海南岛滨海断裂的构造活动历史及其动力学机制:来自磷灰石、锆石裂变径迹的证据
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1.海南省海洋地质资源与环境重点实验室;2.中国地质科学院地质研究所,自然资源部大陆动力学重点实验室;3.中国地质大学(北京)地球科学与资源学院

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Tectonic activity history and its dynamic mechanism of the Binhai fault, Hainan Island: New evidences from apatite and zircon fission track analyses
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1.Hainan Key Laboratory of Marine Geological Resources and Environment;2.Key Laboratory of continental Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences;3.School of Earth Science and Resources, China University of Geosciences

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    摘要:

    海南岛是南海唯一出露海平面的大型岛屿,周围被琼东南盆地、莺歌海盆地和北部湾盆地等新生代断陷盆地围限,构成了这些盆地边界断裂带下盘的主体。因此,海南岛的隆升剥蚀历史蕴含盆山耦合和油气、矿产资源赋存条件等重要信息。本研究首次报道了沿唯一在岛内南西向延伸的控盆断裂—滨海断裂两盘获得的磷灰石和锆石裂变径迹结果。磷灰石裂变径迹年龄范围在23±2 Ma~40±2 Ma之间,平均围限径迹长度为12.2~13.2 μm,相对较小。锆石裂变径迹年龄范围在63±3 Ma ~82±4 Ma之间,单颗粒年龄主要集中于82~78 Ma和72~69 Ma年龄组。热冷却历史模拟结果显示了三阶段的冷却历史。晚白垩世至早古新世(82~63 Ma),滨海断裂南北两盘整体快速抬升剥蚀可达3.3 km,这是受太平洋板块向北西俯冲引起NW向挤压和古南海洋中脊扩张推挤作用的联合影响,大规模挤压隆升变形导致白沙盆地西缘发育大规模的逆冲推覆构造,对白沙盆地西缘的抱伦金矿有较大的改造作用。早古新世至中中新世(63~13 Ma)阶段相对平静,其中滨海断裂北部地区,还记录了在中始新世至晚渐新世(40~24 Ma)时期的一次快速冷却事件,归因于古南海向南加速俯冲的拖曳作用,滨海断裂复活导致两侧差异隆升,这一时期沉积的粗粒物源是周缘新生代盆地的关键储层。中中新世至今(13~0 Ma),断裂南北两盘又整体快速剥蚀达1.93 km,菲律宾海板块NNW向楔入和印度-欧亚板块碰撞远程效应产生的挤压应力,使海南岛遭受强烈的快速挤压隆升剥蚀。

    Abstract:

    Hainan Island is the largest continental marginal island in the northwestern South China Sea, which is surrounded by Cenozoic rift basins such as Qiongdongnan Basin, Yinggehai Basin, and Beibu Gulf Basin. Thus, it constitutes the major footwall of the boundary fault of these basins. Therefore, the uplift and exhumation history of the Hainan Island contains important information on basin-range coupling process and oil, ores preservation conditions. This study first reports the analyses results of apatite and zircon fission track along the Binhai fault which is the only basin-controlling fault extends into the Hainan Island. The apatite fission track ages range from 23 Ma to 40 Ma, and the average confinement track length ranges in 12.2?13.2 μm, which is relatively small. The zircon fission track ages range from 63 Ma to 82 Ma, and the single grain ages are mainly concentrated in the age groups of 82?78 Ma and 72?69 Ma, respectively. The cooling history of Hainan Island since the Late Cretaceous is generally divided into three episodes. From the Late Cretaceous to the Early Paleocene (82~63 Ma), the whole Hainan Island uplifted rapidly with a total exhumation amount of 3.33 km. During this period, the Hainan Island was jointly affected by the NW compression caused by the subduction of the Pacific plate and the expansion of the middle ridge of the ancient South China Sea, and the Baolun gold mine along the western margin of the Baisha basin was also influenced by the large-scale compressional deformation. From Early Paleocene to Middle Miocene (63?13 Ma), the samples experienced a protracted period of slow cooling, except the western side of the Binhai fault, where also records a rapid cooling from the Middle Eocene to Late Oligocene (40?24 Ma). We attributed this rapid cooling period to the drag effect caused by the accelerated subduction of the Paleo-South China Sea, and the differential uplift on both sides could be attributed to the reactivation of the Binhai fault. During this period, the coarse clasts exhumed from the Hainan Island constitute the key reservoir of the Cenozoic basin. Since the Middle Miocene (13~0 Ma), the exhumation amount is 1.93 km. The compression stress caused by the NNW wedge of the Philippine Sea plate and the long-distance effect of the India-Eurasia plate collision has caused Hainan Island to undergo strong rapid compression and exhumation during this period.

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历史
  • 收稿日期:2024-06-23
  • 最后修改日期:2024-08-11
  • 录用日期:2024-09-21
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