Metamorphism of the El Trapiche - La Carolina area, San Luis province, Argentina.

MOGESSIE, A; HAUZENBERGER, CH; HOINKES, G; FELFERNIG, A; BJERG, E A; KOSTADINOFF, J

Rio de Janeiro

Congreso; 31st International Geological Congress; 2000

The hills of La Huerta and Valle Fertil, wich belong to the Western Pampean Ranges in the Province of San Juan, NW Argentina, mainly consist of metagabboic to metadioritic rocks that intruded the Proterozoic basement in the Early Middle Ordovician (Famat <!-- /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> The El Trapiche - La Carolina area belongs to the Sierras Pampeanas, of Central Argentina. The Paleozoic crystalline basement consists of greenschist, amphibolite and granulite facies rocks, mafic-ultramafic bodies, metagranites, and pegamatites. Greenschist facies rocks, phyllites, were metamorphosed at temperatures of about 400°C. Most of the crystalline basement consists of amphibolite facies rocks with staurolite - garnet - biotite - muscovite - plagioclase - quartz -ilmenite + fibrolite f chlorite mineral assemblages.