Study on Sedimentology Characteristics of the Late Paleozoic Conglomerates from Daqingshan Coalfield, Inner Mongolia

ZHOU An chao; ZHAO Xing min; JIA Bing wen

There are 14 layers of sedimentogenic conglomerates in Late Paleozoic strata fro m Daqingshan coalfield, in which 8 layers of conglomerates belong to Late Carbon iferous strata and 6 layers belong to Permian strata. Based on the outcrop measu rement, petrologic and minerologic determination and the other analysis to these conglomerates, it and that almost all conglomerates in Late Carbonifero us strata are stable single-component conglomerates, the content of quartz sands tone and flint pebbles is higher than 93%. The biggest flat faces of all pebbles dip to the south and dip angle is between 5°-10°. The coarse quartz sandston e associated with conglomerates develop big low angle double directional cross b edding, and the environmental discriminant parameters show that the conglomerate s in Late Carboniferous was deposited in coastal environment. The pebbles in Permian are mainly complex component, especially the pebbles of two conglomerat e layers formed in the late time of Earlier-Permian and early time of Late-Permi an are as many as 15 kinds which are mainly that of medium-acidic volcanics and volcaniclastic rock, and also contain more pebbles of metamorphic rock and mediu m-acidic intrusive rock. The characteristics of all the conglomerate layers show that the conglomerates of Permian are the products of river deposit. The sedime ntary conglomerates in Late Paleozoic from Daqingshan coalfield was tightly rela ted to the rising of northern orogenic zone and deposited in foreland basin.

1 Dept. of Geology Northwest University,Xi'an 710069;

2 Institute of Mineral Deposits CAGS, Beijing 1000037;

3 Dept. of Earth Science Taiyuan University of Technology,Taiyuan 030024

Received Date: 1999-11-22

Rev Recd Date: 2000-03-01

Publish Date: 2000-06-10

Key words:

Abstract: There are 14 layers of sedimentogenic conglomerates in Late Paleozoic strata fro m Daqingshan coalfield, in which 8 layers of conglomerates belong to Late Carbon iferous strata and 6 layers belong to Permian strata. Based on the outcrop measu rement, petrologic and minerologic determination and the other analysis to these conglomerates, it and that almost all conglomerates in Late Carbonifero us strata are stable single-component conglomerates, the content of quartz sands tone and flint pebbles is higher than 93%. The biggest flat faces of all pebbles dip to the south and dip angle is between 5°-10°. The coarse quartz sandston e associated with conglomerates develop big low angle double directional cross b edding, and the environmental discriminant parameters show that the conglomerate s in Late Carboniferous was deposited in coastal environment. The pebbles in Permian are mainly complex component, especially the pebbles of two conglomerat e layers formed in the late time of Earlier-Permian and early time of Late-Permi an are as many as 15 kinds which are mainly that of medium-acidic volcanics and volcaniclastic rock, and also contain more pebbles of metamorphic rock and mediu m-acidic intrusive rock. The characteristics of all the conglomerate layers show that the conglomerates of Permian are the products of river deposit. The sedime ntary conglomerates in Late Paleozoic from Daqingshan coalfield was tightly rela ted to the rising of northern orogenic zone and deposited in foreland basin.

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Reference (8)

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Study on Sedimentology Characteristics of the Late Paleozoic Conglomerates from Daqingshan Coalfield, Inner Mongolia

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