The Gravity Flow Sedimentation of the Nanyangshan Formation in the Zhen' an- Shanyang District, Shaanxi and Its Significance

Zhang Fuxin; Ma Jianqin

A series of gravity flow sediments composed of terrigenous fine-grained clastic rocks and carbonaterocks, which are the predominant and index lithofacies of the both limited platform basin and front plat-form slop sediments, occur in the Nanyangshan Formation of the Zhen' an-Shanyang district in Shannxi.It is the time space unity among the gravity flow sedimentation, volcano-hydrothermal activity, contem-peraneous fault activity and paleogeography differiating, that gives birth to the limited platform basinsediments dominatedly by gravity flow, with the distinguished features of the terrigenous fine-grainedclastic rocks covered frequently by the carbonate rocks, changing from west to east, containing minorvolcanic tuffaceous and sedimentary-diagentic pyrite, which is the source-bed of the micro-dissiminatedstrata-bound Sb-Au deposits in this district.

1 Department of Geology, Northwest University, Xi'an 710069;

2 Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002

Received Date: 1995-11-06

Publish Date: 1997-09-10

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Abstract: A series of gravity flow sediments composed of terrigenous fine-grained clastic rocks and carbonaterocks, which are the predominant and index lithofacies of the both limited platform basin and front plat-form slop sediments, occur in the Nanyangshan Formation of the Zhen' an-Shanyang district in Shannxi.It is the time space unity among the gravity flow sedimentation, volcano-hydrothermal activity, contem-peraneous fault activity and paleogeography differiating, that gives birth to the limited platform basinsediments dominatedly by gravity flow, with the distinguished features of the terrigenous fine-grainedclastic rocks covered frequently by the carbonate rocks, changing from west to east, containing minorvolcanic tuffaceous and sedimentary-diagentic pyrite, which is the source-bed of the micro-dissiminatedstrata-bound Sb-Au deposits in this district.

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The Gravity Flow Sedimentation of the Nanyangshan Formation in the Zhen' an- Shanyang District, Shaanxi and Its Significance

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