[an error occurred while processing this directive] Global Geology 2017, 20(4) 217-228 DOI:   10.3969/j.issn.1673-9736.2017.04.04  ISSN: 1673-9736 CN: 22-1371/P
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Nangnimsan
diorite
U-Pb geochronology
geochemistry
extension environment
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YIN Yue
WANG Li
SUN Xia
JIANG Hefang
LI Liang
PubMed
Article by Yin Y
Article by Wang L
Article by Sun X
Article by Jiang H
Article by Li L
U-Pb geochronology, geochemistry and tectonic implications ofdiorite from Nangnimsan of Mehe in northern Da Hinggan Mountains
YIN Yue1, WANG Li1, SUN Xia2, JIANG Hefang1, LI Liang1
1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. Bureau of Land and Resources of Laizhou City, Shandong Province, Laizhou 261400, Shandong, China
ժҪ�� LA-ICP-MS zircon U-Pb dating indicates that the weighted average age of diorite from Nangnimsan, Mohe in the northern Da Hinggan Mountains in Heilongjiang Province is 516.2±1.7 Ma, as a result of magmatic intrusion of Early Cambrian. Geochemistry analysis indicates that the rocks belong to high-K calc-alkaline series, with low content of SiO2 (52.24%-53.64%) and high Mg (MgO=5.67%-6.56%, Mg#=61.05-65.46). The rocks are characterized by the enrichment of LREE and LILE (e.g. Rb, Ba, Pb), and relative depletion in HREE and HFSE (e.g. Ta, Nb, P, Ti), and with a high content of Sr (442.3-622.3)×10-6, Yb (2.49-3.42)×10-6 and Y (25.64-35.49)×10-6, and slightly negative Eu anormaly (δEu=0.60-0.81). Based on Rb/Sr (0.15-0.25) and Rb/Nb (8.27-15.12), it is concluded that the primary magma of diorite was derived from the mixture of the crust and mantle. Combined with background of regional tectonic evolution, it is suggested that diorite was formed in the extensional environment after the collage of the EGM with the Siberian.
�ؼ����� Nangnimsan   diorite   U-Pb geochronology   geochemistry   extension environment  
U-Pb geochronology, geochemistry and tectonic implications ofdiorite from Nangnimsan of Mehe in northern Da Hinggan Mountains
YIN Yue1, WANG Li1, SUN Xia2, JIANG Hefang1, LI Liang1
1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. Bureau of Land and Resources of Laizhou City, Shandong Province, Laizhou 261400, Shandong, China
Abstract: LA-ICP-MS zircon U-Pb dating indicates that the weighted average age of diorite from Nangnimsan, Mohe in the northern Da Hinggan Mountains in Heilongjiang Province is 516.2±1.7 Ma, as a result of magmatic intrusion of Early Cambrian. Geochemistry analysis indicates that the rocks belong to high-K calc-alkaline series, with low content of SiO2 (52.24%-53.64%) and high Mg (MgO=5.67%-6.56%, Mg#=61.05-65.46). The rocks are characterized by the enrichment of LREE and LILE (e.g. Rb, Ba, Pb), and relative depletion in HREE and HFSE (e.g. Ta, Nb, P, Ti), and with a high content of Sr (442.3-622.3)×10-6, Yb (2.49-3.42)×10-6 and Y (25.64-35.49)×10-6, and slightly negative Eu anormaly (δEu=0.60-0.81). Based on Rb/Sr (0.15-0.25) and Rb/Nb (8.27-15.12), it is concluded that the primary magma of diorite was derived from the mixture of the crust and mantle. Combined with background of regional tectonic evolution, it is suggested that diorite was formed in the extensional environment after the collage of the EGM with the Siberian.
Keywords: Nangnimsan   diorite   U-Pb geochronology   geochemistry   extension environment  
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DOI: 10.3969/j.issn.1673-9736.2017.04.04
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