| 摘要: |
| 古气候再造可以提高生物地理分区的准确性,有助于研究古植物及动物群生存的生态条件。古气候的研究着重查明过去气候的标志,如矿物、岩石、地球化学、古植物、古动物、岩石构造、地球物理及地貌标志,根据这些标志再造古气候和阐明地球的气候史。经过地质前辈的工作,杨子地台区早石炭世地层古生物和岩相古地理研究已具相当高的水平,积累了丰富的资料,但是对其古气候和古纬度还缺乏系统的研究和总结,尤其是在定量上。本文将依据腕足类壳壁氧同位素值及其它古气候标志,对早石炭世古气候及古纬度进行讨论。 |
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| PALAEOCLIMATES ON THE UPPER YANGTZE PLATFORM DURING THE EARLY CARBONIFEROUS |
| Jiang Jianjun |
| (China University of Geosciences, Beijing) |
| Abstract: |
| The formular T℃=17.04-4.34 (δC-δW)+0.16 (δC-δW)~2 (Horibe, 1972) is used in this paper for the calculation of the palaeotemperatures. With the aid of the oxygen isotope data for 16 genera of the brachiopod shells from the Upper Yangtze platform in combination with other climatic indicators such as carbonate rocks, coal, oolitic limestone, bauxite, oolitic hematite, gypsum (Visean), coral reefs (Visean), K-bearing shale (Visean) and plant remains, the palaeotemperatures of sea water in the study area are estimated about 23℃ in the Tournaisian and near 25-27℃ in the Visean, and the surface temperatures of the Yangtze plate are also estimated around 25℃ in the Tournaisian and around 30℃ in the Visean. |
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