Petrology and geochemistry of the Grubergebirge anorthosite and marginal rocks,central Dronning Maud Land: Further characterization of the Late Neoproterozoic magmatic event in East Antarctica |
| |
| Authors: | Vadlamani Ravikant A Dharwadkar P R Golani R Ravindra |
| |
| Institution: | 1.Geochronology & Isotope Geology Division,Geological Survey of India,Kolkata,India;2.Antarctica Division,Geological Survey of India, NH-5P, NIT,Faridabad,India;3.Airborne Mineral and Surveys and Exploration Wing, WR,Geological Survey of India,Jhalana Dungri, Jaipur,India;4.National Centre for Antarctic and Ocean Research,Headland Sada, Vasco-da-Gama, Goa,India |
| |
| Abstract: | The Grubergebirge anorthosite, a Late Neoproterozoic massif-type anorthosite, was emplaced into Late Mesoproterozoic-aged
metamorphosed orthogneisses and supracrustal rocks in the Wohlthat Mountains. Mineralogically and chemically, the marginal
rocks to the anorthosite massif classify as ferromonzodiorite and ferromonzonite. Variations in trace and rare earth element
abundances and normalized patterns between the anorthosite and associated marginal ferromonzodiorite (and minor ferromonzonite)
and distinct differences between the ferromonzodiorite and ferromonzonite have been observed. Whereas the magmas from which
the anorthosite crystallized have been slightly contaminated by incorporating crustal material (now occurring as enclaves),
the marginal ferromonzodiorite represent rocks that originated due to mixing (hybridization) of injected primitive ferrodiorite
magma(s) with preexisting crustal material, resulting in the hybrid ferromonzodiorite. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
