世界各国的地球化学勘探专家于1972年4月中旬集中在伦敦参加在那里召开的第四届国际地球化学勘探讨论会,这个会是两年一届的,第一届会議于1966年在加拿大渥太华召开,第二届于1968年在美国的丹佛,第三届于1970年在加拿大的多伦多。在第三届会議上组织一个新的地球化学勘探专家协会,在二年时间内发展到33个国家342个会员。 Geochemical exploration experts from all over the world gathered in London in mid-April 1972 to attend the Fourth International Symposium on Geochemical Exploration there, which is held biennially. The first meeting was held in Ottawa, Canada in 1966, The second session was held in Denver, USA in 1968, and the third in Toronto, Canada in 1970. At the third session, a new Association of Geochemical Prospecting Experts was organized to develop 342 members in 33 countries in two years’ time.