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Late Jurassic-Early Cretaceous tectonic switching in Liaodong Peninsula of the North China Craton and the implications for gold mineralisation

引用

Science China Earth Sciences 2021年第9期64卷 1537-1556页

作者： Dan-Ping YAN Ruoyan KONG Xiaoyu DONG Liang QIU Huilong LIU State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesBeijing100083China Geophysical Investigation Centre China Geological SurveyLangfang065000China

Constraining the processes of deformation during tectonic switching from compression to extension is difficult because of the scarcity or absence of associated sedimentary and magmatic rocks and weak *** east margin of the eastern North China Craton experienced Early to Middle Jurassic compression and Early Cretaceous ***,the period of tectonic quiescence lasting~13 million years(between 153 and 140 Ma)during which this transition occurred is poorly *** paper reports the identification of small-scale N-S-trending thrust and sinistral strike-slip faults(TSS)and NWtrending thrust and dextral strike-slip faults(TDS)in the Tongyuanpu-Aiyang region,which is part of the northern Liaodong *** of the tectonic stress field using striations,fault planes and kinematics reveals a NW-SE-oriented maximum principal axis(σ1),and sub-horizontalσ2 andσ*** of N-S-trending TSS and NW-trending TDS were arranged with right stepping and resulted in local uplift and erosion at the junctions between fault terminations,which partitioned the Early and Middle Jurassic basins into residual smaller volcanic-sedimentary *** basins were unconformably overlain by small Early Cretaceous volcanic-sedimentary basins,such as those at Tongyuanpu and *** ages and the timing of basin formation constrain the initiation of tectonic switching to 156–153 Ma,and its termination to 140–139 *** suggest that R-R’Riedel shears controlled the formation of the N-S-trending TSS and NW-trending *** R-R’shears were produced by continued sinistral strike-slip and northward growth along the Bohai Bay segment of the Tan-Lu fault zone during the Late Jurassic to early Early Cretaceous,simultaneous with a gradual weakening in the tectonic stress field during a switch in the direction of subduction of the Palaeo-Pacific plate from NW-ward to *** tectonic switching might have promoted the dissolution of gold and migra

关键词： Switch from compression-extension Liaodong Peninsula Late Jurassic-Early Cretaceous R-R’shear Tan-Lu fault zone gold mineralisation

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