Discussion on the chronology of Suhongtu formation in Bayingebi basin
Discussion on the chronology of Suhongtu formation in Bayingebi basin
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发表时间：
2010
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通讯作者：
Z. Lei
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作者：
Z. Lei
本文根据玄武岩K-Ar同位素年龄和盆地演化的沉积特征，探讨了巴音戈壁盆地苏洪图组的特征，发现早白垩世苏洪图组从盆地的开始到结束都有发育，但苏洪图组是异步的，西部苏红土组形成时间较早，以一套与玄武岩相互作用的沉积物为特征，K-Ar年龄为141-146 Ma，属下白垩统，东部苏红土组形成较晚，以一套收缩沉积为特征，与K-Ar年龄为108-109 Ma的玄武岩相互作用，属上白垩统，盆地火山活动自西向东发育。苏红图组的年龄跨度达30 Ma，远大于一个正常地层的年龄跨度，建议对苏红图组进行划分。
This paper discussed the characteristic of Suhongtu formation in Bayingebi basin based on the K-Ar isotopic age of basalt rock and the deposition character of the basin evolvement,it was found that Suhongtu formation had been developed from the beginning to the end of the basin in the early Cretaceous,but Suhongtu formation was asynchronous,Suhongtu formation in the west part was formed earlier which is characterized by a set of sediments with the interacted basalt of the 141-146 Ma K-Ar age and belong to lower Cretaceous,while Suhongtu formation in the east part was formed later which is characterized by a set of shrinking sediments with the interacted basalt of the 108-109 Ma K-Ar age and belongs to upper Cretaceous.Volcanic action in the basin was developed from west to east. The age span of Suhongtu formation reaches 30 Ma which is much longer than that of a normal formation.So it is suggested that Suhongtu formation should be divided.