Spatial variability of modern tectonic stress fields in the north‐eastern margin of Tibetan Plateau

2020 ◽  
Vol 55 (11) ◽  
pp. 7167-7192
Author(s):  
Liming Li ◽  
Xianrui Li ◽  
Mingtao Li ◽  
Zhirong Liang ◽  
Jingxiong Tian ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Spatial Variability ◽  
Tectonic Stress ◽  
Stress Fields ◽  
Eastern Margin ◽  
The North ◽  
North Eastern

Nouvelles observations sur la serie de la Gara Sayada (bordure nord-est de l'Eglab, Sahara occidental)

1961 ◽  
Vol S7-III (2) ◽  
pp. 127-132
Author(s):  
Pierre Dourthe ◽  
O. Serra
Keyword(s):  
Western Sahara ◽  
Eastern Margin ◽  
The North ◽  
North Eastern

Abstract A subhorizontal sandy series, the Gara Sayada series, some hundreds of meters thick, overlies a folded sandstone-shale series, more than 1,000 meters thick, on the north-eastern margin of the Eglab massif (Algeria) in the western Sahara. The intra-Caradocian (Ordovician) unconformity already known at several other localities in the Sahara is thus also represented in this region.

Petroleum system of the North-Eastern margin of the Pechora Platform

1996 ◽  
Author(s):  
V. Martirosyan ◽  
A. Simonov ◽  
L. Popova ◽  
F. Kevorkov ◽  
L. Tichomirova
Keyword(s):  
Petroleum System ◽  
Eastern Margin ◽  
The North ◽  
North Eastern

scholarly journals Nitrogen fertilizer regulates soil respiration by altering the organic carbon storage in root and topsoil in alpine meadow of the north-eastern Qinghai-Tibet Plateau

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Wen Li ◽  
Jinlan Wang ◽  
Xiaolong Li ◽  
Shilin Wang ◽  
Wenhui Liu ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Tibetan Plateau ◽  
Soil Respiration ◽  
Alpine Meadow ◽  
Growing Season ◽  
N Storage ◽  
The North ◽  
C Storage ◽  
North Eastern ◽  
C And N

Abstract Soil respiration (Rs) plays a critical role in the global carbon (C) balance, especially in the context of globally increasing nitrogen (N) deposition. However, how N-addition influences C cycle remains unclear. Here, we applied seven levels of N application (0 (N0), 54 (N1), 90 (N2), 126 (N3), 144 (N4), 180 (N5) and 216 kg N ha−1 yr−1 (N6)) to quantify their impacts on Rs and its components (autotrophic respiration (Ra) and heterotrophic respiration (Rh)) and C and N storage in vegetation and soil in alpine meadow on the northeast margin of the Qinghai-Tibetan Plateau. We used a structural equation model (SEM) to explore the relative contributions of C and N storage, soil temperature and soil moisture and their direct and indirect pathways in regulating soil respiration. Our results revealed that the Rs, Ra and Rh, C and N storage in plant, root and soil (0–10 cm and 10–20 cm) all showed initial increases and then tended to decrease at the threshold level of 180 kg N ha−1 yr−1. The SEM results indicated that soil temperature had a greater impact on Rs than did volumetric soil moisture. Moreover, SEM also showed that C storage (in root, 0–10 and 10–20 cm soil layers) was the most important factor driving Rs. Furthermore, multiple linear regression model showed that the combined root C storage, 0–10 cm and 10–20 cm soil layer C storage explained 97.4–97.6% variations in Rs; explained 94.5–96% variations in Ra; and explained 96.3–98.1% in Rh. Therefore, the growing season soil respiration and its components can be well predicted by the organic C storage in root and topsoil in alpine meadow of the north-eastern Qinghai-Tibetan Plateau. Our study reveals the importance of topsoil and root C storage in driving growing season Rs in alpine meadow on the northeast margin of Qinghai-Tibetan Plateau.

scholarly journals Notes on the Permian to Recent Geology of the Kruger National Park

Koedoe ◽  
1986 ◽  
Vol 29 (1) ◽  
Author(s):  
J.W. Bristow ◽  
F.J. Venter
Keyword(s):  
National Park ◽  
Kruger National Park ◽  
Eastern Margin ◽  
The North ◽  
North Eastern ◽  
Extreme North

Permian to Recent rocks form narrow, roughly north- south and east-south-east trending belts in the north-eastern Transvaal. The rocks consist of a thin succession of Karoo sediments, a thick overlying succession of mafic and felsic volcanics referred to as the Lebombo Group, isolated outcrops of Cretaceous sediments and fairly extensive Tertiary-Recent Gravels and sediments. These rocks are in general well exposed along the eastern margin of the Kruger National Park and also crop out in the extreme north. Emplacement of the Lebombo volcanics and subsequent deposition of the Cretaceous rocks was intimately associated with the fragmentation of Gondwanaland.

scholarly journals Cryoconite on a glacier on the north-eastern Tibetan plateau: light-absorbing impurities, albedo and enhanced melting

2019 ◽  
Vol 65 (252) ◽  
pp. 633-644 ◽  
Author(s):  
YANG LI ◽  
SHICHANG KANG ◽  
FANGPING YAN ◽  
JIZU CHEN ◽  
KUN WANG ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Mass Balance ◽  
Glacier Mass Balance ◽  
Eastern Tibetan Plateau ◽  
The North ◽  
Ice Surface ◽  
Northern Tibetan Plateau ◽  
North Eastern ◽  
The Mean

ABSTRACTCryoconite is a dark-coloured granular sediment that contains biological and mineralogical components, and it plays a pivotal role in geochemistry, carbon cycling and glacier mass balance. In this work, we collected cryoconite samples from Laohugou Glacier No. 12 (LHG) on the north-eastern Tibetan Plateau during the summer of 2015 and measured the spectral albedo. To explore the impacts of this sediment on surface ablation, the ice melting differences between the cryoconite-free (removed) ice and the intact layers were compared. The results showed that the mean concentrations of black carbon (BC), organic carbon (OC) and total iron (Fe) in the LHG cryoconite were 1.28, 11.18 and 39.94 mg g−1, respectively. BC was found to play a stronger role in solar light adsorption than OC and free Fe. In addition, ice covered by cryoconite exhibited the lowest mean reflectance (i.e., <0.1). Compared with the cryoconite-free ice surface, cryoconite effectively absorbed solar energy and enhanced glacial melting at a rate of 2.27–3.28 cm d−1, and free Fe, BC and OC were estimated to contribute 1.01, 0.99 and 0.76 cm d−1, respectively. This study provides important insights for understanding the role of cryoconite in the glacier mass balance of the northern Tibetan Plateau.

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