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Detrital Zircon Geochronology of Early Jurassic Successions in the Central yunnan Basin， SW China: Implications of Sedimentary Provenance and Tectonic Evolution

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Journal of Earth Science 2023年

作者： LiangDong Luo Jun Wang YuJie Yuan ZeRui Liu MengYan Jiao YingAo Zhang SaiKe Zhang School of Earth Sciences， yunnan University key laboratory of sanjiang metallogeny and resources exploration and utilization MNR yunnan key laboratory of sanjiang metallogeny and resources exploration and utilization School of Earth Sciences， China University of Geosciences

The Central yunnan Basin (CYB) that tectonically located on the southwest margin of the Yangtze Block and to the eastern segment of the Paleo-Tethys tectonic domain， is a typical ‘red bed’ sedimentary basin formed since Late Triassic. The CYB is composed of mega-thick fluvial and lacustrine facies successions. However， the tectonic evolution and sedimentary provenance studies on this basin are scarce. In this study， we report new detrital zircon ages of four sandstones from the Lower Jurassic Fengjiahe Formation (FJF)， including four major clusters of 1 810–2 060， 760–870， 430–485， and 254–280 Ma， with sporadic Archean， Cambrian， and Triassic ages. We interpret that the Archaean and Proterozoic zircons were mainly derived from the western Yangtze Block， which may recycle from the Jiangnan Orogen， the Cathaysia Block and the Proterozoic igneous rocks. Ordovician and Silurian zircons were probably from the Ailaoshan orogenic belt， and the Lancang Group in western yunnan， as well as the Yangtze， Cathaysia and Indosinian Blocks. Permian zircons probably came from the Ailaoshan orogenic belt and the Emeishan basalt. The youngest zircon age of ～212.9 Ma indicates that the depositional age of the FJF is younger than the Norian stage. We also proposed a geodynamic model of the CYB and the Ailaoshan orogenic belt during the Mesozoic. The Simao Block to the west of the CYB constituted the Ailaoshan orogenic belt and collaged with the Yangtze Block during the Early Triassic， provided sedimentary provenance to the CYB. The Changning-Menglian zone that composed of the Baoshan and the Simao Blocks， uplifted in the Late Triassic and provided provenance to the CYB. Collapse of the Ailaoshan orogenic belt in Late Triassic probably provided channel for source materials that transported from the Lincang granites to the CYB. We propose a transtensional tectonic setting of the central yunnan during the Early Jurassic， after a short collision during the Indosinian movement in the Late Tr

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Petrogenesis and Physicochemical Conditions of Fertile Porphyry in Non-arc Porphyry Mineralization:A Case from Habo Porphyry Cu-Mo Deposits,SW China

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Acta Geologica Sinica(English Edition) 2023年第2期97卷 469-485页

作者： ZHANG Aiping ZHENG Yuanchuan SHEN Yang Qi Qunjia WANG Zixuan WU Changda WANG Lu School of Earth Sciences Yunnan UniversityKunming 650500China yunnan key laboratory of sanjiang metallogeny and resources exploration and utilization Kunming 650500China School of Earth Sciences and resources China University of GeosciencesBeijing 100083China State key laboratory of Marine Geology Tongji UniversityShanghai 200092China

