scholarly journals Indentation of the Pamirs with respect to the northern margin of Tibet: Constraints from the Tarim basin sedimentary record

Tectonics ◽  
2016 ◽  
Vol 35 (10) ◽  
pp. 2345-2369 ◽  
Author(s):  
Tamsin Blayney ◽  
Yani Najman ◽  
Guillaume Dupont‐Nivet ◽  
Andrew Carter ◽  
Ian Millar ◽  
...  
Keyword(s):  
Tarim Basin ◽  
Sedimentary Record ◽  
Northern Margin

Deep structure at northern margin of Tarim Basin

2008 ◽  
Vol 53 (10) ◽  
pp. 1544-1554 ◽  
Author(s):  
JunMeng Zhao ◽  
HongGang Cheng ◽  
ShunPing Pei ◽  
HongBing Liu ◽  
JianShi Zhang ◽  
...  
Keyword(s):  
Tarim Basin ◽  
Deep Structure ◽  
Northern Margin

scholarly journals Effects of Salt Thickness on the Structural Deformation of Foreland Fold-and-Thrust Belt in the Kuqa Depression, Tarim Basin: Insights From Discrete Element Models

2021 ◽  
Vol 9 ◽  
Author(s):  
Changsheng Li ◽  
Hongwei Yin ◽  
Zhenyun Wu ◽  
Peng Zhou ◽  
Wei Wang ◽  
...  
Keyword(s):  
Shear Stress ◽  
Tarim Basin ◽  
Structural Characteristics ◽  
Discrete Element ◽  
Structural Deformation ◽  
Tectonic Deformation ◽  
Kuqa Depression ◽  
Northern Margin ◽  
Salt Layer ◽  
Thrust System

The salt layer is critical for the structural deformation in the salt-bearing fold-and-thrust system, which not only acts as the efficient décollement layer but also flows to form salt tectonics. Kuqa Depression has a well-preserved thin-skinned fold-and-thrust system with the salt layer as the décollement. To investigate the effects of salt thickness on the structural deformation in the Kuqa Depression, three discrete element models with different salt thicknesses were constructed. The experiment without salt was controlled by several basal décollement dominant faults, forming several imbricate sheets. The experiments with salt developed the decoupled deformation with the salt layer as the upper décollement (subsalt, intrasalt, and suprasalt), significantly similar to the Kuqa Depression along the northern margin of Tarim Basin. Basal décollement dominant imbricated thrusts formed at the subsalt units, while the monoclinal structure formed at the suprasalt units. The decoupled deformation was also observed in the tectonic deformation graphics, distortional strain fields, and max shear stress fields. However, the salt layer was thickened in the thick salt model, and the salt thickness of the thin salt model varied slightly because the thin salt weakened the flowability of the salt. The lower max shear stress zone was easily formed in the distribution region of salt under the action of compression stress, which is conducive to the flow convergence of salt and the crumpled deformation of interlayer in salt. The results are well consistent with the natural characteristics of structural deformation in the Kuqa Depression. Our modeling result concerns the structural characteristics and evolution of salt-related structures and the effects of salt thickness on the structural deformation in the compressional stress field, which might be helpful for the investigations of salt-related structures in other salt-bearing fold-and-thrust belts.

scholarly journals Organic carbon, bitumen content and maturity of Lower Cambrian source rocks in the northern margin of Tarim Basin

2020 ◽  
Vol 600 ◽  
pp. 012042
Author(s):  
Haijun Yang ◽  
Shuang Yu ◽  
Haizu Zhang ◽  
Tengfei Li ◽  
Huifang Zhang ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Tarim Basin ◽  
Lower Cambrian ◽  
Source Rocks ◽  
Northern Margin ◽  
Bitumen Content

Tectonic evolution of Tethyan tectonic field, formation of Northern Margin basin and explorative perspective of natural gas in Tarim Basin

2002 ◽  
Vol 47 (S1) ◽  
pp. 34-41 ◽  
Author(s):  
Shufeng Yang ◽  
Chengzao Jia ◽  
Hanlin Chen ◽  
Guoqi Wei ◽  
Xiaogan Cheng ◽  
...  
Keyword(s):  
Natural Gas ◽  
Tarim Basin ◽  
Tectonic Evolution ◽  
Northern Margin ◽  
Field Formation

scholarly journals Fold-Related Fracture Distribution in Neogene, Triassic, and Jurassic Sandstone Outcrops, Northern Margin of the Tarim Basin, China: Guides to Deformation in Ultradeep Tight Sandstone Reservoirs

Lithosphere ◽  
2021 ◽  
Vol 2021 (Special 1) ◽  
Author(s):  
Junpeng Wang ◽  
Lianbo Zeng ◽  
Xianzhang Yang ◽  
Chun Liu ◽  
Ke Wang ◽  
...  
Keyword(s):  
Tarim Basin ◽  
Gas Production ◽  
Shear Mode ◽  
Fracture Density ◽  
Tight Sandstone ◽  
Supply Source ◽  
Northern Margin ◽  
Fracture Patterns ◽  
Fracture Development ◽  
Opening Mode

