罗布泊不是游移湖——从罗布泊的演化讨论罗布泊的游移问题

The Lop Nur Is Not a Wandering Lake :Views from the Evolution of Lop Nur

从构造、沉积学的观点出发,讨论了罗布泊的发展演化,明确提出罗布泊不是游移湖.罗布泊从中更新世以来,从淡水湖演化到盐湖直至1972年干涸,其沉积中心基本是固定的.在新构造运动、气候和水源补给等的共同影响下,尽管其水域大小有一定程度的变化,其沉积中心也有过一定距离的迁移,但从总体来说并没有变化,因此,它不是“游移”湖.

Since Sven Hedin,a Swede,proposed the view that the'Lop Nur'is a wandering lake,this view has aroused a dispute in the academic communities both in China and abroad.Some agree,while others oppose it,and up to now no consensus have been reached.Re-cently,through a study of the formation,development and evolution of the ancient Lop Nur(Nur=lake),combined with the chronological study,the author has essentially ascertained the evolutionary history of the Lop Nur since800ka B.P.Its evolutionary history indicates that during the past800ka B.P.its subsidence center and depocenter have always been located in the vicinity of the Luobei subbasin in its northeastern part though several fresh-saline changes have taken place in the Lop Nur and even there appeared desiccation;so over150m thick salt sediments with clastic beds were deposited in the Luobei subbasin.Only at-3ka B.P.,owing to the influence of the neotectonic movement,was the Luobei depression u-plifted and did the lake water retreated to the south.Afterward,during the evolution of the Lop Nur in its recorded history of more than2000years,the Lop Nur water area has un-dergone several changes because of the influences of many factors such as the climate,neotectonic movement,natural factor(deposition and erosion)and human factor;however,its depocenter has always remained within a relatively fixed scope until the lake water finally dried up.Therefore,from a sedimentological point of view,there does not exist the problem of wandering of the location of the Lop Nur,and its development and evolution completely conform with the regularity of the development and evolution of ordinary salt lakes.