NUMERICAL MODELING OF STRUCTURES OF HUAGANG PERIOD IN THE MIDDLE-NORTHERN XIHU SAG AND ITS IMPLICATIONS FOR PROVENANCE
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摘要:
在区域研究的基础之上，根据平衡剖面恢复的运动学参数，利用构造应力数值模拟技术，对渐新世花港期西湖凹陷中北段和东部的构造变形与物源进行了研究。结果表明：西湖凹陷东西向挤压在中新世玉泉期最为强烈，其次为花港期；花港期，由南向北水平缩短率逐渐变大。福江凹陷在花港期存在巨大基底裸露区，为西湖凹陷渐新统花港组的沉积提供了充足的物源。钓鱼岛隆褶带之上广泛发育花港组，厚度从南向北逐渐减薄，地质趋势法恢复的北部剥蚀厚度达1 700 m。花港期冲绳海槽还未形成，钓鱼岛隆褶带与东海陆架外缘隆起连在一起，接受来自东侧的物源供给。数值模拟结果为西湖凹陷北侧、东侧物源的存在提供了构造变形的理论基础，阐明了西湖凹陷花港组内发育以轴向水系为主，多向物源供给的构造背景。
Abstract:Based on regional geological research, by means of the kinematics parameters extracted from balanced sections and tectonic stress simulation, tectonic deformation and depositional provenances of the Huagang Period in the middle-north and east parts of the Xihu Sag are studied in this paper. The results demonstrate that the EW compression was the strongest in the Yuquan period of Miocene in the Xihu Sag, followed by the Huagang period of Oligocene. The horizontal shortening rate gradually increased from south to north during the Huagang period. There was a huge exposed basement area in the Fujiang Sag, which provided enormous sediments to the Xihu Sag. The Huagang Formation is widely distributed in the Diaoyu Islands folded-uplift belt. Its thickness gradually decreased from south to north, and the denudation thickness, recovered by the geological trend method, reached 1 700 m in the north. Up to the Huagang period, the Okinawa Trough has not yet formed.The Diaoyu Island uplift belt was thus directly next to the outer uplift of the East China Sea Shelf and received sediment supplies from the east. The numerical simulation results provided a tectonic basis for recognizing the provenances on the north and east sides of Xihu Sag. Axial drainage systems of multiple provenances dominated the Xihu Sag during the period of Huagang Formation.
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Key words:
- tectonic stress /
- provenance analysis /
- numerical modeling /
- Huagang period /
- Xihu Sag
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