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41.
The widely outcropping igneous and metamorphic rocks of the circum-Baikal region all contain illite and chlorite resulting from early alteration of primary minerals. These rocks were deeply weathered and leached, mainly to kaolinite, under the warm and mostly wet Upper-Cretaceous and Palaeogene climates. During the following severely dry and cold Pleistocene episodes, the glacier cover was restricted, allowing the formation of permafrost, which is still several hundred metres thick in the northern Baikal region, while the lowlands of the central and southern regions belong to the so-called “sporadic permafrost area”. The lack of glacial abrasion during the cryo-arid climate preserved somehow the weathering products of the previous warm periods that presently crop out next to the relics of the periglacial Pleistocene weathering. These relict deposits derived from the same substrate rocks as those weathered during the warm and wet climate, but they differ in the clay composition with the occurrence of a montmorillonite-type smectite that is dominant in some sites. 相似文献
42.
Gerstein MB Lu ZJ Van Nostrand EL Cheng C Arshinoff BI Liu T Yip KY Robilotto R Rechtsteiner A Ikegami K Alves P Chateigner A Perry M Morris M Auerbach RK Feng X Leng J Vielle A Niu W Rhrissorrakrai K Agarwal A Alexander RP Barber G Brdlik CM Brennan J Brouillet JJ Carr A Cheung MS Clawson H Contrino S Dannenberg LO Dernburg AF Desai A Dick L Dosé AC Du J Egelhofer T Ercan S Euskirchen G Ewing B Feingold EA Gassmann R Good PJ Green P Gullier F Gutwein M Guyer MS Habegger L Han T Henikoff JG 《Science (New York, N.Y.)》2010,330(6012):1775-1787
43.
