[an error occurred while processing this directive] Global Geology 2018, 21(3) 166-176 DOI:   10.3969/j.issn.1673-9736.2018.03.02  ISSN: 1673-9736 CN: 22-1371/P
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Khanka Massif
Early Cretaceous
hornblende gabbro
zircon U-Pb geochronology
geochemistry
petrogenesis
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PubMed
Petrogenesis of Early Cretaceous hornblende gabbro in Khanka Massif: evidence from geochronology and geochemistry
WEI Chunxia, WEI Xu, ZHU Weigang, XU Wenliang
College of Earth Sciences, Jilin University, Changchun 130061, China
ժҪ�� The authors report zircon U-Pb geochronological, whole-rock geochemical and zircon Lu-Hf isotope data for the hornblende gabbro within the Khanka Massif, with the aim of constraining its formation time and petrogenesis. The zircon U-Pb dating shows that 206Pb/238Pb ages of zircons from the hornblende gabbro range from 120 to 129 Ma, yielding a weighted mean age of 123±2 Ma, i.e., the Early Cretaceous. The hornblende gabbro has SiO2 of 44.77%-46.58% and belongs to the tholeiitic series on FeOt/MgO-SiO2 diagram. It displays a right-inclined REE pattern with (La/Yb)N ratios of 3.44 to 4.42. The trace element spidergram shows that they are enriched in large ion lithophile elements (LILE) such as Rb, Th, U, K and Pb, and depleted in high field strength elements (HFSE) such as Nb, Ta, Ti and P, indicating an affinity to arc igneous rocks. The εHf(t) values of zircons vary from -2.6 to +3.9 and Hf model ages (TDM1) range from 622 to 883 Ma. These geochemical characteristics indicate that primary magma of the hornblende gabbro could be derived from partial melting of young mantle material accreted during the Neoproterozoic. Combined with the Early Cretaceous igneous rock assemblages in NE Asia. It is concluded that the hornblende gabbro formed in an active continental margin related to the westward subduction of the Paleo-Pacific Plate beneath the Khanka Massif.
�ؼ����� Khanka Massif   Early Cretaceous   hornblende gabbro   zircon U-Pb geochronology   geochemistry   petrogenesis  
Petrogenesis of Early Cretaceous hornblende gabbro in Khanka Massif: evidence from geochronology and geochemistry
WEI Chunxia, WEI Xu, ZHU Weigang, XU Wenliang
College of Earth Sciences, Jilin University, Changchun 130061, China
Abstract: The authors report zircon U-Pb geochronological, whole-rock geochemical and zircon Lu-Hf isotope data for the hornblende gabbro within the Khanka Massif, with the aim of constraining its formation time and petrogenesis. The zircon U-Pb dating shows that 206Pb/238Pb ages of zircons from the hornblende gabbro range from 120 to 129 Ma, yielding a weighted mean age of 123±2 Ma, i.e., the Early Cretaceous. The hornblende gabbro has SiO2 of 44.77%-46.58% and belongs to the tholeiitic series on FeOt/MgO-SiO2 diagram. It displays a right-inclined REE pattern with (La/Yb)N ratios of 3.44 to 4.42. The trace element spidergram shows that they are enriched in large ion lithophile elements (LILE) such as Rb, Th, U, K and Pb, and depleted in high field strength elements (HFSE) such as Nb, Ta, Ti and P, indicating an affinity to arc igneous rocks. The εHf(t) values of zircons vary from -2.6 to +3.9 and Hf model ages (TDM1) range from 622 to 883 Ma. These geochemical characteristics indicate that primary magma of the hornblende gabbro could be derived from partial melting of young mantle material accreted during the Neoproterozoic. Combined with the Early Cretaceous igneous rock assemblages in NE Asia. It is concluded that the hornblende gabbro formed in an active continental margin related to the westward subduction of the Paleo-Pacific Plate beneath the Khanka Massif.
Keywords: Khanka Massif   Early Cretaceous   hornblende gabbro   zircon U-Pb geochronology   geochemistry   petrogenesis  
�ո����� 2018-07-24 �޻����� 2018-08-14 ����淢������  
DOI: 10.3969/j.issn.1673-9736.2018.03.02
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Supported by National Natural Science Foundation of China (No.41330206).

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