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| 1 | 湖北宜昌寒武系水井沱组页岩气藏主控地质因素和富集模式显示文摘湖北宜昌地区埃迪卡拉纪—寒武纪界线附近地层格架显示宜昌地区埃迪卡拉纪晚期—早寒武世时期的构造古地理格局具有隆、凹相间的特点。凹陷区是寒武系水井沱组下段富有机质页岩发育的有利区带。凹陷区内水井沱组下段页岩微量元素V/Cr、Ni/Co、V/(V+Ni)的比值和化学蚀变指数(CIA)指示水井沱组下段页岩总体上形成于缺氧或硫化环境,但自下而上氧化还原条件有逐步改善的趋势。与氧化还原环境变化对应,出现了总有机碳(TOC)和生源钼(Moxs)的同步减小,证明TOC受氧化还原环境和海底有机碳通量的双重影响。TOC与Moxs的相关性明显高于TOC与生源镍(Nixs)的相关性,据此,并结合同期地层有机碳同位素组成特征,推测寒武纪早期海底可能发生了天然气水合物的溶解和甲烷释放。宜昌地区寒武系水井沱组页岩TOC与页岩的含气量、石英和黄铁矿等脆性矿物含量的高度相关性证明TOC是页岩气储层品质评价的最重要参数之一,具有相对较高TOC含量的水井沱组下段中—下部无疑是水井沱组页岩气的最优质储层。宜昌地区海相地层埋藏演化史研究,揭示宜昌地区下寒武统储层中的有机质在晚三叠世中期进入生气高峰之后,再未发生二次生烃,黄陵隆起及其演化有效防止了有机质的过度热演化和页岩气储层的破坏。寒武系水井沱组页岩气富集受控于总有机碳含量和黄陵隆起及其演化。 | 陈孝红 危凯 张保民 李培军 李海 刘安 罗胜元 | 2018 | 中国地质2018，45，2： | 61 |
| 2 | 峡东青林口地区新元古代地层序列及沉积演变显示文摘峡东地区的新元古界由于保存良好的'雪球地球'沉积记录及其崩解后的'盖帽碳酸盐岩'和'庙河生物群'等关键地质记录,因而成为国际新元古界研究的热点地区之一.此次报道的青林口剖面是目前在峡东地区发现的出露最为完整的新元古代地层序列,对于揭示这一关键地质时期的重大生物演变和地球环境发展历程具有重要研究价值.重点介绍该剖面的地层序列并简要分析其沉积演变特点.该剖面出露新元古代地层自下而上依次包括莲沱组、南沱组、陡山沱组和灯影组.其中,莲沱组以紫红色砂岩夹页岩为主,由两个沉积旋回组成;南沱组角度不整合在莲沱组之上,以灰绿色杂砾岩为特征,划分为3个岩性段;陡山沱组以'盖帽白云岩'的出现为底界,以黑色硅质页岩的结束为顶界,划分为4个明显的岩性段;灯影组整体具有'两白夹一黑'的特征,自下而上划分为蛤蟆井段、石板滩段和白马沱段.青林口剖面地层出露完整,各组段岩性特征明显,清晰地反映了该区域的沉积环境演变历程.沉积记录显示,本区新元古代中期开始接受沉积,最先沉积陆相莲沱组,经历成冰纪晚期南沱组代表的'雪球'事件后转为海相沉积,埃迪卡拉纪沉积的陡山沱组和灯影组均为浅海开阔碳酸盐相或局限页岩相,成为后生动物起源和宏观藻类分异发展的创新基地. | 安志辉 童金南 叶琴 田力 宋虎跃 赵小明 | 2014 | 地球科学(中国地质大学学报)2014，39，7： | 15 |
| 3 | Progress and perspective on frontiers of geobiology显示文摘Geobiology is a new discipline on the crossing interface between earth science and life science,and aims to understand the interaction and co-evolution between organisms and environments.On the basis of the latest international achievements,the new data presented in the Beijing geobiology forum sponsored by Chinese Academy of Sciences in 2013,and the papers in this special issue,here we present an overview of the progress and perspectives on three important frontiers,including geobiology of the critical periods in Earth history,geomicrobes and their responses and feedbacks to global environmental changes,and geobiology in extreme environments.Knowledge is greatly improved about the close relationship of some significant biotic events such as origin,radiation,extinction,and recovery of organisms with the deep Earth processes and the resultant environmental processes among oceans,land,and atmosphere in the critical periods,although the specific dynamics of the co-evolution between ancient life and paleoenvironments is still largely unknown.A variety of geomicrobial functional groups were found to respond sensitively to paleoenvironmental changes,which enable the establishment of proxies for paleoenvironmental reconstruction,and to play active roles on the Earth environmental changes via elemental biogeochemical cycles and mineral bio-transformations,but to be deciphered are the mechanisms of these functional groups that change paleoenvironmental conditions.Microbes of potential geobiology significance were found and isolated from some extreme environments with their biological properties partly understood,but little is known about their geobiological functions to change Earth environments.The biotic processes to alter or modify the environments are thus proposed to be the very issue geobiology aims to decipher in