辽宁本溪晶花洞洞穴特征及形成时代  

Characteristics and age of Jinghua Caves in Benxi of Liaoning

作　　者：秦亚[1] 程新民[1] 常建平[1] 平智岚[1] 

机构地区：[1]吉林大学地球科学学院,长春130061

出　　处：《世界地质》2011年第3期375-380,共6页World Geology

摘　　要：辽宁本溪晶花洞发育于中奥陶世马家沟组(O_2m)厚层灰岩中,主要受近SN、NE断裂控制,沿近SN断裂发育高度不同的4层洞穴。洞内沉积物以化学沉积为主,机械沉积较少。通过测定洞内外的温度、湿度及CO_2含量,对比研究发现洞穴封闭性较好,与外界大气循环较差。在与洞外干河河流阶地的高程及形成时代上的对比研究基础上,结合主洞所采年龄样的铀系法测年(111.5±5.3ka),初步推断晶花洞主洞发育于晚更新世。The Jinghua Caves are exposed in thick limestone of Middle Ordovician Majiagou Formation in Benxi of Liaoning, which controlled mainly by near SN and NE faults, and compose of four-layer caves with different levels along near SN fault. The sediments in the caves are dominated by chemical deposition with scarce mechanical deposition. By measuring the temperature, humidity and CO2 contents inside and outside the caves, the analysis shows that the closeness of the caves is good and the air circulation with the outside is poor. Based on the comparative study of elevation and formation age with the terrace of Ganhe, the authors estimate that the main cave of Jinghua Caves originated in Late Pleistocene combined with the U-dating of the samples （111.5 ± 5.3 ka）.

关 键 词：晶花洞 洞穴特征 化学沉积 形成时代 本溪 辽宁 

分 类 号：P534.63[天文地球—第四纪地质学] P512[天文地球—古生物学与地层学]