著者

Takaaki KAWASUMI

出版者

The Association of Japanese Geographers

雑誌

地理学評論 (ISSN:13479555)

巻号頁・発行日

vol.80, no.12, pp.716-731, 2007-10-01 (Released:2010-03-12)

参考文献数

32

被引用文献数

3 2 2

---

Glacial fluctuations controlled by volcanic events on the Tateyama Volcano (about 2, 670m a. s. l.) in the Hida Range, central Japan, during the last glacial period were reconstructed on the basis of glacial sediments, landforms, volcanic ejecta and their stratigraphic relationships. On Mt. Tateyama (3, 015m a. s. l.) comprising granitic bedrock, glaciers became less extensive depending on the climate change from Murodo Stades I (just before 70ka) and II (just after 70ka) through Tateyama Stades I (just before 29 cal ka), II (18-20ka) and III (10-11ka). In contrast, glaciers on the Tateyama Volcano adjacent to Mt. Tateyama became more expansive from Murodo Stades I and II through Tateyama Stade I, because the successive emergence of lava peaks progressively widened the accumulation area. In addition, a glacier rich in basal water may have surged from a lava peak in Murodo Stade II, due to high geothermal flow. However, it has not been confirmed whether or not the glacier snout descended most in Tateyama Stade I. In Tateyama Stade I, the repeated collapse of caldera walls decreased the accumulation area on the lava peaks, which resulted in intermittent glacial retreat on the volcano. In Tateyama Stades II and III, the glaciers on the volcano advanced to lesser extent depending on the climate change, because the Tateyama Volcano maintained its height and size.

著者

Takaaki KAWASUMI

出版者

The Association of Japanese Geographers

雑誌

地理学評論 (ISSN:13479555)

巻号頁・発行日

vol.76, no.12, pp.854-868, 2003-10-01 (Released:2008-12-25)

参考文献数

29

被引用文献数

3 3

---

This paper reconstructs the flow directions and extent of glaciers on the western slopes of Mt. Tateyama (3, 015m asl) in central Japan from distribution, materials, and facies of two glacial sediments and related deposits. The timing of the larger glacial expansion during the Last Glacial period is then discussed on the basis of their stratigraphic relationships with dated tephras such as K-Tz (95 to 90 ka), Tt-E (ca. 70 ka), and DKP (52 to 50 ka), The wider glacial extension occurred and deposited the Jodosawa Gravel during Murodo Stade I (95 to 70 ka) in MIS 5b to 4 (marine oxygen isotope stage 5b to 4). In this substade, the glaciers extended from the non-volcanic Tateyama Main Ridge onto the flat surface of the pyroclastic flow deposits erupted from the Tateyama Volcano, and overflowed to the north from the basin. The glaciers eroded the pyroclastic flow deposits during Murodo Stade I, and extended to at least 2, 300m asl. Between Murodo Stades I and II, the glaciers were forcefully melted by the pumice fall erupted from the Tateyama Volcano, and temporarily retreated upstream. During Murodo Stade II (70 to 50 ka) in MIS 4 to early MIS 3, the snout of glaciers readvanced to about 2, 350m asl, and deposited the Murodo Gravel. The glacial readvance was restored in size soon after the pumice fall had finished.