本文關鍵詞： 古巖溶標志 桐灣運動 巖溶古地貌 燈影組 麥地坪組 川東南—黔西北　出處：《地質論評》2017年05期 　論文類型：期刊論文

【摘要】：通過對川東南—黔西北燈影組露頭、鉆井巖芯的詳細觀察分析,認為燈影組中上部發(fā)育一系列的古巖溶標志,包括巖溶角礫巖、充填的溶洞溶縫、含鐵質古風化殼等。在結合前人對上揚子桐灣運動研究的基礎上,認為川東南—黔西北大部分地區(qū)由Ⅲ幕和Ⅱ幕疊加形成了寒武系與震旦系之間的平行不整合面。采用"印模法"恢復桐灣Ⅲ幕巖溶古地貌,"印模"為下寒武統(tǒng)"牛蹄塘組+明心寺組+金頂山組";"印模"如果包括麥地坪組,"印模"底界將具明顯穿時性。根據"印模"地層分布及古地貌指示,研究區(qū)巖溶古地貌主體呈南北向展布,具有東高西低的特征,東部發(fā)育巖溶高地,西側為巖溶洼地,中部則發(fā)育巖溶斜坡。巖溶高地和巖溶斜坡可以進一步劃分為殘丘、平臺以及上斜坡、下斜坡等次級巖溶古地貌單元。
[Abstract]:Through the detailed observation and analysis of outcrop and drilling core of Dengying formation in southeastern Sichuan and northwestern Guizhou, it is considered that a series of paleokarst markers, including karst breccia and karst cavern dissolved fracture, are developed in the middle and upper part of Dengying formation. Iron bearing paleo-weathering crust and so on. Based on the previous studies on the movement of the Upper Yangtze Gulf. It is considered that the parallel unconformities between Cambrian and Sinian systems were formed in most areas of southeast Sichuan and northwest Guizhou by the superposition of acts 鈪，

本文編號：1448935