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首页> 外文期刊>Journal of Asian earth sciences >Oligocene-Miocene sequence stratigraphy in the northern margin of the South China Sea: An example from Taiwan
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Oligocene-Miocene sequence stratigraphy in the northern margin of the South China Sea: An example from Taiwan

机译：南海北边缘的少茂 - 中烯序列地层：台湾的一个例子

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Oligocene-Miocene sediments in the Taiwan region were accumulated in the NE passive-continental margin of the South China Sea. We utilized around -200 boreholes and reflection seismic data to study the Oligo-Miocene sequence stratigraphic framework in the Taiwan region. Major sequence boundaries are used to map out various sediment isopach maps, enabling us to decipher dominant tectonic events during the course of passive-margin evolution.The Oligocene-Miocene succession is divided into 16 sequences on the basis of well-log correlation. These 16 sequences can be grouped into four (A, B, C, D) sequence sets. Isopach maps of sequence sets B and C (-21?12.5 Ma) show that they blanket the west Taiwan basins with relatively uniform thickness deposited during uniform and slow basement subsidence. Sequence sets A (-30?21 Ma) and D (-12.5?6.5 Ma), however, thickened into fault-bounded troughs, recording two extensional events that were especially active in the outer margin (i.e., the Tainan Basin). There is a general correlation between the Taiwan Miocene sequences and the glacioeustasy during the interval -21?6.5 Ma. Therefore, eustasy is the dominant control on the Taiwan Miocene stratigraphic development. The deposition of the sequence set A during -30?21 Ma and possibly the sequence set D in the outer margin during the late Miocene, however, appears to have been strongly modulated by extensional tectonics and local sedimentary factors (e.g., rates of basin subsidence, sediment supply and basin physiography, etc.).
机译：台湾地区的少茂 - 中茂沉积物累积在南海的NE被动大陆边缘。我们利用约-200井和反射地震数据，研究台湾地区的寡核苷酸序列地层框架。主要序列边界用于映射各种沉积物I​​Sopach地图，使我们能够在被动边缘演化过程中解读主导的构造事件。基于良好的对数相关的寡茂 - 中生继承被分成16个序列。这些16个序列可以分为四个（a，b，c，d）序列集。序列的ISopach映射集B和C（-21？12.5 mA）表明，它们在均匀和缓慢的地下室沉降期间覆盖了西台盆，沉积的厚度相对均匀。序列设定（-30°21mA）和D（-12.5·6.5 mA），变得在故障有界槽中，记录在外边缘中特别有效的两个延伸事件（即，Tainan盆地）。在间隔期间，台湾内诺序列和冰川珠铁之间存在一般相关性-21？6.5 mA。因此，南果实是台湾内国地层发展的主导控制。然而，序列的沉积在-30°21mA期间，在后部内酯期间，外部边缘中的序列设定为序列集D，似乎受到延伸构造和局部沉积因子的强烈调节（例如，盆地沉降率，沉积物供应和盆地物理图等）。

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