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
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| 0751 |
Southern Tibet : vol.7 |
| 南チベット : vol.7 |
引用情報
OCR読み取り結果
At a time when great rivers flowed through the latitudinal valleys of Tibet,
innumerable tributaries joined them from both sides. As the main rivers, the tribu-
taries had also generally a latitudinal stretching. Even now after the enormous geo-
morphological and climatic changes which have taken place since the moist period
we meet nearly every day on a meridional crossing of Tibet a new latitudinal
valley. We have dealt with only the principal ones. Even if it would be easy to
trace many secondary latitudinal valleys, such a task would serve no useful pur-
pose. I will mention only one greater than the rest. It is situated between 33½°
and 34° North. Lat. and seems to have had its sources on the north side of BON-
VALOT's Mts. Dupleix and to have joined the river that passed by Aru-tso. Along
its course we find from east to west the following lake depressions:
A lake . . . . . . . . . . . . . . . . . 5138 m. . . . Littledale
Lac du sel rouge . . . . . . . . . . . . 4698 » . . . de Rhins
Near Gomo-tsaka . . . . . . . . . . . . 4843 » . . . Hedin
Near a lake . . . . . . . . . . . . . . 4901 » . . . Bower
Near a lake . . . . . . . . . . . . . . 5132 » . . . Bower
The mean altitude of these depressions is 4942 m.
It now only remains to say a few words regarding the folding troughs north
of my valley of 1896. They are, of course, innumerable as all over Tibet, and it is
sufficient for our purpose to consider only two of them.
Between the mighty system of the Arka-tagh with its more or less detached
ramifications towards the north, and the Kalta-alakan, Piazlik-tagh and the western part
of Astin-tagh, there is a folding trough beginning in the east with the Chulak-akkan
valley of CAREY and DALGLEISH and continuing westwards across:
Bulak-bashi. . . . . . . . 3922 m. Aikin-otak . . . . . . . . 4795 m.
Bash-kum-köl . . . . . . . 3882 » A Pass . . . . . . . . . . 5108 »
Ayagh-kum-köl . . . . . . 3867 » Mandarlik in Patkaklik-darya 3511 »
It would be of no use to calculate an average altitude for the whole stretching
of this trough, for in the east it goes on without interruption into the Tsaidam
Basin, and in the west by Cherchen-darya into the Tarim Basin. The most chara-
cteristic part of the trough is that of the two lakes, the mean altitude of which is
3875 m. Nor do the eastern and western flanks of this trough belong to the self-
contained regions of Tibet.
The last, and more conspicuous folding-trough, lies altogether outside of the self-
contained region. It has Akato-tagh to the north, and Piazlik-tagh, Kalta-alakan and
Chimen-tagh to the south. Its valley is called simply Kakir, and its watercourse is
directed to the lake Ghaz-nor or Chimen-köl at an altitude of 2837 m. The altitudes
of these two troughs therefore indicate two steps downwards to the plains of Gobi.
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117
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128
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138
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150
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263
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277
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291
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302
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315
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329
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342
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352
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363
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375
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386
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397
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407
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420
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432
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444
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457
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467
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478
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488
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499
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510
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520
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530
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541
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552
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563
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573
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583
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593
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605
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615
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625
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635
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646
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656
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666
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681
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693
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704
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714
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726
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737
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747
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749
750
751
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758
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773
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788
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801
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813
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833
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848
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864
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876
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888
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