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Provenance of Conglomerate and Sandstone from Early Permian Shoushangou Formation in Xi Ujimqin,Inner Mongolia:Implications for Understanding Paleo-Asian Ocean Subduction

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Acta Geologica Sinica(English Edition) 2024年第1期98卷 10-31页

作者： zhang yingli GUO Xianqing MA Shouxian MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesCAGSBeijing 100037China Chinese Academy of Geological Sciences Beijing 100037China

During the Late Carboniferous to Early Permian,a rift was formed by post-collisional extension after ocean closure or an island arc-related basin formed by Paleo-Asian Ocean(PAO)subduction in the Xi Ujimqin ***,the closure time of the PAO is still under ***,to identify the origin of the PAO,the geochemistry and U-Pb age of zircons were analyzed for the extra-large deep marine,polymict clastic boulders and sandstones in the Shoushangou Formation within the *** analyses revealed magmatic activity and tectonic *** conglomerates include megaclasts of granite(298.8±9.1 Ma)and granodiorite porphyry(297.1±3.1 Ma),which were deposited by muddy debris *** of this study demonstrated that the boulders of granitoids have the geochemistry of typical I-type granite,characterized by low Zr+Nb+Ce+Y and low Ga/Al *** granitoid boulders were formed in island arc setting,indicating the presence of arc magmatism in the area that is composed of the Late Carboniferous to Early Permian subduction-related granitoid in southern Xi *** diagrams for determining sedimentary provenance using major and trace elements indicate that Shoushangou sediments originated from continental island arc-related felsic *** zircon U-Pb age cluster of 330–280 Ma was obtained,indicating input from granite,ophiolite,Xilin Gol complex,and Carboniferous sources to the *** basin was geographically developed behind the arc during the Early Permian period because the outcropped intrusive rocks in the Late Carboniferous to Early Permian form a volcanic *** comprehensive analyses of source areas suggest that Shoushangou sediments developed in a backarc basin in response to the northward subduction of the *** backarc basin and intrusive rocks,in addition to previously published Late Carboniferous to Early Permian magmatic rocks of arc unit in Xilin Gol,confirm the presence of an Early Permian trencharc-basin system in the region,r

关键词： provenance analysis backarc basin Shoushangou Formation Early Permian Central Asian Orogenic Belt

Provenance of the Early-Middle Devonian Shugouzi Formation in the Quruqtagh,Northeastern Xinjiang:Constraints from Sandstone Geochemistry and Heavy Mineral Analysis

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Acta Geologica Sinica(English Edition) 2022年第1期96卷 193-207页

作者： zhang yingli WANG Zongqi WANG Tao MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China

The Early-Middle Devonian Shugouzi Formation in the Quruqtagh block consists mainly of clastic ***,their provenance has been scarcely studied since it was *** of clastic rocks was commonly used to interpret the *** heavy mineral analyses help frame the U-Pb age from zircon grains,integrated with geochemical data from detrital tourmaline and *** techniques were used to characterize components of the sediment flux and define erosion areas in the Qurugtagh block,further providing evidence about the tectonic evolution of the South Tianshan and Tarim *** maximum depositional age constrained by detrital zircon dating was Early-Middle *** diagrams for sedimentary provenance using major and trace elements indicate that continental island arc-related felsic rocks were the major source rocks for the Shugouzi *** tourmalines are dravite and *** results of detrital tourmaline electron probe microanalysis(EPMA)show that the source rocks are mainly metasedimentary rocks and *** detrital chromian spinels within the sediments are characterized by high chroumium(Cr^(#))and varying magnesium(Mg^(#)).The discrimination plots reveal that these spinels were sourced from island arc magmatic *** laser ablation inductively-coupled plasma mass spectrometry(LA-ICP-MS)U-Pb chronology of detrital zircons suggests that the sediments were derived mainly from 414-491 Ma and 744-996 Ma magmatic *** restoration,sandstone geochemistry,EPMA,and detrital zircon geochronology indicate that the source rocks were predominantly derived from Late Ordovician and Devonian magmatic rocks and subordinately from recycled Neoproterozoic magmatic *** analyses of the source areas suggest that a remnant arc still existed in the Early Devonian and the Shugouzi Formation was deposited in a passive continental margin.

