NIGPAS OpenIR中国科学院南京地质古生物研究所http://ir.nigpas.ac.cn:802024-03-19T07:49:06Z2024-03-19T07:49:06Z<i>Secrospiroxylon</i><i> tolgoyensis</i> gen. nov. et sp. nov., a unique coniferous stem from the uppermost Permian of the South Gobi Basin, Mongolia, and its palaeoclimatic, palaeoecophysiological, and palaeoecological implicationsCai, Yao-FengZhang, HuaFeng, ZhuoZhang, Yi-ChunYuan, Dong-XunXu, Hai-PengByambajav, UugantsetsegYarinpuil, AriunchimegShen, Shu-Zhonghttp://ir.nigpas.ac.cn:80/handle/332004/432522024-03-14T07:39:40Z2024-03-14T07:39:40Z题名: <i>Secrospiroxylon</i><i> tolgoyensis</i> gen. nov. et sp. nov., a unique coniferous stem from the uppermost Permian of the South Gobi Basin, Mongolia, and its palaeoclimatic, palaeoecophysiological, and palaeoecological implications
作者: Cai, Yao-Feng; Zhang, Hua; Feng, Zhuo; Zhang, Yi-Chun; Yuan, Dong-Xun; Xu, Hai-Peng; Byambajav, Uugantsetseg; Yarinpuil, Ariunchimeg; Shen, Shu-Zhong
摘要: A permineralised tree stem, Secrospiroxylon tolgoyensis Y.CAI, H.ZHANG et FENG gen. nov et sp. nov., is described from the uppermost Permian in the Tsaagan Tolgoy section of the South Gobi Basin, Mongolia. The coniferous stem is unique for combining a heterocellular pith, an endarch primary xylem, and a Prototaxoxylon-type secondary xylem. Growth rings are inconspicuously present in the studied stem, whereas false rings are commonly present throughout the secondary xylem, indicating ecophysiological anatomical responses to continuous environmental turbulence under indistinctive seasonal climatic conditions during the latest Permian. Arthropod wood borings with two coprolite classes are recognised, speculated to originate from detritivorous oribatid mites. In addition, fungal hyphae and white-rot decay structures are commonly identified in the stem. Our study provides novel information on the diversity of the Angaran flora and additional information on climatic and environmental fluctuations, as well as fungus-plant-arthropod interactions in the terrestrial ecosystems of the latest Permian of southern Mongolia.2024-03-14T07:39:40ZModeling hyperthermal events in the Mesozoic-Paleogene periods: a reviewZhang, YinggangMills, Benjamin J. W.He, TianchenHu, XiumianZhu, Maoyanhttp://ir.nigpas.ac.cn:80/handle/332004/432502024-03-14T07:39:39Z2024-03-14T07:39:39Z题名: Modeling hyperthermal events in the Mesozoic-Paleogene periods: a review
作者: Zhang, Yinggang; Mills, Benjamin J. W.; He, Tianchen; Hu, Xiumian; Zhu, Maoyan
摘要: Hyperthermal events, which are characterized by rapid and extreme warming, occurred at several points throughout the Mesozoic to Paleogene periods. Model simulation studies have been conducted to investigate the mechanisms behind these events, including the carbon fluxes required to drive observed warming and isotope dynamics, the impact of warming on continental weathering, seawater pH, ocean anoxia, and the mechanism that terminated the warming. Studies using simple box models, Earth system box models, or 3D Earth system models have suggested that warming had a significant biogeochemical impact and would enhance continental weathering, increase ocean anoxia, and drive marine acidification. However, the magnitudes of these impacts remain debated and require further modeling work, as do the reconstructions of carbon fluxes and compositions. This review provides an overview of the current state of knowledge on hyperthermal events and proposes possible modeling development directions to better understand the causes and impacts of these events. Particularly, new long-term 'semi-spatial' Earth system models are promising tools for providing new