The Habo deposit is a typical porphyry Cu-Mo deposit in the Ailaoshan–Red River metallogenic *** minerals in the Habo deposit typically occur as veins in the monzonite *** U-Pb dating suggests that the monzonite porphyry formed at 35.07±0.38 *** monzonite porphyry is characterized by high SiO_(2),Al_(2)O_(3),K_(2)O and Na_(2)O contents,with A/CNK ratios ranging from 0.97 to *** samples exhibit fractionated REE patterns,characterized by high(La/Yb)N ratios(9.4–13.6,average of 11.2).They show adakite-like geochemical features,high Sr concentrations(627–751 ppm,average of 700 ppm),low Y concentrations(15.13–16.86 ppm,average of 15.81 ppm)and high Sr/Y values(39.5–47.4,average of 44.3).These samples have high initial^(87)Sr/^(86)Sr ratios(0.7074–0.7076)and negativeεNd(t)values(-5.1 to-3.7),whereas the zirconεHf(t)values range from-2.2 to+0.4,suggesting that the monzonite porphyry was derived from the partial melting of a thickened juvenile lower *** oxygen fugacity,calculated on the basis of the chemical composition of the amphiboles,shows?NNO values ranging from+1.65 to+2.16(average of 1.94)and lg(fO_(2))ranging from-12.72 to-11.99(average of-12.25),indicating that the monzonite porphyry has high oxygen *** have high Ce^(4+)/Ce^(3+)ratios(29.29–164.24,average of 84.92),with high?FMQ values ranging from+0.50 to+1.51(average of 0.87)and high lg(fO_(2))values ranging from-14.72 to-12.85(average of-14.07),which also indicates that the oxygen fugacity of the magma was *** dissolved water content of the Habo monzonite porphyry is 9.5–11.5 wt%,according to the geochemical characteristics,zircon-saturation thermometry(692–794°C)and the mineral phases(amphibole,no plagioclase)in the deep magma *** with previous studies,we propose that the high oxygen fugacity and high water content of magma played key roles in controlling the formation of the Habo and other Cu-Mo-Au deposits in the Ailaoshan–Red River metallogenic be

关键词： magmatic oxidation state water content monzonite porphyry Habo porphyry Cu-Mo deposit Ailaoshan-Red River metallogenic belt

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Latest Neogene Paleoclimate Variation in yunnan,Southwest China,Revealed by Fossil Leaf Physiognomy

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Acta Geologica Sinica(English Edition) 2023年第4期97卷 1268-1281页

作者： DAI Jing CHEN Weizhao HUANG Liang ZHANG Yi’nan School of Earth Science Yunnan UniversityKunming 650500China Ministry of Natural resources key laboratory of sanjiang metallogeny and resources exploration and utilization Kunming 650051China yunnan Institute of Geological Survey Kunming 650216China Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of SciencesBeijing 100044China

yunnan Province,located in the southeastern margin of the Tibetan Plateau,can provide important information on how climate change was influenced by global ***,its variation patterns in temperature and precipitation during the latest Neogene are not *** on the 357 specimens assigned to 31 morphotypes of plant fossils from the upper Pliocene Ciying Formation in Yiliang County,yunnan Province,Southwest China,paleoclimate was estimated by Leaf Margin Analysis and Climate Leaf Analysis Multivariate *** to the present climate,the mean annual temperature and coldest month temperature have not changed significantly since the late Pliocene,whereas the warmest month temperature has decreased *** precipitation-related parameters have decreased,particularly winter *** with the climatic data of the same period in other areas of yunnan,the western and eastern yunnan has shown a similar pattern in temperature variation since the late Pliocene except for central yunnan;whereas the variation in precipitation does not follow a common law except for a consistent decrease in winter *** study reinforced the fact that under the background of global cooling and intensified monsoon systems,different areas of yunnan exhibit different climatic responses to these changes because of their topographic heterogeneities.

关键词： plant fossil paleoclimate reconstruction monsoon Pliocene yunnan

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Metallogenic Age and Ore-forming Material Sources of the Dahongshan Fe-Cu Deposit,yunnan Province:Insights from Molybdenite Re-Os Dating and H-O-S-Pb Isotopes

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Acta Geologica Sinica(English Edition) 2023年第6期97卷 1698-1718页

作者： YE Zifeng YANG Guangshu YU Wenxiu CHEN Aibing JIA Fuju School of Land and resources Engineering Kunming University of Science and TechnologyKunming 650093China College of Earth Sciences Chengdu University of TechnologyChengdu 610059China key laboratory of sanjiang metallogeny and resources exploration and utilization MNRKunming 650051China

