The Characteristics of Fluid Inclusions in Sphalerite of Dengfuxian Granite-related Tungsten Deposit, SE China

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Geochemical Characteristics of Trace Element of Calcite，Quartz of the No. 510-1 Uranium Ore Deposit in Zoige

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The Probability Density Function Related to Shallow Cumulus Entrainment Rate and Its Influencing Factors in a Large-Eddy Simulation

The process of entrainment-mixing between cumulus clouds and the ambient air is important for the development of cumulus clouds. Accurately obtaining the entrainment rate(λ) is particularly important for its parameterization within the overall cumulus parameterization scheme. In this study, an improved bulk-plume method is proposed by solving the equations of two conserved variables simultaneously to calculate λ of cumulus clouds in a large-eddy simulation. The results demonstrate that the impro...     

Spatiotemporal variations in remote sensing phenology of vegetation and its responses to temperature change of boreal forest in tundrataiga transitional zone in the Eastern Siberia

Phenology is an important indicator of climate change. Studying spatiotemporal variations in remote sensing phenology of vegetation can provide a basis for further analysis of global climate change. Based on time series data of MODIS-NDVI from 2000 to 2017, we extracted and analyzed four remote sensing phenological parameters of vegetation, including the Start of Season(SOS), the End of Season(EOS), the Middle of Season(MOS) and the Length of Season(LOS), in tundra-taiga transitional zone in the...     

Geochemical Characteristics of Granite from the Zhuxi Copper-Tungsten Polymetallic Deposit in Jingdezhen Region, Jiangxi Province

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Thermal History of the Naruo Porphyry Deposit in the Duolong Ore District, Western Tibet: Evidence from U-Pb, 40Ar/39Ar and (U-Th)/He Thermochronology

The Naruo porphyry copper deposit containing more than 2 Mt of copper is located in the Duolong ore district in the west of the Bangongco–Nujiang belt in central Tibet. New zircon U-Pb, biotite 40Ar/39Ar, zircon (U-Th)/He ages, published age data together with thermal modeling were presented in this paper to investigate the thermal history of Naruo deposit. Thermal modeling reveals a prolonged magmatic-hydrothermal evolution firstly cooling from ~700°C to ~350°C at 120 Ma, then cooling to 230°C at 106 Ma and maintaining at 200°C from 106 to 90 Ma which is attributed to multiple magmatic events and thermal effect of strike-slip fault. Affected by thrust nappe structure, the sample was consistent with 120°C from 70 to 63 Ma. The Naruo deposit started to experience exhumation at a rate of ~0.07 km/Myr since 60 Ma which is related to India-Asia collision. The prolonged magmatic-hydrothermal evolution process might have important influence on the Naruo deposit. The ore-related intrusions preserved in the foot walls of strike-slip fault and thrust nappe structure are the objects of future exploration in the Duolong ore district.     

Mineralizing Fluid Origins and Sulfur Isotope Variations of Tangzhangzi Au-polymetallic Deposit at Eastern Hebei

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Geochronology and Geochemistry of the Mamupu Cu-Au Polymetallic Deposit, Eastern Tibet: Implications for Eocene Cu Metallogenesis in the Yulong Porphyry Copper Belt

The Mamupu skarn-type Cu-Au polymetallic deposit represents the first discovery of a medium deposit in the southern Yulong porphyry copper belt (YPCB), eastern Tibet. The Cu-Au mineralization mainly occurs as chalcopyrite in breccia, within the plate-like carbonate interlayer, being closely related to chloritization (e.g., chlorite, magnetite and epidote) and skarnization (e.g., diopside, tremolite and garnet). The ore-related quartz syenite porphyry (QSP) and granodiorite porphyry (GP) were emplaced at 40.1 ± 0.2 Ma and 39.9 ± 0.3 Ma, respectively. The QSP of Mamupu is an alkaline-rich intrusion, relatively enriched in LREE, LILE, depleted in HFSE, with no significant negative Eu and Ce anomalies, slightly high (87Sr/86Sr)i, low εNd(t), uniform (206Pb/204Pb)i and εHf(t) values, which indicates that the porphyry magma may be caused by both the mixing of metasomatized EM II enriched mantle and thickened juvenile lower crust. The QSP in the Mamupu deposit shares a similar genesis of petrology to other ore-related porphyries within the YPCB. High oxygen fugacity and water content of the magmas are essential for the formation of porphyry and skarn Cu deposits. The QSP has similar high magmatic oxidation states and water content to the Yulong deposit, which indicates that the Mamupu has a high prospecting potential. Differences in the geological characteristics and scale of mineralization between the Mamupu and other YPCB deposits may be due to the different emplacement depths of ore-related intrusions, as well as differences in the surrounding rocks.