关键词： Shugouzi Formation provenance analysis tectonic setting passive continental margin Quruqtagh

Provenance of the Late Permian Xuanwei Formation in the Upper Yangtze Block: Constraints from the Sedimentary Record and Tectonic Implications

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Acta Geologica Sinica(English Edition) 2019年第6期93卷 1673-1686页

作者： zhang yingli JIA Xiaotong WANG Zongqi MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China Engineering Seismology Institute of Zhejiang Province Hangzhou 310013China

Xuanwei Formation is composed of mudstone,siltstone,and sandstone,with local ***,its provenance and tectonic setting have been scarcely *** this paper,we use sedimentology,electron probe microanalysis(EPMA),and detrital zircon dating to investigate its source area and depositional tectonic *** facies assemblages indicate that it formed in alluvial fan and fluvial river sedimentary *** strata thicknesses and facies distribution indicate that the sediment supply was from the *** results of EPMA show that chromian spinels within the sediments are characterized by high Cr#and varying Mg#.Discrimination plots suggest that these spinels were sourced from large igneous province(LIP)magmatic *** laser ablation inductively coupled plasma mass spectrometry(LA-ICP-MS)U–Pb chronology of detrital zircons suggests that the sediments were derived from intermediate–acid igneous rocks dating back to 251–260?*** could,therefore,conclude that the provenance of the Xuanwei Formation is from Emeishan basalt and synchronous felsic igneous rocks,which is consistent with the composition of the detrital *** detrital zircon dates also suggest that felsic magmatism occurred during the Late Permian,not after the eruption of the Emeishan *** on the sedimentary successions and provenance analysis,the tectonic setting for Xuanwei Formation deposition was a volcanic rifted margin.

关键词： Xuanwei Formation provenance analysis chromian spinel detrital zircon geochronology volcanic rifted margin

Zircon Geochronology and Trace Element Geochemistry from the Xiaozhen Copper Deposit, North Daba Mountain: Constraints on Albitites Petrogenesis

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Acta Geologica Sinica(English Edition) 2014年第1期88卷 113-127页

作者： WANG Gang WANG Zongqi zhang yingli WANG Kunming School of Earth Sciences and Resources China University of Geosciences Institute of Mineral Resources Chinese Academy of Geological Sciences

Albitite often accompanies with various metal and gem mineral deposits and a large number of occurrences have been reported globally, including the South Qinling orogen, China. The Xiaozhen copper deposit is a typical deposit in the North Daba Mountain area of the South Qinling orogen whose distribution is controlled by albitite veins and fractures. As there are few studies on the petrogenesis of albitite in Xiaozhen copper deposit, this paper focuses on the petrogenesis of albitite and its mineralization age. Detailed fieldwork and mineral microscopic observations initially suggest that albitite from the Xiaozhen copper deposit is igneous in origin. Further zircon trace element geochemistry studies indicate that these zircons have high Th/U ratios（〉0.5）, low La content, high（Sm/La）N and Ce/Ce＊values, and a strong negative Eu anomaly, which are commonly seen in magmatic zircons. The chondrite–normalized rare earth element（REE） patterns are consistent with magmatic zircons from throughout the world, and they fall within or near the field of magmatic zircons on discriminant diagrams. The calculated average apparent Ti–in–zircon temperature for young zircons is 780°C, consistent with magmatic zircon crystallization temperatures. Therefore, zircon geochemistry indicates that the albitite origin is magmatic. SIMS U–Pb dating on nine magmatic zircons yielded a concordia age of 154.8±2.2 Ma, which represents the formation of albitite and the metallogenic age. More importantly, it is consistent with the ages of Yanshanian magmatism and metallogenesis in the South Qinling orogen, so formation of the Xiaozhen copper deposit may be a closely related geological event.

