Abstract:

Abstract：Distribution information of Cenozoic basalts were extracted by pixel from the geological map of central and Eastern China,
and overlaid on the high-precision geomorphologic map, utilizing a digital-rimage processing program. Based on this method, we
estimated the total and sub-regional area of Cenozoic basalts exposed in Central and Eastern China. The main observations include：(1)
The total area of Cenozoic basalts in Central and Eastern China is 78 525 km2. (2) The area of Cenozoic basalts in Central China is
35 487 km2, while that in Eastern China is 43 038 km2, with a ratio of 45∶55. (3) The area of Cenozoic basalts increases along with
younger age, and the ratio of which from Paleogene, Neogene, to Quaternary is 0.36∶21.65∶77.99. (4) Cenozoic basalts of Central China
are mainly distributed in the north. Three main regions include: Great Xing'an Range, Xilin Gol region and northern edge of North
China, with an area of 7334 km2, 13 843 km2, and 14 310 km2, respectively. (5) In Eastern China, Cenozoic basalts are more widely
distributed, from Heilongjiang province in the north to Hainan Island in the south, and they can be divided into three regions: Northeast
China to the east Songliao basin (33 324 km2), Eastern China including Shandong, Zhejiang, Jiangsu and Fujian provinces (1 707 km2),
and Leiqiong region including Hainan Island and Leizhou Peninsula (8 007 km2). (6) Taken Shandong province as the boundary,
Cenozoic basalts in Central and Eastern China are mainly distributed in the north with an area of 69 191 km2, while that of the southern
part is 9334 km2, and their ratio is 88∶12.