Differences between East Asian and Indian monsoon climate records during MIS3 attributed to differences in their driving mechanisms: Evidence from the loess record in the Sichuan basin, southwestern China and other continental and marine climate records

Mugecuo Scenic Area is located in the northern Hengduan Mountains between the Sichuan Basin and the Qinghai-Tibet Plateau and has a subtropical humid monsoon climate. The area is at an altitude of 2600–3800 m above sea level (asl), with water originating mostly from melting mountain snow. In the region, a total of 20 Eunotia species have been identified, including two new species: E. mugecuo sp. nov., consisting of valves arched, clavate, ends broadly rounded, and terminal raphe fissures at the junction between valve face and mantle. The other newly-identified species is classified named as E. filiformis sp. nov., consisting of valves gently bent, ends not noticeably or only slightly inflated, broadly rounded, with external terminal raphe fissures curving in an angle of 180° back from apical nodules. Five newly recorded species have been identified in China, including E. odebrechtiana, E. michaelis, E. pomeranica, E. pseudogroenlandica and E. superpaludosa. Here, we discuss the new species and new taxon records through light and scanning microscopic documentation of valve morphology, along with key internal and external valve characteristics, and analyze the distribution of Eunotia in the Mugecuo Scenic Area.

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Moisture Sources and Paths Associated with Warm-Season Precipitation over the Sichuan Basin in Southwestern China: Climatology and Interannual Variability

Journal of Hydrology ◽

10.1016/j.jhydrol.2021.127019 ◽

2021 ◽

pp. 127019

Author(s):

Sihan Zhang ◽

Bo Liu ◽

Guoyu Ren ◽

Tianjun Zhou ◽

Cong Jiang ◽

...

Keyword(s):

Interannual Variability ◽

Sichuan Basin ◽

Warm Season ◽

Southwestern China ◽

Moisture Sources ◽

The Sichuan Basin

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Maṇḍala within the Rock: The Visualization of the Mahāmāyūrī-vidyārājñī and its Altar in Southwestern China, 9th–13th Centuries

Asiatische Studien – Études Asiatiques ◽

10.1515/asia-2018-0029 ◽

2020 ◽

Vol 74 (4) ◽

pp. 945-983

Author(s):

Xiao Yang

Keyword(s):

Sichuan Basin ◽

Southwestern China ◽

Spatial Structures ◽

Text And Image ◽

Esoteric Buddhism ◽

The Sichuan Basin ◽

Temporal And Spatial

Abstract This paper considers visualizations in Chinese medieval esoteric Buddhism in seven sculptural tableaux of the Mahāmāyūrī-vidyārājñī (Peacock Wisdom King 孔雀明王) from rock carving sites in the Sichuan Basin, Southwestern China. Early scholars highlighted the authority of Amoghavajra’s ritual manual for the Mahāmāyūrī images in this area, yet divergences between text and image hold them back from further interpretation. This paper reinvestigates these Mahāmāyūrī shrines “dialectically” by considering the text-image relationship. While keeping Amoghavajra’s ritual manual as a reference, it attempts to decode the meaning of the images and sites based on their own content, and to extrapolate from the text-image divergences how artistic productions and esoteric practices could lead to the presence of such divergences. This involves discussing artistic forms and decorative elements appropriated from exoteric Buddhism, as well as adjustments to the central icon and adjacent narrative scenes weaved within the temporal and spatial transitions. It also includes observations on the grouping between the Mahāmāyūrī and other deities in the larger iconographic program in their affiliated rock-cut sites, which reflects the interaction between this esoteric teaching and other popular beliefs. At least four out of seven examples share the same hierarchical iconographic programs or signature spatial structures similar to the Mahāmāyūrī altar prescribed in Amoghavajra’s ritual manual. It takes these visual or spatial similarities as concrete evidences that the construction of these shrines intended to make altars/maṇḍalas, although in two different ways to represent the esoteric altar and to create a space to conduct such a ritual.

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Prediction of deep-buried gas carbonate reservoir by combining prestack seismic-driven elastic properties with rock physics in Sichuan Basin, southwestern China

Interpretation ◽

10.1190/int-2013-0117.1 ◽

2014 ◽

Vol 2 (4) ◽

pp. T193-T204

Author(s):

Jiqiang Ma ◽

Jianhua Geng ◽

Tonglou Guo

Keyword(s):

Elastic Properties ◽

Seismic Data ◽

Sichuan Basin ◽

Incident Angle ◽

Rock Physics ◽

Carbonate Reservoir ◽

Southwestern China ◽

Marine Carbonate ◽

The Sichuan Basin ◽

Elastic Impedance

The prediction of seismic reservoirs in marine carbonate areas in the Sichuan Basin, southwestern China, is very challenging because the target zone is deeply buried (more than 6 km), with multiphase tectonic movements, complex diagenesis, and low porosity, and the incident angle of the seismic data is finite. We developed reliable hydrocarbon indicators of a marine carbonate deposit based on prestack elastic impedance (EI) and well observations. Although the hydrocarbon indicators can be calculated from elastic parameters, the inversion for EI-driven elastic attributes is usually unstable. To constrain the inversion process, we discovered a new strategy to recover the elastic properties from EIs within a Bayesian framework (called Bayesian elastic parameter inversion from elastic impedance). We applied the strategy to a carbonate reef identified at the center of a study line based on the geologic context and the seismic reflection patterns. We then used rock-physics analyses to classify the lithologies and the reservoir at a well location. Rock-physics modeling quantified the hydrocarbon sensitivity of the elastic attributes. Fluid substitution was used to investigate the effects of pore fluids on the elastic properties. A comparison of two synthetic amplitude-versus-angle responses (for gas and brine saturation) with real seismic data showed that the reservoir was gas charged. Using well-based crossplot analyses, reliable direct hydrocarbon indicators can be constructed for a deeply buried gas reservoir and were effective for interpretation in an area of marine carbonates in the Sichuan Basin.

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