Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (3): 627-638.doi: 10.13278/j.cnki.jjuese.201603101

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LA-ICP-MS Zircon U-Pb Dating and Hf Isotope Feature of Gabbro Xenolith and Its Geological Significance in Huziyan Basalt of Daoxian County, Southern Hunan Province

Kong Hua1,2, Xu Mingzhu1,2, Zhang Qiang1,2, Tang Yuqiang1,2, Zhao Jiajin1,2   

  1. 1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Central South University, Changsha 410083, China;
    2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China
  • Received:2015-10-12 Online:2016-05-26 Published:2016-05-26
  • Supported by:

    Supported by Special Survey for Mineral Resources Evaluation from China Geological Survey(1212011121116, 1212011085372)

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Abstract:

There are many gabbro xenoliths in Huziyan alkali basalt pipe in Daoxian County. The geochemical analysis of one gabbro dating sample show that it has high content of K2O, Fe2O3 and TiO2, compared with other gabbro samples, which suggests that the gabbro xenolith is product of crystallization differentiation of late-stage magma. The K* value (2KN/(TaN+LaN)) is 7.60 (>1), displaying the magma source experienced metasomatism. The Nb* value(2 NbN/(KN +LaN)) is 0.11(<1), implying crust contamination during basic magma intrusion. Zircon grains are chosen from gabbro xenolith for LA-ICP-Ms U-Pb dating and Hf isotope analysis. Zircon grains in the gabbro have clear crystallization zoning, the ratio of Th/U is 0.91~4.35, these features imply that these zircon grains have magmatic origin. The average age of 206Pb/238U is (201.50±0.53) Ma(1σ, MSWD=4.6), which represents the emplacement age of the gabbro xenolith. According to Hf isotope compositions, the calculated model age is 751 Ma, indicating the earlier crustal material gave contributions to source area, the values of εHf(t) are -0.88~4.45, in the figure of εHf(t)-t, the points of zircon grains lie in the area neighbored to evolution curve of chondrite mantle, which are different apparently from their Nd isotope geochemistry. Geochemical characteristics show that the deeply strong material exchange progress between deep crust and mantle in southern Hunan area. In Late Indosinian epoch, there occurred mantle uplift induced by partial extensions, which resulted in progressively the mantle melting to from gabbro magma. The gabbro magma underplated at the bottom of lithosphere and became one part of its consistent.

Key words: gabbro xenoliths, zircon U-Pb dating, Hf isotope tracing, Daoxian County

CLC Number: 

  • P588.124

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