鄂东南地区北西西向联合构造特征的初步探讨

来源期刊：中南大学学报(自然科学版)1979年第3期

论文作者：马德予 蔡光顺 王建荣

文章页码：92 - 100

关键词：北西西向构造； 山字型构造； 东南地区； 东西向构造； 构造体系； 构造特征； 区域性； 联合构造； 模拟实验； 构造应力场

摘    要：关于本区北西西向构造的体系归属问题,目前尚有不同的认识。我们依据:1) 在空间分布上,北西西向构造无论沿构造线的走向还是横向,与其邻侧的淮阳山字型构造西翼和区域性东西向构造的成分,均呈逐渐过渡的关系,成为一种折衷的构造形态和方位;2) 在成生的时期上,它的定型时期和强烈活动时期,与上述邻侧两个构造体系的主要成生时期(印支早期)和主要活动时期(燕山中期)是相同的;3) 在生因上,它是邻侧这两个构造体系的不同构造应力场,在同一时期发生在同一地区,而形成的联合应力场作用的产物等的上述各点,提出北西西向构造是一种联合构造。这一认识并在室内的模拟实验中基本得到验证。

Abstract: Upto now, the category of tectonic system to which belongs the NWW-trending structure in the South-east district oi Hubei province has not yet been decided. The authors propose that this NWW-trending structure may be classified as a combined structure in tectonic system according to the following evidences:1. Since the NWW-trending structure in spatial distribution whether along its trend or across its trend has gradually passed into the western wing of its neigboring Huaiyang epsilon-type structure as well as into its adjacent regional E-W tectonic system, it may be treated as a structure that possesses an intermediate form and mean orientation between the latter two structural units.2. The ages in which the NWW-trending structure takes its shape and in which it displays most intense activity correspond respectively to the main forming age (early Indo-Sinian period) and the predominent active period (middle Yanshanian period) of the two adjacent structural units mentioned above.3. As to genesis, the NWW-trending structure, is inferred to be generated in a combined stress field acted by the two adjacent structural units which occur in the same area during the period but possess different stress fields of their own.