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Stratigraphic framework and sedimentary evolution during the Cryogenian-Ediacaran transition in northeastern Sichuan Basin,South China

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Petroleum Science 2024年第2期21卷 823-835页

作者： Yi Zhang Hong-Wei Kuang Yong-Qing Liu Qiang Shi Dong-Ge Wang Ke-Ning Qi Yu-Chong Wang Da-Wei Qiao Xiao-Shuai Chen Li-Zhi Wu Meng Tian Long Chen Yi Wei Liao-Yuan Song Jian Li Zi-Gang Wu Yun-Qian Liu Xuan-Chun Liu An-Qing Chen Zhi-Wei Liao Institute of Geology Chinese Academy of Geological SciencesBeijing100037China State Key Laboratory of Coal Mine Disaster Dynamics and Control School of Resources and Safety EngineeringChongqing UniversityChongqing400044China No.205 Geological Team Chongqing Bureau of Geology and Minerals ExplorationChongqing401121China Chongqing Institute of Geological Survey Chongqing401122China Key Laboratory of Deep-time Geography and Environment Reconstruction and Applications of Ministry of Natural Resources Chengdu University of TechnologyChengdu610059SichuanChina

The northeastern Sichuan area in the northern Yangtze margin has unique Ediacaran geological records,especially the Doushantuo Formation(DST),and become a hot research area in recent ***,the Cryogenian-Ediacaran(C-E)boundary has not been precisely identified,which restricts the in-depth study of geological information during this crucial transitional period and is unfavorable for a systematic and complete understanding of the Yangtze Block and even the global paleogeographic *** study conducted stratigraphy,sedimentology,and chronostratigraphy to establish the stratigraphic framework and sedimentary evolution of the C-E transition strata in northeastern *** results showed that the Ediacaran sediments,without the cap dolomite,unconformably overlaid the Cryogenian sediments in the studied *** Member II of the DST,characterized by 50-160 m of red-green sandstone(approximately equivalent to the original Chengkou“Guanyinya Formation”),directly overlaid the Cryogenian sediments and displayed a 623±2.3 Ma maximum depositional age from the detrital zircon u-pb *** stratigraphic correlations indicate that the C-E transition strata in northeastern Sichuan had a consistent lithological association and sedimentary sequence characteristics but differed from the Three ***,the upper Nantuo massive glacial diamictites transition to the icebergs rafted lonestone-bearing mudstones at the top,then change upward to DST barrier coast *** proposed DST of the northeastern Sichuan Basin was divided into three lithostratigraphic members without the regional Member I cap dolomite:(i)Member II purple-red,gray-green sandstone strata,(ii)MemberⅢblack mudstone strata,and(iii)Member IV P-Mn bearing *** the C-E transition,the study area experienced(i)the global deglaciation stage in the terminal Marinoan glaciation and(ii)the filling-leveling up stage with clastic rocks in the early ***,the early Ediacaran

关键词： Marinoan glaciation Doushantuo formation Cap dolomite Deglacial and coastal deposits detrital zircon u-pb dating

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detrital zircon u-pb Geochronology and Lu-Hf Isotopic Compositions of the Wuliangshan Metasediment Rocks in SW Yunnan(China)and Its Provenance Implications

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Journal of Earth Science 2016年第3期27卷 412-424页

作者： Xiaowan Xing Yuejun Wang Yuzhi Zhang State Key Laboratory of Isotope Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China School of Earth Science and Geological Engineering Sun Yat-sen UniversityGuangzhou 510275China university of Chinese Academy of Sciences Beijing 100049China CAS Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100101China

The Wuliangshan Group occurs to the east of the Lancang giant igneous zone in SW Yunnan, and is mainly composed of low-grade metamorphosed sedimentary rocks. The group has been considered as the syn-orogenic product of the Baoshan with Simao-Indochina blocks. However, its depositional time and provenance remain to be poorly constrained. This paper presents zircon u-pb dating and Lu-Hf-isotopic data for five representative sandstone samples from the Wuliangshan Group. The detrital grains yield a major age-peak at ~259 Ma, and four subordinary age-peaks at ~1 859, ~941, ~788, and ~447 Ma, respectively. Our results suggest that the Wuliangshan metasedimentary sequence was deposited after Middle Triassic rather than previously-thought Cambrian. The detrital zircon age spectrum, along with in-situ Lu-Hf isotopic data suggest that the Wuliangshan Group might be a syncollisional sedimentary product related to the collision of Baoshan with Simao-Indochina blocks. It is inferred that the provenance of the Wuliangshan Group is mainly from the Simao/Yangtze blocks to the east rather than the Baoshan Block or Lancang igneous zone to the west.

