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| 1 | 米仓山地区早寒武世仙女洞组沉积物源新认识:沉积学、重矿物和碎屑锆石年代学的证据显示文摘长期以来,一直认为米仓山地区早寒武世地层主要由汉南古陆和/或摩天岭古陆提供沉积物,实际并非如此。米仓山地区早寒武世仙女洞组主要由鲕粒灰岩以及角砾灰岩等组成。本文根据沉积相时空展布、交错层理恢复的物源方向、重矿物以及碎屑锆石LA-ICP-MS U-Pb测年,综合探讨仙女洞组的物源方向以及物源区。沉积相时空展布和古流向表明,仙女洞组的物源主要来自西北和西南方向,非前人判断沉积物来自东北和/或西北方向。碎屑重矿物锆石、磷灰石、白钛石、铬尖晶石和磁铁矿组合表明物源主要来自于岩浆岩,部分为基性岩浆岩。对仙女洞组3件样品碎屑锆石U-Pb年龄分析,获得172组U-Pb有效年龄。碎屑锆石的谐和年龄表明,物源主要集中在744~896Ma和1755~2493Ma。综合相展布、古水流、重矿物组合以及碎屑锆石测年,仙女洞组的物源主要来自:(1)西北方向,摩天岭古陆的碧口群、横丹群和鱼洞子群的火山-沉积岩以及新元古代侵入岩;(2)西南方向,主要为康滇古陆的花岗岩、流纹岩、辉绿岩等。 | 张英利 贾晓彤 王宗起 陈木银 | 2018 | 地质学报2018，92，9： | 9 |
| 2 | 川北秦岭地区震旦—寒武纪岩相古地理研究新认识显示文摘前人研究多认为四川盆地北缘及秦岭地区震旦纪—寒武纪为深海斜坡或台地边缘斜坡,而在该区古地理编图过程中发现,本区碳质泥岩、石煤为地表或近岸浅水滞留环境如沼泽、澙湖的沉积产物,非深水或深海环境的沉积产物。为此,通过对川北野外剖面精细观察和实测、钻井资料深刻分析和对比,并结合地震剖面的解释和控制,对研究区进行了综合剖面相分析、剖面对比相分析及平面剖面相分析;同时参考前人有关该区的构造层序古地理、定量古地理和生产古地理编图资料,通过优化编制震旦纪—寒武纪以世或段(期)为单元的古地理图,认为四川盆地北缘秦岭地区震旦纪—寒武纪的古地理格局主要由潮坪、澙湖、泥碳沼泽、滨岸、局限台地等相带或古地理单元所构成,而非深海盆地、斜坡或台地边缘斜坡。 | 胡方杰 张殿伟 田海芹 | 2014 | 沉积学报2014，32，1： | 9 |
| 3 | 大巴山早寒武世黑色岩层稀土元素特征及沉积环境分析显示文摘为了探讨大巴山早寒武世黑色岩层的稀土元素特征及古沉积环境,采用电感耦合等离子体质谱法(ICP-MS)对大巴山城巴断块内的水井沱组黑色岩层的稀土元素及V、Ni、Cr、U、Th、Zn、Co等微量元素质量分数进行了测定,并与前人研究的鲁家坪组黑色岩层进行了对比分析。研究结果表明,城巴断块内的黑色岩层轻稀土元素相对重稀土元素富集,Ce异常值δCeN为0.47~0.94(平均值0.69),δCeS为0.46~0.91(平均值0.67)呈负异常,Eu异常值δEuN=0.27~1.03(平均值0.57),δEuS=0.42~1.57(绝大多数小于0.87),δEu基本呈现负异常;U/Th比值为2.52~67.51,Sr/Cu比值为5.83~27.96,V/(V+Ni)比值为0.65~0.98,V/Cr比值为1.35~17.79及δU值为1.77~1.99,结合REE的北美页岩标准化曲线、La-Ce图解、Zn-Ni-Co三角图解及La/Yb-REE判别图解的分析表明,大巴山城巴断块内的早寒武世黑色岩层沉积时所处的古气候为干热型气候,黑色岩层形成于被动大陆边缘的缺氧浅海陆棚-斜坡过渡带的沉积环境,且明显受到热液作用的影响。 | 凌斯祥 巫锡勇 任勇 李晓宁 王刚刚 | 2015 | 地质科技情报2015，34，5： | 6 |
| 4 | 米仓山地区早寒武世仙女洞组古地理和沉积物源分析显示文摘关于米仓山早寒武世地层的物源区母岩,长期以来持有的观点认为主要来自东北汉南古陆和(或)西北摩天岭古陆(碧口地块)。然而,仙女洞组的岩相古地理等确定的物源方向并不支持。灰色泥岩和灰色灰岩,发育水平层理,沉积环境为泻湖;灰色厚层鲕粒灰岩等(发育板状交错层理和鲕状交错层理)、沉积环境为鲕粒滩;灰色中-厚层角砾状灰岩和砾屑灰岩等,发育滑塌构造,沉积环境为碳酸盐斜坡。区域古地理指示,沿福庆-正源-大两-杨坝-桥亭一线向北东方向,沉积水体逐渐变深,古地理由泻湖、鲕粒滩逐渐过渡为碳酸盐斜坡。交错层理恢复的古潮流指示,潮流主要为西北和西南方向。重矿物组成和电子探针分析结果表明,以花岗岩和变砂岩、泥岩为主。综合分析表明,仙女洞组的物源主要来自西北碧口地块和西南康滇古陆的花岗岩、变质砂岩和变质泥岩,且经历再旋回过程。 | 张英利 贾晓彤 王宗起 王坤明 陈木银 | 2019 | 地质学报2019，93，11： | 5 |
| 5 | Sedimentology of reefal buildups of the Xiannüdong Formation(Cambrian Series 2),SW China显示文摘The reefs in the Xiannüdong Formation(Cambrian Series 2) are the oldest archaeocyathan–microbial bioconstructions in China,but the details of their microbial structures have not been previously described.However,a new section at Tangjiahe site,northern Sichuan Province,contains very well-preserved microbial fabrics that provide these details,and is described in this study.The Tangjiahe section contains three levels of reefal buildups that were constructed by a consortium of archaeocyaths and calcimicrobes in varying proportions.The lowest(oldest) reefal buildup is a calcimicrobial biostrome,possibly in the form of a wide mound with a low