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Petrogenesis and Ore Genesis of the Late Yanshanian Granites and Associated Porphyry-Skarn W-Mo Deposits from the Yunkai Area of South China： Evidence from the Zircon U-Pb Ages, Hf Isotopes and Sulfide S-Fe Isotopes

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Journal of Earth Science 2018年第4期29卷 939-959页

作者： Xinyu Wang Zhen Yang nengsong chen Rui Liu School of Earth Sciences China University of Geosciences Wuhan 430074 China Geological Prospecting Institute of Guangxi Zhuang Autonomous Region Nanning 530023 China Faculty of Earth Resources China University of Geosciences Wuhan 430074 China

There are a wide range of magmatism and mineralization in the Yunkai area of South China during the Late Yanshanian Period, including the newly discovered Michang, Youmapo, Sanchaehong and Songwang porphyry-skarn W-Mo deposits. In this study, we obtained zircon U-Pb ages of the ore-bearing biotite granites and their mafic enclaves from 884-1 to 1104-1 Ma. Zircons from the granites show Hf isotopic compositions with negative C-Hf（t） values of -5.9 to -0.6 and calculated Hf model ages （TvM2） of 1.5-1.2 Ga; indicating that the Middle Proterozoic crustal materials may have provided an important source for the magmatic rocks in this district during the Late Yanshanian Period, whereas zircons from the mafic enclaves show positive era（t） values of 1.3 to 10.1 with younger Hf model ages （TDM2） of 0.5-1.1 Ga, suggesting a mantle component may have involved in the granitic magma generation. Sulfur isotope study of the sulfide minerals from the W-Mo deposits show a narrow 834S distribution with most data ranging from -4.2%0 to 5.2‰. In addition, this study reports the first Fe isotopic compositions of pyrite in the W-Mo deposits, which show a uniform distribution range with the values near zero （656Fe=0.16‰-0.58‰, average 0.35‰; 657Fe=0.02‰-0.54‰, average 0.48‰）. These data indicate that the ore-forming materials may come from the deep-sourced granitic magma, and the mineralizations show a close relationship with the granitic magmatism during the Late Yanshanian Period. Combining with previous results, we suggest that there is a widespread porphyry-skarn W-Mo mineralization in the Yunkai area during the Late Cretaceous （80-110 Ma）, which has a close relationship with the Late Yanshanian magmatism that may have formed during the rollback of the subducted Pacific Plate.

关键词： zircon U-Pb age Hf isotopes S-Fe isotopes granitic magmatism Late Yanshanian Yunkai area.

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U-Pb dating of zircon from the Central Zone of the East Kunlun Orogen and its implications for tectonic evolution

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Science China Earth Sciences 2008年第7期51卷 929-938页

作者： chen nengsong SUN Min WANG QinYan ZHANG KeXin WAN YuSheng chen HaiHong Faculty of Earth Science China University of GeosciencesWuhan 430074China Department of Earth Sciences the University of Hong KongHong Kong SARChina Beijing SHRIMP Center Beijing 100037China State Key Laboratory of Geological Processes and Mineral Resources in China University of Geosciences Wuhan 430074China

LA-ICP-MS and SHRIMP U-Pb dating of zircons from orthogneisses and amphibolite from the Central Zone of the Kunlun Orogen is reported in this paper. One orthogneiss sample has metamorphic zircons yielding weighted average 206Pb/238U age of 517.0 +5.0/-6.0 Ma, and the other orthogneiss sample con- tains zircons with inherited magmatic cores giving three population 207Pb/206Pb ages of 955 Ma, 895 Ma and 657 Ma for the magmatic protolith, and metamorphic recrystallized rims with peak 206Pb/238U ages of 559 +12/?17 Ma and 516 ± 13 Ma. The amphibolite yielded three populations of weighted average 206Pb/238U age of 482.0 +10/?8.0 Ma, 516.2 ± 5.8 Ma and 549 ± 10 Ma for the metamorphic zircons. These dating results recorded the tectonothermal events that occurred in the early Paleozoic and the Pre- cambrian time. The records of the Cambrian magmatic-metamorphic event in the Qinling Orogen, the Altyn Tagh belt, north margin of the Qaidam Block and the Kunlun Orogen suggest that continental assembly probably occurred in the early evolutionary history of the Proto-Tethys.

