Chronological constraints on multi-cellular organism fossil from Liangshan Formation of Paleoproterozoic Yimen Group in central Yunnan Province
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摘要:
滇中易门地区古元古界易门群亮山组中赋存有保存较好的多细胞生物化石，是大氧化事件，或广义的Lomagundi事件中生物与环境协同演化的产物。由于亮山组中普遍缺乏火山岩夹层及多期构造热事件的扰动，给精确测定这些多细胞生物的时代带来一定困难。以易门县铜厂地区罗洼垤组顶部灰白色凝灰岩1件、亮山组灰白色凝灰岩1件、粉砂质凝灰岩1件、灰黄色钙质粉砂质凝灰岩2件共5件样品260个锆石同位素测试结果为研究对象，结合区域构造热事件的分析，较准确地厘定了易门地区古元古界易门群亮山组中多细胞生物发育的时代为2.18~2.05Ga，与非洲加蓬Franceville地区发现的群居多细胞生物的时代一致，表明地球早期重大地质事件的同时性。
Abstract:Multi-cellular organism fossils from Liangshan Formation of Paleoproterozoic Yimen Group in central Yunnan Province are special products of the co-evolution between early life on the earth and the environment in Great Oxygenation Event (GEO), or generalized Lomagundi Event. However, it is difficult to directerly determine the geological time when the multi-cellular organism lived, because of thegeneral lack of volcanic interlayer in Liangshan Formation and the perturbation of multi-period tectonic thermal events. In this paper, the authors accurately revealed that the multi-cellular organism lived 2.18~2.05Ga years ago, as shown by the 260 zircon grains isotopic testing results, from two incanus tuff samples at the top of Luowadie Formation and in Liangshan Formation respectively, an incanus silty tuff sample in Liangshan formation, two sallow calcareous silty tuff samples in Liangshan Formation, in Tongchang Township, Yimen County, in central Yunnan Province, in combination with regional tectonic thermal events analysis. This epoch is equal to that of multi-cellular organism, found in Franceville area, Gabonese Republic, Africa, suggesting that early important events on the earth had geological synchroneity.
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