Fluid inclusion, geochemical, Rb–Sr and Sm–Nd isotope studies on tungsten mineralized Degana and Balda granites of the Aravalli craton, NW India

Journal of earth system science

S Balakrishnan^1¹  M S Pandian^1²  Sundarrajan Vijay Anand^1,2³ 

[1] AMD for Exploration and Research, Nagarbhavi, Bengaluru 560 072, India.^3;Department of Earth Sciences, Eritrea Institute of Technology, Asmara 126 76, Eritrea.^2;Department of Earth Sciences, Pondicherry University, Kalapet, Puducherry 605 014, India.^1

关键词: Neoproterozoic W deposit;    Degana and Balda granites;    fluid inclusion;    geochronology;    Aravalli craton;    Rodinia;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

Granitic plutons occurring within and to the west of the Delhi Fold Belt in the Aravalli craton, northwestern India are the result of widespread felsic magmatism during Neoproterozoic, some of which are associated with greisen and skarn tungsten deposits. In this paper, we present the result of our study on fluid inclusions, geochemistry and geochronology of two such tungsten mineralized granite plutons at Degana and Balda, and interpret the nature of ore fluid, and petrogenesis and age of these mineralized granites. Fluid inclusion study reveals coexistence of moderate and hyper-saline aqueous fluid inclusions along with aqueous-carbonic inclusions, suggesting their origin due to liquid immiscibilityduring fluid–rock interaction. Geochemically, the granites are peraluminous, Rb enriched, Sr and Ba depleted and highly differentiated. The Rb–Sr isotopic systematics yielded 795±11 Ma for Balda granite and 827 ± 8 Ma for Degana granite. We show that major phase of widespread granitoid magmatismand mineralization during the Neoproterozoic (840–790 Ma) in NW India is coeval with breakup of the Rodinia supercontinent and infer a causal relationship between them.

【 授权许可】

CC BY