Rift一Faultings of Hercynian一Indosinian Epoch of Western Qingling Orogenic Belt and Its Relationship with Palaeotethys

Fang Guoqing; Zhang Xiaobao; Li Yuci

During Hercynian一Indosinian Epoch,Western Qinling Mt. was located on the margin of Palaeotethys where developed three time rift一faultings developed(1. Devonian,2. Carboniferous,3. Permian一Triassic )that caused the strata distributed in the form of belts and shallow一water and deep一water sediments appeared at intervals on the plane. Every rift一faulting can be divided into three stages; rift一faulting stage,calm stage and compressional stage. During rift一faulting stage carbonate plateform rifted and depressed,deep一water trough basins were formed. Depositional sequence from shallow to deep water contains several layers of olistro一gravity current sediments which consist chiefly of olistromes, debris flow deposits and turbidites. Its compositions are not complex,mainly coming from adjacent plateform and their provenances are linear not point. It is spectacular that giant carbonate olistoliths were formed that are several tens of meters to one thousand meters in diameter. During calm stage the basin was gradually filled to form up一shallowing sequence. During compressional stage the sediments of thousands of meter in basins were compressed and folded to deposite piedmont molase facies and continental一oceanic alternative facies. The alteration of rift一faulting and compressive stages made rift一faulting happened periodicalvy. Synsedimentary faults are the main structure which controlled olistro一gravity current complex sediments.

Lanzhou Institute of Geology, Chinese Academy of Sciences, 730000

Publish Date: 1994-09-10

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Abstract: During Hercynian一Indosinian Epoch,Western Qinling Mt. was located on the margin of Palaeotethys where developed three time rift一faultings developed(1. Devonian,2. Carboniferous,3. Permian一Triassic )that caused the strata distributed in the form of belts and shallow一water and deep一water sediments appeared at intervals on the plane. Every rift一faulting can be divided into three stages; rift一faulting stage,calm stage and compressional stage. During rift一faulting stage carbonate plateform rifted and depressed,deep一water trough basins were formed. Depositional sequence from shallow to deep water contains several layers of olistro一gravity current sediments which consist chiefly of olistromes, debris flow deposits and turbidites. Its compositions are not complex,mainly coming from adjacent plateform and their provenances are linear not point. It is spectacular that giant carbonate olistoliths were formed that are several tens of meters to one thousand meters in diameter. During calm stage the basin was gradually filled to form up一shallowing sequence. During compressional stage the sediments of thousands of meter in basins were compressed and folded to deposite piedmont molase facies and continental一oceanic alternative facies. The alteration of rift一faulting and compressive stages made rift一faulting happened periodicalvy. Synsedimentary faults are the main structure which controlled olistro一gravity current complex sediments.

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Rift一Faultings of Hercynian一Indosinian Epoch of Western Qingling Orogenic Belt and Its Relationship with Palaeotethys

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