The Dahongshan Fe-Cu(-Au)deposit is a superlarge deposit in the Kangdian metallogenic belt,southwestern China,comprising approximately 458 Mt of Fe ores(40%Fe)and 1.35 Mt *** main types of Fe-Cu(-Au)mineralization are present in the Dahongshan deposit:(1)early submarine volcanic exhalation and sedimentary mineralization characterized by strata-bound fine-grained magnetite and banded Fe-Cu sulfide(pyrite and chalcopyrite)hosted in the Na-rich metavolcanic rocks;(2)late hydrothermal(-vein)type mineralization characterized by Fe-Cu sulfide veins in the hosted strata or massive coarse-grained magnetite orebodies controlled by *** previous studies have focused primarily on the early submarine volcanic and sedimentary mineralization of the deposit,data related to late hydrothermal mineralization is *** order to establish the metallogenic age and ore-forming material source of the late hydrothermal(-vein)type mineralization,this paper reports the Re-Os dating of molybdenite from the late hydrothermal vein Fe-Cu orebody and H,O,S,and Pb isotopic compositions of the hydrothermal quartz-sulfide *** primary aim of this study was to establish the metallogenic age and ore-forming material source of the hydrothermal type *** show that the molybdenite separated from quartz-sulfide veins has a Re-Os isochron age of 831±11 Ma,indicating that the Dahongshan Fe-Cu deposit experienced hydrothermal superimposed mineralization in *** molybdenite has a Re concentration of 99.7-382.4 ppm,indicating that the Re of the hydrothermal vein ores were primarily derived from the *** δ^(34)S values of sulfides from the hydrothermal ores are 2‰-8‰ showing multi-peak tower distribution,suggesting that S in the ore-forming period was primarily derived from magma and partially from calcareous sedimentary ***,the abundance of radioactive Pb increased significantly from ore-bearing strata to layered and hydrothermal vein ores,which m

关键词： stable isotopes Re-Os dating ore-forming material Dahongshan Fe-Cu deposit Kangdian region

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Discovery of the Archean Magmatic Cu-Ni Sulfide Deposit in China—Taoke Deposit, Shandong Province

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Acta Geologica Sinica(English Edition) 2020年第2期94卷 561-562页

作者： SUN Tao WANG Denghong LI Chao ZHANG Zengqi SUN Bin CHENG Wei LI Wanting ZHANG Aiping School of Earth Sciences Yunnan University.MNR Key Laboratory of Sanjiang Metallogeny and Resources Exploration and UtilizationKunming 650091China MNR key laboratory of metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological Sciences.Beijing 100037China National Research Center for Geoanalysis Key Laboratory of Re-Os Isotope GeochemistryCAGSBeijing 100037China Shandong Institute of Geological Sciences Jinan 250013China

The formation ages of global magmatic sulfide Ni-Cu deposits are from Archean to Mesozoic,the Neoarchean and Neoproterozoic are the two *** China,the formation ages of magmatic sulfide deposits are from Proterozoic to Mesozoic,and the Neoproterozoic and late Paleozoic are the two peaks,.Compared with the global magmatic deposits,there is no case study of the Archean magmatic Ni-Cu sulfide deposits in China *** nickel deposits formed in Neoproterozoic are located on the margin of the North China Block and Yangtze Block(***,Dapoling),and those formed in the late Paleozoic are mainly distributed in the Central Asian Orogenic Belt(CAOB).Emeishan and Tarim Large Igneous Provinces(LIPs).such as Kalatongke,Yangliuping,and Pobei.