关键词： zircon U-Pb dating East Kunlun Orogen Proto-Tethys tectonic evolution

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LA-ICPMS zircon U-Pb geochronological constraints onthe tectonothermal evolution of the Early Paleoproterozoic Dakendaban Group in the Quanji Block, NW China

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Chinese Science Bulletin 2008年第18期53卷 2849-2858页

作者： WANG QinYan chen nengsong LI XiaoYan HAO Shuang chen HaiHong Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China Tianjin Institute of Geology and Mineral Resources China Geological Survey Tianjin 300170 China State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Wuhan 430074 China

The Quanji Block, situated between the northern margin of the Qaidam Block and the South Qilian orogenic belt in the NE Qinghai-Tibet Plateau, China, is thought to represent a remnant continental crust. In this study, LA-ICPMS U-Pb analyses of detrital zircon grains from two mesosomes in the migmatitic Dakendaban Group yield ages of 2467+28/−26 Ma and 2474+66/−52 Ma, respectively. Zircon grains from a leucosome give two distinct ages of 2471+18/−16 Ma and 1924+14/−15 Ma. Zircon from a granitic pegmatite that intruded into the Dakendaban Group yields an age of 2427+44/−38 Ma. These data suggest that the Early Paleoproterozoic Dakendaban Group deposited between ∼2.43 to ∼2.47 Ga and has been subject to an intrusive event at 2.43 Ga, and regional metamorphism-anatexis at 1.92 Ga. The common lower intercept age of ∼0.9 Ga probably records a significant Early Neoproterozoic event in the Quanji Block.

关键词：地质学地质年代岩石青藏高原

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Zircon Hf Isotopes and Geochemistry of the Early Paleoproterozoic High-Sr Low-Y Quartz-Diorite in the Quanji Massif,NW China:Crustal Growth and Tectonic Implications

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Journal of Earth Science 2014年第1期25卷 74-86页

作者： Songlin Gong nengsong chen Hongyan Geng Min Sun Lu Zhang Qinyan Wang Three Gorges Geological Hazards Research Center Ministry of EducationChina University of Geosciences Faculty of Earth Sciences China University of Geosciences Department of Earth Sciences the University of Hong Kong

The metamorphosed Early Paleoproterozoic granitoids in the Quanji massif, Northwest- ern China provide constraints for relationship between the Tarim Craton and North China Craton. Among granitoids batholiths, rocks of the Mohe quartz-diorite show typically adakitic geochemical characteristics, with medium K2O/Na2O ratios （0.56-1.17） and high Sr （519-619 ppm） low Y （9.37-20.40 ppm） and Yb （0.97-1.77 ppm） concentrations. The rocks have εNd（t） values between ＋2.4 and ＋4.4 and depleted mantle Nd model ages of 2.43-2.59 Ga. The magmatic zircons have positive εHf（t） values ranging from ＋0.40 to ＋7.60 and depleted mantle Hf model ages of 2.43-2.70 Ga, with major peaks at -2.54 and -2.65 Ga. The geochemical and Nd-Hf isotopic characteristics indicate that the Mohe quartz-dioritic rocks might be formed by partial melting of high-pressure metamorphosed juve- nile crustal rocks in post-orogenic extensional regime in the Early Paleoproterozoic. It suggests that important crustal growth occurred in the Quanji massif and the Tarim Craton at -2.4 and 2.5-2.7 Ga. The Quanji massif and Tarim Craton might share a similar crustal evolution history with the North China Craton in the Neoarchean.

关键词： high-Sr and low-Y granitoid zircon Hf isotope crustal growth Quanji massif Tarim Craton North China Craton.

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EMP chemical ages of monazites from Central Zone of the eastern Kunlun Orogen:Records of multi-tectonometamorphic events

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Chinese Science Bulletin 2007年第16期52卷 2252-2263页

作者： chen nengsong SUN Min WANG QingYan ZHAO GuoChun chen Qiang SHU GuiMing Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China Department of Earth Sciences the University of Hong Kong Poflam Road Hong Kong China School of Earth and Space Sciences Peking University Beijing 100871 China

Two generations of monazite were identified in one mica schist sample from the central zone of the eastern Kunlun Orogen at the northern margin of the Qinghai-Tibet Plateau. The first generation was found in the cores of garnet porphyroblasts with relatively high Y2O3 contents (averaging 1.012±0.088 wt%). The second generation occurs either as inclusions in the rims of garnet porphyroblasts,matrix kyanite,plagioclase and quartz,or as separate crystals associated with matrix biotite and muscovite mostly having a relatively low Y2O3 content (averaging 0.479±0.100 wt%). Electron microprobe (EMP) Th-U-Pbtotal chemical dating for two grains of the first generation monazite yields average ages of 455 ± 18 Ma and 420 ± 20 Ma,respectively; six grains of the second generation gave an average age of 246.1 ± 3.8 Ma. These ages suggest that the core and rim of the garnet porphyroblasts and their associated assemblages record two events of significant tectonometamorphism. The formation of the Ordovician monazite is related to the tectonometamorphic event responsible for continuous amalgamation of the Gondwanaland in the Late Pan-African period or for consumption of the Proto-Tethys,whereas the development of the Triassic monazite is related to the tectonometamorphic event for consumption of the Paleo-Tethys.