solutions and perspectives on the biogeochemical responses to warming events and the carbon fluxes behind hyperthermal events from the Mesozoic to Paleogene periods.2024-03-14T07:39:39ZHigh-resolution geochronology of sedimentary strata by U-Pb CA-ID-TIMS zircon geochronology: A reviewWang, TiantianRamezani, JahandarYang, ChuanYang, JianghaiWu, QiongZhang, ZhihuiLv, DaweiWang, Chengshanhttp://ir.nigpas.ac.cn:80/handle/332004/432482024-03-14T07:39:39Z2024-03-14T07:39:39Z题名: High-resolution geochronology of sedimentary strata by U-Pb CA-ID-TIMS zircon geochronology: A review
作者: Wang, Tiantian; Ramezani, Jahandar; Yang, Chuan; Yang, Jianghai; Wu, Qiong; Zhang, Zhihui; Lv, Dawei; Wang, Chengshan
摘要: Sedimentary rocks are one of the most abundant repositories of Earth history, preserving records of climate change, tectonic events, atmospheric and hydrospheric chemistry, and biological evolution in deep time. A precise and accurate temporal framework for the sedimentary rocks is indispensable to investigating the phenomena, linkages, cause and effect relationships, and rates of processes and events in Earth history. The U-Pb radioisotopic system in U-bearing accessory minerals analyzed by the isotope dilution thermal ionization mass spectrometry (ID-TIMS) technique offers one of the most precise and accurate means of measuring absolute time in the geologic past. The magmatic mineral zircon is particularly useful for its mechanical and chemical persistence and is the most commonly used accessory mineral for U-Pb ID-TIMS geochronology. Nevertheless, the application of this technique to the stratigraphic record relies on the presence of relatively pure volcanic ash (tuffaceous) deposits mixed in - or interbedded with - sedimentary rocks of interest. Innovations in modern U-Pb ID-TIMS geochronology over the past three decades have allowed great improvements in precision and reproducibility, with analytical uncertainties approaching similar to 0.2 parts per thousand in calculated ages of analyzed samples. Simultaneously, the quest for higher precision and resolving power of geochronology has elucidated new sources of complexity in the U-Pb systematics of minerals that now result in previously undetectable dispersals of analyses. These complexities must be recognized and carefully treated by appropriate analytical and statistical methods before a measured date can be translated into a meaningful depositional age. The application of Bayesian statistics allows stratigraphic uncertainties to be objectively incorporated in age-stratigraphic models. Limitations due to paucity of datable ash beds can be overcome by integrating radioisotope geochronology with other stratigraphic time markers, such as carbon isotope excursions, geomagnetic polarity reversals and orbitally-driven sedimentary cyclicity.2024-03-14T07:39:39ZMicrobial origin of micrites in ooids: evidence from the Cambrian in North ChinaZhang, ZhenWang, MinQi, Yong-anLiu, Bingchenhttp://ir.nigpas.ac.cn:80/handle/332004/432462024-03-14T07:39:38Z2024-03-14T07:39:38Z题名: Microbial origin of micrites in ooids: evidence from the Cambrian in North China
作者: Zhang, Zhen; Wang, Min; Qi, Yong-an; Liu, Bingchen
