中太平洋调查区沉积粘土矿物

CLAY MINERALS IN SEDIMENTS FROM THE CENTRAL PACIFIC INVESTIGATIVE REGION

通过用X射线衍射仪等手段的分析鉴定,确认该区的主要粘土矿物为伊利石、蒙脱石、高岭石、绿泥石。蒙脱石在钙质软泥中含量低,在红粘土中含量高,伊利石含量与蒙脱石相反。经综合分析得出两粘土矿物分区。影响粘土矿物分布的主要因素是物质来源。

Identification by X-ray diffraction has confirmed that the clay minerals in this region are illite, montmorillonite, kaolinite and chlorite. The content of montmorillonite in clay minerals is higher than of illite in some stations, which is in the areas north of 10°N .The result is consistent with that obtained by triangular figure method. The content of montmorillonite is low in calcareous ooze, high in red clay, conversely, illite is high in calcareous ooze, low in red clay. The predominating factor effecting the distribution of clay minerals is their material source. The minerals mainly originate from islands and the remote continent as well as from sea volcanoes. Sea water depth is also one of the effecting factors.