TY - JOUR
T1 - Chemistry, origin, and evolution of mineralized granites in the Lachlan Fold Belt, Australia
T2 - the metallogeny of I- and S-type granites
AU - Blevin, P. L.
AU - Chappell, B. W.
PY - 1995
Y1 - 1995
N2 - Granites crop out over 20% of the total exposed area of the Lachlan fold belt and comprise subequal proportions of I and S types. Major Sn mineralization is related to S- and I-type granites that are both reduced and have undergone extended feldspar-dominated crystal fractionation. Mo showings are common but, as for Cu, large deposits are absent. Scheelite skarn mineralization is represented by the major King Island deposits; however, granite related W mineralization of a similar scale is not found elsewhere within the belt. The ore element ratios (Sn/W/Cu/Mo, etc.) of granite-related mineralization in the Lachlan fold belt is a straightforward function of the relative oxidation state and degree of fractionation within the associated granite suites. The progression from Cu-Au, and W to Mo mineralization related to progressively more fractionated, oxidized I-type magmas can be traced within single supersuites. Such a systematic relationship between magma composition, redox state, and ore element ratios is good evidence for the magmatic source of ore elements in granite-related mineral deposits and for the production of the observed ore element ratios dominantly through magmatic processes. -from Authors
AB - Granites crop out over 20% of the total exposed area of the Lachlan fold belt and comprise subequal proportions of I and S types. Major Sn mineralization is related to S- and I-type granites that are both reduced and have undergone extended feldspar-dominated crystal fractionation. Mo showings are common but, as for Cu, large deposits are absent. Scheelite skarn mineralization is represented by the major King Island deposits; however, granite related W mineralization of a similar scale is not found elsewhere within the belt. The ore element ratios (Sn/W/Cu/Mo, etc.) of granite-related mineralization in the Lachlan fold belt is a straightforward function of the relative oxidation state and degree of fractionation within the associated granite suites. The progression from Cu-Au, and W to Mo mineralization related to progressively more fractionated, oxidized I-type magmas can be traced within single supersuites. Such a systematic relationship between magma composition, redox state, and ore element ratios is good evidence for the magmatic source of ore elements in granite-related mineral deposits and for the production of the observed ore element ratios dominantly through magmatic processes. -from Authors
UR - http://www.scopus.com/inward/record.url?scp=0029479278&partnerID=8YFLogxK
U2 - 10.2113/gsecongeo.90.6.1604
DO - 10.2113/gsecongeo.90.6.1604
M3 - Article
AN - SCOPUS:0029479278
SN - 0361-0128
VL - 90
SP - 1604
EP - 1619
JO - Economic Geology
JF - Economic Geology
IS - 6
ER -