relief(unconfirmed due to outcrop limitation),which was formed by Epiphyton with rare small archaeocyaths,and is sandwiched by flat-pebble conglomerates.The middle reefal buildup is a high-relief calcimicrobial mound,enclosed by oolites,that was built by intergrown Renalcis and Tarthinia.Archaeocyath fossils are uncommon,and were bound into the framework by microbial carbonates.The uppermost(youngest) reefal buildup is a low-relief archaeocyathan mound lacking calcimicrobes but partly having microbially-clotted textures attached on archaeocyaths.Calcimicrobes built or aided archaeocyaths to form the framework of Tangjiahe reefs.The three buildups formed in low-energy lagoons behind ooid shoals,and the environment was nutrient-rich due to terrigenous influx from adjacent lands.Tangjiahe reefs thus resemble most Early Cambrian reefs,in settings consistent with eutrophic,calm environments,and are characterized by the domination or aid of calcimicrobial components in framework construction. | Hao Tang Stephen Kershaw Xiu-Cheng Tan Hong Liu Fei Li Cheng Shen Fei-Fan Lu Xue-Fei Yang | 2019 | Journal of Palaeogeography2019，8，2： | 3 |
| 6 | 川中—川西北加里东期古隆起对比研究显示文摘四川盆地加里东期经历了桐湾、郁南、都匀、广西等多期次构造运动,于盆地中西部和西北部分别形成了川中古隆起和川西北古隆起。重建加里东期川中古隆起和川西北古隆起形成演化过程及其关联性可以为四川盆地中西部和西北部深层海相层系下一步油气勘探部署提供新思路。本文通过对四川盆地已有钻井和地震资料的分析,开展了不同构造区的震旦系—早古生代地层对比分析,识别出四川盆地加里东期古隆起各套地层尖灭点分布范围、不整合削截点和上超点。利用地震、连井剖面相结合的方法,重塑了川中和川西北地区古隆起的形成演化过程。综合研究认为,加里东期古隆起的构造形态在晚奥陶世—早志留世初步形成,在晚志留世广西运动中经历了细微调整,古隆起在早志留世达到最大展布范围,于二叠纪沉积前定型,郁南运动和都匀运动对加里东期古隆起的变形起着重要作用;二者总体经历了“隆-凹”分异阶段(Z—∈_(1)m)、隆起定型阶段(∈_(1)q—S_(1))、联合隆升阶段(S_(2)—C)、稳定埋藏阶段(P—T_(2))等4个阶段。 | 陈涛 李智武 李金玺 童馗 王自剑 蔡鸿燕 袁梦雨 | 2023 | 沉积与特提斯地质2023，43，4： | 1 |
| 7 | Impact of pyrite on shale gas enrichment——a case study of the Lower Silurian Longmaxi Formation in southeast Sichuan Basin显示文摘Pyrite is one of the important components of shale and plays a crucial role in shale gas enrichment.However,currently there are just a few studies on this subject matter.Therefore,the characteristics of pyrite in organic-rich shale section of the Longmaxi Formation and its impact on shale gas enrichment was studied in this paper by using outcrops,drilling cores,thin sections and test data.Result shows that pyrite occurred in different forms(macro-micro scale)in the Longmaxi Formation in the southeast Sichuan Basin.The formation and content of pyrite has a close relation with TOC content.Pyrite may catalyze the hydrocarbon generation of organic matter.Interparticle pores within the pyrite framboids and organic matter pores in the pyrite-organic matter complex are welldeveloped in the Longmaxi Shale,which serves as a major reservoir space for shale gas.Pyrite can promote shale gas enrichment by absorbing shale gas on its surface and preserving