Genesis of the Baima layered intrusion in the Emeishan Large Igneous Province

被引：0
|
作者：
Tang Q. [1 ]
Bao J. [1 ]
Dang Y. [1 ]
Su T. [1 ]
Xu S. [1 ]
机构：
[1] Key Laboratory of Mineral Resources in Western China (Gansu Province), School of Earth Sciences, Lanzhou University, Lanzhou
来源：
Yanshi Xuebao/Acta Petrologica Sinica | 2020年 / 36卷 / 07期
关键词：
Baima intrusion; Emeishan Large Igneous Province; Fe-Ti-V oxide deposit; Marble assimilation; Petrogenesis;
D O I：
10.18654/1000-0569/2020.07.03
中图分类号：
学科分类号：
摘要：
Emeishan Large Igneous Province (LIP) is located in the western margin of the Yangtze Block, which is related to the Emeishan mantle plume in Late Permian. Several layered mafic-ultramafic intrusions host world-class Fe-Ti-V oxide ore deposits in this area. Baima layered intrusion is one of the mafic-ultramafic intrusions that host giant Fe-Ti-V oxide deposit in the Emeishan LIP. The close relationship of the whole-rock MgO contents with Cr and Ni concentrations in olivine gabbros and troctolites of the Baima intrusion indicate that its parental magma underwent extensive fractional crystallization. Primitive mantle-normalized trace elements and chondrite-normalized rare earth elements patterns of the samples from the Baima intrusion show positive Sr, Eu, and Ti anomalies, and negative Zr and Hf anomalies, and either positive or negative Nb and Ta anomalies, which is related to the accumulation of magnetite, clinopyroxene and plagioclase in the Baima intrusion. The (87Sr/86Sr)i ratios of the samples range from 0. 704232 to 0. 704855 with a mean value of 0. 704706, and their εNd (t) values vary between 1. 40 and 3. 94 with an average value of 2. 41. The Sr-Nd isotopes of the samples all fall in the ranges of Emeishan picrite and high-Ti basalts. The mixing calculation displays that the Baima parental magma had been contaminated by 10% ~30% bulk assimilation of the siliceous marble country rocks. Therefore, the formation of the Baima Fe-Ti-V oxide deposit is controlled by many factors such as the compositions of the parental magma, fractional crystallization and the assimilation of the marble country rocks. © 2020 Science Press. All rights reserved.
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页码：1973 / 1985
页数：12
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  • [1] Bai ZJ, Zhong H, Zhu WG., Redox state of mantle-derived magma and constraints on the genesis of magmatic deposits, Acta Petrologica Sinica, 35, 1, pp. 204-214, (2019)
  • [2] Barnes SJ, Zientek M, Severson MJ., Ni, Cu, Au, and platinum-group element contents of sulphides associated with intraplate magmatism: A synthesis, Canadian Journal of Earth Sciences, 34, 4, pp. 337-351, (1997)
  • [3] Bindeman IN, Davis AM, Drake MJ., Ion microprobe study of plagioclase-basalt partition experiments at natural concentration levels of trace elements, Geochimica et Cosmochimica Acta, 62, 7, pp. 1175-1193, (1998)
  • [4] Chen FW., Petrologic study on Baima ore-bearing layered mafic-ultramafic intrusion, Acta Petrologica Sinica, 6, 4, pp. 12-26, (1990)
  • [5] Chen LM, Song XY, Zhu XK, Zhang XQ, Yu SY, Yi JN., Iron isotope fractionation during crystallization and sub-solidus re-equilibration: Constraints from the Baima mafic layered intrusion, SW China, Chemical Geology, 380, pp. 97-109, (2014)
  • [6] Chen LM, Yi JN, Song XY, Yu SY, She YW, Xie W, Luan Y, Xiang JX., Petrogenesis of the Heigutian Ti-V-magnetite ore-bearing layered intrusion, the inner zone of the Emeishan large igneous province, Acta Petrologica Sinica, 30, 5, pp. 1415-1431, (2014)
  • [7] Chung SL, Jahn BM., Plume-lithosphere interaction in generation of the Emeishan flood basalts at the Permian-Triassic boundary, Geology, 23, 10, pp. 889-892, (1995)
  • [8] Dang YX., Study on the metallogenesis of the Baima ultra-large V-Ti-magnetite deposit in the Emeishan large igneous province, SW China, (2018)
  • [9] DePaolo DJ, Wasserburg GJ., Petrogenetic mixing models and Nd-Sr isotopic patterns, Geochimica et Cosmochimica Acta, 43, 4, pp. 615-627, (1979)
  • [10] Ganino C, Arndt NT, Zhou MF, Gaillard F, Chauvel C., Interaction of magma with sedimentary wall rock and magnetite ore genesis in the Panzhihua mafic intrusion, SW China, Mineralium Deposita, 43, 6, pp. 677-694, (2008)
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