Abstract Ultradeep (6-8 km depth) low-porosity sandstone oil and gas reservoirs, in the Kuqa thrust belt of Tarim Basin, are an important natural gas supply source of China. Both opening and shear-mode fractures are extremely necessary reservoir elements for gas production in these rocks but are challenging to characterize with sparse core and well log observations. Here, we use outcrops of some of the same units from four exposed folds to describe fracture types and patterns. These four folds have a range of shapes that are representative of folds at depth. At the Dongq, Kuqa, Misib, and Tuger anticlines, we analyzed fracture type, cross-cutting and abutting relations, density, spatial arrangement, kinematic aperture, orientation, and mineral fill. One-dimensional inventories, field sketches, photographs, and LiDAR imagery documented fracture patterns. Most dips of all fractures shown everywhere on the fold are greater than 60 degrees (over 50%). Fracture kinematic apertures are 3 mm to ~6 mm, and fracture density is 0.5 traces/m to ~1.5 traces/m. All fractures are divided into shear mode (or small faults) and opening mode. Shear-mode fractures, with high dips that strike N-S, mutually crosswise arranged with intersection angles of 30-60 degrees, are found extensively on the flanks of these folds. In contrast, most opening-mode fractures strike E-W, are arranged parallel to each other, and are localized in fold hinges. Besides, exposed folds (reservoir analogues, figure 1) in a proximal (hinterland, Tuger and Misib) position have fracture abundance distributions and aperture size patterns compatible with fold-related fracture development whereas distal (basinward, Kuqa and Dongq) folds lack this correlation, but patterns in distal folds might be explained by overprinted effects of lithological heterogeneity on fracture abundance or the effects of nearby faults. The positive correlation between fold-related strain and fracture spatial distribution in the northern (proximal) folds permitted inference of fracture patterns in deep wells.

Rudists of Tibet and the Tarim Basin, China: Significance to Requieniidae phylogeny

2010 ◽  
Vol 84 (3) ◽  
pp. 444-465 ◽  
Author(s):  
Robert W. Scott ◽  
Xiaqiao Wan ◽  
Jingeng Sha ◽  
Shi-Xuan Wen
Keyword(s):  
Tarim Basin ◽  
Three Dimensional ◽  
Indian Plate ◽  
Carbonate Platforms ◽  
Southern Tibet ◽  
Northern Margin ◽  
The Family ◽  
Anoxic Events ◽  
Lateral Extent ◽  
End Members

Rudists are a principal biotic component of Cretaceous carbonates in Tibet and in the Western Tarim Basin. Barremian to Maastrichtian carbonate units are widespread on the northern margin of the Indian Plate and in Tethyan tectonic slices that were welded onto Eurasia in successive stages during the Late Cretaceous and Paleogene. In far northwestern Tibet, Barremian-Cenomanian endemic rudists and cosmopolitan orbitolinid foraminifera occupied isolated carbonate platforms in the eastern Tethys. Rudists, corals, and stromatoporoids composed bioherms up to 10 m thick and several kilometers in lateral extent. A unique endemic requieniid rudist,Rutonia, is compared to morphologically similar but older, less derived genera. Associated specimens in this assemblage are indeterminate requieniid valves, monopleurids, and two genera with three radiolitid species that are re-described and taxonomic positions re-evaluated. In southern Tibet, mainly endemic Campanian-Maastrichtian radiolitid rudists and cosmopolitan larger benthic foraminifera contributed to carbonate shelves on the northern Indian Plate near the Cretaceous equator. In the Western Tarim Basin Cenomanian strata yield Tethyan rudist species.Coiling morphometric analysis using the three-dimensional morphology Raup diagram shows that Requieniidae valves in contact with the substrate are convergent with the basic gastropod shell. More derived strongly coiled, younger requieniids were adapted to encrusting or semi-infaunal habits. Stratigraphic analysis confirms that Requieniidae diversity crises coincided with Cretaceous oceanic anoxic eventsTwo end members of valve geometry each appear to be primitive and derived characters respectively and separate the family Requieniidae into two clades that are here recognized as two new subfamilies. The end members are defined by the coiling geometry, whether the spire is close to the plane of commissure or it is translated along the coiling axis and by myophore structures. The older matheroniform clade has a low spirogyrate LV that is translated slightly from the commissure along the coiling axis; this group is composed ofMatheronia(and its subgenusMonnieria),Hypelasma, Lovetchenia, Rutonia, andKugleria.Genera in the younger clade have a tall trochospiral LV that is translated along the coiling axis and consists ofRequienia, Toucasia, Pseudotoucasia, Apricardia, Bayleoidea, andBayleia.Claditics support these relationships.

The earliest well-dated archeological site in the hyper-arid Tarim Basin and its implications for prehistoric human migration and climatic change

2014 ◽  
Vol 82 (1) ◽  
pp. 66-72 ◽  
Author(s):  
WenXia Han ◽  
LuPeng Yu ◽  
ZhongPing Lai ◽  
David Madsen ◽  
Shengli Yang
Keyword(s):  
Tibetan Plateau ◽  
Tarim Basin ◽  
Human Migration ◽  
The Tibetan Plateau ◽  
Human Occupation ◽  
Stepping Stones ◽  
Northern Margin ◽  
Archeological Site ◽  
Early Human ◽  
The Silk Road

AbstractThe routes and timing of human occupation of the Tibetan Plateau (TP) are crucial for understanding the evolution of Tibetan populations and associated paleoclimatic conditions. Many archeological sites have been found in/around the Tarim Basin, on the northern margin of the Tibetan Plateau. Unfortunately, most of these sites are surface sites and cannot be directly dated. Their ages can only be estimated based on imprecise artifact comparisons. We recently found and dated an archeological site on a terrace along the Keriya River. Our ages indicate that the site was occupied at ~7.0–7.6 ka, making it the earliest well-dated archeological site yet identified in the Tarim Basin. This suggests that early human foragers migrated into this region prior to ~7.0–7.6 ka during the early to mid-Holocene climatic optimum, which may have provided the impetus for populating the region. We hypothesize that the Keriya River, together with the other rivers originating from the TP, may have served as access routes onto the TP for early human foragers. These rivers may also have served as stepping stones for migration further west into the now hyper-arid regions of the Tarim Basin, leading ultimately to the development of the Silk Road.

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