|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | SHRIMP U-Pb zircon age of tuff at the bottom of the Lower Cambrian Niutitang Formation,Zunyi,South China显示文摘A SHRIMP U-Pb zircon geochronology study of the tuff at the bottom of the Lower Cambrian Niutitang Formation at Songlin,Zunyi,South China yielded a mean 206Pb/238U age of 518±5 Ma.It is significantly younger than the Re-Os ages of 537―542 Ma for the overlying polymetallic Ni-Mo-PGE-rich layer in the basal Niutitang Formation at Songlin,suggesting that the Re-Os ages might represent that of the original magma chamber for the Ni-Mo-PGE-rich layer rather than the formation age of the strata.The intra-basinal stratigraphic correlation also implies that the absolute age of the Chengjiang biota should be younger than 518±5 Ma.Our new result,together with the SHRIMP U-Pb zircon age for the K-bentonite in the Zhongyicun member of the Zhujiaqing Formation at the Meishucun section,Yunnan Province,provides a temporal constraint for the Lower Cambrian of the Yangtze Platform in South China. | ZHOU MingZhong LUO TaiYi LI ZhengXiang ZHAO Hui LONG HanSheng YANG Yong | 2008 | Chinese Science Bulletin2008，53，4： | 17 |
| 2 | SHRIMP zircon age for a K-bentonite in the top of the Laobao Formation at the Pingyin section,Guizhou,South China显示文摘The Lower Cambrian on the Yangtze Platform in South China(internationally equivalent to the Nerreneuvian and 2nd series of the Cambrian)is valuable for understanding the early evolution of life,the global biogeochemical circles,and the major changes of the ocean.In particular,a precise radiometric calibration of the Lower Cambrian of this region is a critical realm in its multidisciplinary studies.A SHRIMP U-Pb geochronology study of the K-bentonite in the topmost Laobao Formation at the Pingyin section,Guizhou,South China yielded an age of 536±5 Ma(MSWD=0.75),suggesting that the K-bentonite here can be correlated with the intensely studied K-bentonite within the middle Zhongyicun Member(Bed 5)of the Zhujiaqing Formation at the Meishucun section in Yunnan.Such a regional correlation result reveals that the Bed 5 K-bentonite also extends into deeper-water environments rather than being deposited merely in the shallow platform interior of the Yangtze Platform.The age of the K-bentonite at the Pingyin section also implies that its overlying polymetallic Ni-Mo layer should be younger than 536±5 Ma.Hence the previous placement of the Precambrian/Cambrian boundary at this layer is inappropriate.Combined with the results of stratigraphic correlations,it is suggested that the K-bentonites in the middle Zhongyicun Member of the Zhujiaqing Formation(or the equivalents)and the base of the Shiyantou Formation(or its equivalents),together with the polymetallic Ni-Mo layer,serve as three important marker beds.Their self-consistent radiometric ages have established an improved geochronologic framework for the Lower Cambrian in South China. | ZHOU MingZhong LUO TaiYi LIU ShiRong QIAN ZhiKuan XING LeCai | 2013 | Science China Earth Sciences2013，56，10： | 10 |
| 3 | Timing the termination of the Doushantuo negative carbon isotope excursion: evidence from U-Pb ages from the Dengying and Liuchapo formations,South China显示文摘The Doushantuo negative carbon isotope excursion(DOUNCE) is the largest known marine inorganic carbon isotope anomaly. The origin of this pronounced negative excursion is still an enigmatic issue that attracts geologists. Time constraints on the excursion are the critical information that would provide insight into its genesis. In previous decades, the timing of its termination has been constrained by the widely cited zircon U-Pb age of 550.5 ± 0.8 Ma for the tuff at the top of the Miaohe Member at the Jiuqunao section in the Yangtze Gorges area, South China. However, results of recent studies indicate that the reliability of this time constraint needs to be re-evaluated. Here, a geochronological study was carried out using two K-bentonites from Fanglong in South China. A K-bentonite in the lower Dengying Formation yielded a U-Pb age of 557 ± 3 Ma, while a K-bentonite in the basal Liuchapo Formation yielded an age of 550 ± 3 Ma. Based on regional correlations between the Ediacaran successions in South China,the age(557 ± 3 Ma) for the K-bentonite in the lower Dengying Formation may serve as a second critical timing constraint for the ending of the DOUNCE. Combined with available estimates of the DOUNCE duration, our new data indicate that the DOUNCE has a maximum onset age ~570 Ma. | Mingzhong Zhou Taiyi Luo Warren D.Huff Zhiqing Yang Guanghong Zhou Tian Gan Hua Yang Di Zhang | 2018 | Science Bulletin2018，63，21： | 6 |
