ENVIRONMENTAL IMPLICATIONS OF MAGNETIC MEASUREMENTS ON RECENT SEDIMENTS FROM LAKE DONGHU, WUHAN

Mineral magnetic measurements have been made on three sediment cores f rom Lake Donghu, Wuhan, which reveal evidence for changes in magnetic properties of the sediments. It is suggested that the recent lake sedi ment profiles contain deposited magnetic minerals and atmospherically derived fly ash from industrial processes. In the cores, the record of 'magnetite' deposition shows that the environment of the lake has bee n affected by heavy industrial processes in intensity and range beginn ing from the 1950's onwards and remaining relatively uniform in the la st decades. In Core I the record of 'hematite' deposition parallels th at for influence of urban waste water input.