TY - JOUR
T1 - Overheated, Cu-bearing magmas in Zaldivar Porphyry Copper Deposit, Northern Chile: Geodinamic evidence
AU - drs Campos, E.
AU - Touret, J.L.R.
AU - Nikogosian, I.
AU - Delgado, J.
AU - Morales, P.
PY - 2002
Y1 - 2002
N2 - The Zaldivar porphyry copper deposit, Northern Chile, consists of two major intrusions, the 290 Ma Zaldivar, and the more recent Miocene (38.7 Ma) Llamo porphyry. Five types of inclusions have been identified in quartz phenocrysts from Llamo porphyry, including melt inclusions (M), and four types of fluid inclusions, called MS (multi solids), B (brines), G (vapor-rich) and W (aqueous), respectively. Melt remnants, well preserved as M-inclusions, homogenize around 1000 °C. They show a rhyolitic composition, comparable to the most evolved acidic rhyolitic end member found elsewhere in the regional magmatism and to worldwide volcanic rhyolitic glass. High silica content in some inclusions can, however, be due to partial remelting of the quartz host during the heating run. Cooper content in the same inclusions ranges between 0.03 and 0.57 wt.%, with an average concentration of 0.10 wt.%, suggesting a major magmatic source for the copper (orthomagmatic model). MS inclusions, which contain a number of solids at room temperature, mostly H
AB - The Zaldivar porphyry copper deposit, Northern Chile, consists of two major intrusions, the 290 Ma Zaldivar, and the more recent Miocene (38.7 Ma) Llamo porphyry. Five types of inclusions have been identified in quartz phenocrysts from Llamo porphyry, including melt inclusions (M), and four types of fluid inclusions, called MS (multi solids), B (brines), G (vapor-rich) and W (aqueous), respectively. Melt remnants, well preserved as M-inclusions, homogenize around 1000 °C. They show a rhyolitic composition, comparable to the most evolved acidic rhyolitic end member found elsewhere in the regional magmatism and to worldwide volcanic rhyolitic glass. High silica content in some inclusions can, however, be due to partial remelting of the quartz host during the heating run. Cooper content in the same inclusions ranges between 0.03 and 0.57 wt.%, with an average concentration of 0.10 wt.%, suggesting a major magmatic source for the copper (orthomagmatic model). MS inclusions, which contain a number of solids at room temperature, mostly H
U2 - 10.1016/S0040-1951(01)00215-3
DO - 10.1016/S0040-1951(01)00215-3
M3 - Article
SN - 0040-1951
VL - 345
SP - 229
EP - 251
JO - Tectonophysics
JF - Tectonophysics
ER -