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1 引 言 婆罗洲岛北部的沙巴毗邻裂陷的中国南部陆缘,此陆缘目前为礼乐滩和危险滩区碳酸盐台地所占据(图1)。由于在第三纪期间南中国海盆地的打开,该边缘的向南裂离作用对沙巴施加了挤压力,特别是其北部地区。通过收集毗邻地区陆上和近海的地质和地球物理资料对南中国盆地演化的认识已大大提高(Hinz等,1989)。尽管沙巴总是包括在南中国海盆地的构造重建图中,但把沙巴的地质与南中国海盆地的构造演变联系起来做的很少。因此,关于沙巴北部的地质补充资料对现有盆地演化的构造模式可提供了进一步的制约。 本文主要讨论北沙巴的地质,并试图把这地质与南中国海盆地的打开作联系。为了提出该区域构造模式这就要着重进行一定的地层、沉积和构造方面的研究。
1 Introduction Sabah, adjacent to the northern rift of southern China, bordered by Sabah in the northern part of Borneo, is currently occupied by the eolian beach and the carbonate platform in the dangerous beach area (Figure 1). Due to the opening of the South China Sea Basin during the Tertiary period, the southward rift of the margin exerted a crushing force on Sabah, especially in the northern region. Awareness of the evolution of the South China Basin has been greatly enhanced by collecting geologic and geophysical data from both onshore and offshore land in adjacent areas (Hinz et al., 1989). Although Sabah is always included in the tectonic reconstructions of the South China Sea basin, few have been done linking the geology of Sabah to the tectonic evolution in the South China Sea basin. Therefore, the geological complement to the northern part of Sabah may provide further constraints on the tectonic model of the evolution of existing basins. This paper focuses on the geology of North Sabah and attempts to link this geology with the opening of the South China Sea basin. In order to propose the tectonic model of the region, we must focus on certain stratigraphic, sedimentary and tectonic studies.