Southern Tibet : vol.7 / 652 ページ（カラー画像）

0652	Southern Tibet : vol.7
南チベット : vol.7

with that met with on the Sasser Karakoram track, certainly includes the permian
and trias, together with older beds at the base and newer ones above.» No-
varese accepts, provisionally, a similar correlation for the sedimentary series of the
Upper Baltoro.

According to the observations of all explorers the Baltoro valley, from the end
of the glacier up to the confluence of the Godwin-Austen Glacier, is opened through
the gneisses and granites of the Baltistan massif. On the right of the Baltoro, however,
in front of Rdokass, Novarese finds it probable that the remnants of an enormous,
nearly horizontal layer is superimposed on the massive gneiss. In this part of the
Mustagh, therefore, may exist the remains of a capping of sedimentary rock regularly
covering the gneiss and composed of dolomites.

On the right of the Baltoro, opposite and north of Mitre Peak, a marble crag
rises from one of the buttresses of Crystal Mountain.

»The formation of schists, anagenites, limestones and dolomites shows up in
its full development in the terminal mass, lying between the Godwin-Austen and
Upper Baltoro Glaciers, which is crowned by the three peaks Broad, Gasherbrum
and Hidden.» Bride Peak seems to be composed of gneiss above, and at the base,
of granites and granitoid gneisses. The base of K 2 is formed of the same materials.
Many questions are left obscure on account of the scarcity of specimens from rock
in situ. Novarese summarizes the results as follows: »The valley of the great glacier
is closed on the north by a very elevated massif, composed of sedimentary rocks of
upper palæozoic and mesozoic age, prevailingly calcareous and, therefore, differing
widely from the mountains of the rest of the valley, which are entirely, or prevailingly,
granitic and gneissic».

The terminal peaks of Broad, Gasherbrum IV, Hidden and Golden Throne,
seem to be formed of limestone and dolomite. They are thus the first known peaks
of about 26,500 feet formed of sedimentary rocks.

In 1878 STOLICZKA, and later on LYDEKKER, described the palæo-mesozoic
rocks in the Chang-chenmo-Kara-korum region of Eastern Ladak. This palæo-
mesozoic area runs north-westwards, parallel to the gneissic mass of Baltistan. »It
had been traced to Sisil, between the Nubra and Shyok valleys, on the road to the
Kara-koram Pass, but its ultimate course and end remained unknown.» The mesozoic
limestone seems to continue for some 90 miles, including parts at the Upper Siachen
and Gasherbrum.

Novarese points to the geographical importance of this fact. »The course of
the watershed between the Indus valley and the closed drainage area of Turkestan,
from the Mustagh to the Kara-koram Pass, was uncertain and badly known, in spite
of certain peaks having been trigonometrically fixed, as it had been barely seen and
never crossed by the explorers who followed each other at long intervals.»

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

引用情報

OCR読み取り結果

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

引用情報

OCR読み取り結果

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