关键词：独居石昆仑造山带变质岩电子探针测年石榴石

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Precise timing of the Early Paleozoic metamorphism and thrust deformation in the Eastern Kunlun Orogen

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Chinese Science Bulletin 2002年第13期47卷 1130-1133页

作者： chen nengsong SUN Min HE Lei ZHANG Kexin WANG Guocan Faculty of Earth Sciences China University of GeosciencesWuhan 430074China Department of Earth Sciences The University of Hong KongHong KongChina

In Dulan County, Qinghai Province NW China, the arc volcanic sequences in the northern side of the Central Fault of the East Kunlun were metamorphosed progressively from upper greenschist facies in the south to epidote-amphibolite facies in the north. High-angle thrust deformation was developed synchronously with the peak metamor-phim and superimposed with later low-angle striking-slip deformation. Zircon U-Pb dating yields a concordant age of (448±4) Ma for the metavolcanics. Syn-kinematic hornblende and muscovite separated from the high-angle thrusting belt give 40Ar-39Ar plateau age of (427±4) Ma and 408 Ma, respectively. These results precisely constrain the timing of the closure of early Paleozoic volcanic basin (Proto-Tethys) over the eastern portion of the East Kunlun Orogen, and the thrust tectonic slice had a cool rate of ca. 9°C/Ma.

关键词： East Kunlun Mountains metamorphic and deformation event geochronology.

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Electron microprobe chemical ages of monazite from Qinling Group in the Qinling Orogen: Evidence for Late Pan-African metamorphism?

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Chinese Science Bulletin 2006年第21期51卷 2645-2650页

作者： chen Qiang chen nengsong WANG Qinyan SUN Min WANG Xinyu LI Xiaoyan SHU Guiming Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China Department of Earth Sciences The University of Hong Kong HongKong SAR China Guangxi Institute of Geological Survey Nanning 5300.23 China School of Earth and Space Sciences Peking University Beijing 100871 China

Electron microprobe chemical dating was carried out on monazites enclosed in two gen-erations of mineral paragenesis of St + Ky + Grt and Sil + And + Grt + St, respectively, from the Qinling Group. Two different ages, 520±23 Ma and 435±9 Ma, were obtained from these monazites. This indicates that the Qinling Group experienced a metamorphism during the Early Cambrian, which is probably in response to the Late Pan-African subduction-accretion tectonothermal event.

关键词：化学年龄电子显微探针独居石秦岭造山带

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New paleontological evidence on time determination of the east part of the Eastern Kunlun Mélange and its tectonic significance

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Science China Earth Sciences 2004年第10期47卷 865-873页

作者： ZHANG Kexin LIN Qixiang ZHU Yunhai YIN Hongfu LUO Mansheng chen nengsong WANG Guocan Faculty of Earth Science China University of Geosciences Wuhan 430074 China Faculty of Earth Science China University of Geosciences Wuhan 430074 China Faculty of Earth Science China University of Geosciences Wuhan 430074 China Faculty of Earth Science China University of Geosciences Wuhan 430074 China Faculty of Earth Science China University of Geosciences Wuhan 430074 China Faculty of Earth Science China University of Geosciences Wuhan 430074 China Faculty of Earth Science China University of Geosciences Wuhan 430074 China

New paleontological evidence suggests that the composition of the matrix and slices from the middle and the south of the Eastern Kunlun Mélange Belt is very complex, ranging from Proterozoic to Mesozoic in geological time. A Cambrian acritarch assemblage has been discovered from the middle part of the Eastern Kunlun Mélange, a Neoproterozoic to the early Paleozoic acritarch assemblage has been discovered from the south of the Eastern Kunlun Mé lange, and so has been an Early Permian radiolarian from the A’nyemaqen Mélange in Buqing- shan. In addition, some sporopollen has been obtained from the Mesozoic tectonic slices. The above-mentioned paleontological evidence indicates that the Eastern Kunlun Orogenic Belt experienced two episodes from ocean to continent from the Neoproterozoic to the Early Paleo- zoic and in the Late Paleozoic respectively. In the process of intracontinent development in Mesozoic, because of heavy thrust-nappe, strike-slip sheer and crust shortening, the Mesozoic formation was intercalated in mélange by slices and the Eastern Kunlun Orogenic Belt became more complex.

关键词： Eastern Kunlun Melange Belt, paleobio-assemblage, time determination, geotectonic evolution.

