Tectonic-depositional Environment and Proto-type Basin Evolution of the Cambrian in the Tarim Basin

Abstract

Abstract:

The Cambrian carbonate is the objective exploration strata in the Tarim Basin recently, and the restoration of the proto-type basins is the foundation for the research of the tectonic evolution and petroleum exploration. Based on the newest data of drillings, seismic profiles and outcrops, with the analysis of sedimentary facies and the combination of basins and orogenic belts, this paper reconstructed the Cambrian tectonic-depositional environment of the Tarim Basin and established the models of basin fill processes, by employing the method of “point→line→face”. The Cambrian of the Tarim Basin underwent a complete transgressive-regressive cycle which consisted of two secondary cycles which are the rapid transgression in the early of the Early Cambrian→the regression in the Middle Cambrian and the slow transgression in the Late Cambrian→the regression at the end of the Cambrian. The two secondary cycles responded to the two stages of sedimentary evolution, respectively: the Taxi intra-cratonic depression experienced the evolution from the clastic onshore facies-open shelf facies in the Early Cambrian→the restricted platform facies in the Early Cambrian→the evaporative platform facies in the Middle Cambrian and the restricted platform facies in the Late Cambrian→the exposed unconformity at the end of the Cambrian;the Tadong cratonic margin depression developed the basin facies and underwent the lithofacies evolution from the siliceous mudstone→the limestone thinly interbedded with clay-silt rock→the carbonate rock. The characteristics and evolution of the Cambrian proto-type basins of the Tarim Basin were controlled by the extension of the Rodinia supercontinent and the tectonic-depositional pattern of the Tarim Basin experienced the transition from the pattern of the end of the Sinian which was differentiated from north to south to the pattern of the Middle-Late Cambrian which was differentiated from west to east.

Key words: tectonic-depositional environment, proto-type basin, Cambrian, Tarim Basin

CLC Number:

TE121.1

GAO Huahua, HE Dengfa, TONG Xiaoguang, WEN Zhixin, WANG Zhaoming. Tectonic-depositional Environment and Proto-type Basin Evolution of the Cambrian in the Tarim Basin[J]. Geoscience, 2017, 31(01): 102-118.

Figures/Tables 13

Fig.1 Tectonic units and of study materials in the Tarim Basin and its adjacent areas

Table 1 Stratigraphic divisions and comparisons of the Cambrian in the Tarim Basin and its adjacent areas

Fig.2 Typical rock types and lithofacies of the Cambrian in the Tarim Basin

Fig.3 Tectonic-depositional environment of the early stage of the Early Cambrian in the Tarim Basin

Fig.4 E-W sedimentary profile of the Cambrian in the Tarim Basin

Fig.5 E-W sedimentary profile of the Cambrian in the Tarim Basin

Fig.6 N-S sedimentary profile of the Cambrian in the Tarim Basin

Fig.7 N-S sedimentary profile of the Cambrian in the Tarim Basin

Fig.8 Seismic stratigraphic structures of the Cambrian platform margin belt in the Gucheng(a) and Luoxi(b) areas

Fig.9 Tectonic-depositional environment of the middle and late stages of the Early Cambrian in the Tarim Basin

Fig.10 Tectonic-depositional environment of the Middle Cambrian in the Tarim Basin

Fig.11 Tectonic-depositional environment of the Late Cambrian in the Tarim Basin

Fig.12 E-W evolution profile of the sedimentary filling of the Cambrian in the Tarim Basin

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