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首页> 外文期刊>Journal of Asian earth sciences >Fusulinid-bearing oolites from the Tengchong Block in western Yunnan, SW China: Early Permian warming signal in the eastern peri-Gondwana
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Fusulinid-bearing oolites from the Tengchong Block in western Yunnan, SW China: Early Permian warming signal in the eastern peri-Gondwana

机译：中国西南部云南腾冲区块的含梭链脲体的橄榄岩：冈多纳东部东部的二叠纪早期变暖信号

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摘要

Discovery of fusulinid-bearing oolites from the Tengchong Block in western Yunnan, China, provides new insights into Permian paleoclimatic history of the eastern peri-Gondwana. In the northern Tengchong Block, new carbonate samples from the lower part of the Dadongchang Formation yield a monotonous fusulinid assemblage, comprising Eoparafusulina tschernyschewi tschernyschewi, E. tschernyschewi oblonga, E. tibetica, E. aff. tschernyschewi tschernyschewi and E. aff. laudoni. This assemblage correlates well to late Sakmarian-Artinskian fusulinids widespread among the Cimmerian blocks in peri-Gondwana, which were characterized by low diversity and dominance of cosmopolitan taxa. Such fusulinids have been interpreted to indicate temperate-water environment in the aftermath of late Paleozoic glaciation. Moreover, the eastern Cimmerian region has been suggested, by both paleontological and sedimentological data, to be even cooler than the western region especially during the Early Permian. However, the fusulinids of this study unexpectedly occur within oolites, as ooids diagnostic for warm-water settings, have never been recorded from Early Permian strata of any eastern Cimmerian block. This new finding in the northern Tengchong Block indicate that the shallow marine there was warm enough to accommodate not only poorly diversified fusulinids but also oolites, even immediately posterior to the late Paleozoic glaciation. The appearance of these oolites is more likely ascribed to a warming pulse of sea-surface temperature in the context of post-glacial climatic amelioration than to the northward drift of the Tengchong Block.
机译：在中国云南西部的腾冲地块发现含岩藻脂的橄榄岩，为冈多纳东部东部的二叠纪古气候史提供了新的见解。在腾冲地块的北部，来自大东昌组下部的新碳酸盐样品产生了单调的镰孢菌素组合，其中包括伊波拉夫林单胞菌tschernyschewi tschernyschewi，E.tschernyschewi oblonga，E.tibetica，E.aff.。 tschernyschewi tschernyschewi和E. aff。劳多尼。这种组合与冈底瓦纳周边西米勒块中广泛分布的后期萨克马尔-阿丁斯基融合藻类有很好的关联，其特征是低多样性和世界性分类单元的优势。此类岩藻素已被解释为在晚古生代冰川形成之后指示温带水环境。此外，无论是古生物学还是沉积学数据，都建议东部的Cimmerian地区要比西部地区凉爽，特别是在二叠纪初期。但是，这项研究中的融合藻类化合物意外地发生在橄榄岩中，因为诊断温水环境的类固醇没有从任何东部的Cimmerian区块的二叠纪早期地层中记录下来。腾冲地块北部的这一新发现表明，那里的浅海温度足够温暖，不仅可以容纳多样性不佳的融合藻类，而且还可以容纳橄榄岩，甚至是在晚古生代冰川作用之后。这些冰川岩的出现更可能归因于冰川后气候改善背景下海面温度的升高，而不是腾冲地块北移。

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