浙西虎山公园丹霞地貌成景地层的沉积相分析FACIES ANALYSIS OF THE BEDROCK OF DANXIA LANDSCAPE IN THE HUSHAN PARK OF WESTERN ZHEJIANG PROVINCE
李鹏程,陈留勤,刘鑫,李余亮,李文灏
摘要(Abstract):
浙江省江山市虎山公园位于金衢盆地西部,下白垩统衢江群中戴组以发育红色碎屑岩,是构成景区丹霞地貌的岩石基础,目前对虎山成景地层的沉积相认识还比较薄弱。研究区的丹霞地貌以孤峰为主,属于演化晚期阶段。研究结果表明,景区红层砾石成分以紫红色凝灰岩为主(78%),大小主要为0.6~4.0cm,以次棱角状—次圆状为主(92%)。砂岩样品主要为砖红色细粒岩屑石英砂岩,碎屑颗粒大小为0.12~1.5 mm、主要为次棱角—次圆状、分选性较差,在粒度曲线上以跳跃组分为主。通过野外露头沉积构造和室内镜下显微组构研究,认为该套红层为冲积扇沉积体系的产物。这些厚度巨大的砾岩和砂岩地层被后期地壳抬升、断层切割、风化侵蚀后形成丹霞地貌。
关键词(KeyWords): 丹霞地貌;陆相红层;沉积相;早白垩世;虎山公园;江山市;浙江省
基金项目(Foundation): 国家自然科学基金项目(No.41602113);; 东华理工大学省部共建核资源与环境国家重点实验室开放基金(NRE1605)
作者(Author): 李鹏程,陈留勤,刘鑫,李余亮,李文灏
DOI: 10.19839/j.cnki.dcxzz.2018.04.011
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