国立情報学研究所 - ディジタル・シルクロード・プロジェクト
『東洋文庫所蔵』貴重書デジタルアーカイブ

138. Sand from dune against west wall of Khara-
khoto (45. C 1).
Multicoloured sand, with the larger grains well rounded.
< ·2 mm. ·2—4 mm. ·4—7 mm. >·7 mm.
Mechanical analysis: 34% 29% 36% 1%
The greater proportion of the grains are composite, but
green amphibole, muscovite, and biotite are common in the
heavy crop.

139. Sand, about three miles NE. of Khara-
khoto (45. C 1).
Subangular, multicoloured sand, with grains ranging up
to 3 mm. and with branching; tubular aggregates.
< ·2 mm. ·2—4 mm. ·4—7 mm. >·7 mm.
Mechanical analysis: 9% 6% 8% 77%
Of the heavy minerals, green amphibole and biotite are
abundant and glaucophane is noteworthy. There are many
fine-grained composite grains. The aggregates contain
quartz grains up to ·2 mm., mica up to ·6 mm., and much
very fine material cemented by calcium carbonate.

140. Sand specimen taken between tamarisk
cones, four miles S. of Arpishme (29. B 1).
Multicoloured sand, with angular to rounded grains and
many prominent red grains.
·2—4 mm. ·4—7 mm. ·7—2 mm.
Mechanical analysis: 3% 13% 84%
Magnetite is common in the heavy crop, which otherwise
contains few simple mineral grains. Among the larger grains,
subangular, turbid red orthoclase and subangular to angular
quartz and quartzite are prominent. The remainder com-
prise a few limestone and many composite grains.

141. Soil specimen of 'Kim' near S. end of Dasht-i-
Lūtak Sīstān (wind-eroded surface of alluvial
plateau) (Lūtak. 01).
Brown sand, with a few subangular pebbles ranging from
3 mm. to 28 mm. in length.
< ·2 mm. ·2—4 mm. ·4—7 mm. >·7 mm.
Mechanical analysis: 13% 45% 26% 16%
The pebbles consist of quartz and a grey chert-like rock.
The fine material contains much calcium carbonate and
some gypsum. Of the heavy minerals, altered and unaltered
biotite and green amphibole are common. There are many
composite grains of all sizes.

142. Drift-sand from top of dune above right bank
of Kan-chou R., thirteen miles below Cheng-i (43.
D 1).
A variously coloured sand consisting of well-rounded and
subangular grains up to 2 mm.
< ·2 mm. ·2—4 mm. ·4—7 mm. >·7 mm.
Mechanical analysis: 60% 30% 7% 3%
The larger grains are mainly composite, with much quartz
and some felspar.
Composite grains of high specific gravity also occur in
association with green amphibole.

143. Dune near Charchan R., Koirük-tokai (26.
A 3).
Variegated sand, with the larger grains well rounded and
the smaller grains subangular.
< ·2 mm. ·2—4 mm. ·4—7 mm. >·7 mm.
Mechanical analysis: 1% 42% 12% 45%
The larger grains are mainly quartz, with some felspar, but
many semi-opaque composite grains are also present. There
is much quartz in the smaller fraction and abundant felspar,
while of the heavy minerals, composite grains predominate,
though green amphibole, biotite, and muscovite are common.

144. Sand specimen, M. v., Mīrān site, Lop (29. B. 2).
Light brown sand, with many coloured grains, mica, and
subangular and rounded pebbles up to 12 mm.
< ·2 mm. ·2—4 mm. ·4—7 mm. >·7 mm.
Mechanical analysis: 47% 12% 10% 31%
Among the pebbles and large grains are quartz, grey
chert-like rock, mica-schist, and red granite.
The fine material contains calcium carbonate and gypsum,
and among the heavier minerals altered and unaltered biotite
is abundant as well as green amphibole.

145. Sand specimen from low dune within belt of
Yārdangs, two miles N. of dry river-bed, Girdī-chāh.
R.R. 04. 1 (desert site S. of Sīstān oasis).
·2—4 mm. ·4—7 mm. >·7 mm.
Mechanical analysis: 6% 54% 40%
There are very many composite grains, especially among
the heavier minerals. Biotite and green amphibole are
common.

146. Sand from top of mound, Ko-ta-ch'üan-tzŭ
(E. of Ying-p'an, Kansu; 42. A 1).
Fine brown sand, with gypsum crystals up to 30 mm. long.
The gypsum crystals are corroded and contain much mud.
·2—4 mm. ·4—7 mm. >·7 mm.
Mechanical analysis: 6% 14% 80%
There are many composite grains and much gypsum. Of
the heavy minerals green amphibole and altered as well as
unaltered biotite are common.

147. Sand from bed of Indus river, at mouth of
Hodar valley.
A light grey sand, with many black grains and abundant
coloured and colourless mica.
< ·2 mm. ·2—4 mm. ·4—7 mm. >·7 mm.
Mechanical analysis: 17% 47% 27% 9%
The suite of heavy minerals is very interesting. Biotite
and muscovite in subangular cleavage flakes predominate,
but angular to subangular grains of quite clear hypersthene
and augite are abundant. The hypersthene sometimes con-
tains typical inclusions. Green amphibole and magnetite
are common. Of the larger grains, some are composite,
others simple; of the simple minerals, angular cleavage
fragments of green amphibole are noteworthy.
One grain picked out by the magnet consists of serpen-
tine (?) and magnetite. It resembles decomposed olivine.