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The contribution and impact of shallow water platform as a potential source area on siliceous submarine fans
Basin Research ( IF 2.8 ) Pub Date : 2024-08-10 , DOI: 10.1111/bre.12891 Xiaobo Zheng 1, 2 , Hongtao Zhu 1, 2 , Qianghu Liu 1, 2 , Zhiwei Zeng 3 , Zhongheng Sun 4 , Caiwei Fan 5
Basin Research ( IF 2.8 ) Pub Date : 2024-08-10 , DOI: 10.1111/bre.12891 Xiaobo Zheng 1, 2 , Hongtao Zhu 1, 2 , Qianghu Liu 1, 2 , Zhiwei Zeng 3 , Zhongheng Sun 4 , Caiwei Fan 5
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The shelf‐margin deltas are the primary ‘sources’ of interest in siliceous submarine fan source‐to‐sink systems. However, less has yet to be discovered about the roles and effects of the shallow water platform situated on continental slopes. Using the Miocene sediments of the Ledong‐Lingshui Sag in the western part of the Qiongdongnan Basin (QDNB), this paper studies the YC35 coarse‐grained submarine fan that developed in the Meishan Formation (Fm.). The material sources, depositional characteristics, and developmental mechanisms of this fan were investigated. The restored palaeogeomorphology, based on high‐resolution 3D seismic data, shows that a shallow water platform exists. According to geochemical palaeoenvironmental data, the shallow water platform was ideal for forming carbonate deposits in the Meishan Fm., owing to the warm and humid palaeoclimate and the shifting trend in palaeowater depth. Based on the combined source tracing of heavy minerals, coherence slices, and seismic profiles, the shallow water platform and the Ningyuan River source on Hainan Island contributed to the YC35 coarse‐grained submarine fan. Compared to submarine fans formed during different periods, coarse‐grained fan stands out due to its distinct sedimentary structure, rock composition, and microlithological characteristics. Aside from not following the usual Bowmar sequence, there is an excess of gravel and no clear bedding or lamination. A large number of rock fragments, mostly granite and sedimentary rock (carbonatite), make up the rock composition. According to these results, the shallow water platform significantly affects submarine fan material composition. In addition, the attribute slice based on the root mean square reveals that shallow water platforms moderate peripheral deposition. We attribute the development and proximal supply of the shallow water platform to diapirism and forced regression. Our research provides novel insights and comprehension into the investigation of submarine fan sedimentary systems.
中文翻译：
浅水平台作为潜在源区对硅质海底扇的贡献及影响
陆架边缘三角洲是硅质海底扇源汇系统的主要“来源”。然而，关于位于大陆坡上的浅水平台的作用和影响，目前还知之甚少。本文利用琼东南盆地西部乐东—陵水凹陷中新世沉积物，对梅山组发育的YC35粗粒海底扇进行了研究。对该扇的物质来源、沉积特征及发育机制进行了研究。基于高分辨率 3D 地震数据恢复的古地貌表明存在浅水平台。根据地球化学古环境资料，梅山组古气候温暖湿润，古水深有变化趋势，浅水台地是形成碳酸盐岩沉积的理想区域。基于重矿物、相干切片和地震剖面的联合溯源，海南岛浅水台地和宁远河源区共同形成了YC35粗粒海底扇。与不同时期形成的海底扇相比，粗粒扇因其独特的沉积结构、岩石成分和微岩性特征而脱颖而出。除了不遵循通常的鲍马尔序列外，还有过多的砾石，并且没有明显的层理或层理。大量的岩石碎片，主要是花岗岩和沉积岩（碳酸岩），构成了岩石成分。根据这些结果，浅水平台显着影响潜艇风扇材料成分。 此外，基于均方根的属性切片表明浅水平台调节了外围沉积。我们将浅水平台的发育和近源供给归因于底辟作用和强迫回归。我们的研究为海底扇沉积系统的研究提供了新的见解和理解。
更新日期：2024-08-10
中文翻译：
浅水平台作为潜在源区对硅质海底扇的贡献及影响
陆架边缘三角洲是硅质海底扇源汇系统的主要“来源”。然而，关于位于大陆坡上的浅水平台的作用和影响，目前还知之甚少。本文利用琼东南盆地西部乐东—陵水凹陷中新世沉积物，对梅山组发育的YC35粗粒海底扇进行了研究。对该扇的物质来源、沉积特征及发育机制进行了研究。基于高分辨率 3D 地震数据恢复的古地貌表明存在浅水平台。根据地球化学古环境资料，梅山组古气候温暖湿润，古水深有变化趋势，浅水台地是形成碳酸盐岩沉积的理想区域。基于重矿物、相干切片和地震剖面的联合溯源，海南岛浅水台地和宁远河源区共同形成了YC35粗粒海底扇。与不同时期形成的海底扇相比，粗粒扇因其独特的沉积结构、岩石成分和微岩性特征而脱颖而出。除了不遵循通常的鲍马尔序列外，还有过多的砾石，并且没有明显的层理或层理。大量的岩石碎片，主要是花岗岩和沉积岩（碳酸岩），构成了岩石成分。根据这些结果，浅水平台显着影响潜艇风扇材料成分。 此外，基于均方根的属性切片表明浅水平台调节了外围沉积。我们将浅水平台的发育和近源供给归因于底辟作用和强迫回归。我们的研究为海底扇沉积系统的研究提供了新的见解和理解。
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