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Sedimentary filling and sequence structure dominated by T-R cycles of the nenjiang formation in the Songliao Basin

Science China Earth Sciences 2014年第12期57卷 278-296页

作者： ZHANG ChenChen ZHANG Shun WEI Wei WU ChaoDong LIANG JiangPing NIU Wen DU JinXia FU XiuLi CUI KunNing WANG Chao WANG Hui School of Earth and Space Science Peking University Research Institute of Petroleum Exploration and Development PetroChina Daqing Oil Field Company

The nenjiang formation in the Songliao Basin is a symmetrical sequence of progradation-retrogradation,and is formed in the transgression cycle and regression cycle(T-R cycles)of the base level of *** analyzed the drilling,well logging,core data,and seismic profiles of basin level,and by using the sequence stratigraphy,identified one secondary sequence boundary,two third-order sequence boundaries,and eight fourth-order sequence boundaries in the nenjiang *** eleven sequence boundaries can be divided into structural unconformity,depositional unconformity,flooding surface,and forced regression *** the nenjiang formation can be subdivided into one secondary sequence,three third-order sequences,and ten fourth-order *** have restored the sedimentary filling evolution within the stratigraphic framework of fourth-order sequences in the nenjiang *** sedimentary period of the first member of the nenjiang formation was corresponded to the global transgression period,which is also the development period of transgression cycle(T cycle),when the lake basin had the largest scope and deepest sedimentary water,the SB07(the maximum flooding surface)was formed on the top of strata during this period;covering above the SB07,there developed a set of condensation layer-oil shale,which is distributed in the whole basin and is the important source bed and regional ***,a retrogradation sequence was formed in the T cycle of the first member of the nenjiang formation,characterized by the retrograding delta at a low *** delta has a giant front,a small plain,and many underwater distributary ***,large gravity flow channels and sublacustrine fans are developed in the front of the *** the depositional period of the second member of the nenjiang formation,the R cycle began to develop due to the compression of the pacific tectonic domain;the source direction rotated 90°along with the eastern uplifting of

关键词： transgressive-regressive cycles sedimentary evolution dynamic mechanism Songliao Basin nenjiang formation

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Clay mineralogy of the first and second members of the nenjiang formation, Songliao Basin: Implications for paleoenvironment in the Late Cretaceous

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Science China Earth Sciences 2018年第3期61卷 327-338页

作者： GAO Yuan XI DangPeng QIN ZuoHuan MA PengFei WANG ChengShan State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences School of Earth Sciences and Resources China University of Geosciences State Key Laboratory of Marine Geology Tongji University

The first and second members ofthe nenjiang formation （K2n1＋2） in the Songliao Basin, northeast China, are an interval of dark-colored mudstone. Paleoenvironmental studies of these strata are useful for understanding the terrestrial environment under a greenhouse climate and hydrocarbon accumulation in lake basins. In this study, clay mineralogy of the K2n1＋2 from four borehole or outcrop sections is investigated to understand terrestrial paleoenvironment during the depositional period in the Late Cretaceous. In the mudstone samples, smectite and illite are the predominant clay minerals, and were derived from weathering of parent rocks in a temperate, sub-humid to sub-arid climate; kaolinite and chlorite are minor clay species. The difference in the clay-mineral assemblages between the eastern and western margins of the basin was primarily controlled by provenance lithology, and the high smectite content in the western basin resulted from alteration of volcanic rocks exposed in the Greater Xing＇an Range area. The increasing illite content and ratio of illite/smectite percentages in the upper part of the first member of the nenjiang formation indicate paleoenvironmental change. This temporal change in the clay-mineral composition was primarily caused by a regionally cooler and drier paleoclimate, consistent with previous paleoenviroumental reconstructions.

关键词： Clay mineral nenjiang formation Songliao Basin Paleoenvironment Late Cretaceous

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The first occurrence of Scincomorpha lizard from nenjiang formation(lower Campanian)of Jilin,Northeast China

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Global Geology 2022年第4期25卷 255-263页

作者： YANG Jinyue WU Wenhao YU Kaifeng SONG Qingqing College of Earth Sciences Jilin UniversityChangchun 130061China Research Centre of Palaeontology and Stratigraphy College of Earth SciencesJilin UniversityChangchun 130026China Xinjiang Branch Survey and Design Institute of Jiangxi ProvinceUrumqi 830000China

Fossil lizards are scarce in Jinlin Province,with only two jaws of Middle Eocene *** the authors report the first scincomorph lizard materials from the early Campanian nenjiang formation in Nong’an,Changchun,Jilin *** tooth morphologies of scincomorph lizards represented by fragmentary dentaries are tentatively identified as *** morphology of the crowns indicates probably the insectivorous and omnivorous diets of these small *** is the first lizard fossils discovered in the Late Cretaceous of Northeast China,extends the known paleogeographic distribution of scincomorph lizards,and provides new information about the terrestrial vertebrate fauna of the Cretaceous Songliao Basin.

关键词： Songliao Basin nenjiang formation Scincomorpha lower Campanian

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Exploring the first occurrence of Scincomorpha lizard from nenjiang formation(lower Campanian)of Jilin,Northeast China:a follow-up study

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Global Geology 2023年第4期26卷 199-210页

作者： MUHAMMAD Hassan WU Wenhao YANG Jinyue College of Earth Sciences Jilin UniversityChangchun 130061China Research Centre of Palaeontology and Stratigraphy College of Earth SciencesJilin UniversityChangchun 130026China Key Laboratory of Stratigraphy and Palaeontology Ministry of Natural ResourcesBeijing 100037China Core and Sample Center of Natural Resources China Geological SurveySanhe 065201HebeiChina

In a region where lizard fossils are rare,this study explores a groundbreaking discovery of squamate lizard materials from the upper part of nenjiang formation(early Campanian)in Jilin Province,Northeast *** the fragmentary nature of the dentaries,they exhibit distinct tooth morphological characteristics of squamate lizards,suggesting insectivorous and omnivorous diets for these small *** finding not only represents a significant addition to the squamate lizard fossil records from the Late Cre-taceous in Northeast China but also contributes to our understanding of the paleogeographic distribution of squamate ***,it sheds new light on the terrestrial vertebrate fauna of the Cretaceous Songliao Basin.

关键词： squamates Late Cretaceous nenjiang formation Songliao Basin

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