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New U-Pb age constraints on the upper Banxi Group and synchrony of the Sturtian glaciation in South China

Geoscience Frontiers 2017年第5期8卷 1161-1173页

作者： Gaoyuan Song Xinqiang Wang Xiaoying Shi Ganqing Jiang School of Earth Science and Resources China University of Geosciences (Beijing) Beijing 100083 China State Key Laboratory of Biogeology and Environmental Geology Beijing 100083 China Department of Geoscience University of Nevada Las Vegas NV 89154-4010 USA

The Nanhua basin in South China hosts well-preserved middle-late Neoproterozoic sedimentary and volcanic rocks that are critical for studying the basin evolution, the breakup of the supercontinent Rodinia, the nature and dynamics of the "snowball" Earth and diversification of metazoans. Establishing a stratigraphic framework is crucial for better understanding the interactions between tectonic, paleoclimatic and biotic events recorded in the Nanhua basin, but existing stratigraphic correlations remain debated, particularly for pre-Ediacaran strata. Here we report new Laser Ablation Inductively Coupled Plasma Mass Spectrometry(LA-ICPMS) U-Pb zircon ages from the middle and topmost Wuqiangxi Formation(the upper stratigraphic unit of the Banxi Group) in Siduping, Hunan Province, South China. Two samples show similar age distribution, with two major peaks at ca. 820 Ma and 780 Ma and one minor peak at ca. 910 Ma, suggesting that the Wuqiangxi sandstone was mainly sourced from Neoproterozoic rocks. Two major age peaks correspond to two phases of magmatic events associated with the rifting of the Nanhua basin, and the minor peak at ca. 910 Ma may correspond to the Shuangxiwu volcanic arc magmatism, which represents pre-collision/amalgamation subduction on the southeastern margin of the Yangtze Block. The youngest zircon group from the topmost Wuqiangxi Formation has a weighted mean age of 714.6±5.2 Ma, which is likely close to the depositional age of the uppermost Banxi Group. This age, along with the ages reported from other sections, constrains that the Banxi Group was deposited between ca. 820 Ma and ca. 715 Ma. The age of 714.6±5.2 Ma from the top of the Wuqiangxi Formation is indistinguishable with the SIMS U-Pb age of 715.9± 2.8 Ma from the upper Gongdong Formation in the Sibao village section of northern Guangxi, South China. It is also, within uncertainties, overlapped with two TIMS U-Pb ages from pre-Sturtian strata in Oman and Canada. These ages indicate that th

关键词： Nanhua basin Wuqiangxi Formation Banxi Group U-Pb zircon ages Sturtian glaciation South China

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New SHRIMP U-Pb age from the Wuqiangxi Formation of Banxi Group:Implications for rifting and stratigraphic erosion associated with the early Cryogenian (Sturtian) glaciation in South China

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Science China Earth Sciences 2008年第11期51卷 1537-1544页

作者： ZHANG ShiHong JIANG GanQing DONG Jin HAN YiGui WU HuaiChun State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesBeijing 100083China Department of Geoscience University of NevadaLas VegasNevada 89154-4010USA

In South China, the Wuqiangxi Formation of the Banxi Group and its equivalents underlie the early Cryogenian (Sturtian) glacial deposits but their thickness varies from 2000 m. In the Guzhang section of western Hunan, the Wuqiangxi Formation is only 152 m thick, and an ash bed 58 m below the glacial diamictite yielded a SHRIMP U-Pb age of 809.3±8.4 Ma. In contrast, 90 km south of the Guzhang section towards the basin in Zhijiang area where the Wuqiangxi Formation is ～2200 m thick, an age of 725±10 Ma has been reported from the top of this unit, 300 m below the glacial diamictite. These ages provide new evidence for the regional stratigraphic correlation across the Nanhua basin, and suggest unusually large (>2 km) stratigraphic erosion potentially associated with the Sturtian glaciation in South China. The magnitude of erosion may imply significant uplifting and tectonotopography at the onset of the Sturtian glaciation.

关键词： Neoproterozoic Banxi Group SHRIMP U-Pb age Sturtian glaciation South China

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Late Cryogenian glaciation in South Australia:Fluctuating ice margin and no extreme or rapid post-glacial sea-level rise

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Geoscience Frontiers 2019年第4期10卷 1397-1408页

作者： George E.Williams Victor A.Gostin Department of Earth Sciences University of Adelaide

Postulated extreme sea-level rise of up to 1-1.5 km with the late Cryogenian Ghaub deglaciation in Namibia is contentious,as is the great rapidity(<104 yr)of the sea-level *** extreme glacioeustatic events,if real,wou... 详细信息