关键词： Albitite petrogenesis SIMS zircon geochronology zircon trace element geochemistry Xiaozhen copper deposit North Daba Mountain

Geochronology and Geochemistry of Mafic Rocks in the Xuhe, Shaanxi, China: Implications for Petrogenesis and Mantle Dynamics

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Acta Geologica Sinica(English Edition) 2015年第1期89卷 187-202页

作者： WANG Kunming WANG Zongqi zhang yingli WANG Gang MLR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral Resources CAGS

The Xuhe mafic rocks, located in Ziyang county of Shaanxi Province, are dominated by diabase-porphyrite, gabbro-diabase, diabase, and pyroxene diorite. Primitive mantle-normalized multi-element patterns show that, the Xuhe marie rocks are enriched in large ion lithophile elements （LITE）, such as Ba and Pb, depleted in K and Sr for basic rocks, and are depleted in Sr, P and Ti for pyroxene diorite. Chondrite-normalized REE patterns display LREE enrichment （LaN/YbN = 9.34- 13.99） and have normalized patterns for trace element and REE similar to that of typical OIB. Detailed SIMS zircon U-Pb dating yields emplacement ages of 438.4 ± 3.1 Ma for Xuhe mafic rocks. The relatively low MgO （basic rock： 3.11-7.21 wt%; pyroxene diorite： 0.89-1.21 wt% ） and Mg# （0.20- 0.49） for Xuhe mafic rocks suggest that they were possibly originated from an extremely evolved magma. The rising parental mafic magmas underwent pyroxene and plagioclase fractionation. Crustal contamination of pyroxene diorite before emplacement occurred at a higher crustal level compared to other lithology in Xuhe mafic rocks. The degree of partial melt was low （5%-10%） and in garnetspinel transition facies. Sr-Nd isotope of pyroxene diorite and enrichment mantle characteristics for Xuhe mafic rocks suggest that mafic rocks in the North Daba Mountains were derived from a mixture of HIMU, EMII and small amount of EMI components. Furthermore, this study discusses mantle geodynamic significance of Xuhe mafic rocks in the Silurian, which indicates subduction and uplift of magma caused back-arc extension.

关键词： Xuhe mafic rock SIMS U-Pb chronology geochemistry petrogenesis mantle dynamic

Neoproterozoic Volcanic Rocks in the Southern Quruqtagh of Northwest China:Geochemistry,Zircon Geochronology and Tectonic Implications

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Acta Geologica Sinica(English Edition) 2013年第1期87卷 118-130页

作者： zhang yingli WANG Zongqi YAN Zhen WANG Tao Institute of Mineral Resources Chinese Academy of Geological Sciences Institute of Geology Chinese Academy of Geological Sciences

The Early Neoproterozoic Beiyixi Formation volcanic rocks of the southern Quruqtagh comprise mainly of a suite of tholeiitic basalts, alkaline andesites, and calc-alkaline rhyolites. The rhyolites are characterized by variably fractionated enrichment in light rare earth elements （LREE） and fiat in heavy rare earth elements （HREE）, and strongly negative Eu anomalies. Compared to the rhyolites, the andesites also exhibit enrichment in LREE and flat HREE （chondrite-normalized values of La/Yb,and La/Sm are 13.30-41.09, 3.18-6.89 respectively）. Their rare earth element patterns display minor negative Eu anomalies. Both of them exhibit coherent patterns with strongly to moderately negative anomalies of Nb, Zr, Ti, and Hf on spider diagrams. Two rhyolite and one andesite magmatic zircons with defined oscillatory zoning yielded weighted mean 206pb/23Su ages of 743 ± 7 Ma, 741±2 Ma, and 7274 Ma. These ages are interpreted to represent the timing of volcanic eruptions. According to geochemistry and rock type, these volcanic rocks formed within a continental island-arc environment following subduction of the oceanic crust during the Early Neoproterozoic period.

关键词： Quruqtagh Beiyixi Formation volcanic rocks geochemistry zircon geochronology,tectonic setting

Deformation Structures of the Madao Gneiss in South Qinling:Structural Analysis,Geochronological Constraints,and Tectonic Implications

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Acta Geologica Sinica(English Edition) 2014年第4期88卷 1102-1119页

作者： WANG Dongsheng WANG Zongqi zhang yingli WANG Tao CHEN Lei zhang Yutao Institute of Mineral Resources Chinese Academy of Geological Sciences State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Institute of Geology Chinese Academy of Geological Sciences

