Sedimentary record from Lake Hovsgol, NW Mongolia: Results from the HDP-04 and HDP-06 drill cores

被引：30

作者：

Abzaeva, A. A. ^{[2
]}

Bezrukova, E. V. ^{[2
]}

Bychinsky, V. A. ^{[2
]}

Fedenya, S. A. ^{[3
]}

Fukishi, K. ^{[4
]}

Gelety, V. F. ^{[2
,4
]}

Goreglyad, A. V. ^{[2
]}

Ivanov, E. V. ^{[2
]}

Kalmychkov, G. V. ^{[2
]}

Kashiwaya, K. ^{[4
]}

Kawai, T. ^{[5
]}

Kerber, E. V. ^{[2
]}

Khomutova, M. Yu. ^{[2
]}

Khursevich, G. K. ^{[3
,6
]}

Kim, J. -Y. ^{[7
]}

Krainov, M. A. ^{[2
]}

Kulagina, N. V. ^{[8
]}

Kuzmin, M. L. ^{[2
]}

Letunova, P. P. ^{[2
]}

Minoura, K. ^{[9
]}

Nahm, W. -H. ^{[7
]}

Narantsetseg, Ts. ^{[10
]}

Oyunchimeg, Ts. ^{[10
]}

Prokopenko, A. A. ^{[1
]}

Sakai, H. ^{[11
]}

Solotchina, E. P. ^{[12
]}

Tani, Y. ^{[13
]}

Tkachenko, L. L. ^{[2
]}

Tomurhuu, D. ^{[10
]}

Watanabe, T. ^{[9
]}

机构：

[1] Univ S Carolina, Dept Geol Sci, 701 Sumter St, Columbia, SC 29208 USA

[2] Russian Acad Sci, Inst Geochem, Siberian Branch, Irkutsk 664003, Russia

[3] Natl Acad Sci Belarus, Inst Geol Sci, Minsk 220141, BELARUS

[4] Kanazawa Univ, Kanazawa, Ishikawa 9201192, Japan

[5] Nagoya Univ, Dept Earth & Planetary Sci, Chikusa Ku, Nagoya, Aichi 4648602, Japan

[6] M Tank State Pedag Univ, Dept Bot, Minsk 220809, BELARUS

[7] Korean Inst Geol & Mineral Resources, Taejon 305350, South Korea

[8] Russian Acad Sci, Inst Earth Crust, Siberian Branch, Irkutsk 664033, Russia

[9] Tohoku Univ, Aoba Ku, Sendai, Miyagi 9808578, Japan

[10] Inst Geol & Mineral Resources, Ulaanbaatar 210351, Mongolia

[11] Toyama Univ, Toyama 9308555, Japan

[12] Russian Acad Sci, United Inst Geol Geophys & Mineral, Siberian Branch, Novosibirsk 630090, Russia

[13] Univ Shizuoka, Inst Environm Sci, Suruga Ku, Shizuoka 2408526, Japan

来源：

QUATERNARY INTERNATIONAL | 2009年 / 205卷

基金：

美国国家科学基金会;

关键词：

LAST; 1; MA; PHOTOSYNTHETIC PIGMENTS; NORTHERN MONGOLIA; AGE MODEL; KHUBSUGUL; BAIKAL; PRODUCTIVITY; PLEISTOCENE; TRANSITION; SIGNALS;

D O I：

10.1016/j.quaint.2009.02.008

中图分类号：

P9 [自然地理学];

学科分类号：

0705 ; 070501 ;

摘要：

The Hovsgol Drilling Project retrieved Pleistocene sediment section with the basal age of ca. 1 Ma from the Hovsgol rift basin, NW Mongolia. Detailed lithologic data on drill cores is presented and compared with analogous sediment facies in the radiocarbon-dated records of the last glacial-interglacial transition. Drill cores from two sites, presently in 239 m and 235 m water depth, represent somewhat different depositional settings. The shorter HDP-06 drill core (26 m) at the base of the gentler SE slope of the rift basin contains lithologic evidence for several recent lake lowstands on the order of -200 m. The longer HDP-04 drill core (81 m) some 8 km away at the base of the steep NW underwater slope is composed of finer sediments and contains at least 10 characteristic transitions from calcareous to carbonate-free (diatomaceous) layers. These lithologic transitions are interpreted here as signals of repeated Pleistocene lake transgressions in the Hovsgol basin. Transgressions appear to have been associated with lower sedimentation rates and with the deposition of thin turbidite beds at the drill site. Comparison of drill core lithology with the available seismic data shows reasonable agreement in terms of the number of lowstand events and the general trends of changing lake level. HDP-04 drill core retrieved shallow-water facies containing sand and carbonate oolites deposited at the time of the most dramatic mid-Pleistocene regression of the lake. At ca. 24 m core depth, this interval corresponds to a major basinwide angular unconformity apparent in the seismic pattern. Lake Hovsgol, a smaller sister rift lake of the grand Lake Baikal, has a confined local catchment, which makes it very sensitive to regional variations in the effective moisture. Consisting primarily of calcareous mud, the sedimentary record of Lake Hovsgol provides a unique regional sedimentary archive. Future multi-proxy studies of the Hovsgol sedimentary records will allow constraint of the mid-late Pleistocene history of the hydrologic budget in the Baikal region of continental interior Asia. (C) 2009 Elsevier Ltd and INQUA. All rights reserved.

引用

页码：21 / 37

页数：17

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