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Paleomagnetic dating of the Cenjiawan Paleolithic site in the nihewan Basin, northern China

Science China Earth Sciences 2006年第3期49卷 295-303页

作者： WANG Hongqiang1,2, DENG Chenglong1, ZHU Rixiang1 & XIE Fei3 1. Paleomagnetism and Geochronology Laboratory (SKL-LE), Institute of Geology and Geophysics, Chinese Academy of Sci- ences, Beijing 100029, China 2. School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China 3. Hebei Province Institute of Cultural Relics, Shijiazhuang 050000, China 1. Paleomagnetism and Geochronology Laboratory (SKL-LE) Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China 2. School of the Earth Sciences and Resources China University of Geosciences Beijing 100083 China 3. Hebei Province Institute of Cultural Relics Shijiazhuang 050000 China

Rock magnetic and magnetostratigraphic investigations on a lacustrine sequence in the nihewan Basin, northern China, which bears the Cenjiawan Paleolithic site, indicate that the dominant magnetic mineral and remanence carrier contained in the sediments is magnetite. While hematite co-exists with magnetite in some portions of the Cenjiawan sequence, where characteristic remanent magnetizations are carried by both magnetite and hematite. Measurements of anisotropy of magnetic susceptibility confirm that the Cenjiawan sequence has preserved the original sedimentary features and is suitable for magnetostratigraphic study. Paleomagnetic results indicate that the Cenjiawan Paleolithic site is formed just posterior to the Punaruu normal event, which is dated at about 1.1 Ma. Combined with the paleomagnetic results of the Donggutuo, Xiaochangliang and Majuangou sections, it is concluded that early humans were occupying the nihewan Basin around 1.6, 1.3 and 1.1 Ma. This integrated result is significant to understanding the ability of migration and adaptation to the envi- ronment of early humans.

关键词： nihewan Basin, Early Pleistocene, Cenjiawan, Paleolithic site, paleomagnetism.

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Soluble salt deposit in the nihewan beds and its environmental significance

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Science China Earth Sciences 2000年第5期43卷 464-479页

作者：李容全乔建国邱维理翟秋敏李永良 Department of Resources and Environmental Science Beijing Normal University Beijing 100875 China Dean's Office of Shanxi Normal University Linfen 041004 China The Center for Analyses and Tests Beijing Normal University Beijing 100875 China

Observation and experimental analysis of soluble salt deposit along four profiles across the strata deposited in nihewan paleolake basin enabled us to recognize the nature and evolution stages of the nihewan paleolake and its significance in stratigraphical division and pa-leo-environmental reconstruction. The nihewan paleolake was at least a weak-saline to semi-saline lake and represents an intracontinental lake in the semi-arid region. The lower member of sedimentary strata in the paleolake contains gypsum layer and gypsum lamellae. Soluble salt is mainly composed of SO42- and Ca2+ ions, representing a trend of the paleolake evolvinginto a stage of sulfate lake. The upper member of the strata has predominantly Cl-, K+, and Na+ ions in soluble salt, indicating a starting development of the paleolake to chlorite lake, but no salt rock was deposited, indicating a drying trend of the area.

关键词： nihewan beds soluble salt deposit paleo-environment semi-saline lake.

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Stromatolites Discovered in nihewan Formation and Their Paleoenvironment

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Science China Chemistry 1994年第5期37卷 634-640页

作者：夏正楷张昀杨德军陈铁梅杨全胡艳秋 Department of Geography Peking University Beijing 100871 PRC Department of Geology Peking University Beijing 100871 PRC Chronological Laboratory Peking University Beijing 100871 PRC

Columnar stromatolites have been discovered in two beds of the upper part of the nihewan Formation, a series of lacustrine deposits. The structure of the stromatolites is characterized by alternation of light, intergranular pore-rich laminae and dark, organic substance-rich laminae. Abundant filamentous algal remains have been discovered in stromatolite laminae, some of them are similar to the species present on the shore of the Caribbean Sea that are living in warmer climate than in the nihewan area now. With the ESR and U-series age methods, it has been determined that the ages of the lower and upper stromatolite beds are about 130,000 and 93,000 a B. P. , respectively. Compared with many other geologic events taking place during the period in Northern China, we conclude that the two stromatolite beds were formed during the two warmer stages of the Last Interglacial.

关键词： nihewan Fm. stromatolite filamentous algal.

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Sr isotope of fossil foraminiferal assemblages in the nihewan Group

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Chinese Science Bulletin 1996年第7期41卷 583-586页

作者：王世杰董利敏林文祝李春来汪品先赵泉鸿吴锡浩 Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China Laboratory of Marine Geology Tongji University Shanghai 200092 China. Institute of Geomechanics Ministry of Geology and Mineral Resources Beijing 100081 China

Debate on depositional environment about foraminifera-rich strata in many Cenozoiccontinental basins in East China has existed for a long time. Research results achieved inrecent years show that it is difficult to distinguish foraminiferal assemblages in modern saltylakes from those in weakly marine environments such as supratidal zone and ***, shell geochemistry may be an outlet for this problem because of great differencein chemical and isotopic compositions between lake water and sea water. So fossils ofNonion shansiensis (Evolutononion shangiensis N. Wang), which is a sole foraminiferal speciespreserved in upper part of bed 27 and bed 28 in Xiaodukou section in the Nihewen Ba-sin, were selected for Sr isotopic measuremnts. The sequence is larger than 12 m in

关键词： foraminifera Sr isotope continental facies nihewan Group.

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New fossils of the Early Pleistocene Equus huanghoensis(Equidae,Perissodactyla)from nihewan in Hebei Province of China

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Science China Earth Sciences 2016年第10期59卷 83-94页

作者： LI YongXiang ZHANG YunXiang SUN BoYang AO Hong XUE XiangXu State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi'an 710069China State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of SciencesXi'an 710061China Tianjin Museum of Natural History Tianjin 300201China

This paper describes new fossils of Equus huanghoensis from an Early Pleistocene bed in nihewan, Hebei Province, which confirms the classification of E. huanghoensis by Chinese researchers. The new fossils include a relatively complete male skull and mandible with all upper and lower dentition, a broken female skull with fragment of mandible and a broken Mc III of Equus sp. The fossils were collected from the Yangshuizhan site of nihewan. The age of the formation is about 1.6 Ma. The new materials verify some classification characteristics based on teeth published in previous descriptions. These characteristics include large teeth size, short protocone, and tilted protoloph and metaloph. We have added to these characteristics of large skull size, a developed protuberantia supramagna, pentagonal nuchal side, weak Pli cabaline, simple enamel plications; a series of new characteristics strikingly different from the other Equus horses. The broken Mc III is similar to Equus qingyangensis from Qingyang, Gansu.

关键词： nihewan Early Pleistocene Equus huanghoensis New fossils

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