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塔里木西南缘棋盘河乡玄武岩锆石U-Pb年代学和地球化学研究
引用本文:邵铁全,朱彦菲,靳刘圆,朱志新,李平,刘鑫. 塔里木西南缘棋盘河乡玄武岩锆石U-Pb年代学和地球化学研究[J]. 地质科学, 2015, 0(4): 1120-1133. DOI: 10.3969/j.issn.0563-5020.2015.04.006
作者姓名:邵铁全  朱彦菲  靳刘圆  朱志新  李平  刘鑫
作者单位:1. 长安大学地球科学与资源学院 西安 710054;2. 新疆大学 乌鲁木齐 830046;3. 新疆地质调查院 乌鲁木齐 830000
摘    要:通过对塔西南棋盘河乡尤勒巴斯地区玄武岩进行了LA-ICP-MS 锆石 U-Pb同位素研究。获得锆石206 Pb/238 U同位素年龄为298.3±2.8 Ma(MSWD=2.6), 代表玄武岩的结晶年龄。本次研究的玄武岩具有高的Ti、Nb: Ti/Y为513.86~577.35、Nb含量为28×10-6~35.7×10-6、La/Nb为5.06~6.25以及低的Zr/Nb比值(10~10.86), 表明该玄武岩的形成与富集岩石圈地幔有关。而相对低的Nb/U(近30)和Ce/Pb(近15)比值, 指示研究区玄武岩来自大陆岩石圈或受一定程度的地壳混染。尤勒巴斯地区玄武岩具有高TiO2和P2O5, 富集轻稀土和Rb、Ba, 指示具有地幔柱的地球化学成分特征。基于塔里木地区大规模的火山岩喷发以及富集不相容元素的地球化学特征和岩相古地理特征支持, 塔西南玄武岩可能是由地幔柱火山作用, 或由于地幔柱的供热和上升导致富集的岩石圈地幔部分熔融而形成。

关 键 词:塔里木盆地  地球化学特征  玄武岩  地幔柱岩浆作用
收稿时间:2015-03-20
修稿时间:2015-03-20;

Zircon U-Pb dating and geochemical of basalts in Qipan Country of Northwest Tarim Basin
Shao Tiequan,Zhu Yanfei,Jin Liuyuan,Zhu Zhixin,Li Ping,Liu Xin. Zircon U-Pb dating and geochemical of basalts in Qipan Country of Northwest Tarim Basin[J]. Chinese Journal of Geology, 2015, 0(4): 1120-1133. DOI: 10.3969/j.issn.0563-5020.2015.04.006
Authors:Shao Tiequan  Zhu Yanfei  Jin Liuyuan  Zhu Zhixin  Li Ping  Liu Xin
Affiliation:1. School of Earth Sciences and Resources Management, Chang'an University, Xi'an 710054;2. Xinjiang University, Ürümqi 830046;3. Xinjiang Institute of Geological Survey, Ürümqi 830000
Abstract:The age of basalts in the Youlebasi of Qipan Country in the Southwest of Tarim Basin by zircon LA-ICP-MS U-Pb dating is 298.3±2.8 Ma(MSWD=2.6), which represents the crystallization age of the volcanic rocks erupted in Early Permian. The basalts have the characteristics of high Ti(Ti/Y=513.86~577.35), high Nb(28×10-6~35.7×10-6) and low Zr/Nb ratios(10~10.86), which indicates that the basalts were derivate from enrich mantle sources. While the slightly low Nb/U(~30)and Ce/Pb(~15)indicated that the basalts derivate from the continental lithosphere or subjected to some degree of crustal contamination. The Youlebasi basalts have higher TiO2 and P2O5 contents, enrich LREE, Rb and Ba, which indicates that basalts have geochemical characteristic of mantle plume. Based on large-scale volcanic eruption Tarim area and the characteristics of enrichment incompatible elements and facies paleogeography, the basalts in the Southwest of Tarim may be caused by volcanic of mantle plume or enrichment lithospheric mantle partial melting caused by rise and heat of mantle plume.
Keywords:Tarim Basin  Geochemistry  Basalt  Mantle plume magmatism
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