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Volume 30 Issue 4
Aug 2019
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Journal of Earth Science  > 2019  >  30(4): 739-753.
Yong Huang, Chuan He, Neng-Song Chen, Bin Xia. Diabase Sills in the Outer Zone of the Emeishan Large Igneous Province, Southwest China: Petrogenesis and Tectonic Implications. Journal of Earth Science, 2019, 30(4): 739-753. doi: 10.1007/s12583-019-1241-x
Citation: Yong Huang, Chuan He, Neng-Song Chen, Bin Xia. Diabase Sills in the Outer Zone of the Emeishan Large Igneous Province, Southwest China: Petrogenesis and Tectonic Implications. Journal of Earth Science, 2019, 30(4): 739-753. doi: 10.1007/s12583-019-1241-x
shu

Diabase Sills in the Outer Zone of the Emeishan Large Igneous Province, Southwest China: Petrogenesis and Tectonic Implications

doi: 10.1007/s12583-019-1241-x
  • 1.

    School of Earth Sciences, China University of Geosciences, Wuhan 430074, China

  • 2.

    Guizhou Institute of Geological Survey, Guiyang 550081, China

  • 3.

    Center for Global Tectonics, China University of Geosciences, Wuhan 430074, China

More Information
  • Corresponding author: Neng-Song Chen
  • Received Date: 15 Dec 2018
  • Accepted Date: 12 May 2019
  • Publish Date: 01 Aug 2019
    Abstract
  • Compositionally and texturally zoned diabase dykes and sills occur in the outer zone of the Emeishan large igneous province (ELIP) in the southern Guizhou Province, Southwest China. Based on the detailed petrology, whole rock geochemistry, zircon U-Pb geochronology and Hf isotopes and clinopyroxene mineral compositions studies, we investigate a representative diabase sill in the Luodian region with a view to understanding its petrogenesis and tectonic implications. Formed as composite zoned sub-volcanic intrusion, the diabase sill is characterized by gabbros and diabases in the inner zone and amygdaloidal diabases sporadically in the chilled zone within the upper sill margin. The diabasic and gabbroic rocks are composed of quartz-free and quartz-bearing groups. The quartz-free group rocks have low SiO2 (45.7 wt.%-49.5 wt.%), moderate MgO (5.66 wt.%-7.88 wt.%), high TiO2 (2.54 wt.%-3.65 wt.%), and Ti/Y values (536-747), corresponding to high-Ti type rocks. The quartz-bearing group rocks have higher SiO2 (49.8 wt.%-51.7 wt.%) and lower MgO (4.23 wt.%-4.74 wt.%), higher TiO2 (3.16 wt.%-3.63 wt.%), but lower Ti/Y values (399-419) than the quartz-free group ones, and thus belong to the low-Ti type. Both groups of rocks are enriched in LREE and LILE with negative Nb-Ta anomalies, and show broad tholeiitic affinity. The precursor magma of the high-Ti rocks might have originated from a source composed of mantle plume and subcontinental lithosphere mantle components, with minor crustal contamination during ascending. The magma of the low-Ti rocks was produced by mingling of the high-Ti diabasic rocks with minor injected intermediate-acidic magma plugs or blebs, suggesting magma mingling as one of the effective ways to change the high-Ti to low-Ti rocks of the ELIP. The diabasic sill underwent a rapid cooling event probably in response to a rapid tectonic uplift event, which probably occurred in the waning stage of ELIP during transition between the Middle and Late Permian after the domal uplift induced by the mantle-plume or in the Late Jurassic.

     

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