成都市天府新区成都直管区第四系地层特征
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摘要
天府新区直管区第四系地层广泛分布。通过对天府新区成都直管区的路线调查、剖面测制及样品测试分析,查明了研究区第四系物质组成、结构特征及厚度。区内第四系主要分布有:下更新统磨盘山组、下-中更新统牧马山组、中更新统合江组、上更新统广汉组、上更新统-全新统资阳组以及上更新统成都粘土。岩石粒度及地球化学分析结果表明,研究区更新世网纹红土和成都粘土均属于粉砂质粘土,更新世网纹红土经历了湿热环境下强烈的化学风化,成都粘土次之,推测更新世成都平原地区与长江中下游地区具有相似的古气候环境。研究区牧马山组及合江组的测年结果进一步确定了直管区第四纪堆积物的时代,为与成都平原第四系地层对比划分,以及第四纪地质构造演化提供了重要的年代学资料。
Route survey, profiling and sample analyzing indicate that the Pleistocene patterned red soil and Chengdu clay of the Quaternary System in the Chengdu District, Tianfu New District, Chengdu belong to silty clay. The Pleistocene patterned red soil was undergone to stronger chemical weathering than the Chengdu clay. Paleoclimate on the Chengdu Plain was similar to that in the Middle-Lower Yangtze Plain. Dating of the Mumashan and Hejiang Formations has determined time of the Quaternary System in the Chengdu District, providing geochronological data for the Quaternary stratigraphic correlation and structural evolution of the Chengdu Plain.
Route survey, profiling and sample analyzing indicate that the Pleistocene patterned red soil and Chengdu clay of the Quaternary System in the Chengdu District, Tianfu New District, Chengdu belong to silty clay. The Pleistocene patterned red soil was undergone to stronger chemical weathering than the Chengdu clay. Paleoclimate on the Chengdu Plain was similar to that in the Middle-Lower Yangtze Plain. Dating of the Mumashan and Hejiang Formations has determined time of the Quaternary System in the Chengdu District, providing geochronological data for the Quaternary stratigraphic correlation and structural evolution of the Chengdu Plain.
引文
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[3]李勇,黎兵, Steffen D,等.青藏高原东缘晚新生代成都盆地物源分析与水系演化[J].沉积学报, 2006.24(3):309-320.
[4]乔彦松,赵志中,李增悦,等.成都平原红土堆积的风成成因证据[J].第四纪研究, 2007,27(2):286-294.
[5]应立朝,梁斌,王全伟,等.川西平原区成都粘土的粒度特征及其成因意义[J].沉积与特提斯地质, 2012,32(1):72-77.
[6]梁斌,朱兵,王全伟,等.成都平原第四纪地质与环境[M].北京:科学出版社,2014.
[7]赵志中,乔彦松,王燕,等.成都平原红土堆积的磁性地层学及古环境记录[J].中国科学(D辑),2007,37(3):370-377.
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