The three l-type plutons of Guantian (GT), Guidong (GD), Shangbao (SB ) and the two S-typeplutons of Xucun (XC) and Xiuning (XN) as well as their microgranitoid enclaves in southern Chinahave been studied. Restite in ...The three l-type plutons of Guantian (GT), Guidong (GD), Shangbao (SB ) and the two S-typeplutons of Xucun (XC) and Xiuning (XN) as well as their microgranitoid enclaves in southern Chinahave been studied. Restite in the Motianling (MT) metasomatic granite in this area is described inthis paper as well. Microgranitoid enclaves in the I-type granitoids may be divided into autoliths andschlierens which have marked diffirences both in petrography and geochemistry. In the S-typegranitoids, schlierens are the major microgranitoid enclaves, but autoliths are rare. The metasomaticgranite contains only restite without other enclaves. The microgranitoid enclaves and their host rockshave close Nd (T) values and the same minerals within them are sirnilar in composition. Themicrogranitoid enclaves, in general, don’t represent the products of mjxing of the syn-plutonic foreignmafic magna and the host acidic magma. They are the reeords of the evolution of intermediate-acidicmagma itself The formation of autoliths is related to the interdiffosion of different conshtuents inmagma. Schlierens are the products of immiscible fractionation of the magma.展开更多
文摘The three l-type plutons of Guantian (GT), Guidong (GD), Shangbao (SB ) and the two S-typeplutons of Xucun (XC) and Xiuning (XN) as well as their microgranitoid enclaves in southern Chinahave been studied. Restite in the Motianling (MT) metasomatic granite in this area is described inthis paper as well. Microgranitoid enclaves in the I-type granitoids may be divided into autoliths andschlierens which have marked diffirences both in petrography and geochemistry. In the S-typegranitoids, schlierens are the major microgranitoid enclaves, but autoliths are rare. The metasomaticgranite contains only restite without other enclaves. The microgranitoid enclaves and their host rockshave close Nd (T) values and the same minerals within them are sirnilar in composition. Themicrogranitoid enclaves, in general, don’t represent the products of mjxing of the syn-plutonic foreignmafic magna and the host acidic magma. They are the reeords of the evolution of intermediate-acidicmagma itself The formation of autoliths is related to the interdiffosion of different conshtuents inmagma. Schlierens are the products of immiscible fractionation of the magma.
