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| 1 | Early Paleozoic adakite in the Liuyuan area from the Beishan orogenic belt,NW Gansu Province:Petrogenesis and implication for tectonic setting显示文摘The Liuyuan area,which is located on the southern margin of the Beishan orogenic belt,develops abundant Early Paleozic granitoids.SHRIMP zircon U-Pb dating yielded a weighted mean 206Pb/238U age of 421±8 Ma for the Liuyuan granodiorite(Zhao Zehui et al.,2007),implying its Late Silurian intrusion.Geochemical compositions showed that the Liuyuan granodiorite is characterized by high SiO2(65.01%-67.31%),A12O3(17.17%-18.05%) and Na2O(Na2O/K2O=1.67-1.87) but low Mg# contents calculated as 100×Mg2+/(Mg2++∑Fe2+) from 28.77 to 31.15,as well as being enriched in Sr(472×10-6-517×10-6) but depleted in Yb(1.2×10-6-1.42×10-6) and Y(12.8×10-6-14×10-6).The REEs are characterized by right-inclined patterns with LREE enrichment,HREE depletion and slightly negative Eu anomalies(Eu/Eu*=0.91-0.97).Major and trace elements indicate that the granodiorite is an adakite.The Nb/Ta values of the granodiorite vary from 10.80 to 18.01 and Nb/U from 6.32 to 10.09,both lying between the values of the crust and the mantle.The rock has low εNd(t) values(-2.5--0.8) and high ISr(0.706321-0.706495).Geochemical and Sr-Nd isotopic compositions indicate that the Liuyuan granodiorite is possibly derived from partial melting of thickening lower crust,related to mantle underplating.The Yb-Ta and Y+Nb-Rb discriminant diagrams imply the Liuyuan granodiorite intruded in a local extensional tectonic setting during late collision.Combined with previous studies on geochronology,geochemistry and tectonic setting of granitoids,we interprete that the constraint of this adakite in the Liuyuan area indicates that the tectonic setting may have transformed from collision to extension during the Early Devonian. | Li, Yanjun Wei, Junhao Tan, Jun Fu, Lebing Liu, Xuntao Kong, Lingjun Jiang, Yongjian Shi, Wenjie | 2011 | Chinese Journal Of Geochemistry2011，30，2： | 2 |
| 2 | The relationship between gold mineralization, exhumation of metamorphic core complex and magma cooling: Formation of the Anjiayingzi Au deposit, northern North China Craton显示文摘 | Lebing Fu Junhao Wei Huayong Chen Leon Bagas Jun Tan Huan Li Daohan Zhang Ning Tian | 2014 | Ore Geology Reviews2014，，： | 1 |
| 3 | Crustal architecture and metallogeny associated with the Paleo-Tethys evolution in the Eastern Kunlun Orogenic Belt,Northern Tibetan Plateau显示文摘The Eastern Kunlun Orogenic Belt(EKOB)in the Northern Tibet Plateau hosts a wide variety of metal deposits related to the Late Paleozoic to Mesozoic magmatism.In this study,we investigate the spatiotemporal distribution of the Late Paleozoic to Mesozoic granitic rocks and associated metal deposits in the EKOB and provide a comprehensive compilation of the geochronological,geochemical and isotopic data on these rocks.We compute regional zircon Hf isotope and crustal thickness maps from the data,based on which a comprehensive model is proposed involving subduction(ca.270–240 Ma),continental collision(ca.240–224 Ma),and post-collisional extension(ca.224–200 Ma)for the Late Paleozoic to Mesozoic Paleo-Tethys evolution in the EKOB.Zircon Hf isotopic and crustal thickness mapping of Late Paleozoic to Mesozoic magmatic rocks was carried out to evaluate their spatio-temporal and genetic links with the regional metallogeny.The polymetallic Fe-skarn and porphyry Cu(Mo)deposits in the EKOB are located above the Moho uplift region,featuring a comparatively thin crust.Granites associated with porphyry Cu(Mo)and polymetallic Fe skarn mineralization are commonly characterized by highε_(Hf)(t)and younger T_(DM)cvalues,whereas granite related to Cu-Mo-Sn skarn deposits exhibit more variableε_(Hf)(t)values,T_(DM)c ages,and the crust thickness,which suggest that more crustal materials contributed to the formation of Cu-Mo-Sn skarn deposits than those for porphyry Cu(Mo)and polymetallic Fe skarn mineralization.In contrast,vein-type Au deposits are located primarily where the Moho surface displays a depression,i.e.,where the continental crust is relatively thick.The magmatic rocks associated with Au mineralization are characterized by lowε_(Hf)(t)and high T_(DM)cvalues,representing reworked ancient crustal components,similar to those associated with porphyry Mo and epithermal Ag-Pb-Zn-(Au)deposits.Our study indicates that the emplacement of magmatic-hydrothermal deposits was controlled by the crustal structure and magma sources. | Xinming Zhang Xu Zhao Lebing Fu Yanjun Li Andreas Kamradt M.Santosh Chongwen Xu Xiaokun Huang Gregor Borg Junhao Wei | 2023 | Geoscience Frontiers2023，14，6： | 0 |
| 4 | LA-ICP-MS zircon U-Pb dating of the Kunlunguan A-type granites in Guangxi Province,South China and its geological significance显示文摘The Kunlunguan biotite granite pluton, located in the southwestern part of the Nanling Mesozoic granite belt, is controlled by the NW-trending Nandan-Kunlunguan deep fault. LA-ICP-MS zircon U-Pb dating yielded a weighted mean 206Pb/238U age of 93.0±1 Ma (MSDW=1.7) for the main part of the pluton, implying its Late Creta-ceous intrusion. The Kunlunguan body is a high-K calc-alkaline rock characterized by high silicon, alkali and alu-minum, and low phosphorus and titanium. SiO2 contents of the Kunlunguan body range from 68.13% to 72.61% and K2O/Na2O ratios from 1.28 to 1.87. A/CNK values vary from 0.76 to 1.42, indicating a metaluminous to intensively peraluminous character. The rocks are enriched in Ga, Rb, Th, U and Pb but depleted in Ba, Nb, Sr, P and Ti. The REEs are characterized by remarkable negative Eu anomalies (Eu/Eu*=0.53-0.73) and exhibit right-inclined 'V'-shaped patterns with LREE enrichment. Petrology, major and trace elements data all indicate that the pluton is aluminous A-type granite which intruded in a post-collisional extensional tectonic setting. It is related to back-arc extension, reflecting high-angle subduction of the paleo-Pacific plate, caused by northward movement of the Indian plate. The Nandan-Kunlunguan A-type granites belt, together with similar plutons in the coastal areas of Zhejiang and Fujian provinces, represent the two A-type granite belts under a matching tectonic system. | FU Lebing WEI Junhao LI Yanjun TAN Jun LI Shuiru LI Hongmei | 2010 | Chinese Journal Of Geochemistry2010，29，3： | 0 |
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