我国泥炭形成时期的探讨

从泥炭的形成时期看,我国泥炭主要形成于全新世,也有晚第三纪上新世的古泥炭、更新世早期和晚期泥炭。近万年来,不同地带泥炭的形成和发育规律有明显差异。泥炭形成时期的探讨,有助于泥炭资源的勘查和古地理研究。

A STUDY OF THE PEAT-FORMING PERIODS IN CHINA

In terms of peat-growing period there are different peat types to be found in China, such as the paleo-peat forming in the late Tertiary and other peat types forming in the Pleistocene and the Holocene. The last ten thousand years is the most active period of the formation of peat, especially in the late period of the Mid-Holocene and the early period of the late Holocene.Four peat-growing periods seem to be odvious since the Neozoic era, i.e. the paleopeat-growing period before the pleistocene and the other three peat-growing periods in the early pleistocene, late pleistocene and Holocene. There have deen differentiation in peat-forming process and growing models since the Holocene. In the stratum of the Mid-Plei-stocene, peat has not been found, which needs to study further.The peak period of peat formation in the Holocene occurred earlier in the southern China than in the northern, China. Accor ding to the carbon-dating, the peak period of peat formation occurred in 7,000-4,000 years B.P.in the tropic and subtopic zones. 5,000-1,500 years B.P.in the warm temperate zone, and 4,000-3,000 years B.P. in the frigid and middle temperate zones and Qinghai-Xizang Plateau.The peatlands which have been forming and developing are mainly distributed at the alpine region and plateaus in China, e.g. the regions of the Xinganling Mountains, the Changbai Moun tain, the eastern Qinghai-Xizang Plateau and the Yunnan-Guizhou Plateau.