Paleogeographic Reconstruction of the Paleozoic Lhasa Terrane Through Detrital Zircon Mixing Modeling
Paleogeographic Reconstruction of the Paleozoic Lhasa Terrane Through Detrital Zircon Mixing Modeling
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DOI：
10.1029/2022gl100160
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发表时间：
2022-10
影响因子：
5.2
通讯作者：
Wang Xu;N. Hughes;W. Zhang
中科院分区：
文献类型：
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作者：
Wang Xu;N. Hughes;W. Zhang
此前被认为是拉萨地体与澳大利亚西北部之间联系的诊断的中元古界晚期碎屑锆石（DZ）年龄群出现在冈瓦纳的其他成分中，从而掩盖了拉萨地体在冈瓦纳中的古地理位置。在此，我们收集了拉萨地区和潜在源区的大n（n ≥ 300）DZ U-Pb数据，并尝试通过DZ混合模型合成拉萨DZ年龄谱。我们的模拟结果支持石炭-二叠纪拉萨盆地接收来自澳大利亚西北部（主要是珀斯盆地）的沉积物，而不是印度或非洲。结合冈瓦纳东部北方边缘的地层学和古生物学证据，将古生代拉萨古陆定位在澳大利亚和印度边界附近。该研究表明，基于大n DZ数据的DZ混合建模方法可以有效地用于约束大陆的古地理重建。
A late Mesoproterozoic detrital zircon (DZ) age population, which was previously considered diagnostic of a link between the Lhasa terrane and northwest Australia, occurs in other Gondwanan components, thus obscuring the paleogeographic position of the Lhasa terrane in Gondwana. Here we compiled large‐n (n ≥ 300) DZ U‐Pb data from the Lhasa terrane and potential source regions in various proposed reconstructions, and attempted to synthesize the Lhasa DZ age spectra through DZ mixing modeling. Our modeling results support the Permo‐Carboniferous Lhasa terrane having received sediment from NW Australia (mainly the Perth basin) rather than India or Africa. This, in combination with stratigraphic and paleontological evidence from the northern margin of eastern Gondwana positions the Paleozoic Lhasa terrane adjacent to the boundary between Australia and India. This study suggests that the DZ mixing modeling method based on large‐n DZ data can be used effectively for constraining paleogeographic reconstruction of continents.