关键词： magmatic Mesozoic Archean

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Discovery of rhyolitic tuffaceous slate in the southwestern margin of Yangtze Craton:Zircon U-Pb ages(2491 Ma)and tectonic-thermal events

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China Geology 2021年第4期4卷 616-629页

作者： Jun-ping Liu Su-mei Tian Xun-zao Zhu Jin-hua Ma Jing Li Shao-bin Hu Sai-ying Yu Hu Zhang Zhong-ming She Xu-gui Li yunnan Institute of Geological Survey Kunming 650216China China University of Geosciences Beijing 100083China key laboratory of sanjiang metallogeny and resources exploration and utilization Ministry of Natural ResourcesKunming 650051China yunnan Department of Natural resources Kunming 65000China

The Mesoproterozoic Dongchuan Group that is widely exposed in Yimen area,central yunnan Province is a series of sedimentary sort of low-grade metamorphic rocks interbedded with volcanic rocks,which are closely related to the early tectonic evolution of the ***,its formation era,sedimentary filling sequence,and geotectonic characteristics have always been in *** this study,several rhyolitic tuffaceous slate interlayers with a centimeter-level thickness were found in the previously determined Heishan Formation of the Dongchuan Group located to the western part of Yimen-Luoci fault *** paper focuses on the study of the rhyolitic tuffaceous slate in Qifulangqing Village,Tongchang Township,Yimen ***-ICP-MS zircon dating was conducted,achieving the crystallization age of magma of 2491±15 Ma and the metamorphic ages of about 2.3 Ga,2.0 Ga,and 1.8 Ga for the first ***,according to in-situ Hf isotope analysis,the zirconεHf(t)values were determined to range from−3.0 to 7.6,with an average of ***,the first-stage Hf model age(TDM1)was determined to be 2513−2916 Ma,indicating that the provenance of the rhyolitic tuffaceous slate is the depleted mantle or juvenile crust between the Middle Mesoarchean and the Late ***,it is believed that the strata of the slate were deposited in the Late Neoarchean,instead of the Mesoproterozoic as determined by previous ***,it is not appropriate to group the strata into the Mesoproterozoic Dongchuan ***,they should be classified as the Maolu Formation of the Neoarchean Puduhe Group given the lithologic association and regional ***,the magma ages of 2491±15 Ma are highly consistent with the eras of the large-scale Late Neoarchean orogenic magmatic activities on the northern margin of the Yangtze Craton,and thus reflect the orogenic process consisting of subduction and collision from Late Neoarchean to Early *** ma

关键词： Maolu Formation Puduhe Group Late Neoarchean Zircon U-Pb age Tectonic-thermal event Geological survey engineering Eastern margin of Qinghai-Tibet Plateau Yangtze Craton

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Response to the Lomagundi-Jatuli Event in the southwestern margin of the Yangtze Plate:Evidence from the carbon and oxygen isotopes of the Paleoproterozoic Yongjingshao Formation

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China Geology 2023年第1期6卷 50-60页

作者： Jun-ping Liu Wei Yin Shi-pan Yang Jiang-tai Zhao Wen-tao Zeng Feng Tang Shi-jun He Wei-ke Li School of Earth Sciences and resources China University of GeosciencesBeijing 100083China yunnan Institute of Geological Survey Kunming 650216China key laboratory of sanjiang metallogeny and resources exploration and utilization MNRKunming 650051China Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China The Second Geological Institute of China Metallurgical Geology Bureau Fuzhou 350108China

The Lomagundi-Jatuli Event(LJE)refers to the significant positive carbon isotope excursion in seawater constituents that occurred immediately after the increase in atmospheric oxygen content during the Paleoproterozoic(2.22-2.06 Ga).Theδ^(13)C values of 46 dolostone samples collected from the Paleoproterozoic Yongjingshao Formation varied in the range of 0.05‰-4.95‰(V-PDB;maximum:4.95‰)in this study,which may be related to the multicellular eukaryotes in the Liangshan Formation in the Yimen *** are much higher than theδ^(13)C values of marine carbonates(-1.16‰on average).Theδ^(13)C values of other formations in the Paleoproterozoic Yimen Group are *** notable positive carbon isotope anomalies of the Yongjingshao Formation indicate the response to the LJE at the southwestern margin of the Yangtze Block,which is reported for the first ***,they are comparable to theδ^(13)C values of carbonates in the Dashiling Formation of the Hutuo Group in the Wutaishan area in the North China Craton,the Wuzhiling Formation of the Songshan Group in the Xiong'er area,Henan Province,and the Dashiqiao Formation of the Liaohe Group in the Guanmenshan area,Liaoning ***,it can be further concluded that the LJE is a global *** study reveals that LJE occurred in Central yunnan at 2.15-2.10 Ga,lasting for about 50 *** macro-columnar,bean-shaped,and microfilament fossils and reticular ultramicrofossils of multicellular eukaryotes in this period were discovered in the Liangshan Formation of the Yimen *** are the direct cause for the LJE and are also the oldest paleontological fossils ever *** major events successively occurring in the early stage of the Earth include the Great Oxygenation Event(first occurrence),the global Superiortype banded iron formations(BIFs),the Huronian glaciation,the Great Oxygenation Event(second occurrence),the explosion of multicellular eukaryotes,the positive carbon isotope excursion,and the global a

