19-21 November 2019, the Second International Workshop “International Tectonic Map of Asia (ITMA5000)” and the scientific conference “Asian Tectonics” were held at the Chinese Academy of Geological Sciences (Beijing, China).
Both events were organized by the Geological Survey of China and the CGMW Subcommission for South and East Asia and were held under the auspices of the Commission for the Geological Map of the World (CGMW). The previous First Workshop in October 2018 was a bilateral Sino-Russian event, participated by representatives of the CGMW Subcommission for South and East Asia (Chinese Academy of Geological Sciences and its Institute of Geology) and two Russian Subcommissions: Northern Eurasia (VSEGEI) and Tectonic Maps (Russian Academy of Sciences and VSEGEI). At the First Workshop, both sides exchanged proposals on the legend and map contents, as well as a plan for joint work on the project.
The Second Workshop was attended by 47 representatives from six countries. Most of the participants were from scientific institutions of the Chinese Academy of Geological Sciences, among which were the authors of the 2013 International Geological Map of Asia (IGMA5000). Foreign participants represented France (CGMW), Russia (VSEGEI and the CGMW Subcommission for Tectonic Maps), Vietnam (Geological Survey of Vietnam), Mongolia (Institute of Geology of the Mongolian Academy of Sciences), Japan (Geological Survey of Japan and Yamaguchi University). VSEGEI, as well as the CGMW Subcommission for Northern Eurasia, was represented by President of the CGMW Subcommission for Tectonic Maps, Academician A.I. Khanchuk (Advisor to the Directorate) and Secretary General of the CGMW Subcommission for Tectonic Maps, Dr. I. I. Pospelov (Research Associate at the Institute). In general, the workshop was led by the CGMW President Dr. Manuel Pubellier.
As part of the workshop on the Tectonic Map of Asia, the scientific session “Asian Tectonics” was simultaneously held, at which 15 reports were presented on some major issues of tectonics, magmatism, evolution and tectonic reconstructions of Asia.
ITMA5000 Workshop, after welcome remarks by the Deputy Director General of the Geological Survey of China, Dr. Li Jinfa, and Vice President of the Chinese Academy of Geological Sciences, Vice President of the CGMW Subcommission for South and East Asia, prof. Wu Zhenhan began with the presentation of the Tectonic Map of the Arctic (TeMAr) published in 2019 and a detailed examination of the legend for it. The presentation on behalf of VSEGEI and CGMW, voiced by I.I. Pospelov (Oleg PETROV, Sergey SHOKALSKY, Alexander KHANCHUK, Igor POSPELOV, Manuel PUBELLIER, Philippe ROSSI, Sergey KASHUBIN, Tatiana TOLMACHEVA “NEW TECTONIC MAP OF THE ARCTIC AND ITS LEGEND”) examined in detail the scientific content of the map, and placed an emphasis on the structure and content of the legend, as a result of many years of joint consultations of the TeMAr project member countries. The final part of the report contained new proposals on the ITMA5000 legend using the TeMAr legend and the version of the legend proposed by the Subcommission for South and East Asia for the International Tectonic Map of East and South Asia (ITMESA5000). Russian Subcommissions transformed the ITMESA5000 legend variant into the traditional form of presentation in maps (in separate blocks – periodicity of tectonic events, formation of sedimentary basins, age of the oceanic crust, sedimentary, magmatic and metamorphic formations, structural signs, etc.).
Immediately after the report, the Chinese colleagues propagated a new version of the ITMA5000 legend on ten sheets in the amount of thirty copies and distributed to the meeting participants for review during the scientific session.
Meeting participants. In the front row (from left to right): Dr. T. Narantsetseg (Institute of Geology, Mongolian Academy of Sciences), Dr. Nguyen Nhat Mai (Geological Survey of Vietnam), prof. Tran Wan Tri (Geological Survey of Vietnam), Dr. Li Jinfa (Deputy General Director of the Geological Survey of China, Executive Vice President of the Chinese Academy of Geological Sciences), Academician of the Academy of Sciences of the People's Republic of China Ren Jishun (Scientific Director of the Project), Dr. Manuel Pubellier (CGMW President), Academician A.I. Khanchuk (VSEGEI/RAS, President of the CGMW Subcommission for Tectonic Maps), Dr. I.I. Pospelov (VSEGEI/GIN, Secretary General of the CGMW Subcommission for Tectonic Maps), prof. K. Wakita (Geological Survey of Japan and Yamaguchi University), prof. Xiao Gui-I (Director, Institute of Geology, Chinese Academy of Geological Sciences)
The scientific session was held during the first day and the first half of the second day. It began with the presentation by Ts. Narantsetseg (Institute of Geology, MAS) “Tectonic divisions of the South Mongolian orogenic belt: problems of the basement blocks structure”, based on the latest results of the MAS Academician O. Tomurtogoo and dedicated to his memory. A number of presentations addressed the issues related to China tectonics: the Early Palaeozoic orogeny in Eastern Dzungaria (Dr. Zhao Lei, Secretary General of the Subcommission for South and East Asia); Caledonian orogen in South Qinlin; formation and evolution of the Archean crust in the North China Craton; growth, processing, metamorphism, and evolution of the Early Precambrian crust in the North China Craton; granitoids of Asia and their tectonic significance (Prof. Wang Tao, Deputy Director, Institute of Geology of the Chinese Academy of Geological Sciences, IGCP662 project manager).
