Characteristics and Geological Significances of Xuzhuang Formation Carbonate Tempestites in Ordos Basin

Abstract

Abstract:

The tempestites which developed in the Cambrian Xuzhuang Formation in Ordos Basin mainly includes many sedimentary structures,such as erosional base, storm flow-generated gravelstones,hummocky and swaley cross-stratification. Sedimentary structure in different conditions can form different storm sedimentary sequences. The ideal storm sedimentary sequence includes five units, from bottom to top, which are composed of A-erosional base and conglomerates representing the deposition of storm peaks and decay period,B-graded bedding with grain-size decreasing upward when storm weakened, C-parallel lamination,D-hummocky cross-stratification representing fluid property changes from density flow to tractive current in storm attenuation period, E-mudstone with horizontal bedding and micrite limestone forming in storm rest period.Based on outcrop observation in the field, there are five types of depositional sequence. Different types of depositional sequence have different sedimentary characteristics and different sedimentary environments. The carbonate tempestites in Cambrian Xuzhuang Formation have important significances in evolution of palaeoblocks and restoration of ancient latitudes, and in research of Ordos Basin palaeogeography.

Key words: Ordos Basin, Xuzhuang Formation, storm deposit, tempestite, storm sedimentary sequence

CLC Number:

TE121.3

BAI Yiming, ZHANG Yuanfu, HU Chenlin, WANG Zhen. Characteristics and Geological Significances of Xuzhuang Formation Carbonate Tempestites in Ordos Basin[J]. Geoscience, 2017, 31(06): 1233-1232.

Figures/Tables 5

Fig.1 Main outcrops in the study area of Ordos Basin and stratigraphic division of Cambrian

Fig.2 Storm sedimentary structures of Xuzhuang Formation western and eastern margin of Ordos Basin

Fig.3 Ideal storm sedimentary sequences

Fig.4 Types of storm sedimentary sequences in Xuzhuang Formation, western and eastern margins of Ordos Basin

Fig.5 Outcrops and microscopic characteristics of different storm sedimentary sequences of Xuzhuang Formation in western and eastern margin of Ordos Basin

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