|关键词: 罗布泊 游移湖 演化
|The Lop Nur Is Not a Wandering Lake: Views from the Evolution of Lop Nur
Research. Development Center of Saline Lakes and Epithermal Deposits, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, P.R.China
|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.Recently, 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 since 800 ka B.P.Its evolutionary history indicates that during the past 800 ka 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 over 150 m thick salt sediments with clastic beds were deposited in the Luobei subbasin.Only at-3 ka B.P., owing to the influence of the neotectonic movement, was the Luobei depression uplifted and did the lake water retreated to the south.Afterward, during the evolution of the Lop Nur in its recorded history of more than 2000 years, the Lop Nur water area has undergone 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.
|Key words: Lop Nur wandering lake evolution