The Taqian-Fuchun Mesozoic structural deformation and its controls on magmatism and minerlization, Northeast Jiangxi Province, South China
Abstract
The Mesozoic structural deformation is developed in the Taqian-Fuchun area, northeast Jiangxi Province, south China, in which a lot of deposits (spots) typified by the Zhuxi super-large W-Cu deposit, and intrusions with different occurrence are widely distributed. By means of regional structural deformation analysis, it is indentified that the Taqian-Fuchen thrust nappe (TFTN) is the primary deformation pattern supporting the main tectonic regime of the study area. The stripped sedimentary rocks from Late Paleozoic to Early Mesozoic bounded by faults formed several NE trending thrust slices consisting of horses of thrust system. The deformation pattern and geometry of faults and folds inside the thrust system are characterized by duplex. Three-level magma- and ore-controlling structures caused by TFTN are proposed as follows: (1)The deep level is the floor thrust surface of the duplex, which is migration pathway for the deep magma rising and also the emplacement space for large batholith; (2)The intermediate level involves multiple structural planes including imbricated faults, reformed surface of unconformity, lithologic interfaces between clastic and carbonate rocks, metamorphic schistosity plane and hinge zone of fold in the autochthonous, which are favorite places for the empacement of the granite pluton and W-Cu mineralization; (3)The shallow level is related to the fractured zone and cracks only for the emplacement of shallow dikes. Based on the chronology of granite intrusions and minerlization, it is concluded that the Middle and late Jurassic TFTN controlled the ~160Ma and ~150Ma magmatism and W-Cu mineralization. Combining with understanding of the Mesozoic tectonics of South China, the TFTN might be resulted from the lithosphere thickening in South China Block since Middle Jurassic caused by northwestward subduction of Palaeo-Pacific plate.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.T51E0309Z
- Keywords:
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- 8104 Continental margins: convergent;
- TECTONOPHYSICS;
- 8105 Continental margins: divergent;
- TECTONOPHYSICS;
- 8157 Plate motions: past;
- TECTONOPHYSICS;
- 8185 Volcanic arcs;
- TECTONOPHYSICS