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International Geological Map of Asia at 1:5 M (IGMA)

1st edition, 2013
Scale: 1:5 000 000
Projection: Lambert Azimuthal Equal Area, projection center Central Meridian E90°, Lat. of origin N40°
Dimensions : 12 sheets, each 100 x 69 cm
Chief Compiler: REN Jishun. Associate Chief Compilers: NIU Baogui, WANG Jun, JIN Xiaochi, XIE Liangzhen
Leaders of Working groups: I. Oleg PETROV, II. Abdolazim HAGHIPOUR, III. NIU Baogui, IV. Ajit KUMAR, K. WAKITA

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The IGMA 5000 is the first-of-its-kind digitally-created international geological map of Asia depicting the geology of both the continent and offshore areas. The map spans the entirety of Asia and its peripherical regions from the Alps in the west to the Mariana Trench in the east, and from the Arctic Ocean in the north to the Java Trench in the south. It is an essential document for users to explore the geology of Asia from a global perspective and a helpful tool to understand the tectonic relationship between the Asian continent and its neighbouring continents and oceans.

Major advances achieved during the compilation of the map are summarized hereafter.

1) Large amounts of Mesozoic volcanic rocks occurring in the eastern Asian coastal area are mainly Cretaceous instead of Upper Jurassic–Lower Cretaceous. Most of the Carboniferous–Permian volcanic rocks in Central Asia seem not to be related to arc volcanism, but the product of extensional dynamics. The basal boundary of the Meso-Neoproterozoic Jixian section in China is not dated at 1.8 Ga as previously stated, but younger than 1.68 Ga.

2) The most significant Neoarchean tectono-thermal events in the Sino-Korean and Indian cratons took place at 2.5 Ga rather than at 2.7 Ga. The basement of the Yangtze craton was finally formed at 0.75–0.8 Ga, that is to say 0.2–0.3 Ga later than the Grenville orogenic cycle. Geologically, South China is identified to be an Early Paleozoic Caledonian foldbelt. The Qinling belt, where no oceanic basin was developed in Triassic times, is not an Indosinian collisional orogen, but is due to continental crust subduction. When Pangea was formed, Indo-Australian Gondwana was joined to Paleo-Asia and consequently with no intervening oceanic basin (no Paleo-Tethys from Paleozoic to Mesozoic). A huge Indosinian orogenic belt existed in the southern margin of Paleo-Asia to the north of the present Zagros–Himalayas megabelt.

3) Asia is a composite continent consisting of three major cratons —the Siberian, Indian and Arabian— and three huge orogenic belts including a number of minor cratons and microcontinents. The main body of the Asian continent took its shape during the Mesozoic. The orogenic belts belong respectively to three global tectonic domains: the Paleo-Asian, Tethyan and Pacific. The small cratons, such as Sino-Korea, Yangtze, Tarim, and Sibumasu, are assumed to be related to the tectonic transform zone between Gondwana and Siberia. Initially situated in the northern margin of Gondwana before the disappearance of the Paleo-Asian Ocean, these cratons, after the closing of the Paleo-Asian Ocean and then the opening of the Tethys, were located in the southern margin of Paleo-Asia. The fact that ophiolites in Asia appear to get progressively younger from north to south sheds some light on the Phanerozoic evolutionary process of the dispersion of Gondwana and the accretion of Asia accompanied by a southward migration of its orogenic belts.

The realization of a 1:5M International Geological Map of Asia (IGMA) was proposed by Academician Ren Jishun, from the Academy of Geological Sciences of China in Beijing, during the CGMW General Assembly held in Paris 2002. This proposal was validated by the CGMW Bureau and adopted by the General Assembly held at the IGC 32 in Florence, August 2004. The work on the map started off in 2005.

The compilation of the 1:5 M scale International Geological Map of Asia (IGMA5000) under the aegis of CGMW and with the support of UNESCO, was carried out by the CGMW Subcommission for South and East Asia in conjunction with the Subcommissions for the Middle East, Northern Eurasia and Seafloor Maps, and the geological institutions of the participating countries (Cambodia, China, D.P.R. Korea, France, India, Indonesia , Iran, Iraq, Japan, Kazakhstan, Laos, Malaysia, Myanmar, Mongolia, Pakistan, the Philippines, R. Korea, Russia, Thailand and Vietnam). Substantial support to this project was given by the China Geological Survey, Sinopec Exploration and China National Petroleum Corporation.

In order to achieve this extensive synthesis, six workshops were organized in China by the Chinese Academy of Geological Sciences between 2005 and 2012, and six working groups were set up:

1) The Northern Eurasia Working Group with the CGMW Subcommission for Northern Eurasia and All-Russia Geological Research Institute (VSEGEI) in charge of compiling the geological map of Russia, Central Asia and adjacent offshore areas in conjunction with related countries;
2) The China, Mongolia and Korea peninsula Working Group with the CGMW Subcommission for South and East Asia, The China Geological Survey, the Institute of Geosciences and Mineral Resources of Korea (KIGAM) and the Institute of Geology and Mineral Resources, Mongolian Academy of Sciences were in charge of compiling relevant part of the IGMA5000;
3) The Middle East Working Group with the CGMW Subcommission for the Middle East was in charge of compiling the geological map of the Middle East and Near East area, adjacent part of Africa, and adjacent offshore areas;
4) The Japan and Southeast Asia Working Group with the CGMW Subcommission for South and East Asia, the Geological Survey of Japan has been in charge of compiling the geological map of Japan, Southeast Asia and adjacent offshore areas in conjunction with related countries;
5) The South Asia Working Group with the CGMW Subcommission for South and East Asia, the Geological Survey of India was in charge of compiling the geological map of South Asia and adjacent offshore areas, and
6) the Editorial Working Group whose task was to synthesize all the available data from aforesaid working groups.

  • Lenght 300 cm
  • Width 276 cm
  • Weight 1.750 Kg
  • Scale 1:5 000 000