Long Continental Records from Lake Baikal by Kenji Kashiwaya

By Kenji Kashiwaya

Lake Baikal in jap Siberia is an important web site for detecting long term international alterations, because of its excessive sensitivity to climatic oscillation and its terribly lengthy heritage. simply because lacustrine sediments have a bonus in supplying high-resolution details, the sediments in Lake Baikal include very good non-stop documents of previous stipulations together with paleoclimates, evolution, and specification of organisms. in response to the learn by means of the Baikal Drilling venture, this e-book presents info on international climatic and environmental alterations for up to 12 million years. The booklet additionally comprises discussions of relatively momentary alterations equivalent to glacial and interglacial transitions that at once hyperlink to the current and destiny atmosphere. Long Continental documents from Lake Baikal summarizes the newest wisdom at the paleoenvironment and offers a beginning for extra reports in international environmental changes.

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P. ". b FIG. 3. a A general view of a comparator of thermal conductivity for thermal conductiv- ity measurements. b. A diagram of the comparator of thermal conductivity. 1, sample; 2, copper tips; 3, spherical ends of thermal probes; 4, thermal probes, made of brass; 5, measuring thermocouple; 6, copper plates; 7, regulating thermocouple; 8, thermoelectric battery; 9, automatic regulator; 10, voltmeter Geothermal Studies in Lake Baikal 49 core N2 were made on the barge immediately after the core recovery by pressing the probe into its butt-ends.

5 o :J o Z o o o o 25 50 75 FIG. 5. Distribution of the thermal conductivity of sediments in 20.. m successive segments down the column. 44, mean over eight measurements), which was obviously due to water loss in the core (Fig. 7). The measurements in the first 5 m showed worse reproducibility (Dorofeeva 1994; Dorofeeva et aL 1994). 2 BDP-96 In total, 512 measurements were made in the BDP-96/1 borehole and 360 measurements in the BDP-96/2 borehole. 68W/mK (see Fig.

No discrepancy in A was obtained in the BDP-98 core at 345-600m by different thermal conductivity measurement techniques (VA. Golubev 1998, personal communication). The mean geothermal gradient in the BDP-98 borehole in the 500-m thick upper sedimentary layer was 60 ± lOmK/m, and the heat flow was 72mW/m2, which is in agreement with earlier published values (Antipin et al. 2000). P. Y. 8 • • 120 160 180 200 ••• • 140 • • • • • ••• • • • ••• ••••••• •• • • • • • FiG. 8.

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