摘要
本文分析了江西龙南盆地中生代火山岩系余田群划分的现状及存在的问题，提出了以岩性、岩相为划分依据。将余田群下部的砂、砾岩组合，划归水头迳组，中部的基性岩组合和上部的中酸性岩组合划归菖蒲组；将前人划入火山岩系中的变质岩组合归于震旦—寒武系。同位素年龄资料表明，余田群菖蒲组的地质时代为中侏罗世—晚侏罗世早期，水头迳组是否包含早侏罗世沉积，有待进一步研究证实。
WT10.5,10.BZ]The paper analyses the classification actuality and existing questions of the Yutian group of Mesozoic volcanic rock series in Longnan basin, Jiangxi province. According to lithology and lithofacies, the sandstone and conglomerate association of the low part of Yutian group should be classified into Shuitoujing formation, and the basic rock association of the middle part and the medium acidic rock association of the upper part of Yutian group should be classified into Changpu formation. The metamorphic rock association which is classified into volcanic rock series by former should be classified into Sinian cambrian system. The isotope data shows that geological period of Changpu formation in Yutian group is from middle Jurassic epoch to early stage of late Jurassic epoch. It needs further certification that the early Jurassic epoch sediment occurs in Shuitoujing formation or not.
出处
《华东地质学院学报》
1998年第4期301-307,共7页
Journal of East China Geological Institute
基金
核工业科学基金
关键词
火山岩
地层划分
中生代
地质时代
volcanic rock
Stratigraphic classification
Mesozoic
Longnan
Jiangxi