Postulated extreme sea-level rise of up to 1-1.5 km with the late Cryogenian Ghaub deglaciation in Namibia is contentious,as is the great rapidity(glaciation indicate a fluctuating ice *** latter stage of the Elatina glaciation and the immediate post-glacial environment are examined here for evidence of extreme and rapid sea-level *** the central Adelaide Rift Complex,diamictite with faceted and striated clasts occurs at the top of the Elatina Formationglaciation and deposition of the Nuccaleena cap carbonate,and three palaeomagnetic polarity chrons identified in the cap carbonate imply slow deposition spanning 10^5-10^6 *** is supported by independent evidence from magnetic chronostratigraphy for Ediacaran strata in South Australia and Califo

关键词： Late Cryogenian glaciation Sea level Adelaide Rift Complex Elatina Formation Nuccaleena Formation

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Lower Carboniferous carbon isotope stratigraphy in South China: Implications for the Late Paleozoic glaciation

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Science China Earth Sciences 2011年第1期54卷 84-92页

作者： QIE WenKun ZHANG XiongHua DU YuanSheng ZHANG Yang State Key Laboratory of Geological Process and Mineral Resources China University of Geosciences Wuhan 430074 China Key Laboratory of Biogeology and Environmental Geology of Ministry of Education China University of Geosciences Wuhan 430074 China

Studies on carbon isotopes of bulk carbonates from Longan and Baping sections of Lower Carboniferous in Guangxi of China show that the stable carbon isotope compositions in carbonate rocks of the isolated platform and deep slope facies were resistant to the influence of early meteoric diagenesis and late burial diagenesis. Three major positive carbon isotope excursions have been recognized in Lower Carboniferous in South China. The first major positive δ3C shift of 4.19‰ occurred in the middle part of Siphonodella isosticha-upper Siphonodella crenulata zone （Tournaisian）; the second with an amplitude of 4.65‰ occurred near the Tournaisian/Visean boundary; and the third of 2.23‰ in the lower part of Gnathodus bollandensis zone. The three positive shifts of δ3C can be correlated with global carbon isotope excursions and are consistent with the fall in global sea level, indicating that abundant organic carbon burial, lowering of atmospheric CO2, and glaciation may have occurred during these time intervals.

关键词： Carboniferous glaciation carbon isotope Guangxi South China

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Climate instability in the Yili region, Xinjiang during the last glaciation

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Chinese Science Bulletin 2000年第17期45卷 1604-1609页

作者： YE Wei, DONG Guangrong, YUAN Yujiang & MA Yingjie1. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China 2. Department of Geography, Zhejiang Normal University, Jinhua 321004, China 3. Institute of Desert Research, Chinese Academy of Sciences, Lanzhou 730000, China 4. Xinjiang Institute of Meteorological Research, Urumqi 830002, China Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi China Department of Geography Zhejiang Normal University Jinhua China Institute of Desert Research Chinese Academy of Sciences Lanzhou China Xinjiang Institute of Meteorological Research Urumqi China

The climate is influenced by westerlies year in year out and the aeolian loess is widespread in the Yili region, the Xinjiang Uygur Autonomous Region. Through the study of the loess section with a thickness of 21.5 m, much useful information about climatic change in this region during the last glaciation was gotten. Grain size analysis of loess samples in the section showed that the climatic change in the Yili region was of instability during the last glaciation and similar to those of the North Atlantic Ocean and Greenland. In correspondence with the Heinrich events, the percentage of the size fraction of loess with grain size less than 10 μm decreased in cold stadials in the Yili region. This result suggests that the westerly wind be strengthened during the cold periods. Compared with the stadials, the content of the loess with grain size less than 10 μm was increased in interstadials, which indicated that the strength of the westerly wind was weakened. It is obvious that the climate was instable

关键词： Yili region last glaciation climate instability.

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Climatic instability record during the Penultimate glaciation: Evidence from Huining loess

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Chinese Science Bulletin 1997年第20期42卷 1720-1723页

作者： Ren, JZ Ding, ZL Liu, DS Quan, H China Japan Friendship Ctr Environm Protect Open Lab Beijing 100029 Peoples R China

THE investigations of past global changes reveal strong climatic instability during the lastglaciation. Most terrestrial palaeoclimate records have not given climatic conditionclues in the Penultimate glaciation. It is very necessary for us to know whether the climaticinstability picture is a particular phenomenon occurring only in the last glacial period. In

关键词： China Loess Penultimate glaciation climatic instability.