The tectonic evolution of South Qinling, which is a main part of the Qinling orogenic belt, is still in dispute and deformation history of South Qinling is poorly studied. In this paper, detailed structural, microstructural, quartz c-axis fabric analysis, and geochronology results for the Madao gneiss in South Qinling are presented to characterize the deformation history. Results show that rocks in the northern part （Tiefodian-Laozhanggou） experience general shearing and deform at relative low temperature. The shear sense generally is south to north. In contrast, rocks in the southern part （Laozhanggou-Panjiahe） are weakly sheared with pure shear features and evidence of high- temperature deformation. Based on the analyses, we conclude that there exist two distinct deformation geometries in the Madao gneiss and accordingly we can divide the deformation into two stages. The early stage is represented by regional shortening, while the late stage features northward thrust shearing and evidence shows that it was a progressive process between them. LA-ICP MS U-Pb dating of zircons from pre-deformational migmatite veins yields age of 198.5 ±2.0 Ma. This result, in combination with the age of post-deformational granite, indicates that the northward thrust shearing of the Madao gneiss occurred in the Late Triassic. In view of these results and other reported data in South Qinling, we propose that deformation in Madao gneiss may result from the initial collision and subsequent northward accretion in Late Triassic.

关键词： South Qinling Madao gneiss quartz c-axis fabric deformation stage zircon U-Pb dating

Melting and shrinkage of cryosphere in Tibet and its impact on the ecological environment

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Journal of Arid Land 2011年第4期3卷 292-299页

作者： JianGuo zhang yingli WANG YunSong JI DeZhi YAN School of Geography Nantong University Nantong 226007 China

Global warming is having a profound impact on global ecological systems,and has inevitably induced changes in the cryosphere,one of the five layers of the *** changes include the shrinking and reduction in the area and volume of both the mountain glaciers and the ice caps covering the North and South poles,and the melting of permafrost and thickening of the active frost *** changes in the cryosphere have inevitably induced ecological and environmental changes in its *** some of these changes are beneficial to mankind,such as an increase in water circulation,short term increases in water volumes and the enlargement of the cultivatable area,others are extremely hazardous,like the flooding of lowlands caused by an increased sea level elevation,debris flow caused by glaciers,glacier lake bursts,undermined building safety caused by permafrost melting,the deterioration of alpine cold meadows,and the surface aridization and desertification of ***,having a major part of the cryosphere in China,is home to the most widely spread glaciers and permafrost,which play a vital role in regulating water resources,climate,environment and the ecological safety in China and ***,due to global warming,the glaciers and permafrost in Tibet have recently changed dramatically,exhibiting shrinkage and melting,which threatens long-term water resources,and the ecological and environmental safety of *** on existing research,this paper discusses the relationship between global warming and the melting and shrinkage of the *** results show that the cryosphere＇s melting and shrinkage in Tibet are the direct result of global *** melting of glaciers has led to a series of disasters,such as changes in river runoff,the heightened frequency of debris flows induced by glaciers and the outbursts of glacier *** melting of the permafrost also resulted in a series of ecological and environmental problems in Tibet,such as the degradation an

关键词： Tibet cryosphere global warming ecological environment

7, 8-dihydroxycoumarin improves neurological function in a mouse model of sciatic nerve injury

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Neural Regeneration Research 2012年第6期7卷 445-450页

作者： Jianshi Du Qing Zhao yingli zhang Yu Wang Ming Ma Department of Vascular Surgery China-Japan Union Hospital Jilin University Changchun 130033 Jilin Province China Department of Neurology China-Japan Union Hospital Jifin University Changchun 130033 Jilin Province China

In the present study, a mouse model of sciatic nerve injury was treated with intraperitoneal injection of 7, 8-dihydroxycoumarin （10, 5, or 2.5 mg/kg per day）. Western blot and real-time PCR results showed that growth associated protein 43 expression was significantly increased in the L4-6 segments of the spinal cord. The amplitude and velocity of motor nerve conduction in the sciatic nerve were significantly increased in model mice. In addition, the appearance of the myelin sheath in the injured sciatic nerve was regular, with an even thickness and clear outline, and the surrounding fibroplasia was not obvious. Our results indicate that 7, 8-dihydroxycoumarin can promote the repair of injured nerve by upregulating growth associated protein 43 expression in the corresponding spinal cord segments of mice with sciatic nerve injury.

关键词： 7, 8-dihydroxycoumarin growth associated protein 43 sciatic nerve peripheral nerve injury neural regeneration