Pb Isotopic Geochemistry of Carbonate-Hosted Pb-Zn Deposits, NW Guizhou Pb-Zn Metallogenic District, China

2012 ◽  
Vol 524-527 ◽  
pp. 160-165
Author(s):  
Sui Hai Chen ◽  
He Ming Cheng ◽  
Tian Chun He
Keyword(s):  
Carbonate Rocks ◽  
Pb Isotopes ◽  
Metallogenic Province ◽  
Isotopic Compositions ◽  
Basement Rocks ◽  
Isotopic Geochemistry

The NW Guizhou Pb-Zn metallogenic district is an important part of the Yunnan – Sichuan - Guizhou Pb-Zn metallogenic province (SYG), and also is one of the important Pb-Zn producers in China. We analyzed the Pb isotopic compositions of sulfides, hosting rocks and basement rocks, the results show that the206Pb/204Pb,207Pb/204Pb, and208Pb/204Pb ratios of sulfides range from 18.029 to 19.900, 15.357 to 17.716 and 38.004 to 40.695, respectively. The206Pb/204Pb,207Pb/204Pb and208Pb/204Pb ratios of hosting rocks and basement rocks range from 18.397 to 19.483, 15.545 to 16.700 and 38.204 to 39.140, respectively. This indicates that the compositions of Pb isotopes of sulfides are basically consistent with that of hosting rocks and basement rocks, so the metals were sourced from various strata of carbonate rocks and underlying rocks.

scholarly journals Supplemental Material: First-cycle sand supply and the evolution of the eastern Canadian continental margin: Insights from Pb isotopes in the Mesozoic Scotian Basin

2020 ◽  
Author(s):  
Aoife Blowick ◽  
et al.
Keyword(s):  
Statistical Analysis ◽  
Continental Margin ◽  
Pb Isotopes ◽  
Isotopic Compositions ◽  
Sand Supply

S1: Statistical Analysis of Pb isotopes in K-feldspar; S2: Pb isotopic compositions of K-feldspars; S3: Thorogenic Pb Plots.

Geology, fluid inclusions, C–O–S–Pb isotopes and genesis of the Ahangaran Pb-Ag (Zn) deposit, Malayer-Esfahan Metallogenic Province, western Iran

2020 ◽  
Vol 195 ◽  
pp. 104339
Author(s):  
Mohammad Maanijou ◽  
Ebrahim Tale Fazel ◽  
Sobhan Hayati ◽  
Hassan Mohseni ◽  
Masoumeh Vafaei
Keyword(s):  
Fluid Inclusions ◽  
Pb Isotopes ◽  
Metallogenic Province ◽  
Western Iran

Sulfur and Lead Isotopic Geochemistry of the Shidi Pb-Zn Deposit in Xiushan County, Chongqing

2013 ◽  
Vol 842 ◽  
pp. 180-186
Author(s):  
Xiao Jun Xiang ◽  
Yan Shuang ◽  
Kui Gong
Keyword(s):  
Sulfate Reduction ◽  
Sulfide Minerals ◽  
Black Shales ◽  
Upper Crust ◽  
Average Value ◽  
Isotopic Compositions ◽  
Isotopic Geochemistry ◽  
Marine Carbonates ◽  
Niutitang Formation

The Shidi Pb-Zn deposit is located in Xiushan County, southern Chongqing, and its orebodies were hosted in marine carbonates of the Cambrian Pingjing Formation. The authors selected sulfide minerals from the deposit for the analysis of sulfur and lead isotopic compositions. Theδ34S values of sulfide minerals vary from 10.8 to 15.6, with an average value of 13.52, indicating these sulfide materials were mainly derived from marine sulfate reduction. The 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb ratios for sulfide minerals vary within the ranges of 18.319~18.422, 15.740~15.784 and 38.355~38.511, respectively. In the diagrams of Zartman, the Pb isotopic compositions of sulfide minerals fall into the regional upper crust lead zone. According to the characteristics of sulfur and lead isotopic compositions of the Shidi Pb-Zn deposit, the ore-forming materials might have come from the black shales of the Lower Cmabrian Niutitang Formation.