摘要: Ooids are common and important type of carbonate rock grain, and although they have a long development history, their origin has not been determined. In recent years, increasing evidence has supported the microbial mechanism of ooids. In this paper, we used polarized microscopy, fluorescence microscopy, cathodoluminescence microscopy, and scanning electron microscopy to investigate the microbial origin of the micrites in ooids from the Cambrian Miaolingian Series, North China. Many Girvanella filaments have been preserved in the cores, and cortexes of some ooids, as well as irregular agglomerates or clots among ooids. These Girvanella fossils indicate that filamentous cyanobacteria played an important role in the formation of the micrite in ooids, especially in the cortices of giant ooids. In addition, seven types of extracellular polymeric substance mineralization fabrics (i.e., nanospherical, sheet like, lumpy, rod like, tube meshwork like, honeycomb like, and fibrous) are preserved in the micrites in ooids from the Cambrian Miaolingian Series, North China. The cyanobacterial filaments and various types of microbial mineralization fabrics indicate that the autochthonous micrites in ooids are the result of microbial mineralization of organic matter and may also provide an important evidence for the microbiological genesis of ooids.2024-03-14T07:39:38ZVolcanic Age and Geochemistry of the Permian Linxi Formation in Northeast China: Implications for the Tectonic Evolution of the Paleo-Asian OceanZhang, HaihuaZhang, HuaShen, ShuzhongZhao, ZifuQiu, LiangChen, ShuwangZhang, JianGong, FanhaoLi, YongfeiZheng, YuejuanSun, ShouliangZhang, Yujinhttp://ir.nigpas.ac.cn:80/handle/332004/432442024-03-14T07:39:38Z2024-03-14T07:39:37Z题名: Volcanic Age and Geochemistry of the Permian Linxi Formation in Northeast China: Implications for the Tectonic Evolution of the Paleo-Asian Ocean
作者: Zhang, Haihua; Zhang, Hua; Shen, Shuzhong; Zhao, Zifu; Qiu, Liang; Chen, Shuwang; Zhang, Jian; Gong, Fanhao; Li, Yongfei; Zheng, Yuejuan; Sun, Shouliang; Zhang, Yujin
摘要: The tectonic evolution of the Paleo-Asian Ocean (PAO) has been well studied, including its gradual narrowing and closure by subduction. However, aspects of the tectonic evolution of the oceanic domain remain unclear, including the exact timing and nature of the closure. The Central Asian Orogenic Belt (CAOB) was formed by the closure of the PAO and, therefore, contains information about the tectonic evolution of the oceanic domain. Here, we report a study of the petrology, geochronology, and geochemistry of the Taohaiyingzi section of the Permian Linxi Formation in Alukhorqin Banner (Northeast China) in the central part of the CAOB. A newly discovered andesitic tuff from the lower part of the Linxi Formation yields a weighted mean Pb-206/U-238 age of 262.2 +/- 1.1 Ma (n = 87), indicating that the lower part of the Linxi Formation of the Taohaiyingzi section was deposited during the late Guadalupian. Provenance weathering indicators show that the sedimentary rocks of the Linxi Formation are of low maturity. Element geochemical characteristics indicate that the Linxi Formation clastic rocks were derived from eroded magmatic rocks that formed in a continental arc setting and were deposited close to the arc in a continental arc basin environment. The active margin setting was generated by the subduction of the paleo-Asian oceanic plate beneath the Xilinhot-Songliao block. The inferred palaeosalinity of the sedimentary environment changed gradually from brackish to fresh water, suggesting the end of oceanic plate subduction during the late Guadalupian, and the closure of the PAO during or after the Lopingian.2024-03-14T07:39:37Z古新世—始新世极热事件(PETM)的陆相记录:现状与展望罗星宇王平罗才蓉吕苗李善营魏晓椿http://ir.nigpas.ac.cn:80/handle/332004/432422024-03-14T07:39:37Z2024-03-14T07:39:37Z题名: 古新世—始新世极热事件(PETM)的陆相记录:现状与展望
作者: 罗星宇; 王平; 罗才蓉; 吕苗; 李善营; 魏晓椿