| 4 | Constraints on the Ediacaran-Cambrian boundary in deep-water realm in South China: Evidence from zircon CA-ID-TIMS U-Pb ages from the topmost Liuchapo Formation显示文摘The placement of the Ediacaran-Cambrian boundary in deep-water realm in South China and the high-precision temporal framework for the Ediacaran-Cambrian transition in this region have not yet been completely solved. Recently, we have found two K-bentonite beds in the top of the Liuchapo Formation at the Pingyin section, Guizhou Province. It provides an opportunity for constructing the temporal framework of the transitional strata on the Yangtze Platform in South China and for determining the Ediacaran-Cambrian boundary in this area. In this study, we conducted high-precision CA-ID-TIMS U-Pb dating on zircons from the two K-bentonites. The ages of the two K-bentonites were precisely constrained at 536.40±0.47/1.1/1.2 Ma(2σ, n=7, MSWD=0.92) and 541.48±0.46/1.1/1.2 Ma(2σ, n=8, MSWD=1.3). Combining the geochronological results with organic carbon isotope data of chert in the topmost Liuchapo Formation from the section, we suggest that the EdiacaranCambrian boundary should be consistent with a significant negative organic carbon isotope excursion between the two Kbentonites. The scheme of the Ediacaran-Cambrian boundary in this study is of great significance for global correlation, and further for unravelling the information of the terminal Ediacaran-early Cambrian ocean. | Wei WANG Mingzhong ZHOU Zhuyin CHU Junjie XU Chaofeng LI Taiyi LUO Jinghui GUO | 2020 | Science China Earth Sciences2020，63，8： | 4 |
| 5 | Geochemistry and petrogenesis of Late Ladinian OIB-like basalts from Tabai,Yunnan Province,China显示文摘Major and trace elements analysis has been carried out on the Late Ladinian Tabai basalts from Yunnan Province with the aim of studying their petrogenesis. Their SiO2 contents range from 43.63 wt.% to 48.23 wt.%. The basalts belong to the weakly alkaline(average total alkalis Na2 O+K2O=3.59 wt.%), high-Ti(3.21 wt.% to 4.32 wt.%) magma series. The basalts are characterized by OIB-like trace elements patterns, which are enriched in large ion lithosphile elements(LILE) including Rb and Ba, and display negative K, Zr and Hf anomalies as shown on the spider diagrams. The Tabai basalts display light rare-earth elements(LREE) enrichment and are depleted in heavy rare-earth elements(HREE) on the REE pattern. Those dates indicate that the parental magma of the Tabai basalts was derived from low-degree(1%–5%) partial melting of garnet peridotite. The magma underwent olivine fractional crystallization and minor crustal contamination during their ascent. The Tabai basalts were related to a relaxation event which had triggered the Emeishan fossil plume head re-melting in the Middle Triassic. | ZHANG Jiawei HUANG Zhilong LUO Taiyi QIAN Zhikuan ZHANG Ying | 2013 | Chinese Journal Of Geochemistry2013，32，4： | 3 |
| 6 | Helium, lead and sulfur isotope geochemistry of the Gejiu Sn-polymetallic ore deposit and the s ources of ore-forming materials显示文摘Studies on the helium, lead and sulfur isotopic composition were performed of the Gejiu super-large Sn-polymetallic ore deposit. The results indicated that the ore-forming materials came from different sources and the deposit is a product of superimposed mineralization. The deposit is characterized by multi-source and multi-period mineralization, which experienced submarine hydrothermal deposition and Late Yanshanian magmatic hydrothermal mineralization. It is held that the Gejiu super-large Sn-polymetallic ore deposit is a multi-genesis deposit. | ZHANG Huan LUO Taiyi GAO Zhenmin MA Deyun TAO Yan | 2007 | Chinese Journal Of Geochemistry2007，26，4： | 1 |
| 7 | Early Silurian Wuchuan–Sihui–Shaoguan exhalative sedimentary pyrite belt, South China: constraints from zircon dating for K-bentonite of the giant Dajiangping deposit显示文摘The Wuchuan-Sihui-Shaoguan(WSS)exhalative sedimentary pyrite belt in the southwestern part of the Qinzhou-Hangzhou(Qin-Hang)belt is the most important sulfur industry base in China.However,a wide range of metallogenetic ages spanning from Ediacaran to Devonian has been reported in the literature.This age range does not support the idea that the typical character of'coeval mineralization'in an exhalative sedimentary mineralization belt in China and worldwide.Therefore,the precise determination of mineralization ages of representative deposits is necessary to provide guides for exploration and metallogenetic models.The Dajiangping pyrite deposit is a typical example of this kind of deposits and is also the largest deposit with a proven reserve of 210 Mt.This deposit was thought to have formed in Ediacaran or Devonian.In this study,2-3 layers of 10-25 cm thick 2M1-type microcrystalline muscovite slate abruptly embedded in the No.