TY - JOUR
T1 - Geology, geochemistry, and geochronology of the Wangjiazhuang porphyry-breccia Cu(-Mo) deposit in the Zouping volcanic basin, eastern North China Block
AU - Wang, Hao
AU - Fu, Bin
AU - Xu, Zhaowen
AU - Lu, Xiancai
AU - Lu, Jianjun
AU - Li, Haiyong
AU - Qu, Wenjun
AU - Yang, Xiaonan
AU - Chen, Wei
AU - Zhang, Jun
N1 - Publisher Copyright:
© 2014 Elsevier B.V.
PY - 2015
Y1 - 2015
N2 - The Wangjiazhuang porphyry-breccia Cu(-Mo) deposit is located in the Zouping volcanic basin, western Shandong Province. Seven molybdenite samples yield a Re-Os weighted mean age of 127.8±0.7Ma (2σ), which is identical within error to the zircon weighted mean 206Pb/238U age of 128.3±1.3Ma (2σ) determined for quartz monzonite samples. The host rock is characterized by high concentrations of K2O (4.26-4.53wt.%), Na2O (4.97-5.76wt.%), LILEs and LREEs, and high Mg# (>40), and low concentrations of HFSEs and HREEs, with K2O/Na2O ratios of 0.76-0.88. The quartz monzonite also has high Sr/Y (69.9-112.5) and (La/Yb)N (22.0-30.0) ratios, similar to adakitic rocks worldwide. Relatively low initial 87Sr/86Sr ratios (0.70549-0.70556), high εNd(t) values (2.58-3.06), high radiogenic Pb [(206Pb/204Pb)i=18.3424-18.4606, (207Pb/204Pb)i=15.5692-15.5985, (208Pb/204Pb)i=38.1714-38.2734] and high zircon εHf(t) values (-2.1 to +4.3) indicate that the magma was likely derived from the partial melting of subducted oceanic crust which then reacted with the peridotitic mantle wedge. Both the breccia and porphyry ores have a narrow range of δ34S (-4.8 to +2.1‰) and Pb isotopic compositions (206Pb/204Pb=18.295-18.402, 207Pb/204Pb=15.551-15.573, and 208Pb/204Pb=38.215-38.331), suggesting that the ore metals were extracted primarily from the quartz monzonite or similar source. Subduction of the Paleo-Pacific slab during the Early Cretaceous resulted in the formation of the Wangjiazhuang quartz monzonite and associated Cu(-Mo) deposit in western Shandong Province.
AB - The Wangjiazhuang porphyry-breccia Cu(-Mo) deposit is located in the Zouping volcanic basin, western Shandong Province. Seven molybdenite samples yield a Re-Os weighted mean age of 127.8±0.7Ma (2σ), which is identical within error to the zircon weighted mean 206Pb/238U age of 128.3±1.3Ma (2σ) determined for quartz monzonite samples. The host rock is characterized by high concentrations of K2O (4.26-4.53wt.%), Na2O (4.97-5.76wt.%), LILEs and LREEs, and high Mg# (>40), and low concentrations of HFSEs and HREEs, with K2O/Na2O ratios of 0.76-0.88. The quartz monzonite also has high Sr/Y (69.9-112.5) and (La/Yb)N (22.0-30.0) ratios, similar to adakitic rocks worldwide. Relatively low initial 87Sr/86Sr ratios (0.70549-0.70556), high εNd(t) values (2.58-3.06), high radiogenic Pb [(206Pb/204Pb)i=18.3424-18.4606, (207Pb/204Pb)i=15.5692-15.5985, (208Pb/204Pb)i=38.1714-38.2734] and high zircon εHf(t) values (-2.1 to +4.3) indicate that the magma was likely derived from the partial melting of subducted oceanic crust which then reacted with the peridotitic mantle wedge. Both the breccia and porphyry ores have a narrow range of δ34S (-4.8 to +2.1‰) and Pb isotopic compositions (206Pb/204Pb=18.295-18.402, 207Pb/204Pb=15.551-15.573, and 208Pb/204Pb=38.215-38.331), suggesting that the ore metals were extracted primarily from the quartz monzonite or similar source. Subduction of the Paleo-Pacific slab during the Early Cretaceous resulted in the formation of the Wangjiazhuang quartz monzonite and associated Cu(-Mo) deposit in western Shandong Province.
KW - Geochemistry
KW - Geochronology
KW - Isotopes
KW - North China Block
KW - Porphyry-breccia Cu(-Mo) deposit
UR - http://www.scopus.com/inward/record.url?scp=84926144941&partnerID=8YFLogxK
U2 - 10.1016/j.oregeorev.2014.12.010
DO - 10.1016/j.oregeorev.2014.12.010
M3 - Article
SN - 0169-1368
VL - 67
SP - 336
EP - 353
JO - Ore Geology Reviews
JF - Ore Geology Reviews
ER -