A number of presentations were devoted to regional tectonics: tectonic evolution of the Tethyan domain in China; Early Mesozoic magmatism within the Tibetan Plateau; structure, displacement, and geodynamic cause of the Qiangtan overthrust in Tibet (Prof. Wu Zhenhan, Vice President, CGMW Subcommission for South and East Asia). Participants from the Geological Survey of Vietnam made two presentations: Palaeozoic tectonic-stratigraphic terranes in Southeast Asia; Palaeozoic and Mesozoic flora of Vietnam and related areas: towards the question of the relationship between Indochina and the composite Sino-Vietnamese terrane.
During the scientific session
The scientific session concluded with speeches by the CGMW President, Dr. M. Pubellier (“Structural Evolution of Southeast Asian Basins”) and the head of the working group on the International Geological Map of Asia IGMA5000 in the Pacific, prof. K. Wakita (“Phanerozoic geological history manifested in the Japanese islands”).
At the end of the scientific session, in the second half of 20 November, Dr. Pospelov spoke on behalf of two Russian Subcommissions with proposals for a new unified legend to the International Tectonic Map of Asia ITMA5000 (Oleg PETROV, Alexander KHANCHUK, Igor POSPELOV, Sergey SHOKALSKY “Proposals for the United ITMA-ITMESA Legend”). The report examined in detail the similarities and differences between the two legends, presented a way to transform the two legends into a single unified one for the project. After the report, there was a wide discussion on the legend, which continued on 21 November. The discussion was moderated by the President of the Commission for the Geological Map of the World, Dr. M. Pubellier. Such a discussion turned out to be extremely fruitful, because all of its participants could reflect their comments on a pre-printed version of the proposed legend. This greatly simplified the discussion of the legend and became a way for common understanding.
During the three-day discussion, all participants in the meeting supported the new version of the unified legend for the International Tectonic Map of Asia ITMA5000.
A desire was expressed to finalize the new legend by the beginning of the 36th Session of the International Geological Congress in New Delhi (India) on 2-7 March 2020, so that it would be presented at the General Assembly of the Commission for the Geological Map of the World. It is assumed that by the beginning of the Congress the authors for the International Tectonic Map of Asia will be specified. It is believed that in the new legend, the “regional” tectonic events that occurred, for example, only in Southeast and South Asia will be finally correlated with stages and phases of tectogenesis widely developed in the vast area of Eurasia from the Arctic to North Africa, Southern Europe, and the Middle East.
Discussion on the content of the Tectonic Map of Asia and its legends is held by CGMW President Dr. Manuel Pubellier
Some participants in the workshop (Dr. M. Pubellier, Prof. K. Wakita and others) touched on the issue of a more detailed reflection of the “Tertiary” tectonics in the map of Asia, as this is due to the formation of a new crust along the Pacific margin of Asia, and, on the other hand, crust transformation along the main collision zone of the Alpine-Himalayan belt. This idea was supported by Academician A.I. Khanchuk.
Commentary on the theoretical basis of the principles of mapping and building a legend for it is made by the President of the CGMW Subcommission for Tectonic Maps, Academician A.I. Khanchuk
At this, the Second Workshop “International Tectonic Map of Asia (ITMA5000)” and the scientific conference “Asian Tectonics” completed their work. Unfortunately, representatives of the CGMW Subcommission for the Middle East from Iran were unable to come to Beijing and take part in the workshop. The time and venue of the Third Workshop on ITMA5000 will be determined at the meeting of the Bureau and General Assembly of the Commission for the Geological Map of the World in New Delhi in March 2020 during the 36th Session of the International Geological Congress.