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OALib Journal期刊
ISSN: 2333-9721
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西湖凹陷古近系花港组物源区特征分析
Keywords: 物源分析,稀土元素配分模式,重矿物组合,花港组,西湖凹陷
Abstract:
？西湖凹陷花港组是研究区重要的储层之一，其物源一直是争论的焦点。应用砂岩碎屑组分特征，重矿物分析并结合砂地比等值线图精细描绘物源分支，从不同角度、不同层次对西湖凹陷花港组物源体系进行了精细研究。结果表明,西湖凹陷花港组物源主要来自凹陷的西部边缘，东部钓鱼岛隆褶带影响较小，具体分为3大分支:西部的海礁隆起为近物源、西北部虎皮礁凸起和东部钓鱼岛隆褶带物源的结合影响凹陷北部地区、西南部的渔山隆起为凹陷的中南部地区提供物源。通过对岩屑类型、长石特征、石英颗粒和重矿物的微观特征和稀土元素等特征的分析，推测出凹陷周边岩体性质，花港组的母岩主要是岩浆岩，其次为变质岩，沉积岩少见。变质岩主要发育在海礁隆起的中部，影响西部的平湖地区，沉积岩仅在钓鱼岛隆褶带北部地区少量发育。
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