Geological features of opening-closing tectonics at different spatiotemporal scales

doi:10.13745/j.esf.2020.1.27

Abstract

Abstract:

“Opening-closing” tectonics is a new hypothesis for studying the opening and closing movements and evolution of the earth. Different spatiotemporal opening-closing tectonics have different geological features that need to be studied from different perspectives. In this paper, we demonstrated the applications of opening-closing tectonic theory in geotectonic division, seismic activity and interpreting modern geodesy results, by the examples of large opening-closing tectonic zones in the Mediterranean and medium sized in the eastern Dabie orogenic belt. The results showed that (1) the bordering regions of Asia, Europe and Africa can be divided into six tectonic assemblages: Russian, African and North, Central, South and East Asian tectonic assemblages; (2) earthquakes in the bordering regions are mainly distributed in Cenozoic opening-closing tectonic transition zones between tectonic assemblages; (3) the seismic profile and focal mechanism study indicated that the current tectonic movement in the Mediterranean-Turkey-Iran-Afghanistan tectonic transition zone is dominated by “closing” motion; and (4) modern crustal deformation observations around the eastern Dabie orogenic belt, such as ground tilt and strain in the Shizishan, Huangmei and Macheng areas, and observations from GNSS and mobile gravity surveys in the area, indicate a low tendency for tectonic evolution from “closing” to “opening” on a short time scale, suggesting the “opening-closing” movement can be a common mechanism for some correlated tectonic events occurred simultaneously in the region.

Key words: tectonic division, opening-closing tectonic, earthquake, crustal deformation observation, Dabie orogenic belt

CLC Number:

P542

WANG Jie, WU Haibo, LU Xiaofei, LI Xianrui. Geological features of opening-closing tectonics at different spatiotemporal scales[J]. Earth Science Frontiers, 2020, 27(1): 260-269.

Figures/Tables 9

Fig.1 Geotectonic units in the bordering regions of Asia, Europe and Africa

Fig.2 Tectonic divisions in the bordering regions of Asia, Europe and Africa. Modified from [12].

Fig.3 The distribution of earthquakes above magnitude 5 in the bordering regions of Asia, Europe and Africa since 1970 (The earthquakes data is derived from https://earthquake.usgs.gov)

Fig.4 Mechanism of earthquakes above magnitude 5 in Mediterranean region (The mechanism data is derived from https://www.globalcmt.org/)

Fig.5 Seismic activity profile across the Eurasian seismic belt (profile location shown in Fig.3)

Fig.6 Map showing the structural outline and locations of observation stations in the eastern Dabie orogenic belt

Fig.7 Crustal deformation curves around the eastern Dabie orogenic belt

Fig.8 Comparison of GNSS principal strain rates around the Dabie orogenic belt around 2016

Fig.9 Changes of mobile gravimetric measurements around the Dabie orogenic belt from 2016 to 2018

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