珠江口盆地白云深水区珠海组石英颗粒表面特征

发布时间：2018-06-03 21:53

本文选题：白云深水区 + 珠海组　；参考：《西南石油大学学报(自然科学版)》2017年01期

【摘要】：石英具有较大的硬度和较高的化学稳定性,较好地保留了搬运和沉积过程中各种地质营力所形成的微观形貌特征,这些微观形貌可为沉积物搬运机制、沉积环境解释提供依据。通过对珠江口盆地白云凹陷深水区珠海组单颗粒石英的表面形貌特征的研究发现,该组的沉积石英颗粒表面微观形貌类型可划分为机械、化学、机械化学成因等3大类和26小类。其中以次棱角状、V形撞击坑、直弯沟/刻痕、机械上翻片、磨蚀疲劳等碰撞磨蚀压刻等机械成因的微观形貌特征最为突出,表明研究区珠海晚期的沉积作用以中等的搬运距离、高能的水动力条件(上部流动体制)和跃移为主的搬运机制为特征。该研究填补了中国深水区此项研究的空白,虽然这些微观形貌的具体沉积环境意义还有待深入研究,但这将为沉积过程的研究提供新的思路和证据。
[Abstract]:Quartz has higher hardness and higher chemical stability, and it retains the microscopic morphology characteristics formed by various geological forces in the process of transport and deposition, which can provide the basis for the sediment transport mechanism and the interpretation of sedimentary environment. Based on the study of the surface morphology of single grain quartz of Zhuhai formation in Baiyun sag of Pearl River mouth basin, it is found that the microscopic morphology of the sedimentary quartz surface can be divided into mechanical and chemical types. There are 3 kinds and 26 small categories of mechanochemical origin. Among them, the micro-morphology of the impact crater, straight bend groove / notch, mechanical upturned plate, abrasion fatigue and so on is the most prominent, indicating that the sedimentation in the late period of Zhuhai, in the study area, was carried out at a medium distance. High energy hydrodynamic conditions (upper flow regime) and leapfrogging transport mechanism are characteristic. This study fills up the blank of this research in deep water area of China. Although the specific sedimentary environment significance of these microscopic morphologies needs to be further studied, it will provide new ideas and evidences for the study of deposition process.
【作者单位】：中国地质大学(北京)能源学院;中国地质大学(北京)海洋学院;中海石油(中国)有限公司深圳分公司研究院;
【基金】：国家自然科学基金重点项目(91328201)
【分类号】：P618.13;P578.494

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