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QUATERNARY glaciation SERIES ANDGLACIAL LANDFORM IN GONGWANG MOUNTAINS INNORTHEAST PART OF YUNNAN PROVINCE, CHINA

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Chinese Geographical Science 1997年第2期7卷 180-190页

作者：况明生 Department of Geography Southwest China Normal University Chongqing P. R. China

The Gongwang Mountains is situated in the northeast part of Yunnan Plovince. In the mountain, glaciation once occirred above 3100 m a. s. l. in the Quaiernary. The typical glacial remains are mainly concentrated in Jiaozishan - and Yaojingtang - Niudongping area. The glacial landforms were mainly cirque, trough valley and lateral moraine. Glacial type was alpine cirque glacier and according to morphogenetic relation of the glacial landforms, the Quaternary glaciation should be separated into two periods: last glaciation (containing two stages of late and maximum glaciation) and penultimate in the Gongwang Mountain in northeast part of Yunnan Province of China.

关键词： remains of glacier, the Quaternary glaciation series the Gongwang Mountains, Yunnan Province

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NEW PROGRESS ABOUT CHRONOLOGICAL STUDIES OF QUATERNARY glaciation IN QINGHAI-XIZANG PLATEAU

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Chinese Science Bulletin 1991年第6期36卷 482-486页

作者：郑本兴焦克勤李世杰刘嘉麒 Lanzhou Institute of Glaciology and Geocryology Academia Sinica Lanzhou 730000 PRC Institute of Geology Academia Sinica Beijing 100029 PRC

In Qinghai-Xizang Plateau 3—4 Quaternary glaciations were reconstructed. They are mainly based on the tectonic geomorphological and climatic cycles and the stratographic comparison. However, the absolute ages of tills are not enough. In 1985—1987 we investigated West Kunlun Mountains and obtained a series of dating data of till and Quaternary stratum since the Pleistocene.

关键词： Quaternary glaciation interglaciationchronological sequence.

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LAST glaciation AND MAXIMUM glaciation IN THE QINGHAI-XIZANG (TIBET) PLATEAU: A CONTROVERSY TO M. KUHLE,S ICE SHEET HYPOTHESIS

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Chinese Geographical Science 1992年第4期2卷 3-21页

作者：施雅风郑本兴李士杰 Lanzhou Institute of Glaciology and Geocryology CAS Lanzhou 730000 PRC

Since the late 1950’s, many Chinese scientists have explored the remains of the Quaternary glaciation in the Qinghai-Xizang (Tibet) Plateau and its surrounding mountains. In the main, 3-4 glaciations have been recognized. The largest one occurred in the Late Middle Pleistocene with piedmont glaciers, ice caps and trellis valley glaciers in many high peak regions. But here is no evidence of a unified ice sheet covering the whole plateau as described by M. Kuhle. Due to the further uplifting of the Himalayas and Qinghai-Xizang Plateau the climate became progressively drier, diminishing the extension of glaciers during the Late Pleistocene. The elevation of the snow line during the Last glaciation was about 4,000 m on the south, east and northeast edges of the plateau and ascended to 5500 m on the hinder northwest of the plateau. The thermal effect of the big plateau massif, the sharp increase of aridity from the southeast rim to the northwest inland area and the abrupt decrease of precipitation during

关键词： Quaternary glaciation dispersed mountain glaciers the Qinghai-Xizang Plateau

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Geomorphologic Structure, Characteristics and Processes in the Cangshan Mountains: Explanations for the Formation and Development of the Dali glaciation

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International Journal of Geosciences 2011年第2期2卷 155-163页

作者： Ye Wan Kaidao Fu Yong Liu Zhengtao Shi 不详

The area around Cangshan Mountain, located on the southeastern fringes of the Tibetan Plateau, is a key region in terms of revealing the processes involved in the uplifting of the Tibetan Plateau, plus its environmental effects. Based on systemic field and laboratory work, this study uncovers the step-like geomorphologic structure, characteristics and processes revealed in the Cangshan Mountain area, to argue for the formation and development of the Quaternary glaciation there. The results indicate that there were two paleo-glaciations in the area, which were the early and late Dali glaciations, and that these occurred during the time periods 5.76 × 104 aBP and 1.6 × 104 aBP respectively, being the southernmost paleo-glaciations to have taken place in China. Two step-like paleo-planation surfaces were formed vertically at the mountain (that is, at the summit of Cangshan, which is 3800 to 4000 m above sea level (a.s.l) in height;and at the paleo-glacial and peri-glacial active zones: 3700 to 3900 m a.s.l. in height). Meanwhile three widespread erosion surfaces can be identified at about 2900 to 3500 m, 3000 to 3100 m and 2450 to 2550 m a.s.l. in height;three fluvial fans developed on the landform at about 2250 to 2200 m, 2200 to 2150 m and 2150 to 2100 m a.s.l. in height respectively, and lacustrine relief developed surrounding the Erhai Lake.

关键词： The Dali glaciation Step-Like Landform Cangshan Mountain

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