塔里木盆地轮古东地区前石炭纪古岩溶微地貌及岩溶发育模式

以现代岩溶理论为指导,应用"印模与残厚组合法"恢复岩溶古地貌,在4种二级地貌类型(岩溶高地、岩溶陡坡地、岩溶缓坡地和岩溶盆地)划分的基础上,将塔里木盆地轮古东地区前石炭纪古岩溶地貌进一步划分为峰丛洼地、丘峰谷地、溶丘洼地、峰丛垄脊沟谷、峰丘洼地、丘丛垄脊沟谷、岩溶谷地、溶丘平原等8种三级地貌类型。并在垂向岩溶分带研究的基础上,明确了不同古岩溶地貌条件下的岩溶发育特征及充填机制。研究认为:岩溶高地为区域补给区,发育溶蚀裂缝和溶洞系统;岩溶陡坡地为补给-径流区,以高角度溶蚀裂缝为主;岩溶缓坡地为地下水径流区,发育暗河管道系统;岩溶盆地为排泄区,岩溶缝洞充填程度高。

Micro-Paleogeomorphology and Karst Development Model of the Pre-Carboniferous in Eastern Lungu Area,Tarim Basin

Guided by modern karst theory, the paleogeomorphology of the pre-Carboniferous Eastern Lungu area in Tarim Basin was restored by using the combination of impression method and residual method. Based on the identification of 2nd-grade geomorphological units including four types as karst upland, karst steep slope, karst gentle slope and karst basin, 3rd-grade geomorphological units are further divided, including eight types as peak cluster depression, QiuFeng valley, karst dome-depression, peak cluster ridge in valleys, peak hill depressions, QiuCong ridge in valleys, karst valley, karst dome-plains. Through the study of vertical paleokarst zoning, the development characteristics and filling mechanism of karst in different paleolandform units were definite. It is concluded that the karst highland is a recharge area in which developed karst crack and cave system; karst steep slope is a recharge and runoff area in which developed high angle corrosion cracks; karst gentle slope is a groundwater runoff area in which developed underground river pipeline system; karst basin is a discharge area in which developed fissure and hole system with highly filling.