RT Journal Article
T1 Chlorite geothermometry applied to massive and oscillatory-zoned radiated Mn-rich chlorites in the Patricia Zn-Pb-Ag epithermal deposit (NE, Chile)
A1 Chinchilla, Darío
A1 Arroyo Rey, Xabier
A1 Merinero Palomares, Raúl
A1 Piña García, Rubén
A1 Nieto, Fernando
AB Two textural types of chlorite are identified in the mineralised veins at the Patricia Zn-Pb-Ag epithermal ore deposit (NE, Chile): massive and oscillatory-zoned adiated chlorites. Three main stages of mineralisation have been defined in the Patricia deposit: (1) pre-ore stage, (2) base-metal stage which is divided into two substages: substage 2a and substage 2b and (3) post-ore stage. Both types of chlorite are classified as chamosite and occur coeval to the sphalerite precipitation during the substage 2a. Massive chlorite shows an average content of 33 wt.% FeO, 4.9 wt.% MnO, and 4 wt.% MgO. Oscillatory zoning in radiated chlorites consists of concentric bands with different contents on FeO (from 26.45 to 41.41 wt.%), MgO (from 1.7 to 5.44 wt.%) and MnO (from 1.7 to 9.32 wt.%). Four different chlorite geothermometers based on the system SiO2-Al2O3-FeO-MgO-H2O were applied to both types of chlorites. The temperature estimations are in agreement with temperatures data of fluid inclusions previously measured in sphalerite of the sub-stage 2a. Despite the high content in Mn of chlorites, the study confirms the applicability of the chlorite geothermometers without the knowledge of the Fe3+/Fe ratio in low-pressure paragenesis and its usefulness as an important tool for characterising the thermal conditions in epithermal ore deposits.
PB Elsevier
SN 0169-1317
YR 2016
FD 2016
LK https://hdl.handle.net/20.500.14352/23622
UL https://hdl.handle.net/20.500.14352/23622
LA eng
NO Ministerio de Economía y Competitividad (MINECO)
DS Docta Complutense
RD 26 mar 2026