信丰大桥煤田推覆构造特征及其对煤系(层)的控制

CHARACTERISTICS OF A NAPPE STRUCTURE AND ITS CONTROLLING EFFECT ON COAL MEASURES(SEAM) IN THE DAQIAO COAL FIELD, XINFENG

大桥煤田含煤岩系为上二叠统“乐平煤系”。煤田受东西向与北北东向（“双向”）推覆构造控制，尤其是受东西向推覆构造控制十分严格。本文对该煤田各推覆构造特征及其对煤系的控制进行了系统研究，并对该区的隐伏煤系（层）进行了预测。

The coal-bearing formation of the Daqiao coal field is the Upper Permian “Leping Coal Measures'.The coal field is controlled by E-W and NNE(dualdirectional) nappe structures and especially strictly by the E-W nappe structure. The major slip plane of decollement should be located between the Upper and the Lower Permian strata because: 1.Both the limestone of the Lower Permian Maokou Formation and the sandstone of the Upper Permian Guanshan Member are often found in sheetlike form intercalated in the thrusting fault zone; and 2.Sinian, Devonian or Carboniferous strata are found overlapping the Upper Permian. Therefore a thorough understanding of the various nappe structure systems is the key to the prediction of hidden coal measures(seam).