摘要: 古新世—始新世极热事件(Paleocene—Eocene thermal maximum, PETM)是发生在古新世与始新世界线附近的一次全球快速增温事件。研究显示,PETM期间全球大气CO_2浓度增加,温度上升,陆地水循环加强,在陆地和海洋中产生了一系列生物—环境响应。目前,PETM研究主要集中在海相地层中,而针对陆相地层的相关报道并不多见。陆相沉积速率较快,沉积地层厚度大,并且保存有丰富的哺乳动物化石和植物孢粉,也适合开展高分辨率古气候研究。本文对北美、欧洲西部和我国典型陆相盆地的PETM研究成果进行了系统性综述,对比分析结果表明,PETM期间陆相地层中的碳同位素偏移过程可以分为快速负偏、保持低值和缓慢恢复三个阶段。陆地植物和哺乳动物在PETM期间并未经历大规模灭绝,反而通过进化、扩散和局部灭绝适应了快速变化的环境。基于最新的研究方法,包括碳酸盐岩U-Pb定年、汞同位素以及团簇同位素,对我国未来的PETM陆相记录研究提出了展望。2024-03-14T07:39:37ZA new species of Pimplinae (Hymenoptera: Ichneumonidae) from the Oligocene of Huatugou area, Qaidam Basin, Tibetan Plateau, ChinaDai, YanzhiZhao, JialeYang, TaoCai, JiahaoLi, XujunXie, ChengHan, LeiChen, HongyuLi, WenjiaXie, SanpingYan, Defeihttp://ir.nigpas.ac.cn:80/handle/332004/432402024-03-14T07:38:16Z2024-03-14T07:38:16Z题名: A new species of Pimplinae (Hymenoptera: Ichneumonidae) from the Oligocene of Huatugou area, Qaidam Basin, Tibetan Plateau, China
作者: Dai, Yanzhi; Zhao, Jiale; Yang, Tao; Cai, Jiahao; Li, Xujun; Xie, Cheng; Han, Lei; Chen, Hongyu; Li, Wenjia; Xie, Sanping; Yan, Defei
摘要: A new species Theronia qaidamensis sp. nov. (Ichneumonidae, Pimplinae) is described from the Oligocene Shangganchaigou Formation of the northwestern Qaidam Basin (Huatugou area), northeast of the Tibetan Plateau (TP). The new species represents the first report of the Ichneumonidae from the Qaidam Basin, which reveals an insect linkage between the Qaidam Basin and Europe. In addition, the study of associated fossils from the Shangganchaigou Formation shows that the palaeoenvironment of the northwestern Qaidam Basin during the Oligocene was warm and moist, which provided suitable living conditions for the current fossil.2024-03-14T07:38:16ZThe rare earth elements of sequentially leached phases in the loess-paleosol sequence at Weinan on the southeastern Chinese Loess PlateauLi, TaoLiu, YijieYang, RuiyuChen, TianyuLi, Gaojunhttp://ir.nigpas.ac.cn:80/handle/332004/432372024-03-14T07:38:15Z2024-03-14T07:38:15Z题名: The rare earth elements of sequentially leached phases in the loess-paleosol sequence at Weinan on the southeastern Chinese Loess Plateau
作者: Li, Tao; Liu, Yijie; Yang, Ruiyu; Chen, Tianyu; Li, Gaojun
摘要: The rare earth elements (REEs) in loess sediments may preserve key information of paleoenvironmental changes in East Asia but remain poorly explored. Here we present the REE compositions of sequentially leached phases of loess sediments from a 16 m long loess-paleosol sequence collected from Weinan at the southern margin of the Chinese Loess Plateau (CLP). The REEs associated with carbonates, easily reducible oxides, reducible oxides, clay minerals, and the residual silicate minerals were sequentially leached with Na-acetate, hydroxylamine-HCl, Nadithionite/Na-citrate, 12 mol L-1 HCl and concentrated HF-HNO3 solutions. The results show that the REE concentrations of different phases vary in the loess-paleosol layers and are most enriched in the easily reducible phase (except for the residual phase), which is likely explained by the association of REEs with Mn-oxides. Significant Eu anomalies can only be found in the carbonate and easily reducible phases, with the carbonate phase being characterized by appreciable positive Eu anomalies and the easily reducible phase being characterized by negative Eu anomalies, indicating the incorporation of Eu2+ into secondary carbonates that leaves the authigenic Mn-oxides with depleted Eu relative to other REEs. The carbonate phase shows significant negative Ce anomalies, which is likely due to the preferential removal of Ce4+ by Mn oxides before the formation of secondary carbonates. Nevertheless, appreciable positive Ce anomalies for the easily reducible phase can only be found at the bottom of the paleosol S1 while significant negative Ce anomalies