| ORIGIN OF CARBONATE MATERIALS IN THE NORTHERN BASIN OF LAKE BAIKAL AND ITS RELATIONSHIP TO HOLOCENE PALEOCLIMATE |
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| 作者姓名： | 邱林青 F.Williams |
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| 作者单位： | Dept of Geological Sciences，University of South Carolina，Columbia，SC 29208 U.S.A，Dept of Geological Sciences，University of South Carolina，Columbia，SC 29208 U.S.A |
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| 摘 要： | Fine-grained disseminated carbonate was found in Holocene sediments in a core taken from the northern basin of Lake Baikal. The core had two distinct facies. a terrigenous blue-clay overlain by a diatomaceous silt. Oxygen and carbon stable isotope analyses, combined with SEM , X-ray diffraction and .palynology, show that the carbonate in the blue-clay layer is pedogenic in origin, rather than biogenic or authigenic . The S C values in the blue clay suggest that the carbonate is derived from a single source , while the carbonate in the diatom-rich layer might be transported by winds from different sources. On the assumption that the carbonate was formed during the post-glacial age and was transported primarily by river runoff, the 18O isotopic values suggest that the annual temperature in the northern Baikal drainage area was about 3℃ warmer during the middle Holocene (8500-7000 a, B. P.) than during the early Holocene (11 000-8 500a, B.P.) when the blue clay was being deposited . This interpretation is
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| 收稿时间： | 17 March 1992 |
Origin of carbonate materials in the northern Basin of Lake Baikal and its relationship to holocene paleoclimate |
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| Qiu Linqing,Douglas F. Williams.ORIGIN OF CARBONATE MATERIALS IN THE NORTHERN BASIN OF LAKE BAIKAL AND ITS RELATIONSHIP TO HOLOCENE PALEOCLIMATE[J].Chinese Journal of Oceanology and Limnology,1993,11(1):57-69. |
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| Authors: | Qiu Linqing Douglas F Williams |
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| Institution: | (1) Dept of Geological Sciences, University of South Carolina, 29208 Columbia, SC, U.S.A. |
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| Abstract: | Fine-grained disseminated carbonate was found in Holocene sediments in a core taken from the northern basin of Lake Baikal.
The core had two distinct facies, a terrigenous blue-clay overlain by a diatomaceous silt. Oxygen and carbon stable isotope
analyses, combined with SEM, X-ray diffraction and palynology, show that the carbonate in the blue-clay layer is pedogenic
in origin, rather than biogenic or authigenic. The δ13C values in the blue clay suggest that the carbonate is derived from a single source, while the carbonate in the diatom-rich
layer might be transported by winds from different sources. On the assumption that the carbonate was formed during the post-glacial
age and was transported primarily by river runoff, the δ18O isotopic values suggest that the annual temperature in the northern Baikal drainage area was about 3°C warmer during the
middle. Holocene (8500–7000 a, B. P.) than during the early Holocene (11000–8500a, B. P.) when the blue clay was being deposited.
This interpretation, is consistent with the dominant vegetation consisting of grasses in the northern Baikal drainage area
prior to 7000a, B. P., |
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| Keywords: | Lake Baikal carbonate oxygen isotopes carbon isotopes paleoclimate |
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