NDLI: Saline rhythm and climatic change since 20.6 kyr bp from the Qiulinanmu Playa Lake in Tibet

Content Provider	Springer Nature Link
Author	Li, Minghui Kang, Shichang Ge, Jun Yi, Chaolu Fang, Xiaomin
Copyright Year	2010
Abstract	A rare lacustrine rhythmite from the Qiulinanmu Playa Lake in Tibet is presented, which was composed of distinct layers of mirabilite, borax, and clay with thickness measuring 1.5–75 cm, 0.5–20 mm, and 0.5–30 mm, respectively. The thickness of each layer was measured in the field and dating was performed using $^{14}$C and U data. The lake was previously supplied by river water, groundwater, and hot springs enriched in sodium, sulfur, and boron. Control factors on the rhythmite were climate oscillations and compositional differences of water. The adsorption of boron by clay minerals could be attributed to the alternation between clay and borax layers. Low temperature, high pH, and high evaporation exerted significant influences on the precipitation of original borax and mirabilite. In the evaporative lake, the precipitation of mirabilite (a mineral indicative of a cold-dry environment) was dominant and produced the asymmetric couplets. The lake water was poor in chloride and rich in sodium sulfate, and an abrupt change was observed at 11.4 cal. kyr bp. According to the laminated sediment and the thickness of the minerals, the climate was dry-cold with four sub-warm phases before 11.4 kyr bp (after 20.6–11.4 kyr bp), and wet-warm with four sub-cold pulses after 11.4 kyr bp (11.4–5.2 kyr bp). The two thickest mirabilite layers suggested extremely hard conditions after 20.6 kyr bp, and before 11.4 kyr bp, respectively.
Starting Page	5
Ending Page	14
Page Count	10
File Format	PDF
ISSN	08912556
Journal	Carbonates and Evaporites
Volume Number	25
Issue Number	1
e-ISSN	18785212
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-02-05
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Rhythmite Mirabilite Borax Clay Climate and environment Playa Tibet Mineralogy Mineral Resources Geology
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology

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