Nature des sources des composants andesitiques des Gres du Champsaur et des Gres de Taveyannaz; implications dans l'evolution des Alpes occidentales au Paleogene

2001 ◽  
Vol 172 (4) ◽  
pp. 487-501 ◽  
Author(s):  
Maud Boyet ◽  
Henriette Lapierre ◽  
Marc Tardy ◽  
Delphine Bosch ◽  
Rene Maury
Keyword(s):  
Trace Element ◽  
Western Alps ◽  
Northern Italy ◽  
Calc Alkaline ◽  
Magmatic Source ◽  
Isotopic Compositions ◽  
Alpine Zone ◽  
Internal Zone ◽  
Isotopic Geochemistry

Abstract Paleogene magmatism is widespread in the western Alps and its origin is still a matter of debate. It consists of calc-alkaline and shoshonitic suites with mainly granodioritic intrusions in the Internal Zone (northern Italy), andesitic volcanism in the Delphino-Helvetic Zone (French-Swiss domain) and the Esterellite intrusions in Provence. In the External Alpine Zone, the Taveyannaz Sandstones and the Champsaur Sandstones preserve andesitic pebbles and mineral fragments dated at 32 Ma. On the basis of trace-element and isotopic geochemistry (Sr, Nd, Pb and O) of mineral separates (amphibole, pyroxene and plagioclase) and andesitic clasts, we characterise the nature of magmatic source(s) and compare the isotopic compositions of the andesites with those of well known Paleogene igneous suites.

scholarly journals Sr isotopic characteristics in two small watersheds draining silicate and carbonate rocks: implication for studies on seawater Sr isotopic evolution

2014 ◽  
Vol 18 (2) ◽  
pp. 559-573
Author(s):  
W. H. Wu ◽  
H. B. Zheng ◽  
J. H. Cao ◽  
J. D. Yang
Keyword(s):  
River Water ◽  
Carbonate Rocks ◽  
Chemical Weathering ◽  
Silicate Weathering ◽  
86Sr Ratio ◽  
Weathering Rates ◽  
Isotopic Compositions ◽  
Small Watersheds ◽  
Isotopic Evolution ◽  
The Pearl River

Abstract. We systematically investigated the Sr isotopic characteristics of a small silicate watershed, the Xishui River a tributary of the Yangtze River, and a small carbonate watershed, the Guijiang River a tributary of the Pearl River. The results show that the two rivers have uncommon Sr isotopic characteristics compared with most small watersheds. Specifically, the silicate watershed (Xishui River) has relatively high Sr concentrations (0.468 to 1.70 μmol L−1 in summer and 1.30 to 3.17 μmol L−1 in winter, respectively) and low 87Sr/86Sr ratios (0.708686 to 0.709148 in summer and 0.708515 to 0.709305 in winter). The carbonate watershed (Guijiang River) has low Sr concentrations (0.124 to 1.098 μmol L−1) and high 87Sr/86Sr ratios (0.710558 to 0.724605). As the 87Sr/86Sr ratios in the Xishui River are lower than those in seawater, the 87Sr/86Sr ratio of seawater will decrease after the river water is transported to the oceans. Previous studies have also shown that some basaltic watersheds with extremely high chemical weathering rates reduced the seawater Sr isotope ratios. In other words, river catchments with high silicate weathering rates do not certainly transport highly radiogenic Sr into oceans. Therefore, the use of the variations in the seawater 87Sr/86Sr ratio to indicate the continental silicate weathering intensity may be questionable. In the Guijiang River catchment, the 87Sr/86Sr ratios of carbonate rocks and other sources (rainwater, domestic and industrial waste water, and agricultural fertilizer) are lower than 0.71. In comparison, some non-carbonate components, such as sand rocks, mud rocks, and shales, have relatively high Sr isotopic compositions. Moreover, granites accounted for only 5% of the drainage area have extremely high 87Sr/86Sr ratios with an average of greater than 0.8. Therefore, a few silicate components in carbonate rocks obviously increase the Sr isotopic compositions of the river water.

Sr-Nd-Pb Isotopic Geochemistry of the Hukeng Granite Body in Jiangxi Province, South China

2013 ◽  
Vol 353-356 ◽  
pp. 1187-1190
Author(s):  
Jun Liu ◽  
Zhen Xiu Liao ◽  
Ying Chen ◽  
Yong Zhan ◽  
You Fei Guan
Keyword(s):  
South China ◽  
Crustal Contamination ◽  
Pb Isotopes ◽  
Jiangxi Province ◽  
Granite Body ◽  
Isotopic Geochemistry

The Mesozoic Hukeng granite body locates in southeast limb of Wugongshan compound anticline in Jiangxi Province, South China. This study uses samples from the Hukeng granite body to determine the characteristics of Sr-Nd-Pb isotopes and source of the granite body. The rocks have 87Sr/86Sr ratios as high as 0.84112, suggesting that crustal contamination existed there. The rocks have higher ratios of 87Rb/86Sr, 87Sr/86Sr and (87Sr/86Sr)i, and lower ratios of 147Sm/144Nd, 43Nd/144Nd and lower εNd(t), indicating that the Hukeng granite body possessesEMⅡ-like characteristics. Combined with Pb isotopic values (206Pb/204Pb ratios from 18.5313 to 18.8460, 207Pb/204Pb ratios from 15.6562 to 15.6782 and 208Pb/204Pb ratios from 38.7015 to 38.7565), the Hukeng granite body originated from EMⅡ and suffered crustal contamination in certain extent.

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