A STUDY ON THE SPORO-POLLEN ASSEMBLAGE AND ITSPALEO-ENVIRONMENT AT THE PLANT-BEARINGCALCIC SINTER OF LATE CENOZOIC ERA ON NORTHERNSLOPE OF THE KUNLUN MOUNTAINS
昆仑山北坡晚新生代含植物化石石灰华的孢粉组合及其古环境

In 1988, some plant-bearing calcic sinter were discovered and collected by the team of Scientific Expedition of Chinese Academy of Sciences to the Karakulun-Kunlun Mts. at 4600m. on the northern slope of middle Kunlun Mts. Its age is estimated to be from late Pliocene to early Pleistocene. Sporo-pollen assemblage of the plant-bearing calcic sinter is dominanted by angiospermous pollen (91.4%). Arboreal and shrubs pollen occupies 23.2% in the total pollen. Broad-leaf trees' pollen are mainly Salix, Ulmus> Quercus and Betula. Herbaceous pollen occupies 75.4%y in which Artemisia and Chenopodiaceae are abundant and Xerophyte pollens occupy a high percentages. Sporo-pollen analysis data support that the age of the plant-bearing calcic sitner is from middle-late Pliocene to early Pleistocene. In that time Paleovegetation was mainly represented by mountain steppe (Artemisia, Chenopodiaceae....) mixed with deciduous broad- Itaf forest (Salix, Quercus, Ulmus, Berula ...... in a warm and semidry climatic condition. Art annual mean temperature is estimated about 10?13?C. Altitude of the place where plant-bearing calcic sinter grew at that time was probably 1 500-2 000 m.