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港仔地裂缝——雷州半岛西部一条纵贯晚全新世砂堤地裂缝的发现

, PP. 712-720

Keywords: 构造地裂缝,砂堤,海岸抬升,雷州半岛

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Abstract:

港仔地裂缝发生于新生代以来强烈活动的琼雷凹陷北部雷州半岛的西海岸,沿构造带展布,形成于凸起和凹陷交界地区。地裂缝局部纵贯沿海岸展布的晚全新世砂堤,切过中更新世火山岩及其风化土和全新世海成阶地。根据其展布区的构造、地形地貌和形成特征,并与近几十年雷州半岛大量发生的地裂缝比较,认为港仔地裂缝可能属构造蠕变地裂缝。该地裂缝揭示了被纵贯砂堤的沉积学特征和形成于巨砾海滩和高能海浪下的古环境。砂堤上部约海拔5m砂堤岩取样14C测年为1360±60aB.P.,结合雷州半岛西海岸、西南海岸其他抬升特征,推测该地裂缝是在晚全新世该地海岸抬升或抬升后形成的。

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