华北龙山地区青白口系混积岩层序地层格架及发育模式

doi:10.11743/ogg20220405

Abstract

Abstract:

The Neoproterozoic in the Longshan area， North China， is well exposed. With clastic rocks and carbonates developed successively from bottom to top， the strata serves as an ideal subject for the study of sequence stratigraphic framework and sedimentary facies evolution， which has been considered significant to the paleogeographic reconstruction of North China. Field and lab analyses of lithologic characteristics and sedimentary sequences of the strata are combined with the regional tectonic movement to establish the isochronous sequence stratigraphic framework， analyze the sedimentary facies evolution， and build up the sequence stratigraphic development model. The results show that according to the unconformities and lithologically abrupt interfaces， the Neoproterozoic Qingbaikouan System can be divided into three third-order sequences from bottom to top： the SQ₁（Xiamaling Formation）， SQ₂ （Changlongshan Formation） and SQ₃ （Jingeryu Formation）， each consisting of transgressive systems tract （TST） and highstand systems tract （HST）. The SQ₁ and SQ₂ sequences are mainly composed of clastic rocks indicating sufficient input of terrigenous clastics. The SQ₃ sequence is dominated by mixed siliciclastic-carbonate rocks against a relatively clear water depositional setting. The lithological characteristics， sedimentary structures and superposing styles， all point to shallow sea shelf facies for the SQ₁-TST， and subtidal sand flat and intertidal mixed sand-mud flat for the SQ₁-HST. The SQ₂-TST mainly develops subtidal sand flats and tidal channels， while SQ₂-HST mainly develops intertidal mixed sand-mud flats and supratidal mud flat. The SQ₃-TST develops subtidal sandy shoal and argillaceous limestone flat， while SQ₃-HST mainly develops intertidal dolomitic limestone flat and supratidal calcareous and argillaceous dolomite flat. Based on the understanding， a sequence stratigraphic development model of mixed siliciclastic-carbonate rocks dominated by tidal flat-shallow sea shelf facies is established， indicating the possibility of an open epicontinental sea with gentle slopes.

Key words: tidal flat facies, sequence stratigraphic framework, sequence stratigraphic development model, mixed siliciclastic-carbonate rock, Qingbaikouan System, Neoproterozoic, Longshan area, North China

CLC Number:

TE121.3

Qin Zhang, Chen Zhou, Hanyun Tian, Xiaomin Zhu, Xinsong Wu, Zeping Song, Kai Wang. Sequence stratigraphic framework and model of mixed siliciclastic-carbonate rocks in the Qingbaikouan System， Longshan area， North China[J]. Oil & Gas Geology, 2022, 43(4): 792-803.

Figures/Tables 9

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Table 1

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样品号	矿物组分含量/%
样品号	石英	钾长石	斜长石	方解石	赤铁矿	黄铁矿	针铁矿	粘土矿物
L1	70.3	2.5	0	0	8.2	0	0	19.0
L7	60.3	0	1.8	3.2	16.1	3.0	0	15.7
L3	50.6	0	0	0	20.1	3.3	5.9	20.1
L4	68.2	0	0	0	21.4	3.5	0	6.9
L5	70.6	0	0	0	14.6	5.5	0	9.3
L8	70.9	0	0	0	14.9	1.3	0	12.9
L2B	56.3	2.9	0	5.0	26.5	5.2	0	4.1
L2E	44.5	2.1	0	4.0	22.2	4.2	4.3	18.7
L2F	62.1	0	2.2	8.8	13.4	1.9	0	11.6
L2H	51.8	0	2.1	12.3	15.7	2.4	0	15.7

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Sequence stratigraphic framework and model of mixed siliciclastic-carbonate rocks in the Qingbaikouan System， Longshan area， North China

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