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近几年,在苏南张家港市塘桥—妙桥地区进行勘探,发现长兴组石灰岩(简称长兴灰岩)厚度变化极大、岩性差异悬殊,在小范围内变化如此之大,实属罕见(图1、2)。勘探区由塘桥背斜及其两侧的鹿苑向斜、妙桥向斜构成主要构造格架,走向北东50—60°。长兴灰岩分布于背斜两翼及向斜核部,背斜轴部已被剥蚀。上覆地层为青龙群,下伏地层为龙
In recent years, exploration has been carried out in the area of Tangqiao-Miaqiao, Zhangjiagang, southern Jiangsu Province. It is found that the Changxing limestone (Changxing limestone) varies greatly in thickness and varies widely in a small area. It is rare (Figure 1, 2). The exploration area consists of the Tangqiao anticline and the Luyuan syncline and the Miaoqiao syncline on both sides, forming the main tectonic framework and heading north east 50-60 °. Changxing limestone is distributed in the anticlinal wings and syncline cores, and the anticlinal axes have been denuded. The overlying stratum is a dragon group, and the underlying stratum is a dragon