关键词： Lomagundi-Jatuli Event Eucaryon Paleoproterozoic Bean-shaped fossil Micro-filament fossil Micro-columnar fossil Carbon and oxygen isotopes Yangtze Plate Geological survey engineering China

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Protoconodont fossils for refining the Cambrian bottom and the contribution to shale gas formation along the southwest margin of Yangtze Block

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China Geology 2020年第4期3卷 558-566页

作者： Jun-ping Liu Si-cun Song Wei Wang Feng Tang Jing Li Xiang-dong Duan Xiao-hu Wang Bai-dong Sun Sai-ying Yu Shao-bin Hu Wen-ting Duan yunnan Institute of Geological Survey Kunming 650216China key laboratory of sanjiang metallogeny and resources exploration and utilization Ministry of Natural ResourcesKunming 650051China Department of Earth Sciences University College LondonLondon WC1E6BTUnited Kingdom key laboratory of Stratigraphy and Palaeontology Chinese Academy of Geological SciencesMinistry of Natural ResourcesBeijing 100037China yunnan Institute of Land and resources Planning and Design Kunming 650216China yunnan Department of Natural resources Kunming 65000China

It has been an intense debate on the exact boundary between Ediacaran and Cambrian in the southwest Yangtze *** calibration of this critical boundary has a remarkable influence on the further investigation of the break-up of the Rodinia Supercontinent,the early life evolution,and the mechanism of the phosphorite *** and Cambrian strata and fossils are widely distributed in Anning,yunnan Province in *** recent years,the Xiaowaitoushan Member from the Lower Yuhucun Formation has been *** this interval with continuous collections,the first appearance datums(FADs)of the protoconodont(Fomitchella *** Yang et He,Protohertzina *** Missarzhevsky)and globular embryos fossil(Olivooides sp.)earlier than these in the Lower Cambrian strata of the Meishucun Formation were *** discovery indicates that the Xiaowaitoushan Member has included more FADs than the previously discovered single FAD of Anabarites primitivus Qian et Jiang,and the Ediacaran–Cambrian boundary in southwest China should be replaced below the Point“A”of the Meishucun Formation in yunnan *** Point“B”of the Meishucun Formation is younger than the suggested age 541 Ma of the Ediacaran–Cambrian boundary and can no longer reference the Global Boundary Stratotype Section and Point(GSSP)correlation in southwest *** can be suggested based on the previous stratigraphy and palaeontology studies from northern Sichuan and southern Shaanxi and the FAD of the globular embryos fossils that the Ediacaran‒Cambrian boundary in the southwest Yangtze Block should be placed at the base of the Xiaowaitoushan Member;other phosphorite strata refer to Xiaowaitoushan *** discovery of the FADs of the shelly fossils in the Xiaowaitoushan Member provides new evidence for the global correlation of the Ediacaran–Cambrian boundary in the southwest Yangtze *** conodont discoloration index(CAI)of the specimens in Anning is between 2 and 3,which indicates

关键词： Shale gas Ediacaran-Cambrian boundary Protoconodont Embryos fossil Xiaowaitoushan Member Southwest Yangtze Block Geological survey engineering yunnan Province China

