Geochemical characteristics of fluorine- and chlorine-bearing biotite from Tusham Ring Complex, NW India: Constraints on halogen distribution and geodynamic evolution

摘要

The present study is carried out to understand the factors controlling halogens present in biotites, role of halogens in metallogeny in context to the magmatic evolution of Tusham Ring Complex (TRC), NW Indian Shield. The investigated rocks are identified with hypersolvus, high-K calc-alkaline, peraluminous, ferroan-enriched and typical A-type granitoids affinity. They are enriched in SiO$_{2}$, Na$_{2}$O?+?K$_{2}$O, REEs (except Eu), LILE?+?HFSE, elevated in Fe/Mg, Ga/Al, Th/U, A/CNK ratio and depleted in CaO, MgO, Sr, Cr, Ni, P, Ti, V and Eu abundances. The sequential accumulation of incompatible trace elements (LILE, HFSE, REEs and others) in studied rocks overlaps almost entirely the range of rare metal granitoids and high heat-producing granitoids. The elemental geochemistry in conjunction with high abundances of F (0.80–7.11 wt%) and Cl (0.44–1.56 wt%) in biotite mineral collectively attribute to hydrothermal fluid activity and the subsequent mineralization around TRC region. Our new results suggest that the acidic magmatism that occurred in the TRC is considered as a part of the plume-related Neoproterozoic Malani Igneous Suite (MIS) anorogenic magmatism. $f{Highlights}$ $ullet$ The bulk geochemistry data and the high concentration of fluorine (0.80–7.11 wt%) and chlorine (0.44–1.56 wt %) in biotite mineral indicate halogen enriched magmatic source. $ullet$ The halogen enriched magma is an important key to understand the magmatic evolution and metallogeny of Tusham Ring Complex. $ullet$ The high concentration of rare metal, rare earth metals and radioactive elements suggests that the investigated granitoids are rare metal granitoids with high heat producing capacity. $ullet$ The acid volcano-plutonic rocks of Tusham Ring Complex are important barcodes to reconstruct the Neoproterozoic Rodinia supercontinent and related tecto-magmatic activities occurred in NW Indian shield.