【摘要】 大亚湾悬浮物和底质主要矿物有伊利石、高岭石、绿泥石、石膏、石英、钾长石、斜长石和方解石,未见蒙脱石。粘土矿物分布沿岸较高、湾口较低,与径流和风的作用有关。石英分布与粘土矿物相反。钾长石、斜长石分布湾口较高,主要来源是中央列岛岩石的风化。底质方解石分布大鹏澳特高,澳头港和湾顶次高,与底栖生物密切有关。底质伊利石大鹏澳和湾顶特低,可能因在较低的pH环境下一部分伊利石向高岭石转化。各主要矿物含量基本与其主要元素含量正相关,但SiO₂与其组成的大多数矿物含量不相关,可能因SiO₂存在形式复杂所致。据计算,悬浮物中SiO₂的大约28％以有机物质形式存在,底质SiO₂全部存在于无机矿物之中。更多还原

【Abstract】 The suspended matters and the sediments of DAYA Bay contain illite, kaolinite, chlorite, gypsum, quartz, potassium-feldspar, plagiolase ard cal-cite, but no montmorillonit. Distribution of clay minerals is higher inshore and lower in the opening of the Bay, relating to action of runoff and wind. Distribution of quartz are opposite to clay minerals. Distribution of K-feldspar and plagiolase is higher in the opening of the Bay, because weathering of rocks from the central islands is its major source. Distribution of calcite in the sediments is particularly high in DAPENGAO, rates second high in AOTOU harbour and the end of the Bay, which is closely related to benthos. Illite of the sediments in DAPENGAO and the end of the Bay is particularly low, a possible reason being that a part of illite changes into kaolinite under condition of lower pH value. The content of each major mineral is basically positively related to the content of major elements, but SiO2 is not related to the content of a majority of minerals containing SiO2, because the existing shape of SiO2 is probablely complex. According to calculation, about 28% of SiO2 in the suspended matters exist in organic shape, and SiO2 in the sediments exist completely in inorganic minerals.更多还原