Flowage process and behavior of magmatic water of long lava flows from fuji volcano.

富士火山的两个长熔岩流，Saruhashi和Mishima熔岩，从它们的出现开始，被研究了它们的流动过程。Saruhashi熔岩流经一个狭窄的V形山谷，大部分由一个Pahoehoe流动单元组成。但在两个支流与熔岩向下流经的山谷汇合的地方，人们发现熔岩由几个流动单元组成，其中一些小规模的泡状小叶被水冷却。这些产状被认为是由支流河水的猝灭作用形成的，而另一部分则被膨胀成厚的单一流动单元，没有保留膨胀前形成的小泡状叶的原始形状。另一方面，三岛熔岩由三个以上的流动单元组成，每个流动单元都是厚度不到2米的薄片状流动。在山顶附近，发育了一个管状系统，岩浆似乎得到了迅速的供应，但在下游，岩浆不能充分膨胀，岩浆从前兆席片叶中流出，以薄片的形式扩散。与Saruhashi熔岩流经狭窄的V形山谷相反，Mishima熔岩流经宽阔平坦的平原，因此它是水平传播的，不能垂直膨胀。为了比较土壤中的水分含量，对这些土壤进行了Karl-Fisher滴定分析。在本项目中，获得了玄武岩样品分析的条件：1)粉碎样品在150℃加热24小时以上，并测量重量。然后，吸收的水被移走。2)随后，将样品加热到1000℃，并对玻璃中溶解的水进行分析。岩石样品的粉碎细度最好超过100微米。

Two of the long lava flows from Fuji volcano, Saruhashi and Mishima laves were investigated for their flowage process from their occurrences. Saruhashi lava flowed down through a narrow V-shape valley and is composed of one pahoehoe flow unit in most part. But in two localities where the tributaries join the valley through which the lava flowed down, it is found that the lava consists of several flow units, with small-scale pahoehoe lobes some of them being chilled by water. These occurrences are interpreted to be-formed by quenching effect by the river water from the tributaries, whereas, the other portion was inflated to be thick single flow unit and did not reserve the original shape of small-scale pahoehoe lobes which was formed before inflation. On the other hand, Mishima lava consists of more than three flow units each of which is thin sheet flow less than 2 meter thick. Near the summit, a tube system was developed and magma seems to have been supplied quickly but in the downstream side, magma could not inflate enough and magma drained out from the precursory sheet lobe and spread as thin sheets. In contrast to that the Saruhashi lava flowed down through the narrow V-shaped valley, the Mishima lava flowed down in a wide flat plain, therefore, it spread horizontally and could not inflate vertically. In order to compare the water contents in the laves, the _analyses by Karl-Fisher titlation method was planned for these laves. In this project, the conditions for the analyses of basaltic rock samples were obtained as follows : 1)crushed sample is heated by 150℃ for more than 24 hours, and the weight is measured. Then the absorbed water is removed. 2)Subsequently, the sample is heated by 1000℃ and the water dissolved in the glass is analyzed. It is desirable that the rock sample is crushed finer than 100 micron.