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首页> 外文期刊>International Journal of Earth Sciences >Sedimentology and detrital zircon geochronology of the Nanduan Formation (Carboniferous) of the Changning-Menglian Belt: indications for the evolution of Paleo-Tethys in western Yunnan, China
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Sedimentology and detrital zircon geochronology of the Nanduan Formation (Carboniferous) of the Changning-Menglian Belt: indications for the evolution of Paleo-Tethys in western Yunnan, China

机译：长宁 - 蒙连皮带的南南地层沉积物和滴乳锆石体地位论：中国云南西部古特神的演变的适应症

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摘要

The Changning-Menglian Belt in western Yunnan, China, has been considered for decades as a remnant of Paleo-Tethys in this region. However, the understanding of the geological evolution of the belt remains sketchy and incomplete. As a significant component of the stratigraphic successions in the eastern part of the belt, the siliciclastic Nanduan Formation preserved essential information of the developing history of the belt. Petrologic studies of the formation show that it was deposited in a neritic environment. The increase of mudstone beds and decrease of grain size of sandstones upwards suggest a gradual deepening of sedimentary environment. Petrographic and geochemical characteristics of sandstones show that they were derived from mature continental provenance and deposited in a passive continental margin setting. Detrital zircon ages of the formation range from 362 to 3685 Ma. The youngest detrital zircon age (362.2 +/- 5.5 Ma) confines the deposition age of the sandstones to being younger than the latest Devonian. Dominant age populations of ca. 950 Ma and ca. 550 Ma can be correlated with the magmatic events that occurred in Eastern Ghats-northern Prince Charles (India-Antarctica) (ca. 950 Ma) and Pan-African orogens (Australia-India) (ca. 550 Ma), which are considered, therefore, to be the main provenance of the Nanduan Formation. These results let us consider that the Nanduan Formation and the underlying Lancang Group were formed on the margin of the Baoshan-Shan Block (therefore, autochthonous), and the Carboniferous. Permian limestones of seamount resemblance, the oceanic bedded cherts, and basic and ultra-basic igneous rocks in the central zone of the belt are overthrusted slices (allochthonous).
机译：中国西部的长宁梦领腰带已被认为是该地区的古代古代的遗留物。然而，对皮带的地质演变的理解保持粗略和不完整。作为皮带东部地层继承的重要组成部分，硅质棉花棉花棉花棉花棉花棉花制成的基本信息的基本信息。形成的疾病研究表明它沉积在内腔环境中。泥岩床的增加和砂岩的晶粒尺寸下降建议沉积环境的逐步深化。砂岩的岩石和地球化学特征表明，它们源自成熟的大陆来源并沉积在被动大陆边缘环境中。地层的碎屑锆石年龄从362到3685 mA。最复杂的堕胎年龄（362.2 +/- 5.5 ma）限制了砂岩的沉积年龄，比最新的德文人更年轻。占领年龄的大群体。 950 ma和ca. 550 mA可以与东霍尔斯王子王子（印度南极洲）（CA.950 MA）和泛非洲OROGENS（澳大利亚 - 印度）（约550mA）中发生的岩石事件相关联。因此，成为Nanduan形成的主要出处。这些结果让我们考虑到南南部的形成和局部澜沧群，形成了宝山 - 山块的边缘（因此，自加起来）和石炭系。皮带中央区的二叠纪石灰岩相似，海洋卧院和皮带中心区的基本和超基本的火成岩覆盖（表发）。

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