The Petrogenesis of Late Mesozoic Volcanic Rock and the Contributions from Ancient Micro-Continents: Constraints from the Zircon U-Pb Dating and Sr-Nd-Pb-Hf Isotopic Systematics
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摘要: 系统的元素及多元同位素地球化学研究表明, 以西乌珠穆沁旗地区和塔河地区为代表的部分大兴安岭晚中生代火山岩地幔源区组分中存在明确的古老地块物质贡献.与大兴安岭其他地区晚中生代火山岩源区组分主要为新生地壳物质特征相比, 塔河火山岩中的碎屑锆石记录了晚元古代和早古生代年龄; 配套的微量元素和多元同位素特征则清晰地指示了上述两个地区火山岩的源区组分是在继承古老地块富集地幔的基础上叠加了古生代岛弧等新生地壳物质.上述研究首次为兴蒙造山带内存在前寒武古老地体以及该造山带组成特征提供了明确和系统的深部地球化学制约.晚中生代全球深部事件以及蒙古-鄂霍茨克洋闭合后的伸展作用, 触发岩石圈地幔部分熔融, 是本区晚中生代强烈火山活动成因可能的地球动力学背景.
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关键词:
- 中生代火山岩 /
- 源区特征 /
- 古老地块 /
- Sr-Nd-Pb-Hf同位素 /
- 大兴安岭
Abstract: Comprehensive geochemical investigations on the Late Mesozoic volcanic rocks from Tahe and Xiwu areas, Great Xing'an range reveal that the mantle sources for these rocks are of attributes of old continent blocks, while the mantle sources for the coeval volcanic rocks from other area show juvenile features.The detrital zircons from Tahe volcanic rocks have records of Late Proterozoic and Early Paleozoic.Trace elements and Sr, Nd, Pb and Hf isotopic features imply that the mantle sources for these two volcanic fields were inherited from enriched lithospheric mantle beneath old blocks with overprint of subducted juvenile island arc materials.This study provides solid deep geochemical constraints on the existence of Precambrian blocks among the Paleozoic Xingmeng orogen.During the Late Mesozoic, with the closure of the Mongol-Okhotsk and Mesozoic global event, regional extensional geological setting developed in these regions, which trigged decompressional melting of the lithospheric mantle and caused the voluminous eruption of volcanic rocks.-
Key words:
- Mesozoic volcanic rocks /
- source features /
- old blocks /
- Sr-Nd-Pb-Hf isotopes /
- Great Xing'an range
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图 大兴安岭及其邻近地区中生代火山岩分布简图
Fig. . Geological map showing the distribution of the Late Mesozoic volcanic rocks in the northern Great Xing'an range and its adjacent regions
图 主要氧化物含量随SiO2含量的变化
Fig. . The correlation between SiO2 and major oxides of volcanic rocks
图 火山岩稀土元素球粒陨石标准化和微量元素原始地幔标准化图
球粒陨石标准值采用Anders and Grevesse (1989), 原始地幔标准值采用Sun and McDonough (1989)
Fig. . Chondrite normalized rare earth elements patterns and primitive mantle normalized trace elements diagrams of the volcanic rocks
图 大兴安岭中生代火山岩Sr-Nd同位素相关图
大兴安岭其他地区火山岩据Zhang et al. (2008)
Fig. . Correlation diagram between the Sr and Nd isotopes for the volcanic rocks
图 大兴安岭中生代火山岩Pb同位素相关图
大兴安岭其他地区火山岩据Zhang et al. (2008)
Fig. . The Pb isotopes of the Mesozoic volcanic rocks in Great Xing’an range
图 6 大兴安岭地区中生代火山岩的Nd-Hf同位素相关图
大兴安岭其他地区火山岩据Zhang et al. (2008)
Fig. 6. Correlation diagram between the Nd and Hf isotopes for the Mesozoic volcanic rocks in Great Xing'an range
图 7 塔河火山岩中碎屑锆石的SHRIMP U-Pb年龄
Fig. 7. SHRIMP U-Pb dating of detrital zircon from Tahe volcanic rocks
图 8 塔河和西乌火山岩的Mg#、SiO2与εNd (t)的相关图
Fig. 8. Correlation diagram between Mg#, SiO2 and εNd (t)for the Tahe and Xiwu volcanic rocks
图 9 Nd亏损地幔模式年龄直方图
东北其他地区据Zhang et al. (2008), 华北北缘据周新华等(2001)
Fig. 9. Histogram of TDM for the volcanic rocks
表 1 大兴安岭塔河、西乌等地区中生代火山岩的主量、微量元素和Sr-Nd-Pb-Hf同位素组成
Table 1. The major, trace elements and Sr, Nd, Pb and Hf isotopic compositions of Tahe and Xiwu volcanic rocks
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