Seasonality in low latitudes during the Oxfordian (Late Jurassic) reconstructed via high-resolution stable isotope analysis of the oyster Actinostreon marshi (J. Sowerby, 1814) from the Kachchh Basin, western India

Seasonality in low latitudes during the Oxfordian (Late Jurassic) reconstructed via high-resolution stable isotope analysis of the oyster Actinostreon marshi (J. Sowerby, 1814) from the Kachchh Basin, western India
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通过对来自印度西部卡奇盆地的牡蛎 Actinostreon marshi (J Sowerby, 1814) 进行高分辨率稳定同位素分析重建牛津纪(晚侏罗世)低纬度地区的季节性

DOI:
10.1007/s00531-013-0864-x
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发表时间:
--
影响因子:
2.3
通讯作者:
Pandey
Pandey
中科院分区:
地球科学3区
文献类型:
--
作者:
Alberti;Fürsich;Pandey

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对印度西部卡奇盆地下牛津阶的牡蛎 Actinostreon marshi(J. Sowerby,1814)样本进行高分辨率稳定同位素(δ18O、δ13C)分析,用于重建连续 10 年时间间隔的平均季节性温度。在此期间记录的气温平均变化约为 13 °C(最高:15.1 °C;最低:11.4 °C),季节性较低,一般在 1 至 3 °C 之间。如此微弱的季节变化是在南纬 25° 至 30° 之间的副热带古纬度范围内预料到的。然而,较低的平均气温与对欧洲和马达加斯加湾南部的大致同期化石的研究形成鲜明对比,这些研究表明这些地区的条件要温暖得多。因此,有人认为卡奇盆地的低温是由晚侏罗世影响印度西北海岸的上升流引起的。
A high-resolution stable isotope (δ18O, δ13C) analysis of a specimen of the oysterActinostreon marshi(J. Sowerby, 1814) from the Lower Oxfordian of the Kachchh Basin in western India was used to reconstruct average seasonal temperatures over a consecutive time interval of 10 years. The recorded temperatures during this period varied around a mean of 13 °C (maximum: 15.1 °C; minimum: 11.4 °C) with a generally low seasonality between 1 and 3 °C. Such weak seasonal changes can be expected from a subtropical palaeolatitude between 25° and 30°S. However, the low average temperatures are in contrast to studies on broadly contemporaneous fossils from Europe and the southern Malagasy Gulf which point to much warmer conditions in these areas. It is therefore proposed that the low temperatures in the Kachchh Basin are caused by upwelling currents which influenced the north-western coast of India during the Late Jurassic.
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