Early stage of Early Paleozoic orogenic event in western Yunnan Province, southeastern margin of Tibet Plateau
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摘要:
野外观察、LA-ICP-MS锆石U-Pb测年和Hf同位素分析结果表明：青藏高原东南缘滇西芒市地区存在奥陶系底砾岩与前寒武-寒武系之间的地层不整合；龙江眼球状片麻岩锆石边部U-Pb年龄约为502~518Ma，代表原岩花岗岩结晶时代；继承性锆石核部具有与拉萨地体相似的年龄谱，说明早古生代早期腾冲地体与拉萨地体属于统一陆块；锆石边部具有负的、变化范围较大的εHf(t) 值(-15.7~-2.0)，结合眼球状片麻岩野外、岩相学特征及区域构造背景说明原岩花岗岩来源于古老地壳部分熔融，并伴随不同程度幔源物质的注入，可能为岩浆弧的一部分。综合野外观察及锆石同位素研究结果，明确了青藏高原东南缘存在早古生代早期造山事件。与喜马拉雅、拉萨、羌塘等地体的同一时代构造事件对比，认为青藏高原东南缘滇西地区早古生代早期造山带为形成在冈瓦纳大陆北缘的安第斯型造山带的一部分，为认识冈瓦纳大陆北缘早古生代演化提供新的证据。
Abstract:Field investigation, LA-ICP-MS zircon U-Pb dating and Hf isotope composition analysis applied in this paper show that: In mangshi area, southeastern margin of the Tibet Plateau, Ordovician conglomerate are unconformable on Cambrian and Pre-Cambrian metamorphic rocks. Zircon rim U-Pb age of the augen gneiss collected from Longjiang area is 518~502Ma, representing the protolith granite crystallization time. The spectrum of U-Pb age for inherited zircons is similar with the Lhasa terrane, implicates that Tengchong terrane and Lhasa terrane belong to a unified continent during the early stage of Early Paleozoic. The feature of negative and large range of εHf(t) values (-15.7~-2.0) of zircon rims, combined with field obervition and petrographic study, shows that the protolith granite of the augen gneiss originated from old crustal injected by varing mantle components, may represent a part of a magmatic arc. Through field observations and zircon isotope analysis, we explicitly pointed to the existence of Early Palaeozoic orogenic event in southeastern margin of the Tibetan Plateau. Compared with the same period of tectonic events happened in Lhasa, Himalaya and Qiangtang terranes, we regard the Early Paleozoic orogenic belt in the southeastern Tibet Plateau is a part of the Andean-type Orogenic belt formed along the northern margin of Gondwana, provids new evidences for understanding the evolution of the Gondwana during Early Paleozoic.
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Key words:
- Southeastern Tibet Plateau /
- Western Yunnan /
- Early Paleozoic /
- Andean-type Orogen
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图 1
东冈瓦纳重建图(据Cawood et al. 2007)
Figure 1.
Reconstruction of East Gondwana (after Cawood et al., 2007)
图 3
潞西弯腰树地区地质简图(a)、A-A′剖面图(b) 及野外照片(c-f)
Figure 3.
Geological map (a), geologic cross section along A-A′ (b) and field photos (c-f) in Wanyaoshu, Luxi area
图 4
芒市北龙江地区眼球状片麻岩及其显微照片
Figure 4.
Augen gneiss in Longjiang, northern Mangshi and its photomicrograph
图 6
龙江眼球状片麻岩LA-ICP-MS U-Pb锆石测年谐和图
Figure 6.
Concordia diagrams of LA-ICP-MS U-Pb dated zircons for augen gneiss from Longjiang
图 7
龙江眼球状片麻岩锆石εHf(t)-t值相关图
Figure 7.
εHf(t) values vs. t diagram for augen gneiss from Longjiang
图 8
早古生代花岗岩中锆石核部碎屑锆石U-Pb同位素测年年代谱
Figure 8.
Zircon U-Pb age frequency diagrams for zircon cores in the Early Paleozoic granite
图 9
青藏高原南部早古生代早期造山事件记录
Figure 9.
Map showing records of the Early Paleozoic orogenic event in the southern Tibet Plateau
图 10
青藏高原南部早古生代演化模式图(据Cawood et al., 2007修改)
Figure 10.
Schematic illustrations of the tectonic evolution of southern Tibet during Late Proterozoic to Early Paleozoic time (modified after Cawood et al., 200)
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