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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| 0740 |
Southern Tibet : vol.7 |
| 南チベット : vol.7 |
引用情報
OCR読み取り結果
uppermost Tsangpo valley is no less than 225 m. higher than the corresponding part
of the Selling-tso—Panggong-tso depression.
On p. 537 of this volume the mean altitudes of the passes of the three great
mountain systems and the mean altitudes of the two depressions between them, are
put together. Examining now the difference of altitude between the Tsangpo from
its source to Shigatse, and the mean altitude of the great water-parting passes of
the Transhimalaya, we get for the five last stations (from the source to Camp CXCII)
856 m.; for the five middle stations (from Camp CXCII to a point between Ye and
Pusum) 1204 m.; and for the five stations near and above Shigatse, 1688 m.¹ The
difference in altitude thus regularly increases to the east, and continues of course to
do so also east of Shigatse. The same course of development would have taken
place in the case of the two northern depressions and their rivers if the climate had
remained moist and if the old rivers had been allowed to erode their valleys without
interruption. No subaerial deposits or solid material of any kind would then have
been allowed to remain in the valleys, which would have presented the same sculpture
and alpine morphology as the Tsangpo valley near Shigatse, though certainly not
on the same magnificent scale, for the precipitation must always have been less
abundant in the interior than at the margins of the Tibetan highland.
It would be a great mistake to believe that the same enormous lapse of time
that has been necessary for the Tsangpo to cut down its valley to a depth of 800,
1200, 1600 and more meters below the Transhimalayan passes was necessary for the
transformation of the Selling-tso — Panggong-tso valley into a series of plateaux
through filling up the old valley with subaerial and sedimentary matter. And it
would also be wrong to suppose that the deposits of the plateau basins could anywhere
have reached a thickness corresponding to the depth of the Tsangpo valley. For
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28
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49
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60
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70
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81
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92
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105
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117
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128
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138
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150
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161
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177
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190
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202
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214
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225
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237
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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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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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739
740
741
742
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747
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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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