the future.Geobiology will greatly extend the temporal and spatial scope of biotic research on Earth and beyond.It has great potential of application in the domains of resource exploration and global change.To achieve these aims needs coordinative multidisciplinary studies concerning geomicrobiology and related themes,database and modeling of biogeochemical cycles,typical geological environments,and coupling of biological,physical,and chemical processes. | XIE ShuCheng YIN HongFu | 2014 | Science China Earth Sciences2014，57，5： | 10 |
| 4 | 中国华南陡山沱组烃源岩的形成机制与分布预测显示文摘震旦系(埃迪卡拉系)陡山沱组是成冰系(南华系)极端冰期事件结束后首次沉积的泥岩和碳酸盐岩地层,大规模的海侵活动导致在全球广泛发育富有机质黑色页岩,可能是未来深层油气和页岩气勘探的重要烃源岩层。中国华南陡山沱组烃源岩分布广泛,由于受古构造格局、沉积相带等因素影响,烃源岩非均质性强、平面上分布差异大。本文在前人研究基础上,结合3个剖面的有机地球化学、古生物学和沉积地球化学等分析,对比华南10个典型剖面,分别对陡二段和陡四段烃源岩的沉积环境开展分析对比,认为陡二段烃源岩形成于海侵背景下的贫氧环境,陡四段烃源岩形成于海退背景下的缺氧滞留环境;多细胞藻类和疑源类是主要有机质母源。不同相带对比研究表明,台地相烃源岩主要发育在陡四段(TOC平均值为3.61%),斜坡相烃源岩在陡二段(TOC均值为2.20%)和陡四段均发育(TOC平均值为3.66%)。烃源岩质量和厚度明显受控于沉积环境和古裂陷地质结构等。结合露头和钻井资料,对华南陡山沱组烃源岩分布及厚度开展预测和编图,提出了优质烃源岩分布的有利区域,为深层油气勘探和页岩气富集区预测提供了依据。 | 朱光有 赵坤 李婷婷 张志遥 | 2021 | 地质学报2021，95，8： | 4 |
| 5 | 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 |
| 6 | 扬子地区震旦纪—寒武纪转折期大陆风化研究进展与展望显示文摘通过调研扬子地区震旦纪(埃迪卡拉纪)—寒武纪(E—C)转折期大陆风化、海洋环境和有机质富集特征研究。结果显示,扬子地区E—C转折期遭受了较强烈的化学风化作用,且在这一时期区内兼具浅水碳酸盐台地和深水盆地环境。在台地相区,下寒武统牛蹄塘组黑色岩系不整合接触于震旦系灯影组白云岩之上,该不整合与E—C转折期全球“大不整合”具有紧密的关系,盆地区发育的完整的沉积地层记录了台地区被风化地层的痕迹。现有大陆风化的地球化学证据集中于n(^(87)Sr)/n(^(86)Sr)、δ^(13)C、CIA和ε_(Nd)(t)等,同时这些地球化学数据也局限在少数的剖面和层段,因此迫切需要更多的地球化学参数来反映该风化作用的影响范围和演化特征。准确认识扬子地区E—C转折期大陆风化作用与海洋环境演变间的耦合关系,是揭示古生物演化、有机质富集机制的重要环节。 | 付勇 夏鹏 龙珍 张恭境 谯文浪 郭川 杨镇 | 2021 | 地质论评2021，67，4： | 3 |
| 7 | Early–Middle Cambrian Palynomorph Microfossils and Related Geochemical Events in South China显示文摘The earliest Cambrian acritarch ‘Asteridium–Heliosphaeridium–Comasphaeridium' assemblage and the Early Cambrian(‘Chiungchussuan') acritarch ‘Skiagia ornate–Fimbriaglomerella membranacea' assemblage in South China can be correlated with assemblages from synchronous strata elsewhere in the world. Recent geochemical study and biomarker evidence further confirm a biostratigraphic change between Cambrian Series 2 and Series 3 and support the recognition of a major geological and biotic event during this time interval. | Leiming Yin Chunjiang Wang Yuanlong Zhao Zhiji Ou | 2016 | Journal of Earth Science2016，27，2： | 2 |
| 8 | SIMS U-Pb Zircon Geochronological and Carbon Isotope Chemostratigraphic Constraints on the Ediacaran-Cambrian Boundary Succession in the Three Gorges Area, South China显示文摘The Ediacaran–Cambrian succession in South China records dramatic biological,oceanic and geochemical changes,but it is not well constrained geochronologically.This study reports a new SIMS U-Pb date of 543.4±3.5 Ma(MSWD=1.2)from a tuffaceous layer in the Zhoujiaao Section,and carbonate C-O isotopes in both Zhoujiaao and Sixi sections,Three Gorges area.This tuffaceous layer is present in the Upper Dengying Formation(i.e.,the Baimatuo Member)which is characterized by a stableδ13Ccarb plateau and the beginning of a negativeδ13Ccarb shift near its upper boundary.In accordance with the existing biostratigraphic and chemostratigraphic data,this new date corroborates that the upper boundary of the Dengying