free gas in the interparticle pores and organic matter pores.In addition,as a kind of brittle mineral,pyrite can improve the brittleness of shale reservoir and increase the micro-nano pore system in shale reservoir,thereby improving the transmission performance of shale reservoir and boosting shale gas recovery. | Xin CHEN Lei CHEN Xiucheng TAN Shu JIANG Chao WANG | 2021 | Frontiers of Earth Science2021，15，2： | 0 |
| 8 | The sedimentary facies characteristics and lithofacies palaeogeography during Middle-Late Cambrian,Sichuan Basin and adjacent area显示文摘Combined with the regional strata filling characteristics of Middle-Upper Cambrian,the present paper conducts a systematic research on sedimentary facies in the basin and its peripheral area by utilizing 164 field outcrops and drilling and coring data.Further,the method of“multi-factor comprehensive synthesis based on single-factor analysis”was employed to investigate the sedimentary facies and palaeogeography of the study area and establish the sedimentary facies model.Stratigraphic reveals that the study area represents the pattern of thin-northwest and thicksoutheast by stretching northeast-southwest.Within the present basin,the pattern of“one thin and two thick”predominates,while outside the basin“four thin and three thick”filling feature was found.Sedimentary facies shows that the study area was featured by rimmed carbonate platform.Specifically,carbonate platform,slope and northeastern corner Qinling paleooceanic Basin and southeastern corner Jiangnan Bain was identified from the west to the east.The carbonate platform contains restricted platform,evaporation-restricted platform,semi-restricted platform and the platform margin.Single factor analysis and lithofacies palaeogeographic characteristics manifests that during Middle-Late Cambrian,the western Old land evolved into peneplain stage,and that the eastern and southwestern sub-sags remained connected to the open-sea to some extent.At the time,the shllow seawater circulation was relatively restricted,while the ancient seabed tended to be flat and evaporation characteristics significantly diminished.Secondary sea-level fluctuation intensively influenced the development of scaled grain beach.It is suggested that tide marginal beach,intraplatform shoal subfacies zone,along with Shiqian-SangZhi in southeast and Zhenba-Xinshan in northeast platform-margin beach subfacies zone to be preferable targets for the favorable reservoir facies zone and potential oil and gas reservoir area. | Feifan Lu Xiucheng Tan Teng Ma Ling Li Aiwei Zhao Chengpeng Su Jingqing Wu Haitao Hong | 2017 | Petroleum2017，3，2： | 0 |
| 9 | 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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