QUATERNARY PALYNOFLORAS AND PALEOCLIMATE OF THE QAIDAM BASIN, QINGHAI PROVINCE, NORTHWESTERN CHINA

Palynology ◽  
2000 ◽  
Vol 24 (1) ◽  
pp. 95-112 ◽  
Author(s):  
J. DEXIN
Keyword(s):  
Qaidam Basin ◽  
Northwestern China ◽  
Qinghai Province

Evolution of the Miocene megalake in the western Qaidam Basin, northwestern China

2021 ◽  
pp. 110384
Author(s):  
Yu Liang ◽  
Bin Zhang ◽  
Yongshu Zhang ◽  
Yancheng Zhang ◽  
Jun Wang ◽  
...  
Keyword(s):  
Qaidam Basin ◽  
Northwestern China ◽  
Western Qaidam Basin

scholarly journals Methanobacterium movens sp. nov. and Methanobacterium flexile sp. nov., isolated from lake sediment

2011 ◽  
Vol 61 (12) ◽  
pp. 2974-2978 ◽  
Author(s):  
Jinxing Zhu ◽  
Xiaoli Liu ◽  
Xiuzhu Dong
Keyword(s):  
Phylogenetic Analysis ◽  
16S Rrna ◽  
16S Rrna Gene ◽  
Type Strain ◽  
Qaidam Basin ◽  
Sequence Similarity ◽  
Single Cells ◽  
Rrna Gene ◽  
Qinghai Province ◽  
Gram Staining

Two mesophilic methanogenic strains, designated TS-2T and GHT, were isolated from sediments of Tuosu lake and Gahai lake, respectively, in the Qaidam basin, Qinghai province, China. Cells of both isolates were rods (about 0.3–0.5×2–5 µm) with blunt rounded ends and Gram-staining-positive. Strain TS-2T was motile with one or two polar flagella and used only H2/CO2 for growth and methanogenesis. Strain GHT was non-motile, used both H2/CO2 and formate and displayed a variable cell arrangement depending on the substrate: long chains when growing in formate (50 mM) or under high pressure H2 and single cells under low pressure H2. Phylogenetic analysis based on 16S rRNA gene sequences placed the two isolates in the genus Methanobacterium. Strain TS-2T was most closely related to Methanobacterium alcaliphilum NBRC 105226T (96 % 16S rRNA gene sequence similarity). Phylogenetic analysis based on the alpha subunit of methyl-coenzyme M reductase also supported the affiliation of the two isolates with the genus Methanobacterium. DNA–DNA relatedness between the isolates and M. alcaliphilum DSM 3387T was 39–53 %. Hence we propose two novel species, Methanobacterium movens sp. nov. (type strain TS-2T = AS 1.5093T = JCM 15415T) and Methanobacterium flexile sp. nov. (type strain GHT = AS 1.5092T = JCM 15416T).

A 3585-YEAR RING-WIDTH DATING CHRONOLOGY OF QILIAN JUNIPER FROM THE NORTHEASTERN QINGHAI-TIBETAN PLATEAU

IAWA Journal ◽  
2009 ◽  
Vol 30 (4) ◽  
pp. 379-394 ◽  
Author(s):  
Xuemei Shao ◽  
Shuzhi Wang ◽  
Haifeng Zhu ◽  
Yan Xu ◽  
Eryuan Liang ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Tree Ring ◽  
Tree Species ◽  
Qaidam Basin ◽  
Ring Width ◽  
Northwestern China ◽  
Tree Ring Width ◽  
Living Tree ◽  
Qilian Juniper

This article documents the development of a precisely dated and wellreplicated long regional tree-ring width dating chronology for Qilian juniper (Juniperus przewalskii Kom.) from the northeastern Qinghai- Tibetan Plateau. It involves specimens from 22 archeological sites, 24 living tree sites, and 5 standing snags sites in the eastern and northeastern Qaidam Basin, northwestern China. The specimens were cross-dated successfully among different groups of samples and among different sites. Based on a total of 1438 series from 713 trees, the chronology covers 3585 years and is the longest chronology by far in China. Comparisons with chronologies of the same tree species about 200 km apart suggest that this chronology can serve for dating purposes in a region larger than the study area. This study demonstrates the great potential of Qilian juniper for dendrochronological research.

Sequence paleogeography and coal accumulation of the Early–Middle Jurassic in central Qilian Mountain belt (Muli Basin), Qinghai Province, northwestern China

AAPG Bulletin ◽  
2018 ◽  
Vol 102 (09) ◽  
pp. 1739-1762 ◽  
Author(s):  
Xiaoxu Shang ◽  
Longyi Shao ◽  
Wenlong Zhang ◽  
Jinggao Lv ◽  
Weichao Wang ◽  
...  
Keyword(s):  
Middle Jurassic ◽  
Northwestern China ◽  
Qilian Mountain ◽  
Qinghai Province ◽  
Mountain Belt ◽  
Coal Accumulation

Geochemistry, zircon geochronology, and isotopic systematics of the Zhanbuzhale granites in the East Kunlun, Qinghai Province, northwestern China: implications for the tectonic setting

2020 ◽  
Vol 57 (2) ◽  
pp. 275-291
Author(s):  
Hao-Ran Li ◽  
Ye Qian ◽  
Feng-Yue Sun ◽  
Liang Li
Keyword(s):  
Tectonic Setting ◽  
Alkali Feldspar ◽  
Northwestern China ◽  
Geochemical Data ◽  
Calc Alkaline ◽  
Qinghai Province ◽  
East Kunlun ◽  
Initial Stage ◽  
High K ◽  
Tethys Ocean

