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| 1 | Zircon U-Pb geochronology and geochemistry of Early Cretaceous granodiorite porphyries in Hutouya,western Shandong and their implications for petrogenesis显示文摘Zircon LA-ICP-MS U-Pb age and whole-rock geochemistry data are presented for the Hutouya granodiorite porphyries in Mengyin,western Shandong,to restrict its petrogenesis.The analyzed zircons exhibit oscillatory growth zoning and core-rim textures in the cathodoluminescence images and have high Th/U ratios( 0.04--1.66),indicating its magmatic origin.The youngest group of magmatic zircon yields weighted mean^(206)Pb/^(238) U age of 132 ± 2 Ma,which represents the forming age of the granodiorite porphyries,i.e.,the Early Cretaceous.The oldest group of magmatic zircon^(207)Pb/^(206) Pb ages ranges from 2 398 Ma to 2 370 Ma,yielding a weighted mean age of 2 389 ± 23 Ma,suggesting that the basement of the North China Craton should exist in the research area.Geochemically,the samples are characterized by high Si O_2( 70.38% and 64.87%),low Mg O( 0.60% and 1.53%) and Mg~#values( 42.92 and 50.42).Moreover,they show enrichment of light rare earth elements and large ion lithophile elements( e.g.Rb,Ba and K),depletion of heavy rare earth elements and high field strength elements( e.g.Nb and Ta),positive anomaly of Pb,and negative anomaly of Ti.These results,together with previously published data,indicate that the Hutouya granodiorite porphyries were derived from partial melting of a delaminated lower continental crust and subsequent interaction with the mantle peridotites.They are consistent with the period of lithospheric thinning beneath the eastern North China Craton and may be formed in an extensional tectonic environment. | YANG Haotian SHI Jiangpeng YANG Debin | 2017 | Global Geology2017，20，1： | 2 |
| 2 | Geochronology and geochemistry of Dongxigao diorite porphyries: implications for Late Neoarchean tectonic evolution of eastern North China Craton显示文摘Zircon LA-ICP-MS U-Pb age and whole-rock geochemistry data are presented for the Dongxigao diorite porphyries in Pingyi,western Shandong,to restrict its petrogenesis. The zircons from the Dongxigao diorite porphyries exhibit striped absorption and oscillatory growth zoning in the cathodoluminescence images,which have upward-type characteristics of rare earth elements( REEs) with positive anomaly of Ce and negative anomaly of Eu,and have high Th / U ratios( 0. 06--0. 91),indicating its magma origin. Zircon LA-ICP-MS UPb dating indicates that^(207) Pb /^(206) Pb ages of 16 spots of zircons are between 2476 Ma and 2701 Ma,yielding a weighted mean age of 2 481 ± 8 Ma,which represents the formation age of Dongxigao diorite porphyries,i. e.Late Neoarchaean. Geochemically,the samples have low contents of SiO_2( 54. 94% and 54. 86%) and high amounts of MgO( 7. 19% and 7. 58%) and Mg~#values( 66. 47 and 67. 59). Additionally,the Dongxigao diorite porphyries show enrichment of LREEs and prominent negative Eu anomaly( δEu = 0. 89 and 0. 91),and they are characterized by enrichment of large ion lithophile elements( LILEs)( e. g. Cs,Rb and Ba),depletion of high field strength elements( HFSEs)( e. g. Nb,Ta,Zr,Hf and Ti),and positive anomaly of K and Pb. The results imply that the Dongxigao diorite porphyries dominantly derived from partial melting of enriched lithospheric mantle with attributes of arc magma,and the magma source area was mixed with amounts of continental crust material,it suggests that they formed in transformation tectonic setting changing from compression to intraplate extension. | SHI Jiangpeng YANG Haotian HUO tengfei YANG Donghong | 2016 | Global Geology2016，19，2： | 0 |
| 3 | Petrogenesis of Paleoproterozoic diorite porphyries inLuojiazhuang, western Shandong: constraints fromLA-ICP-MS zircon U-Pb geochronology and geochemistry显示文摘Based on the study of LA-ICP-MS zircon U-Pb geochronology and whole-rock geochemistry for theLuojiazhuang diorite porphyries in Menying , western Shandong , the analyzed zircons exhibit oscillatory zoning in the cathodoluminescence images and have high Th/U ratios (0. 15-1.53) , indicating a magmatic origin.In addition, most of the zircons have narrow metamorphic edges, suggesting that late metamorphic eventsmay exist. The youngest group of magmatic zircon 207Pb/206Pb ages rangng from 2 384 Ma to 2 234 Ma, yieldinga weighted mean age of 2 353 ± 14 Ma, which represents the forming age of the diorite porphyries, as theEarly Paleoproterozoic. Geochemically , the samples are characterized by low Si〇2(54. 54% and 55. 47% ),high MgO (5.22% and 5.49% ) and Mg# values (58 and 59) . Moreover , they show enrichment of light rareearth elements and large ion lithophile elements ( Rb , Ba and K) , depletion of heavy rare earth elements andhigh field strength elements (Nb, Ta , Zr and Hf) , positive anomaly of Pb , and negative anomaly of Ti. Thefact implies that the Luojiazhuang diorite porphyries might derive from partial melting of mantle and mixed with an amount of continental crust material. In summary , they may tectonic setting that stretching along the east-"west direction at the North China Craton in the Early Paleoproterozoic. | YANG Haotian SHI Jiangpeng HUO tengfei YANG Donghong | 2016 | Global Geology2016，19，2： | 0 |
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