摘要:对鄂尔多斯盆地东南缘韩城和洛南地区的晚三叠世延长组地层的6件样品进行了煤线和碳质泥岩的镜质组反射率测定,同时测定了同组地层6件砂岩样品的磷灰石裂变径迹。结果表明鄂尔多斯盆地东南缘晚三叠世延长组热演化程度较高,韩城地区Ro值在0.65%~0.78%之间。洛南地区由于受秦岭中生代陆内造山作用的影响,三叠系延长组Ro值高达2.67%~3.71%。实际测得的裂变径迹年龄,随深度增加裂变径迹年龄减小,根据裂变径迹年龄及长度恢复出每个样品所经历的热历史。研究结果表明鄂尔多斯盆地东南缘中生代晚期存在一期约100 Ma的重要构造热事件,东南缘韩城地区与洛南地区属于不同的热演化史类型,韩城地区属于埋藏增温型,而洛南地区属于受构造岩浆活动控制类型。这一认识与野外地质证据一致。
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