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Pyrochlore Chemistry from the Bonga Carbonatite‐type Nb Deposit, Huila Province, Angola: Implications for Magmatic‐Hydrothermal Processes of Carbonatite.
Author(s) -
ZHENG Luo,
GU Xuexiang,
ZHANG Yongmei
Publication year - 2014
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12373_34
Subject(s) - carbonatite , pyrochlore , hydrothermal circulation , geochemistry , geology , chemistry , paleontology , mantle (geology) , organic chemistry , phase (matter)
Pyrochlore-group minerals are the most important Nbbearing minerals (Chakhmouradian and Williams, 2004) that are produced mainly from carbonatite. Many researchers have done numerous studies of pyrochlore geochemistry in different carbonatite worldwide, which helps to better understand the magmatic, hydrothermal and low-temperature (supergene) evolution of carbonatite (Nasraoui and Bilai, 2000). Bonga carbonatite Nb deposit with an estimated reserve of 824 Mt grading 0.48% Nb2O5 (Kamitani and Hirano, 1990), is located in the west side of Lucapa Early Cretaceous rift in western Angola. Only a few researchers have worked on the of carbonatite and pyrochlore in this deposit (Issa Filho et al, 1991; Coltorti et al., 1993; Bambi et al., 2012). Furthermore, the research on pyrochlore is limited in primary (magmatic) pyrochlore. In this abstract, we provide new geochemical (EMPA) data of pyrochlore from the Bonga carbonatite.