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首页> 外文期刊>Journal of Asian earth sciences >Coupled detrital zircon U-Pb and Hf analysis of the Sibumasu Terrane: From Gondwana to northwest Thailand
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Coupled detrital zircon U-Pb and Hf analysis of the Sibumasu Terrane: From Gondwana to northwest Thailand

机译：偶联替代替代锆石U-PB和辛鲁摩地区的HF分析：从Gondwana到泰国西北部

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The evolution of the Sibumasu Terrane forms a principal component in the history of the Tethys Oceans with the northward movement of Gondwana-derived terranes creating the Asian continent that we recognise today. While there are various reconstructions for the palaeoposition of the Sibumasu Terrane during the Proterozoic and Paleozoic, the terrane is commonly placed outboard of the northwest Australian margin in the Gondwanan supercontinent. In this study, U?Pb and Lu?Hf isotopic information has been collected from detrital zircons of Paleozoic and Mesozoic sedimentary rocks obtained from the Sibumasu Terrane in northwest Thailand. This is the first zircon Hf analysis from these sedimentary sequences. These new data are statistically and visually compared with data from Sibumasu, Indochina, Sukhothai, West Burma and Tethyan Himalayas terranes along with the terranes of China, India and Western Australia. Our detrital data are consistent with other published data indicating consistent sources across the Sibumasu Terrane, inconsistent with composite terrane reconstructions. However, temporally, the detrital ages change from older Paleozoic sedimentary sequences (sourcing zircons from Neoproterozoic and older ?Gondwanan? sources) to latest Permian-Triassic sedimentary units with Indosinian zircon sources. This change is consistently reflected in this study through both the U?Pb ages and Hf signatures with Proterozoic age peaks characteristic of Gondwana and younger Indosinian sources being consistent with granitoids emplaced through the amalgamation of Thailand. The temporal changes in the isotopic systems reflect the movement of the Sibumasu Terrane from the northwest Australian margin of Gondwana to its collision with the terranes of present-day Asia.
机译：Sibumasu Terrane的演变在Thethys海洋的历史中形成了一个主要的成分，其中包括北方运动的北方运动，创造了我们今天认识的亚洲大陆。虽然在正常古古寺和古生代的Sibumasu Terrane的古代族地区有各种重建，但Terrane通常在贡瓦南覆盖的西北澳大利亚边缘舷外。在这项研究中，来自泰国西北部地区的Sibumasu Terrane获得的古生代和中生代沉积岩的碎古锆石，从InsoTopic岩石中收集了HF同位素信息。这是来自这些沉积序列的第一个锆石HF分析。与来自Sibumasu，Indochina，Sukhothai，West Burma和Tethyan Himalayas Terranes以及中国，印度和西澳大利亚的地区的数据进行统计和视觉上的数据。我们的纠纷数据与其他公布的数据一致，表明跨苏曼鲁地区的一致来源，与综合地区重建不一致。然而，在瞬间，邪恶年龄从较旧的古生代沉积序列（来自Neoproterozoice和旧的Zircons的Zircons，Gondwanan？来源）与Indosinian Zircon来源的最新二叠纪 - 三叠纪沉积单位。这一变化一直反映在这项研究中，通过Uα，PB年龄和HF签名与前古曲龄和年轻的吲哚氏菌属特征与泰国的胺类施加的花岗岩的特征一致。同位素系统的时间变化反映了Sibumasu Terrane从西北澳大利亚山地裕度的运动与当天亚洲地区的陆战碰撞。

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