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Geochemical Characteristics of Granitoids of the Erdenet Porphyry Copper Deposit, Mongolia
Author(s) -
Morozumi Haruhisa
Publication year - 2003
Publication title -
resource geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.597
H-Index - 43
eISSN - 1751-3928
pISSN - 1344-1698
DOI - 10.1111/j.1751-3928.2003.tb00180.x
Subject(s) - hypogene , mineralization (soil science) , geology , geochemistry , porphyry copper deposit , copper , mineralogy , fluid inclusions , pyrite , chemistry , quartz , soil science , paleontology , sphalerite , soil water , organic chemistry
. The Erdenet porphyry copper deposit is one of the major mineral deposits in Mongolia. The geochemical data of granitoids acquired for the Erdenet and its surrounding areas are re‐examined. The granitoids of the Erdenet deposit with hypogene type mineralization show the lowest TiO 2 content. Although Ti was possibly lost through the pyritization, it is also possible that the hypogene type mineralization occurred accompanied with the most differentiated granitoids. The variation of the element contents related to the mineralization of the Erdenet deposit shows the decrease of MgO and CaO contents, rather constant K 2 O content, rather constant to decrease of Na 2 O content, with respect to the Cu contents. The rather constant Na 2 O in the mineralized zone is owing to the residual albite against the sericitic alteration. The granitoids of the Erdenet area show an increase of Na 2 O content and a decrease of K 2 O content with an increase of SiO 2 content. This trend makes clear contrast to granitoids in the surrounding areas. The granitoids of the Erdenet area might have the adakitic nature based on the Sr and Y contents.