Formation in South China is approximately equivalent to the Ediacaran-Cambrian boundary(ca.541 Ma).This age also provides the minimum age of the last appearance of the Shibantan biota in the Three Gorges area,indicating that the terminal Ediacaran index fossils(e.g.,Cloudina,Sinotubulites)are not reliable stratigraphic markers for further subdivision of the uppermost Ediacaran. | Taiyu Huangc Daizhao Chen Yi Ding Xiqiang Zhou Gongjing Zhang | 2020 | Journal of Earth Science2020，31，1： | 2 |
| 9 | Paired δ^13Ccarb-δ^13Corg Evolution of the Dengying Formation from Northeastern Guizhou and Implications for Stratigraphic Correlation and the Late Ediacaran Carbon Cycle显示文摘This study provides δ^13C profiles from a lower-slope(Well ZK102)to basin(Bahuang Section)environment to better understand the temporal and spatial variability in δ^13Ccarb-δ^13Corg of the Yangtze Block during the Late Ediacaran.Our new δ^13C profiles together with the reported data suggest that the Upper Ediacaran successions from different depositional environments are generally bounded by negative δ^13Ccarb and/or δ^13Corg excursions in the underlying and overlying strata.Moreover,the Upper Ediacaran δ^13Ccarb profiles generally can be subdivided into two positive excursions and an interjacent negative excursion,whereas the paired δ^13Corg profiles from different depositional environments have individual variation trends.On the other hand,these data show a large surface-to-deep waterδ^13C gradient(~5‰variation in δ^13Ccarb,>10‰variation in δ^13Corg)which can be reasonably explained by the heterogeneity of the biological activities in the redox-stratified water column.Furthermore,the decoupled δ^13Ccarb-δ^13Corg pattern with large δ^13Corg perturbations at the lower slope precluded the existence of a large dissolved organic carbon reservoir at the Yangtze Block during the Late Ediacaran.Thus,the high δ^13Ccarb values in the Upper Ediacaran succession could be balanced by large amounts of buried organic carbon likely associated with high productivity. | Yi Ding Daizhao Chen Xiqiang Zhou Taiyu Huang Chuan Guo Rumana Yeasmin | 2020 | Journal of Earth Science2020，31，2： | 1 |
| 10 | 川东北地区晚埃迪卡拉纪灯影期海水氧化还原环境重建显示文摘晚埃迪卡拉纪全球海洋发生了大面积的缺氧,海洋化学结构呈现明显的非均质性,直接影响了埃迪卡拉型生物的演化与分布。四川盆地发育完整的晚埃迪卡拉系地层,以灯影组巨厚层碳酸盐岩沉积为代表。但是对于该套巨厚层碳酸盐岩沉积时的古海水氧化还原性质备受争议。为了解决这一问题,对川东北地区鹿池剖面的灯影组地层开展了系统的沉积学和稀土元素地球化学分析。该地区灯影组的岩石类型主要为泥微晶白云岩、黏连白云岩、叠层/层纹白云岩,以及溶蚀白云岩,沉积环境为开阔碳酸盐岩台地相。地球化学数据结果显示灯影组碳酸盐岩普遍具有较低的稀土总量(∑REE+Y值为0.4~3.3μg/g)、较低的Mn/Sr值(0.2~2.8)和较高的Fe含量(55.9~1772.6μg/g)。灯影组的REE+Y配分曲线(经页岩标准化)可划分为四个阶段,且Ce异常指示该地区经历了弱氧化到弱还原再到缺氧状态,表明埃迪卡拉纪晚期海洋浅部水体也发生了缺氧现象。 | 赵坤 满玲 贺然 李松倬 祝圣贤 郎咸国 | 2023 | 沉积学报2023，41，1： | 1 |
| 11 | 中上扬子地区震旦纪末期古海洋环境研究的若干问题显示文摘本文通过调研大量文献,系统梳理了前人关于中上扬子地区震旦纪灯影期古海洋环境特征的研究方法和主要认识,特别是关于古海水的氧化还原条件、古温度和古盐度等3个要素。结果表明,震旦纪灯影组沉积时期,中上扬子地区的古海洋是一个水深较浅、并逐渐趋于氧化的浅海水体环境;古海水温度为7.0℃-38.6℃,且在灯影组晚期升高,主要为亚热带气候;海水盐度较新元古代早期有降低的趋势,但仍为海相环境,且灯影组二段和灯影组四段时期盐度相对更大。震旦纪灯影组沉积时期的古海洋环境在地质演化历史中具有重要的时空意义,能够为解释当时地球的气候条件和生物演化等方面的重大变化提供依据。现阶段研究中的问题包括:1)缺乏同时期古海洋氧化还原环境的区域对比;2)古海水绝对深度的研究十分薄弱;3)缺乏古海水盐度的直接指示依据。建议开展高分辨率古环境指示参数垂向序列和多剖面横向对比的研究,尝试定量分析氧气浓度随古海水绝对深度的变化规律,探索指示古海水盐度的直接依据。 | 孙海涛 谢瑞 钟大康 任影 杨雪琪 钟泞聪 姜杨锦丰 | 2018 | 地质科学2018，53，2： | 0 |
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