Ⅳmassive orebody of the deposit has been identified to be low-grade metamorphic K-bentonite.A Concordia zircon LA-ICP-MS U-Pb age of 432.5±1.3 Ma(mean standard weighted deviation of concordance and equivalence=1.2;N=11)has been yielded for the low-grade metamorphic K-bentonite.This age is distinctly different from the Rb-Sr isochron age of630.1±7.3 Ma for siliceous rock at the top of the No.Ⅲbanded orebody and the Re-Os isochron age of 389±62 Ma for pyrites from a laminated orebody.Instead,it is close to the intercept age(429 Ma)of the youngest detrital zircons from sandstone interlayers of the No.Ⅲbanded orebody.The Concordia age is also coincident with those of the Late Caledonian(400-460 Ma)magmatism-metamorphism events which are widely distributed in Cathaysia Block.Particularly,it agrees well with that of the Early Silurian extensional volcanism(434-444 Ma)which have been revealed in the Dabaoshan,Siqian-Hekou,and Nanjing volcanic basins in northern Guangdong Province and southern Jiangxi Province.Hence,the dating result in this study confirms that the sedimentary time of the ore-host Daganshan Formation is Early Silurian,and implies that the mineralization age of the Dajiangping pyrite deposit should also be Early Silurian.In combination with the Early Silurian age of Shezui pyrite deposit and the Dabaoshan volcanic basin along the WSS pyrite belt,it could be inferred that the WSS pyrite belt provides a record of the northern expanding of Qinzhou-Fangcheng trough in Early Silurian and that the exhalative pyrite mineralization was triggered by the postcollisional extension of the margin of Cathaysia Block after the intracontinental collision between Cathaysia Block and Yangtze Block during Late Caledonian stage. | Yingying Zhang Taiyi Luo Tian Gan Mingzhong Zhou Xinqiao Han | 2021 | Acta Geochimica2021，40，1： | 1 |
| 8 | Genetic relation between Carlin-type gold deposits and Sedex-type base metal mineralization显示文摘GOLD mineralization and Sedex-type base metal mineralization (SBM) have been separately studied for along period. This may lead geologists to ignore the important exploration meaning of SBM in goldprospecting. A typical example is related to the Carlin-type gold ore deposits, in the study of which, Hg,As, Sb and other mineralizations have been stressed but SBM has been ignored. 1 A new phenomenon In recent years, it has been discovered that many Carlin-type gold ores and SBM are distributed inthe same geology unit but are disjunctive each other. In Carlin district of USA, Emsbo et al.have reported the Sedex-type Pb-Zn orebody in thedepth of Meikle Au deposit, the same phenomenon has been described in Screamer, Golden April, | LUO Taiyi and GAO Zhenmin Open Laborutory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China | 1999 | Chinese Science Bulletin1999，44，S2： | 1 |
| 9 | Gold redistribution in Shangmanggang red-clay gold deposit, western Yunnan Province, China显示文摘AFTER the discovery of lateritic gold deposits in the world during the 1980s, many similar oxidized golddeposits have been discovered in southern China since 1989. Because the incomplete lateritization ofthe regolith compared with the laterite, these oxidized gold deposits were called the red-clay type gold deposits by Prof. Tu Guangzhi. The Shangmanggang gold deposit is a typical representative of the red-claytype gold deposit in western Yunnan Province. 1 Geology, climate, and geomorphology The Shangmanggang red-clay gold deposit is located in Luxi region, between Zhefang and LuxiCenozoic basins along the Longling-Runli Fault trending northeast. The northwestern flank of the basinsconsists of the Proterozoic Gaoligong Group composed of greenschist to amphibolitic metamorphic | YANG Zhusen, LI Hongyang, GAO Zhenmin, LUO Taiyi, RAO Wenbo and DING Zhenju Open Laboratory of Deposit Geochemistry, Iustitute of Geoehemistry, Chinese Academy of Sciences, Guiyang 550002, China | 1999 | Chinese Science Bulletin1999，44，S2： | 1 |
| 10 | Origin of early Triassic rift-related alkaline basalts from Southwest China: age, isotope, and trace-element constraints显示文摘 | Jiawei Zhang Zhilong Huang Taiyi Luo Zhikuan Qian Ying Zhang | 2013 | International Geology Review2013，，9： | 1 |
