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Evolution of a crustal-scale silicic to intermediate tectono-magmatic system: The ∼2600-2300 Ma Bundelkhand granitoid, India
Precambrian Research ( IF 4.427 ) Pub Date : 2020-10-16 , DOI: 10.1016/j.precamres.2020.105951
Sarajit Sensarma; Abdul Matin; Debajyoti Paul; Abhishek Kumar Madhesiya; Goutam Sarkar

Understanding the petrogenesis of crustal-scale silicic magmatic systems is a major research frontier. The ∼2600-2300 Ma granitoid covering >90% of the exposed part of the >26000 km2 Bundelkhand Craton in northcentral India is considered so far to have resulted from melting of Tonalite-Trondhjemite-Granitoid (TTG) gneiss at the mid-upper crustal level aided by radioactive heat generated from the U-enriched upper crustal rocks within a period of 60-80 Myr. Here we combine new field, petrographic / microstructural evidences, mineralogical and geochemical data, along with published geochemical/mineralogical, geochronological and geophysical results to develop a unified model that highlights the deeper crustal melting and crustal reworking mediated by repetitive mantle-derived mafic recharge over ≥300 Myr in a common specific stress regime that has controlled the evolution of Bundelkhand granitoid. Our main findings include: (a) Ti-in quartz, apatite and zircon saturation, and primary biotite thermometry indicating high liquidus (≥900°C) for the granitoid magma that crystallized over ∼200°C (∼≥900°-706°C); (b) magmatic epidote, amphibole (Fe-rich hastingsite to magnesiohornblende), and magmatic titanite indicate a polybaric crystallization of the ascending magma from the deeper crust (∼9 kb) through the middle (5-6 kb) to shallow crust (1-2 kb); (c) polybaric crystallization (≤5-10 kb) for mafic magma manifested in magmatic enclaves and mafic dyke swarms; (d) large-scale silicic-mafic magma interactions and (e) crystallization and emplacement of both silicic and mafic magma under a common stress regime. Unlike closed-system dehydration melting, the influx of mantle-derived supercritical basaltic magma provided not only heat and material but also supplied fluids in the deeper crust in a sustained tectono-magmatic condition. We conclude that the intermittent H2O-rich mafic recharge is key to large granitoid production in a dynamic crustal-scale magmatic system worldwide irrespective of tectonic setting.

更新日期:2020-10-17

 

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