The Zhanbuzhale region, in the Eastern Kunlun Orogen of northwestern China, is characterized by large volumes of Phanerozoic granitoid rocks and is an ideal region for investigating the tectonic evolution of the Paleo-Tethys system. However, the exact timing of the final closure of the Paleo-Tethys Ocean and initial continental collision remains controversial because of a lack of precise geochronological and detailed geochemical data. In this paper, we report new zircon U–Pb ages and mineralogical, petrographic, and geochemical data for samples of Middle Triassic granodiorite and alkali feldspar granite from the Zhanbuzhale region. The zircon U–Pb ages indicate that the granodiorite and alkali feldspar granite formed at 239 and 236 Ma, respectively. The granodiorites are high-K calc-alkaline, metaluminous, high Sr content, high Sr/Y ratios, low Y content, and show adakite-like affinities. The alkali feldspar granites display high SiO2, extremely low MgO, and low Zr+Nb+Ce+Y contents as well as low Fe2O3t/MgO ratios, showing metaluminous to peraluminous and high-K calc-alkaline features. Geochemical and petrological characteristics of the alkali feldspar granites suggest that they are highly fractionated I-type granites. The granodiorites and alkali feldspar granites have zircon εHf(t) values ranging from –2.26 to –0.18, and from –2.17 to +2.18, respectively. Together with regional geological data, we propose that the Triassic (approximately 239–236 Ma) granitoids were generated during the later stages of northward subduction of the Paleo-Tethys oceanic plate, and that the initial stage of collision between the East Kunlun and the Bayan Har–Songpan Ganzi terrane occurred at approximately 236–227 Ma.

scholarly journals First genotyping of Blastocystis in yaks from Qinghai Province, northwestern China

2019 ◽  
Vol 12 (1) ◽  
Author(s):  
Mei Ren ◽  
Jun-ke Song ◽  
Fan Yang ◽  
Min Zou ◽  
Pin-xue Wang ◽  
...  
Keyword(s):  
Northwestern China ◽  
Qinghai Province

LP/HT metamorphic rocks in Wulan County, Qinghai Province: An Early Paleozoic paired metamorphic belt on the northern Qaidam Basin?

2015 ◽  
Vol 60 (35) ◽  
pp. 3501-3513 ◽  
Author(s):  
LiangChao DA ◽  
Zhen YAN ◽  
Yu HAN ◽  
XiuCai LI ◽  
YuSong WANG ◽  
...  
Keyword(s):  
Qaidam Basin ◽  
Metamorphic Rocks ◽  
Early Paleozoic ◽  
Metamorphic Belt ◽  
Qinghai Province

scholarly journals Marivita lacus sp. nov., isolated from a saline lake

2015 ◽  
Vol 65 (Pt_6) ◽  
pp. 1889-1894 ◽  
Author(s):  
Zhi-Ping Zhong ◽  
Ying Liu ◽  
Ting-Ting Hou ◽  
Hong-Can Liu ◽  
Yu-Guang Zhou ◽  
...  
Keyword(s):  
Phylogenetic Trees ◽  
Saline Lake ◽  
Qaidam Basin ◽  
Sequence Similarity ◽  
Rrna Gene ◽  
Aerobic Bacterium ◽  
Respiratory Quinone ◽  
Qinghai Province ◽  
Gram Staining ◽  
Bacterium Strain

A Gram-staining-negative, strictly heterotrophic and aerobic bacterium, strain TS-T44T, was isolated from a saline lake, Tuosu Lake in Qaidam basin, Qinghai province, China. Its taxonomic position was investigated using a polyphasic approach. Cells of strain TS-T44T were non-endospore-forming, non-motile rods, 0.8–1.2 μm wide and 1.2–3.0 μm long. Catalase- and oxidase-positive. Growth occurred in the presence of up to 8  % (w/v) NaCl (optimum, 3.0  %) and at 15–35 °C (optimum, 25 °C) and pH 7.0–10.0 (optimum, pH 7.5–8.5). C18 : 1ω7c was the predominant fatty acid. The major respiratory quinone was Q-10. The major polar lipids were phosphatidylcholine, phosphatidylglycerol, phosphatidylethanolamine, an unidentified aminolipid and an unknown lipid. The DNA G+C content was 65.5 mol% [determined from the melting temperature (Tm)]. Phylogenetic trees based on 16S rRNA gene sequences showed that strain TS-T44T was associated with the genus Marivita and showed highest sequence similarity to Marivita cryptomonadis CL-SK44T (97.7  %), Marivita litorea CL-JM1T (97.5  %) and Marivita geojedonensis DPG-138T (97.3  %), and < 97  % to other species. DNA–DNA relatedness of strain TS-T44T to M. cryptomonadis JCM 15447T, M. litorea JCM 15446T and M. geojedonensis KCTC 23882T was 23 ± 3  %, 33 ± 4  % and 35 ± 2  %, respectively. Based on the data presented, it is concluded that strain TS-T44T represents a novel species of the genus Marivita, for which the name Marivita lacus sp. nov. is proposed. The type strain is TS-T44T ( = CGMCC 1.12478T = JCM 19516T).

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