were found within the paleosol S1, indicating the downward leaching of Ce4+ that shows stronger complexation with the organic matters than REE3+ in the soil solution. This may partly account for the negative Ce anomalies previously found in the paleosols. Overall, our results suggest a two-stage evolution of Eu and Ce anomalies of the carbonate phase, with the first stage controlled by the formation of both Mn-oxides and secondary carbonates and the second stage dominated by the precipitation of secondary carbonates. The comparison of carbonate Eu and Ce anomalies with other paleoclimatic proxies indicates that the combination of Eu and Ce anomalies of the carbonate fraction of loess may be applied as novel proxy records of climate change in East Asia.2024-03-14T07:38:15ZGlobal sea-level fall triggered Ediacaran-Cambrian unconformity in North China cratonSun, YunpengOuyang, QingLang, XianguoPang, KeWu, ChengxiChen, ZheZhou, Chuanminghttp://ir.nigpas.ac.cn:80/handle/332004/432342024-03-14T07:38:13Z2024-03-14T07:38:13Z题名: Global sea-level fall triggered Ediacaran-Cambrian unconformity in North China craton
作者: Sun, Yunpeng; Ouyang, Qing; Lang, Xianguo; Pang, Ke; Wu, Chengxi; Chen, Zhe; Zhou, Chuanming
摘要: The Great Unconformity that separates the Cambrian and the underlying Proterozoic strata has been interpreted as recording a composite of multiple diachronous unconformities, among which the Ediacaran-Cambrian unconformity represents the last stage of these erosional processes. Whilst the major denudational episode of the Great Unconformity was strictly restricted to happen before or during the Cryogenian and considered to be associated with the Rodinia supercontinent cycle and "Snowball Earth" event, the cause(s) for the relatively temporary exhumation in late Neoproterozoic remains elusive. Here we present a synthetic geochronological study for the late Ediacaran to early Cambrian strata on the southern North China craton (NCC), where the Ediacaran-Cambrian unconformity occurs. The absence of the latest Ediacaran to earliest Cambrian age zircons of these strata may suggest a significant tectonic quiescence in NCC. A similar phenomenon can also be recognized in other blocks isolated from the Gondwanaland during the late Neoproterozoic-early Cambrian interval. This world-wide Ediacaran- Cambrian unconformity thus was more likely caused by a global sea-level fall, possibly associated with the assembly of the Gondwana supercontinent during the Precambrian-Cambrian transitional period.(c) 2023 Elsevier B.V. All rights reserved.2024-03-14T07:38:13ZA new genus and species of Stenoviciidae (Insecta: Hemiptera) from the Upper Permian of New South Wales, AustraliaTang, YingshunZhang, QianqiBeattie, RobertWang, Bohttp://ir.nigpas.ac.cn:80/handle/332004/432312024-03-14T07:38:12Z2024-03-14T07:38:12Z题名: A new genus and species of Stenoviciidae (Insecta: Hemiptera) from the Upper Permian of New South Wales, Australia
作者: Tang, Yingshun; Zhang, Qianqi; Beattie, Robert; Wang, Bo
摘要: A new genus and species of Stenoviciidae, Pseudostenovicia evansi, is established and described based on a tegmen from the Upper Permian Belmont insect bed of Newcastle coal measures of New South Wales, Australia. There are nine species within nine genera of family Stenoviciidae, seven of which were found in the same stratum and locality. The new species can be distinguished from other species by its three-branched MP, crossvein m-cu almost in the same line with basal part of vein CuA1. The new species increases the diversity and provides more tegminal information of the family Stenoviciidae.2024-03-14T07:38:12Z