后在Kimmeridgian（〜12.3℃）期间再次达到更高的值。数据不支持为中侏罗纪至晚侏罗世过渡提出的极地冰川，这必然会导致边界处的全球温度和海平面最小值。卡奇（Kachchh）盆地的卡洛夫岩至牛津岩指向逐渐变浅，这意味着相对海平面略有下降。但是，这种回归的幅度相对较小，并且在牛津早期晚期达到了最低海平面，并且不接近边界。因此，Kachchh盆地的结果暗示中侏罗纪过渡期到晚侏罗世过渡期的气候条件几乎稳定，并且没有显示出任何极地冰川的证据。

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