关键词： detrital zircon u-pb dating Lu-Hf isotopic composition Wuliangshan sandstone sequence Middle Triassic Simao-Indochina

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detrital zircon u-pb and Hf isotopic constraints on the crustal evolution of North Korea

Detrital zircon U-Pb and Hf isotopic constraints on the crus...

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中国科学院地质与地球物理研究所2007学术年会

作者： Simon A.Wilde Department of Applied Geology.Curtin university of Technology.P O.Box u1987 Perth Western Australia 6845Australia

The crustal evolution of North Korea is poorly *** study utilises detrital zircon u-pb and Lu-Hf isotopic data, obtained from sands at the mouths of the Taedong,Chongchon and Songchon Rivers,in order to sample the Rangnim massif. These data are then used to constrain the magmatic age spectrum and crustal growth history of this *** u-pb analyses indicate that the Rangnim Massif,previously considered to be an Archean block,is characterized by～1.8Ga magmatism,with subsequent peaks at 220 and 110 *** magmatism appears to be limited,which is in marked contrast to the nearby North China Craton in terms of the timing of Precambrian events although the oldest age obtained is～*** the existence of some Mesoarchean material in North *** situ zircon Hf isotopic data show that some zircons have Hf model ages up to 4.0 Ga,suggesting a more ancient crustal *** Hf isotopic data also indicate that the～1.8Ga zircons have Archean Hf model ages,suggesting derivation from recycled Archean *** zircons are less abundant than those of Precambrian age,however,the limited data indicate that Phanerozoic magmatism mostly occurred in the Mesozoic,accompanied by significant juvenile crustal *** similarities of the crustal formation ages and～1.8 Ga thermal event between the Rangnim Massif and the North China Craton indicate that they were probably a coherent block since Archean time.

关键词： Crustal evolution Hf isotopes detrital zircon u-pb dating North Korea

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Initiation and Development of the Late Cenozoic uplift of Daluo Mountains,Northeastern Margin of the Tibetan Plateau

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Acta Geologica Sinica(English Edition) 2022年第6期96卷 1917-1931页

作者： KOu Linlin DONG Xiaopeng LI Zhenhong CuI Jiawei MA Zhaoying LI Hailong Institute of Geomechanics Chinese Academy of Geological SciencesBeijing 100081China Chinese Academy of Geological Sciences Beijing 100037China Key Laboratory of Paleomagnetism and Tectonic Reconstruction of Ministry of Natural Resources Institute of GeomechanicsChinese Academy of Geological SciencesBeijing 100081China

Daluo Mountains lie at front of the arcuate tectonic belt at the northeastern margin of the Tibetan Plateau,and are the landform boundary zone between the active Tibetan Plateau and the stable North China *** of the late Cenozoic uplift evolution of Daluo Mountains is important for understanding the expansion mechanism of the northeastern margin of the Tibetan Plateau and its influence on the western North China *** this study,the late Cenozoic uplift of Daluo Mountains is constructed from the development of the late Cenozoic alluvial fan around Daluo *** entire sedimentary sequence and framework of the fan was revealed by the newly obtained drilling core *** cosmogenic nuclide,optically stimulated luminescence,and detrital zircon u-pb dating results provide new evidences for discussion about the initial timing of the late Cenozoic uplift of Daluo Mountains and the key stages of uplift during the *** late Cenozoic alluvial fan at front of Daluo Mountains overlies a set of fluvial-facies strata;therefore,development of the alluvial-fan marks the start of late Cenozoic uplift of Daluo *** timing of this event can be constrained to~4.64 *** extensive gravel layers(dated to ca.0.76–0.6 Ma and~0.05 Ma)developed during the Pleistocene,indicating two episodes of considerable *** study provides a new time scale for the uplift and expansion of the arcuate tectonic belt at the northeastern margin of the Tibetan Plateau.

关键词： alluvial fan cosmogenic nuclide dating optically stimulated luminescence dating detrital zircon u-pb dating Daluo Mountains Tibetan Plateau

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