磨拉石建造(molasse formation)是沉积建造的一种类型。同造山作用形成的分选性差、磨圆度低的快速粗大碎屑沉积,形成于近海(部分为海相,部分为陆相或三角洲相)的和陆相环境中。其特征是厚度巨大,无递变层理,具有交错层,由砾岩、砂岩、页岩和泥灰岩等构成,有时还含有煤层和碳酸盐类沉积物。
叶城盆地属于塔里木盆地的西南坳陷,在晚新生代沉积了巨厚的磨拉石建造。
The Yecheng foreland basin is a part of the southwest sag of the Tarim Basin and contains late Cenozoic molassic deposits with great thickness.
在盆地西南缘发育燕山中期的晚侏罗世和早白垩世的粗碎屑类磨拉石建造及其地层间的角度不整合。
On the southwestern margin of the basin there occur middle Yanshanian Late Triassic and Early Cretaceous coarse clastic molasse-like deposits and angular unconformity.
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