Gold deposits in the Xiaoqinling-Xiong'ershan region, Qinling Mountains, central China

2002 ◽  
Vol 37 (3-4) ◽  
pp. 306-325 ◽  
Author(s):  
Jingwen Mao ◽  
Richard Goldfarb ◽  
Zhengwei Zhang ◽  
Wenyi Xu ◽  
Yumin Qiu ◽  
...  
Keyword(s):  
Gold Deposits ◽  
Central China ◽  
Qinling Mountains

scholarly journals Impact of Climate Change on Potential Distribution of Chinese White Pine Beetle Dendroctonus armandi in China

Forests ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 544
Author(s):  
Hang Ning ◽  
Ming Tang ◽  
Hui Chen
Keyword(s):  
Climate Change ◽  
Potential Distribution ◽  
Greenhouse Gas Emission ◽  
Central China ◽  
Qinling Mountains ◽  
Climate Scenarios ◽  
Impact Of Climate Change ◽  
Precipitation Seasonality ◽  
Suitable Area ◽  
The Impact

Dendroctonus armandi (Coleoptera: Curculionidae: Scolytidae) is a bark beetle native to China and is the most destructive forest pest in the Pinus armandii woodlands of central China. Due to ongoing climate warming, D. armandi outbreaks have become more frequent and severe. Here, we used Maxent to model its current and future potential distribution in China. Minimum temperature of the coldest month and precipitation seasonality are the two major factors constraining the current distribution of D. armandi. Currently, the suitable area of D. armandi falls within the Qinling Mountains and Daba Mountains. The total suitable area is 15.83 × 104 km2. Under future climate scenarios, the total suitable area is projected to increase slightly, while remaining within the Qinling Mountains and Daba Mountains. Among the climate scenarios, the distribution expanded the most under the maximum greenhouse gas emission scenario (representative concentration pathway (RCP) 8.5). Under all assumptions, the highly suitable area is expected to increase over time; the increase will occur in southern Shaanxi, northwest Hubei, and northeast Sichuan Provinces. By the 2050s, the highly suitable area is projected to increase by 0.82 × 104 km2. By the 2050s, the suitable climatic niche for D. armandi will increase along the Qinling Mountains and Daba Mountains, posing a major challenge for forest managers. Our findings provide information that can be used to monitor D. armandi populations, host health, and the impact of climate change, shedding light on the effectiveness of management responses.

Geology, distribution, and classification of gold deposits in the western Qinling belt, central China

2002 ◽  
Vol 37 (3-4) ◽  
pp. 352-377 ◽  
Author(s):  
Jingwen Mao ◽  
Yumin Qiu ◽  
Richard Goldfarb ◽  
Zhaochong Zhang ◽  
Steve Garwin ◽  
...  
Keyword(s):  
Gold Deposits ◽  
Central China ◽  
Western Qinling

Disturbance history of an old-growth subalpine larch forest in the Qinling Mountains, north-central China

2018 ◽  
Vol 50 ◽  
pp. 91-97 ◽  
Author(s):  
Quan Zhou ◽  
Hang Shi ◽  
Chengpo Liu ◽  
Kerong Zhang ◽  
Quanfa Zhang ◽  
...  
Keyword(s):  
Larch Forest ◽  
Central China ◽  
Qinling Mountains ◽  
Disturbance History ◽  
Old Growth ◽  
North Central ◽  
History Of

Au-Ag-Te–RICH MELT INCLUSIONS IN HYDROTHERMAL GOLD-QUARTZ VEINS, XIAOQINLING LODE GOLD DISTRICT, CENTRAL CHINA

2021 ◽  
Author(s):  
Wei Jian ◽  
Jingwen Mao ◽  
Bernd Lehmann ◽  
Nigel J. Cook ◽  
Guiqing Xie ◽  
...  
Keyword(s):  
Melt Inclusions ◽  
Experimental Studies ◽  
Gold Deposits ◽  
Central China ◽  
Lode Gold ◽  
Quartz Veins ◽  
The North ◽  
Reduction Mechanisms ◽  
Adsorption Reduction ◽  
Lode Gold Deposits

Abstract We present petrographic and microthermometric evidence for precipitation of Au-Ag-Te–rich melt directly from hydrothermal fluids and subsequent entrapment as primary melt inclusions within pyrite from quartz veins of the Xiaoqinling lode gold district, southern margin of the North China craton. We propose the formation of Au-Ag-Te–rich melt through adsorption-reduction mechanisms on pyrite and subsequent growth of the melt nuclei via direct scavenging of metals from fluids. Because neither initial formation nor later growth of the melt require saturation of the ore fluid with respect to the constituent metals, this mechanism offers a new understanding of the enrichment of low-abundance ore components, such as gold. Our model may thus partly explain the discrepancy between the high gold solubilities reported from experimental studies and the much lower gold concentrations usually measured in natural fluids. This study also implies that Au-Ag-Te–rich melt has probably gone unrecognized in other lode gold deposits in which Au-Ag tellurides are present.

scholarly journals Fluvial terrace formation and its impacts on early human settlement in the Hanzhong basin, Qinling Mountains, central China

2019 ◽  
Vol 178 ◽  
pp. 1-14 ◽  
Author(s):  
Xun Yang ◽  
Xianyan Wang ◽  
Ronald T. Van Balen ◽  
Maarten A. Prins ◽  
Shejiang Wang ◽  
...  
Keyword(s):  
Central China ◽  
Qinling Mountains ◽  
Human Settlement ◽  
Fluvial Terrace ◽  
Early Human
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