| 11 | The continental hydrothermal sedimentary origin of the Dashui superlarge gold deposit in Gansu Province, China显示文摘THE Dashui gold mine, situated in Gansu Province of western China, is a superlarge gold deposit newlydiscovered in western Qinling erogenic belt, hosted within the Permian-Triassic limestones and dolomites,as well as Jurassic conglomerates. It has been termed Carlin-type and hot spring-type gold ore, yet its origin is enigmatic. It is characterized by the formation of sedimentary and replacement bodies of hematite-hydrothermalsiliceous rocks above and adjacent to orebodies. The orebodies themselves exhibit a variety of geometries,such as funnels, pipes, sack-like, tabular zones parallel to bedding. NWW-EW striking, nearly SNstriking and NEE-NE striking faults control the ore-fluid passages. The orebody sites and shapes arelargely controlled by the intersection of such different strike faults. The ore mineral assemblage is characteristically gold-hematite-chalcedony. The gold mineralizationand hematitization and silification are closely interrelated. Five basic ore types are recognized: laminated- | LI Hongyang~1, YANG Zhusen~1, GAO Zhenmin~1, LUO Taiyi~1, DING Zhenju~1 and YAN Shenghao~2 1. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China 2. Institute of Mineral Deposits, Chinese Academy of Geological Sciences, Beijing 100037, China | 1999 | Chinese Science Bulletin1999，44，S2： | 0 |
| 12 | Early Ordovician-Middle Silurian Subduction-Closure of the Proto-Tethys Ocean:Evidence from the Qiaerlong Pluton at the Northwestern Margin of the West Kunlun Orogenic Belt,NW China显示文摘Early Paleozoic magmatism in the West Kunlun Orogenic Belt(WKOB)preserves important information about the tectonic evolution of the Proto-Tethys Ocean.This paper reports whole-rock compositions,zircon and apatite U-Pb dating,and zircon Hf isotopes for the Qiaerlong Pluton(QEL)at the northwestern margin of WKOB,with the aim of elucidating the petrogenesis of the pluton and shedding insights into the subduction-collision process of this oceanic slab.The QEL is mainly composed of Ordovician quartz monzodiorite(479±3 Ma),quartz monzonite(467–472 Ma),and syenogranite(463±4 Ma),and is intruded by Middle Silurian peraluminous granite(429±20 Ma)and diabase(421±4 Ma).Zirconε_(Hf)(t)values reveal that quartz monzodiorites(+2.1 to+9.9)and quartz monzonites(+0.6 to+6.8)were derived from a mixed source of juvenile crust and older lower crust,and syenogranites(−5.6 to+4.5)and peraluminous granites(−2.9 to+2.0)were generated from a mixed source of lower crust and upper crust;diabases had zirconε_(Hf)(t)values ranging from−0.3 to+4.1,and contained 463±5 Ma captured zircon and 1048±39 Ma inherited zircon,indicating they originated from enriched lithospheric mantle and were contaminated by crustal materials.The Ordovician granitoids are enriched in LILEs and light rare-earth elements,and depleted in HFSEs with negative Nb,Ta,P,and Ti anomalies,suggesting that they formed in a subduction environment.Middle Silurian peraluminous granites have the characteristics of leucogranites with high SiO_(2)contents(74.92 wt.%–75.88 wt.%)and distinctly negative Eu anomalies(δEu=0.03–0.14),indicating that they belong to highly fractionated granite and were formed in a post-collision extension setting.Comparative analysis of these results with other Early Paleozoic magmas reveals that the Proto-Tethys ocean closed before the Middle Silurian and its southward subduction resulted in the formation of QEL. | Jinhong Xu Zhengwei Zhang Chengquan Wu Taiyi Luo Weiguang Zhu Xiyao Li Ziru Jin Pengcheng Hu | 2024 | Journal of Earth Science2024，35，2： | 0 |
| 13 | U–Pb zircon age of the base of the Ediacaran System at the southern margin of the Qinling Orogen显示文摘Global abrupt climate change from Marinoan snowball Earth to greenhouse Earth, recorded as cap carbonate overlain on diamictite, had shed the first light on Cambrian bio-radiation. The most documented cap carbonate sections are typical with comprehensive d13 C negative values and ubiquitous sedimentary structures, such as tepee-like, sheet-crack etc., which are associated with successive glacial eustatic variation caused by isostatic rebound in shallow-water facies. Here we report a deepwater basinal cap carbonate section with strong negative δ^(13) C values in the southern margin of the Qinling Orogen,Heyu, Chengkou County, Chongqing in China, which consists of massive dolostone with abundant carbonaceous laminae. However, it lacks the sedimentary structure as mentioned above and is overlain by thin-bedded silicious shales and cherts. A K-bentonite bed was discovered within the base of cap carbonates, about 0.7 m above the top of the Marinoan diamictite. Magmatic zircons that were separated from the K-bentonite bed yield a SIMS concordia U–Pb age of 634.1 ± 1.9 Ma(1 r, MSWDCE= 0.31,ProbabilityCE= 1.000, n = 20). The age is in good agreement with previously reported TIMS U–Pb ages for the termination of Marinoan glaciation and provides ageochronological constraint for the Ediacaran successions in the Qinling Orogen. | Lecai Xing Taiyi Luo Zhilong Huang Zhikuan Qian Mingzhong Zhou Hongtao He | 2018 | Acta Geochimica2018，37，3： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员