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Identifying the spatiotemporal characteristics of individual red bed landslides: a case study in Western yunnan, China

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Journal of Mountain Science 2022年第6期19卷 1748-1766页

作者： ZHAO Xin LI Guo ZHAO Zhi-fang LI Chun-xiao CHEN Qi YE Xian Institute of International Rivers and Eco-Security Yunnan UniversityKunming 650050China Broadvision Engineering Consultants Co. Ltd.Kunming 650031China yunnan key laboratory of Digital Communications Kunming 650000China School of Earth Sciences Yunnan UniversityKunming 650050China Research Center of Domestic High-resolution Satellite Remote Sensing Geological Engineering Kunming 650500China MNR key laboratory ofsanjiang metallogeny and resources exploration&utilization Kunming 650051China

Strata in red bed areas have typical characteristics of soft-hard interbedding and high sensitivity to water. Under the comprehensive action of internal stratigraphic structure and external hydrological factors, red bed landslides have highly complex spatiotemporal characteristics, presenting significant challenges to the prevention and control of landslide disasters in red bed areas, especially for slope and tunnel engineering projects. In this study, we applied an interdisciplinary approach combining small baseline subset interferometric synthetic aperture radar(SBAS-InSAR), deep displacement monitoring, and engineering geological surveying to identify the deformation mechanisms and spatiotemporal characteristics of the Abi landslide, an individual landslide that occurred in the red bed area of Western yunnan, China. Surface deformation time series indicated that a basic deformation range developed by March 2020. Based on In SAR results and engineering geological analysis, the landslide surface could be divided into three zones: an upper sliding zone(US), a lower uplifted zone(LU), and a toe zone(Toe). LU was affected by the structure of the sliding bed with variable inclination. Using deep displacement curves combined with the geological profile, a set of sliding surfaces were identified between different lithology. The groundwater level standardization index(GLSI) and deformation normalization index(DNI) showed different quadratic relationships between US and LU. Verification using the Pearson correlation analysis shows that the correlation coefficients between model calculated results and measured data are 0.7933 and 0.7577, respectively, indicating that the DNI-GLSI models are applicable. A fast and short-lived deformation sub stage(ID-Fast) in the initial deformation stage was observed, and ID-Fast was driven by concentrated rainfall.

关键词： Red bed landslide Spatiotemporal characteristic SBAS-InSAR Deep displacement monitoring Engineering geological survey Western yunnan

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40^Ar-39^Ar Dating of the Mahuaping W-Be deposit, Northwestern Yunnnan Province, China, and its Geological Significance

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Acta Geologica Sinica(English Edition) 2018年第2期92卷 864-865页

作者： JIA Fudong ZHANG Changqing LIU Huan HUA Zhixin KONG Zhigang MENG Xuyang MLR key laboratory of metallogeny and Mineral Assessment Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing 100037 China School of Earth and Space Sciences Peking University Beijing 100871 China Shangri-la Tiger-leap Xinlei Tungsten Mining Industry LLC Diqing 674402 Yunnan China Kunming University of Science and Technology Kunming 650093 Yunnan China Department of Earth and Atmospheric Sciences University of Alberta Edmonton Alberta T6G 2E3 Canada

Objective Located near the intersection of Yangtze craton, Tibet- sanjiang orogen and Songpan-Ganzi orogen of Northwest yunnan Province, the Mahuaping deposit is a unique large -scale tungsten-beryllium-fluorite ore deposit ever discovered in this area. In recent years, many studies have been carried out in sanjiang Tethyan metallogenic belt and aforementioned adjacent regions. To date, however, little attention has been paid to this deposit, for example, the geochronology of Mahuaping W-Be deposit still remains unsolved. In this study, we have pioneered research about muscovite 40Ar-39Ar age to better understand the geochronology of the Mahuaping W-Be deposit.

关键词： Ar Ar Dating of the Mahuaping W-Be deposit,Northwestern Yunnnan Province,China,and its Geological Significance Be

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