广东省英德县宝晶宫洞穴堆积的形成时间及自然环境探讨

RESEARCH ON THE FORMING TIME OF SEDIMENTS IN CAVE OF THE PRECIOUS CRYSTAL PALACE AND ITS NATURAL ENVIRONMENT IN YINGDE COUNTY, GUANGDONG PROVINCE

英德宝晶宫由发育完整的3层溶洞组成。根据微古植物群推测,宝晶宫溶洞沉积物形成时间可能在全新世。其时环境为湖泊所淹,而附近丘陵山地上却发育着以松柏类为主的亚热带针叶林植被,气候温暖潮湿。

Yingde Precious Crystal Palace is a well-developed cave composed of three stages. Abundant palynomorph and diatom fossils are found in trial boring Z_(21) that is settled in the second hall on the lowest cave, in which pollens are rich in Pinus and then are frequent with Salix, Podocarpus and Magnolia, spores are frequent with Polypodiaceae, Athyrium, Microlopia and Osmunde, and diatoms are rich in Cymbella, Navicula, Cocconies and Melosira etc. According to this micro-palaeo-flora, we conclude that the sediments of the cave were probably formed at Holocene, when the cave was submerged by lakes and the nearby hills were covered by subtropical conifers dominantly the Pine-Cypress grown under temperate and humid climates.