Shun-ichi UENO
Parapatric
Occurrence of Anophthalmic Trechiama (Coleoptera,
Trechinae) in
Central Japan
|
Parapatric
occurrence of three different lineages
of anophthalmic trechine beetles bclonging to the group of Trechiama
ohshimai is recorded on the Etsumi and the lbuki
Mountains on the borders of Fukui, Gifu and Shiga Prefectures in
Central Japan.
Three new species. T. dispar, T. iwasakii
and T. etsumianus, are described. the first belonging
to the nagahinis complex, the second to the suzukaensis comp]ex and the third to the ohshimai
complex. Besides, a new
species, T. cognatus, is described
from a mine adit because of its close affinity to T.
etsumianus. |
Kazuo
ISHIKAWA
A New Euryparasitus
(Acarina, Gamasida, Rhodacaridae) Collected from Mine Adits
of Japan
|
A new
species of the genus Euryparasitus
belonging to the gamasid family Rhodacaridae is described from Japan
under the
name of E. pagumae. It was collected
from nests of the masked palm-civet in mine adits. This genus is
recorded for
the first time from Japan. |
Naruhiko
KASHIMA
Geochemistry
of the Spelean and Insular Phosphates
from Japan : Variscite and Vashegyite
|
For the
mineralogical and geochemical characterization of variscite and
vashegyite from
caves and insular environments in Japan, four specimens were analyzed
by using XRD,
XRF, SEM with EDX and SIEMS. The major elements and trace-elements as
Nb, Zr,
Y, Sr, Rb, Pb. Zn, Cu, Ni, Co, Cr, Ba, V, S and Ga were determined.
There is a
high possibility that the data of trace-elements reflect different
types of geochemical
environments. |
Tetsuo
MINAKAWA, Sachio INABA and Naruhiko KASHIMA
Crandallite
from Funakoshi Limestone Cave, Mie
Prefecture, Japan
|
Crandallite occurs as
white aggregates
of trigonal or rhombohedral crystals up to 15É m in size with vitreous
luster,
or rosettes of thin lamellae, in wall crust of clay associated with
hydroxyapatite
in Funakoshi limestone cave, Mie Prefecture. This is the first finding
of the
mineral in a limestone cave of Japan.
XRD
powder data identify Funakoshi
crandallite as hexagonal type. Micro-prove analysis (semiquantitative
determination) gives trigonal crystal (P2O5 29.85, Al2O3 34.97, CaO
9.98, SrO
0.06wt%, SO3 trace) and rhombohedral crystal (P2O5 29.67, Al2O3 33.61,
CaO
9.70, SrO 0.01 wt%, SO3 trace), Ieading to the experimental formula (O=
l0.5) (Ca0.83,
Sr0.01)É0.84Al3.14P1.95O10.5 (trigonal), (Ca0.83,
Sr0.00)É0.83Al3.14P1.95O10.5
(rhombohedral). Thus, Funakoshi crandallite seems to be nearly pure
endmember-CaAl3(PO4)2(OH)5ÅEH2O. |
Hayao
MORINAGA, Haruko MURAYAMA, Ikuko HORIE, Yu Yan
LIu, Katsumi YASKAWA and Tadashi KURAMOTO
Age
Detemination of Collapse in Limestone Caves by
Comparison of Paleomagnetic Records in Stalagmite with a Paleomagnetic
Secular
Variation Curve -An Example of Yurino-no-ana Cave-
|
In
several limestone caves, there are many
collapsed base rocks and speleothems. An age of collapse was determined
through
a paleomagnetic analysis of a collapsed flowstone and a stalagmite
growing up
on the flowstone, which were collected from Yurino-no-ana Cave,
Akiyoshi,
Japan. The stalagmite seems to have recorded the geomagnetic field
variation
after collapse, because the stalagmite and the flowstone respectively
have
quite different paleomagnetic records. Based on comparison of the
paleomagnetic
records of the stalagmite with a paleomagnetic secular variation curve
obtained
from a Yogo Lake sediment core, the age of the lowest part for the
stalagmite
was estimated at about 4,500 years BP. It was concluded that the
collapse had
happened till 4,500 years BP. The collapse may have occurred due to a
catastrophic event (e.g., an earthquake activity). |
Luis
S. QUINDOS, Pedro L. FERNANDEZ, Jesus SOTO, Eugenio
VILLAR and Toshikatsu MIKI
Evolution
of the Radon Concentration in Altamira
Cave
|
Concentration
of atmospheric radon was measured in Altamira
Cave, Spain, having been closed to public since 1977 for preservation
of
ancient paintings. The radon activity strongly depends on the
ventilation flow
rate in the cave, and agrees with theoretical one calculated with a
two-cylinder model for radon behavior in caves. The correction factor
of the
radon exhalation rate, which was introduced to compensate for the
roughness of
cave walls, is important at low ventilation rates, but becomes
insignificant at
higher flow rates than 0.1 m/s. |