scholarly journals Sm–Nd Isochron Age Constraints of Au and Sb Mineralization in Southwestern Guizhou Province, China

Minerals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 100
Author(s):  
Zepeng Wang ◽  
Qinping Tan ◽  
Yong Xia ◽  
Jianzhong Liu ◽  
Chengfu Yang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Guizhou Province ◽  
Nd Isotope ◽  
Tectonic Environment ◽  
Southwestern Guizhou ◽  
Extensional Tectonic ◽  
Southwestern Guizhou Province ◽  
Age Range ◽  
New Evidence ◽  
Age Constraints

Southwestern Guizhou, China, is famous for hosting clusters of Carlin-type Au, Sb, and Hg-Tl deposits. These deposits are thought to be the products of a low-temperature hydrothermal metallogenic event. Calcite and fluorite are common and widespread gangue minerals in Au and Sb deposits, respectively. Ore-related calcite commonly coexists with stibnite, realgar, and orpiment at the periphery of high-grade orebodies in Au deposits, while ore-related fluorite is generally intergrown with stibnite in Sb deposits. In this study, ore-related calcite and fluorite samples from representative Au (Zimudang) and Sb (Dachang) deposits, respectively, were separated, and the rare earth element (REE) concentrations, Sm/Nd isotope ratios, and Sm–Nd isochron ages were analyzed. This study aims to determine the formation ages of the calcite and fluorite and to constrain the age of low-temperature metallogenic event in Southwestern Guizhou. The calcite and fluorite samples contain relatively high total concentrations of REEs (8.21–22.5 μg/g for calcite, 21.7–36.6 μg/g for fluorite), exhibit variable Sm/Nd ratios (0.51–1.01 for calcite, 0.35–0.49 for fluorite), and yield Sm–Nd isochron ages of 148.4 ± 4.8 and 141 ± 20 Ma, respectively. These ages are consistent with the age range constrained by the low-temperature thermochronology of zircon (132–160 Ma), crosscutting relationships of stratigraphy or intrusions (96–160 Ma), and previous dating results (135–150 Ma) in Southwestern Guizhou. Collectively, the ages obtained in this study add new evidence to previous geochronology studies, such that the low-temperature hydrothermal mineralization in Southwestern Guizhou can be constrained to 135–150 Ma, corresponding to the Yanshanian orogeny, which was associated with a weak extensional tectonic environment.

Contribution to the knowledge of the cavernicolous beetle genus Aspidaphaenops Uéno from Guizhou (Coleoptera: Carabidae: Trechinae)

Zootaxa ◽  
2018 ◽  
Vol 4422 (2) ◽  
pp. 244 ◽  
Author(s):  
MINGYI TIAN ◽  
SUNBIN HUANG
Keyword(s):  
New Species ◽  
Southwest China ◽  
Ground Beetle ◽  
Guizhou Province ◽  
New Information ◽  
Southwestern Guizhou ◽  
Two New Species ◽  
Southwestern Guizhou Province ◽  
Male Genital

The hypogean ground beetle genus Aspidaphaenops Uéno, 2006 is reviewed. Some new information of A. reflexus Uéno, 2006 is provided, including the male genital characteristics as well as a new locality. Two new species are described and illustrated from southwestern Guizhou Province, southwest China: A. xiongda n. sp. (Guizhou: Anlong: Fengyan Dong), A. dudou n. sp. (Guizhou: Xingyi: Xiaozi Dong). A key to all Aspidaphaenops species is also provided. 

Geochemistry, zircon ages and whole-rock Nd isotopic systematics for Palaeoproterozoic A-type granitoids in the northern part of the Delhi belt, Rajasthan, NW India: implications for late Palaeoproterozoic crustal evolution of the Aravalli craton

2006 ◽  
Vol 144 (2) ◽  
pp. 361-378 ◽  
Author(s):  
PARAMPREET KAUR ◽  
NAVEEN CHAUDHRI ◽  
INGRID RACZEK ◽  
ALFRED KRÖNER ◽  
ALBRECHT W. HOFMANN
Keyword(s):  
Source Region ◽  
Magma Source ◽  
Crustal Evolution ◽  
Nd Isotope ◽  
Tectonic Environment ◽  
Granulite Metamorphism ◽  
Extensional Tectonic ◽  
Aravalli Craton ◽  
Isotope Systematics

Determination of zircon ages as well as geochemical and Sm–Nd isotope systematics of granitoids in the Khetri Copper Belt of the Aravalli mountains, NW India, constrain the late Palaeoproterozoic crustal evolution of the Aravalli craton. The plutons are typical A-type within-plate granites, derived from melts generated in an extensional tectonic environment. They display REE and multi-element patterns characterized by steep LREE-enriched and almost flat HREE profiles and distinct negative anomalies for Sr, P and Ti. Initial εNd values range from −1.3 to −6.2 and correspond to crustal sources with mean crustal residence ages of 2.5 to 2.1 Ga. A lower mafic crustal anatectic origin is envisaged for these granitoids, and the heterogeneous εNd(t) values are inferred to have been acquired from the magma source region. Zircon Pb–Pb evaporation and U–Pb ages indicate widespread rift-related A-type magmatism at 1711–1660 Ma in the northern Delhi belt and also suggest a discrete older magmatic event at around 1800 Ma. The emplacement ages of the compositionally distinct A-type granitoid plutons, and virtually coeval granulite metamorphism and exhumation in another segment of the Aravalli mountains, further signify that part of the Aravalli crust evolved during a widespread extensional event in late Palaeoproterozoic time.

scholarly journals Iron Isotope Constraints on the Mineralization Process of Shazi Sc-Rich Laterite Deposit in Qinglong County, China

Minerals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 737
Author(s):  
Jun Sun ◽  
Yunlong Liu ◽  
Xiqiang Liu
Keyword(s):  
Large Scale ◽  
Isotope Composition ◽  
Guizhou Province ◽  
Iron Isotope ◽  
Fe Content ◽  
Southwestern Guizhou ◽  
Southwestern Guizhou Province ◽  
Hydrolysis Of ◽  
Range Of Variation

The Shazi deposit is a newly discovered, potential large-scale scandium deposit located in Qinglong, southwestern Guizhou Province, China. The iron isotopic composition of magnetite in fresh basalt, weathered basalt, and mineralized laterite was investigated. The Fe content of fresh basalt and of weathered basalt vary from 15.41 wt.% to 15.51 wt.% and from 14.60 wt.% to 15.12 wt.%, respectively, while the δ56Fe of magnetite varies from 0.23‰ to 0.29‰ and from 0.02‰ to 0.07‰. Laterite has the highest Fe content, in the range of 23.53%~28.95%, but δ56Fe is similar to weathered basalt, and the range of variation is −0.09‰–0.03‰. The change in iron isotope composition in weathered basalt and laterite is related to the hydrolysis of clinopyroxene. Combined with the existing research results, the genesis of scandium deposit is considered to be related to in situ hydrolysis in deep and surface weathering leaching of Emeishan basalt.

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