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Geochemistry of Metamafic Dykes from the Quanji Massif: Petrogenesis and Further Evidence for Oceanic Subduction, Late Paleoproterozoic, NW China

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Journal of Earth Science 2016年第4期27卷 529-544页

作者： Hassan Abdelslam Mustafa Qinyan Wang nengsong chen Fanxi Liao Min Sun Meshaal Abdelgadir Salih Faculty of Earth Sciences China University of Geosciences Faculty of Science University of Kordofan Center for Global Tectonics China University of GeosciencesWuhan State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Department of Earth Sciences The University of Hong Kong

A suite of ~1.84-1.92 Ga metamafic dykes within the paragneiss suite（khondalite） of the Quanji massif in NW China, has been chosen in this study for further understanding the tectonic evolution and possible links to the global Columbia supercontinent. Occurrence and field relations suggest that they were formed coevally with a previous studied ~1.83-1.85 Ga metamafic dyke swarms. Whole-rock major and trace elemental geochemistry suggests precursor magma of the amphibolites being generated from a volcanic arc-related tectonic setting rather than a back-arc environment where the metamafic dyke swarms were emplaced. The metamafic dykes show enrichment of LREE and strongly negative anomalies for Ta-Nb, Zr-Hf and Ti, have high SiO_2（49.3 wt.%-52.5 wt.%） but low MgO（6.40 wt.%-7.76 wt.%） contents and Mg~#（Mg~#=[100×（MgO/40.3）]/[MgO/40.3＋FeO/71.8]） values（45.7-52.1）, suggesting evolved precursor magma. The high values of La/Ta（22.2-42.8） and La/Nb（1.71-2.47）, mildly negative εNd（t） values（-2.51-0.15）, with depleted mantle model ages（TDM） of 2.45-2.84 Ga, suggest that their precursor magmas were possibly derived from a subduction-related fluid metasomatized Archean sub-continental lithospheric mantle. This study provides further evidence for oceanic plate subduction prevailing before or around ~1.85 Ga, which confirms a prolonged subduction-accretion-collision history in the NW China which is possibly linked to the assembly of the Columbia supercontinent.

关键词： metamafic dyke geochemistry petrogenesis tectonic setting Quanji massif NW China.

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Early Paleoproterozoic Post-Collisional Basaltic Magmatism in Quanji Massif:Implications for Precambrian Plate Tectonic Regime in NW China

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Journal of Earth Science 2022年第3期33卷 706-718页

作者： Hassan Abdelslam Mustafa Fanxi Liao nengsong chen Zhendong You Meshaal Abdelgadir Salih Lu Wang Lu Zhang School of Earth Sciences China University of GeosciencesWuhan 430074China Faculty of Science University of KordofanEL ObeidP.O.160Sudan International Research Center for Geology and Resources along the Silk Roads China University of GeosciencesWuhan 430074China College of Earth Sciences University of Science and Technology of ChengduChengdu 610059China State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesWuhan 430074China

Basaltic magmas can provide important information about mantle source nature,tectonic settings and tectonic evolution for a given *** paper reports geology,petrography and geochemistry of whole-rock major and trace elements and Nd-Sr isotopes for a suite of garnet amphibolites from southeastern Wulan(Ulan),Quanji Massif,northwestern *** garnet amphibolites were likely generated from basaltic lavas,associated with both paragneisses and orthogneisses of the lower Delingha *** basaltic protolith of these amphibolites can be broadly constrained to be formed at~2.33 Ga in an extensional setting *** geochemistry of amphibolites shows subalkaline and highly evolved *** display high-Fe low-Ti characteristics,with TFeO of 13.1 wt.%-17.9 wt.%and TiO_(2) of 1.42 wt.%-3.09 wt.%(in most samples TiO_(2)≤2.5 wt.%).The chondrite-normalized REE patterns show enrichment of LREE and LILE and the primitive-mantle-normalized incompatible element patterns display negative P,Ti,Nb-Ta and Zr-Hf ***(^(87)Sr/^(86)Sr)t values of 0.6978-0.7123 andε_(Nd)(t)values of-2.81-5.08 respond to depleted mantle model ages(T_(DM))of 2.33-3.30 *** suggest that the precursor magmas of the protolith of the garnet amphibolites were probably derived from the Early Paleoproterozoic depleted sub-continental lithospheric mantle that had been metasomatized by subduction-induced fluids and *** precursor basaltic magmas were contaminated by the older crustal components during magma *** post-collisional basaltic magmatic event at~2.33 Ga in Quanji Massif thus enhanced the subduction shutdown or slowdown tectonic regime both in NW China and coevally with those plate tectonics in some important domains worldwide during the Early Paleoproterozoic.

关键词： amphibolite geochemistry NW China post-collisional magmatism Precambrian tectonic evolution

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